User manual | american_marsh_hd_lh

Installation, Operation &
Maintenance Manual
For
Series 340
Horizontal Split Case Pumps
*077-0209-000*
077-0209-000
Copyright © 2013 American-Marsh Pumps
Water Systems Group
Engineered Process Group
www.american-marsh.com
Series 340
Model: Horizontal Splitcase
Edition 2
25 September 2013
IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
Installation, Operation & Maintenance Manual
Table of Contents
4 ...............SAFETY CONSIDERATIONS
5 ...............PUMP IDENTIFICATION
5...............MANUFACTURER
5...............TYPE OF PUMP
5...............DATE OF MANUFACTURE
5...............INSTALLATION, OPERATION & MAINTENANCE MANUAL IDENTIFICATION
5 ............... WARRANTY
5 ...............GENERAL INSTRUCTIONS
6 ...............HANDLING AND TRANSPORT
6...............METHOD OF TRANSPORT
6...............STORAGE
7 ...............INSTALLATION & ALIGNMENT
7...............FACTORY PRELIMINARY ALIGNMENT PROCEDURE
7...............RECOMMENDED PROCEDURE FOR BASE PLATE INSTALLATION & FINAL
FIELD ALIGNMENT
9...............PIPING CONNECTION – SUCTION & DISCHARGE
10...............SUCTION PIPING
11...............DISCHARGE PIPING
12...............PUMP AND SHAFT ALIGNMENT CHECK
12...............MECHANICAL SEAL
12...............PACKING
12...............PIPING CONNECTION –SEAL/PACKING SUPPORT SYSTEM
12...............BEARING LUBRICATION
13...............COUPLING
13 ...............PUMP OPERATION
13...............ROTATION CHECK
14...............PRE START-UP CHECKS
14...............PRIMING
14...............ENSURING PROPER NPSHA
14...............MINIMUM FLOW
15...............STARTING THE PUMP AND ADJUSTING FLOW
15...............OPERATION IN SUB-FREEZING CONDITIONS
15...............SHUTDOWN CONSIDERATIONS
16 ...............TROUBLESHOOTING
21 ...............MAINTENANCE
21...............PREVENTIVE MAINTENANCE
21...............NEED FOR MAINTENANCE RECORDS
21...............NEED FOR CLEANLINESS
21...............MAINTENANCE OF PUMP DUE TO FLOOD DAMAGE
21...............DISASSEMBLY
23...............RE-ASSEMBLY
29 ............... APPENDIX A
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IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
Installation, Operation & Maintenance Manual
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IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
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Installation, Operation & Maintenance Manual
SAFETY CONSIDERATIONS
leave liquid in the booster system. Drain the system completely.
During winter months and cold weather, the liquid could freeze
and damage the system components.
The American-Marsh 340 Series Horizontal Splitcase pumps
have been designed and manufactured for safe operation. In
order to ensure safe operation, it is very important that this
manual be read in its entirety prior to installing or operating
the system. American-Marsh Pumps shall not be liable for
physical injury, damage or delays caused by a failure to observe
the instructions for installation, operation and maintenance
contained in this manual.
Do not run the equipment dry or start the pump without the
proper prime (flooded system).
Never operate the pump(s) for more than a short interval with
the discharge valve closed. The length of the interval depends
on several factors including the nature of the fluid pumped and
its temperature. Contact American-Marsh Engineering for additional support if required.
Remember that every pump has the potential to be dangerous,
because of the following factors:
Never operate the system with a closed suction valve.
• Parts are rotating at high speeds
• High pressures may be present
• High temperatures may be present
• Highly corrosive and/or toxic chemicals may be present
Excessive pump noise or vibration may indicate a dangerous operating condition. The pump(s) must be shutdown immediately.
Do not operate the pump and/or the system for an extended
period of time below the recommended minimum flow.
Paying constant attention to safety is always extremely important. However, there are often situations that require special
attention. These situations are indicated throughout this book
by the following symbols:
It is absolutely essential that the rotation of the motor be
checked before starting any pump in the system. Incorrect rotation of the pump(s) for even a short period of time can cause
severe damage to the pumping assembly.
If the liquid is hazardous, take all necessary precautions to avoid
damage and injury before emptying the pump casing.
Residual liquid may be found in the pump casing, suction and
discharge manifolds. Take the necessary precautions if the liquid is hazardous, flammable, corrosive, poisonous, infected, etc.
DANGER - Immediate hazards which WILL result in severe
personal injury or death.
Always lockout power to the driver before performing pump
maintenance.
Never operate the pump without the coupling guard (if supplied) and all other safety devices correctly installed.
Do not apply heat to disassemble the pump or to remove the
impeller. Entrapped liquid could cause an explosion.
WARNING – Hazards or unsafe practices which COULD result
in severe personal injury or death.
If any external leaks are found while pumping hazardous product, immediately stop operations and repair.
CAUTION – Hazards or unsafe practices which COULD result
in minor personal injury or product or property damage.
Maximum Lifting Speed: 15 feet/second.
If in a climate where the fluid in the system could freeze, never
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IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
Installation, Operation & Maintenance Manual
PUMP IDENTIFICATION
WARRANTY
American-Marsh Pumps guarantees that only high quality
materials are used in the construction of our pumps and that
machining and assembly are carried out to high standards.
MANUFACTURER
American-Marsh Pumps
185 Progress Road
Collierville, TN 38017
The pumps are guaranteed against defective materials and/or
faulty craftsmanship for a period of one year from the date of
shipment unless specifically stated otherwise.
United States of America
Replacement of parts or of the pump itself can only be carried
out after careful examination of the pump by qualified personnel.
TYPE OF PUMP
The American-Marsh HD split case pump is a horizontal,
double suction, single stage, axially split centrifugal pump.
The warranty is not valid if third parties have tampered with the
pump.
DATE OF MANUFACTURE
This warranty does not cover parts subject to deterioration or
wear and tear (mechanical seals, pressure and vacuum gauges,
rubber or plastic items, bearings, etc.) or damage caused by
misuse or improper handling of the pump by the end user.
The date of manufacture is indicated on the pump data plate.
INSTALLATION, OPERATION &
MAINTENANCE MANUAL IDENTIFICATION
Prepared: September 25, 2013
Revision: Parts replaced under warranty become the property of American-Marsh Pumps.
Contact the American-Marsh Pumps’ factory:
Edition: 02
Date of Revision:
American-Marsh Pumps
185 Progress Road
Collierville, TN 38017
United States Of America
NAMEPLATE INFORMATION
Phone:
(901) 860-2300
Fax:
(901) 860-2323
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GENERAL INSTRUCTIONS
The pump and motor unit must be examined upon arrival to
ascertain any damage caused during shipment. If damaged
immediately notify the carrier and/or the sender. Check that
the goods correspond exactly to the description on the shipping
documents and report any differences as soon as possible to the
sender. Always quote the pump type and serial number stamped
on the data plate.
FIGURE 1 – Pump Data Plate
SERIAL NUMBER
: Serial Number of pump unit (issued by Production Control)
SIZE
: Size designation of pump (4x6-10)
TYPE
: Pump type (HD)
RPM
: Speed of pump
GPM
: Rated capacity of pump
TDH
: Rated Total Dynamic Head of pump
IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
The pumps must be used only for applications for which the
manufacturers have specified:
• The construction materials
• The operating conditions (flow, pressure, temperature, etc.)
• The field of application
In case of doubt, contact the manufacturer.
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Installation, Operation & Maintenance Manual
HANDLING AND TRANSPORT
installation.
STORAGE
METHOD OF TRANSPORT
The pump must be transported in the horizontal position
SHORT-TERM STORAGE
Normal packaging is designed to protect the pump during shipment and for dry, indoor storage for up to two months or less.
The procedure followed for this short-term storage is summarized below:
INSTALLATION
During installation and maintenance, all components must
be handled and transported securely by using suitable slings.
Handling must be carried out by specialized personnel to avoid
damage to the pump and persons. The lifting rings attached to
various components should be used exclusively to lift the components for which they have been supplied.
Standard Protection for Shipment :
a. Loose unmounted items, including, but not limited to, oilers, packing, coupling spacers, stilts, and mechanical seals are packaged in a water proof plastic bag and
placed under the coupling guard. Larger items are cartoned and metal banded to the base plate. For pumps
not mounted on a base plate, the bag and/or carton is
placed inside the shipping carton. All parts bags and
cartons are identified with the American-Marsh sales
order number, the customer purchase order number,
and the pump item number (if applicable).
Maximum lifting speed: 15 feet/second
It is important to exercise extreme care in handling and installing all parts. Certain items are precision machined for proper
alignment and, if dropped, banged, sprung, or mistreated in any
way, misalignment and malfunction will result. Other components, such as the electrical cable, may be vulnerable to gouging or scuffing. Parts which are too heavy to be lifted from the
transporting car or truck should be skidded slowly and carefully
to the ground to prevent damage. Never unload by dropping
parts directly from the carrier to the ground and never use shipping crates for skids.
b. Inner surfaces of the bearing housing, shaft (area
through bearing housing), and bearings are coated with
Cortec VCI-329 rust inhibitor, or equal.
Note: Bearing housings are not filled with oil prior to
shipment.
c. Regreasable bearings are packed with grease (Royal
Purple NLGI#2).
d. After a performance test, if required, the pump is
tipped on the suction flange for drainage (some residual water may remain in the casing). Then, internal
surfaces of ferrous casings, covers, flange faces, and the
impeller surface are sprayed with Calgon Vestal Labs
RP-743m, or equal. Exposed shafts are taped with
Polywrap.
If job site conditions permit, you may be able to install directly
from the truck that delivered the pump. If not, move the components to the installation area and lay them out in a clean and
protected space convenient to the work location. Column pipe
sections should be placed on suitable timbers to keep them out
of the dirt, arranged so that the coupling ends point toward the
wellhead. The bowl/motor assembly should be left on the skids
until lifted for installation. The power cable and motor leads
must receive special protection to avoid damage to jacket or
insulation.
e. Flange faces are protected with plastic covers secured with plastic drive bolts. 3/16 in (7.8 mm) steel or
1/4 in (6.3 mm) wood covers with rubber gaskets, steel
bolts, and nuts are available at extra cost.
If installation cannot begin within a few days after delivery,
segregate and identify all components of the shipment so they
won’t be confused with other equipment arriving at the job site.
f. All assemblies are bolted to a wood skid which confines the assembly within the perimeter of the skid.
Read and follow the storage instructions carefully because care
of the pump during this period before installation can be as
important as maintenance after operation has begun.
Check all parts against the packing list to make sure nothing
is missing. It is much better to find out now than during the
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g. Assemblies with special paint are protected with a
plastic wrap.
h. Bare pumps, when not mounted on base plates, are
bolted to wood skids.
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IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
Installation, Operation & Maintenance Manual
i. All assemblies having external piping (seal flush and
cooling water plans), etc. are packaged and braced to
withstand normal handling during shipment. In some
cases components may be disassembled for shipment.
The pump must be stored in a covered, dry location.
the base sitting in an unrestrained condition on a flat and level
surface. This standard also emphasizes the need to ensure the
shaft spacing is adequate to accept the specified coupling spacer.
The factory alignment procedure is summarized below:
1. The base plate is placed on a flat and level work
bench in a free and unstressed position.
LONG-TERM STORAGE
2. The base plate is leveled as necessary. Leveling is
accomplished by placing shims under the rails (or, feet)
of the base at the appropriate anchor bolt hole locations. Levelness is checked in both the longitudinal
and lateral directions.
Long-term storage is defined as more than two months, but less
than 12 months. The procedure American-Marsh follows for
long-term storage of pumps is given below. These procedures
are in addition to the short-term procedure.
Solid wood skids are utilized. Holes are drilled in the skid to
accommodate the anchor bolt holes in the base plate, or the casing and bearing housing feet holes on assemblies less base plate.
Tackwrap sheeting is then placed on top of the skid and the
pump assembly is placed on top of the Tackwrap. Metal bolts
with washers and rubber bushings are inserted through the skid,
the Tackwrap, and the assembly from the bottom of the skid and
are then secured with hex nuts. When the nuts are “snugged”
down to the top of the base plate or casing and bearing housing feet, the rubber bushing is expanded, sealing the hole from
the atmosphere. Desiccant bags are placed on the Tackwrap.
The Tackwrap is drawn up around the assembly and hermetically (heat) sealed across the top. The assembly is completely
sealed from the atmosphere and the desiccant will absorb any
entrapped moisture. A solid wood box is then used to cover the
assembly to provide protection from the elements and handling.
This packaging will provide protection up to twelve months
without damage to mechanical seals, bearings, lip seals, etc. due
to humidity, salt laden air, dust, etc. After unpacking, protection will be the responsibility of the user. Addition of oil to the
bearing housing will remove the inhibitor. If units are to be idle
for extended periods after addition of lubricants, inhibitor oils
and greases should be used.
3. The motor and appropriate motor mounting
hardware is placed on the base plate and the motor is
checked for any planar soft-foot condition. If any is
present it is eliminated by shimming.
4. The motor feet holes are centered around the motor
mounting fasteners.
5. The motor is fastened in place by tightening the nuts
on two diagonal motor mounting studs.
6. The pump is put onto the base plate and leveled.
If an adjustment is necessary, we add or delete shims
between the pump foot and the base plate.
7. The spacer coupling gap is verified.
8. The parallel and angular vertical alignment is made
by shimming under the motor.
9. All four motor feet are tightened down.
10. The pump and motor shafts are then aligned horizontally, both parallel and angular, by moving the pump
to the fixed motor. The pump feet are tightened down.
Every three months, the shaft should be rotated approximately
10 revolutions.
11. Both horizontal and vertical alignment are again
final checked as is the coupling spacer gap.
INSTALLATION & ALIGNMENT
FACTORY PRELIMINARY ALIGNMENT PROCEDURE
The purpose of factory alignment is to ensure that the user
will have full utilization of the clearance in the motor holes for
final job-site alignment. To achieve this, the factory alignment
procedure specifies that the pump be aligned in the horizontal
plane to the motor, with the motor foot bolts centered in the
motor holes. This procedure ensures that there is sufficient
clearance in the motor holes for the customer to field align the
motor to the pump, to zero tolerance. This philosophy requires
that the customer be able to place the base in the same condition as the factory. Thus the factory alignment will be done with
IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
RECOMMENDED PROCEDURE
FOR BASE PLATE INSTALLATION
& FINAL FIELD ALIGNMENT
NEW GROUTED BASE PLATES
7
1. The pump foundation should be located as close to
the source of the fluid to be pumped as practical. There
should be adequate space for workers to install, operate, and maintain the pump. The foundation should be
sufficient to absorb any vibration and should provide a
rigid support for the pump and motor. Recommended
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Installation, Operation & Maintenance Manual
mass of a concrete foundation should be three times
that of the pump, motor and base. Note that foundation bolts are imbedded in the concrete inside a sleeve
to allow some movement of the bolt.
3. After leveling the base plate, tighten the anchor
bolts. If shims were used, make sure that the base plate
was shimmed near each anchor bolt before tightening.
Failure to do this may result in a twist of the base plate,
which could make it impossible to obtain final alignment. Check the level of the base plate to make sure
that tightening the anchor bolts did not disturb the
level of the base plate. If the anchor bolts did change
the level, adjust the jackscrews or shims as needed to
level the base plate. Continue adjusting the jackscrews
or shims and tightening the anchor bolts until the base
plate is level.
2. Level the pump base plate assembly. If the base
plate has machined coplanar mounting surfaces, these
machined surfaces are to be referenced when leveling
the base plate. This may require that the pump and
motor be removed from the base plate in order to reference the machined faces. If the base plate is without
machined coplanar mounting surfaces, the pump and
motor are to be left on the base plate. The proper
surfaces to reference when leveling the pump base plate
assembly are the pump suction and discharge flanges.
DO NOT stress the base plate. Do not bolt the suction or discharge flanges of the pump to the piping
until the base plate foundation is completely installed.
If equipped, use leveling jackscrews to level the base
plate. If jackscrews are not provided, shims and wedges
should be used. See Figure 2. Check for levelness in
both the longitudinal and lateral directions. Shims
should be placed at all base anchor bolt locations, and
in the middle edge of the base if the base is more than
five feet long. Do not rely on the bottom of the base
plate to be flat. Standard base plate bottoms are not
machined, and it is not likely that the field mounting
surface is flat.
4. Check initial alignment. If the pump and motor
were removed from the base plate proceed with step 5
first, then the pump and motor should be reinstalled
onto the base plate using American-Marsh’s Factory
Preliminary Alignment Procedure, and then continue
with the following. As described above, pumps are given a preliminary alignment at the factory. This preliminary alignment is done in a way that ensures that, if the
installer duplicates the factory conditions, there will
be sufficient clearance between the motor hold down
bolts and motor foot holes to move the motor into
final alignment. If the pump and motor were properly
reinstalled to the base plate or if they were not removed
from the base plate and there has been no transit damage, and also if the above steps where done properly, the
pump and driver should be within 0.015 in (0.38 mm)
FIM (Full Indicator Movement) parallel, and 0.0025
in/in (0.0025 mm/mm) FIM angular. If this is not the
case first check to see if the driver mounting fasteners
are centered in the driver feet holes. If not, re-center
the fasteners and perform a preliminary alignment to
the above tolerances by shimming under the motor
for vertical alignment, and by moving the pump for
horizontal alignment.
LEVELING WEDGES
OR SHIM LEFT IN PLACE
3/4” TO 1-1/2”
ALLOWANCE
FOR GROUT
FINISH GROUTING
GROUT
1/4”
5. Grout the base plate. A non-shrinking grout should
be used. Grout compensates for uneven foundation,
distributes weight of unit, and prevents shifting. Use
an approved, non-shrinking grout, after setting and
leveling unit.
PIPE SLEEVE
DAM
a. Build strong form around the foundation to contain grout.
WASHER
b. Soak top of concrete foundation thoroughly, then
remove surface water.
LUG
c. Under pedestal should be completely filled with
grout.
TOP OF FOUNDATION LEFT
ROUGH - CLEAN AND WET DOWN
d. After the grout has thoroughly hardened, check
the foundation bolts and tighten if necessary.
FIGURE 2 – Base Plate Foundation
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IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
Installation, Operation & Maintenance Manual
e. Approximately 14 days after the grout has been
poured or when the grout has thoroughly dried, apply an oil base paint to the exposed edges of the grout
to prevent air and moisture from coming in contact
with the grout.
All piping must be independently supported, accurately aligned
and preferably connected to the pump by a short length of flexible piping. The pump should not have to support the weight of
the pipe or compensate for misalignment. It should be possible
to install suction and discharge bolts through mating flanges
without pulling or prying either of the flanges. All piping must
be tight. Pumps may air-bind if air is allowed to leak into the
piping. If the pump flange(s) have tapped holes, select flange
fasteners with thread engagement at least equal to the fastener
diameter but that do not bottom out in the tapped holes before
the joint is tight.
Make sure that the grout fills the area under the base
plate. After the grout has cured, check for voids and
repair them.
6. Run piping to the suction and discharge of the
pump. There should be no piping loads transmitted to
the pump after connection is made. Recheck the alignment to verify that there are no significant loads.
PIPING CONNECTION – SUCTION
& DISCHARGE
7. Perform final alignment. Check for soft-foot under
the driver. An indicator placed on the coupling, reading in the vertical direction, should not indicate more
than 0.002 in (0.05 mm) movement when any driver
fastener is loosened. Align the driver first in the vertical direction by shimming underneath its feet. When
satisfactory alignment is obtained the number of shims
in the pack should be minimized. It is recommended
that no more than five shims be used under any foot.
Final horizontal alignment is made by moving the
driver. Maximum pump reliability is obtained by having near perfect alignment. American-Marsh recommends no more than 0.002 in (0.05mm) parallel, and
0.0005 in/in (0.0005 mm/mm) angular misalignment.
When installing the pump piping, be sure to observe the following precautions:
Piping should always be run to the pump.
Do not move pump to pipe. This could make final alignment
impossible.
Both the suction and discharge piping should be supported
independently near the pump and properly aligned, so that
no strain is transmitted to the pump when the flange bolts are
tightened. Use pipe hangers or other supports at necessary
intervals to provide support. When expansion joints are used
in the piping system, they must be installed beyond the piping
supports closest to the pump. Tie bolts should be used with expansion joints to prevent pipe strain. Do not install expansion
joints next to the pump or in any way that would cause a strain
on the pump resulting from system pressure changes. It is usually advisable to increase the size of both suction and discharge
pipes at the pump connections to decrease the loss of head from
friction.
8. Operate the pump for at least an hour or until it
reaches final operating temperature. Shut the pump
down and recheck alignment while the pump is hot.
Piping thermal expansion may change the alignment.
Realign pump as necessary.
EXISTING GROUTED BASE PLATES
When a pump is being installed on an existing grouted base
plate, the procedure is somewhat different from the previous
section “New Grouted Base Plates.”
1. Mount the pump on the existing base plate.
Piping Forces: Take care during installation and operation to minimize pipe forces and/or moments on the pump casing.
2. Level the pump by putting a level on the discharge
flange. If not level, add or delete shims between the
pump foot and the base plate.
Install piping as straight as possible, avoiding unnecessary
bends. Where necessary, use 45-degree or long sweep 90-degree
fitting to decrease friction losses.
3. Check initial alignment. (Step 4 above)
Make sure that all piping joints are air-tight.
4. Run piping to the suction and discharge flanges of
the pump. (Step 6 above)
Where flanged joints are used, assure that inside diameters
match properly.
5. Perform final alignment. (Step 7 above)
6. Recheck alignment after pump is hot. (Step 8 above)
IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
9
Remove burrs and sharp edges when making up joints.
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Installation, Operation & Maintenance Manual
Do not “spring” piping when making any connections.
CHECK VALVE
GATE VALVE
INCREASER
SUCTION PIPE INSTALLED WITH
A GRADUAL RISE TO PUMP
Provide for pipe expansion when hot fluids are to be pumped.
LEVEL
SUCTION PIPING
CL OF PIPE
CORRECT
When installing the suction piping, observe the following precautions. See Figure 3.
AIR POCKET
The sizing and installation of the suction piping is extremely
important. It must be selected and installed so that pressure
losses are minimized and sufficient liquid will flow into the
pump when started and operated. Many NPSH (Net Positive
INCORRECT
AIR POCKET
Suction Head) problems can be attributed directly to improper
suction piping systems.
Friction losses caused by undersized suction piping can increase
the fluid’s velocity into the pump. As recommended by the
Hydraulic Institute Standard ANSI/HI 1.1-1.5-1994, suction
pipe velocity should not exceed the velocity in the pump suction
nozzle. In some situations pipe velocity may need to be further
reduced to satisfy pump NPSH requirements and to control
suction line losses. Pipe friction can be reduced by using pipes
that are one to two sizes larger than the pump suction nozzle in
order to maintain pipe velocities less than 5 feet/second.
INCORRECT
AIR POCKET
INCORRECT
GRADUAL RISE
TO PUMP
Suction piping should be short in length, as direct as possible,
and never smaller in diameter than the pump suction opening.
NO AIR
POCKETS
CORRECT
If the suction pipe is short, the pipe diameter can be the same
size as the suction opening. If longer suction pipe is required,
pipes should be one or two sizes larger than the opening, depending on piping length.
NO AIR
POCKETS
Suction piping for horizontal double suction pumps should
not be installed with an elbow close to the suction flange of the
pump, except when the suction elbow is in the vertical plane.
GRADUAL RISE
TO PUMP
ECCENTRIC
REDUCER
CORRECT
DISTANCE PLUS
ECCENTRIC REDUCER
STRAIGHTENS FLOW
A suction pipe of the same size as the suction nozzle, approaching at any angle other than straight up or straight down, must
have the elbow located 10 pipe diameters from the suction
flange of the pump. Vertical mounted pumps and other space
limitations require special piping.
CORRECT
There is always an uneven turbulent flow around an elbow.
When it is in a position other than the vertical it causes more
liquid to enter one side of the impeller than the other. See
Figure 4. This results in high un-equalized thrust loads that
will overheat the bearings and cause rapid wear, in addition to
affecting hydraulic performance.
PATH OF
WATER
INCORRECT
FIGURE 3 – Good Piping Practices
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IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
Installation, Operation & Maintenance Manual
When operating on a suction lift, the suction pipe should slope
upward to the pump nozzle. A horizontal suction line must
have a gradual rise to the pump. Any high point in the pipe will
become filled with air and thus prevent proper operation on
the pump. When reducing the piping to the suction opening
diameter, use an eccentric reducer with the eccentric side down
to avoid air pockets.
same suction line, install gate valves so that any pump
can be isolated from the line. Gate valves should be installed on the suction side of all pumps with a positive
pressure for maintenance purposes. Install gate valves
with stems horizontal to avoid air pockets. Globe
valves should not be used, particularly where NPSH is
critical.
NOTE: When operating on suction lift, never use a straight
taper reducer in a horizontal suction line, as it tends to form an
air pocket in the top of the reducer and the pipe.
d. The pump must never be throttled by the use of a
valve on the suction side of the pump. Suction valves
should be used only to isolate the pump for maintenance purposes, and should always be installed in positions to avoid air pockets.
To facilitate cleaning pump liquid passage without dismantling
pump, a short section of pipe (Dutchman or spool piece), so
designed that it can be readily dropped out of the line, can be
installed adjacent to the suction flange. With this arrangement,
any matter clogging the impeller is accessible by removing the
nozzle (or pipe section).
WATER PRESSURE
INCREASES HERE CAUSING
A GREATER FLOW TO ONE
SIDE OF THE IMPELLER
CASING RINGS
PUMP CASING
e. A pump drain valve should be installed in the suction piping between the isolation valve and the pump.
DISCHARGE PIPING
If the discharge piping is short, the pipe diameter can be the
same as the discharge opening. If the piping is long, pipe diameter should be one or two sizes larger than the discharge opening. On long horizontal runs, it is desirable to maintain as even
a grade as possible. Avoid high spots, such as loops, which will
collect air and throttle the system or lead to erratic pumping.
Valves in Discharge Piping
SUCTION
ELBOW
PUMP SUCTION
FLANGE
IMPELLER
A triple duty valve should be installed in the discharge. The
triple duty valve placed on the pump protects the pump from
excessive back pressure, and prevents liquid from running back
through the pump in case of power failure.
FIGURE 4 – Good Piping Practices
Valves in Suction Piping
When installing valves in the suction piping, observe the following precautions:
a. If the pump is operating under static suction lift
conditions, a foot valve may be installed in the suction
line to avoid the necessity of priming each time the
pump is started. This valve should be of the flapper
type, rather than the multiple spring type, sized to
avoid excessive friction in the suction line. (Under
all other conditions, a check valve, if used, should be
installed in the discharge line (See “Valves in Discharge
Piping” below).
b. When foot valves are used, or where there are other
possibilities of “water hammer,” close the discharge
valve slowly before shutting down the pump.
When fluid velocity in the pipe is high, for example, 10 ft/s (3 m/s)
or higher, a rapidly closing discharge valve can cause a damaging
pressure surge. A dampening arrangement should be provided in
the piping.
Pressure Gauges
Properly sized pressure gauges should be installed in both the
suction and discharge nozzles in the gauge taps (which are provided on request). The gauges will enable the operator to easily
observe the operation of the pump, and also determine if the
pump is operating in conformance with the performance curve.
If cavitation, vapor binding, or other unstable operation should
occur, widely fluctuating discharge pressure will be noted.
c. Where two or more pumps are connected to the
IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
11
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Installation, Operation & Maintenance Manual
PACKING
Pump Insulation
On chilled water applications most pumps are insulated. As
part of this practice, the pump bearing housings should not be
insulated since this would tend to “trap” heat inside the housing.
This could lead to increased bearing temperatures and premature bearing failures.
PUMP AND SHAF T ALIGNMENT
CHECK
After connecting piping, rotate the pump drive shaft clockwise
(view from motor end) by hand several complete revolutions to
be sure there is no binding and that all parts are free. Recheck
shaft alignment. If piping caused unit to be out of alignment,
correct piping to relieve strain on the pump.
When the pump is intended to be equipped with shaft packing, it is not American-Marsh’s standard practice to install the
packing in the stuffing box prior to shipment. The packing is
shipped with the pump. It is the pump installer’s responsibility
to install the packing in the stuffing box.
Failure to ensure that packing is installed may result in serious leakage of the pumped fluid.
PIPING CONNECTION –SEAL/
PACKING SUPPORT SYSTEM
MECHANICAL SEAL
When the pump is intended to be equipped with a mechanical seal, it is American-Marsh’s standard practice to install the
mechanical seal in the pump prior to shipment. Specific order
requirements may specify that the seal be shipped separately,
or none be supplied. It is the pump installer’s responsibility to
determine if a seal was installed. If a seal was supplied but not
installed, the seal and installation instructions will be shipped
with the pump.
If the pump has a seal support system, it is mandatory that this system be fully installed and operational before the pump is started.
If packing is used:
Packing Lubrication – Water, when compatible with the pumpage, should be introduced into the packing box at pressure 10 to
15 lbf/in2 (69 to 103 kPa) above the stuffing box pressure.
Failure to ensure that a seal is installed may result in serious leakage
of the pumped fluid.
Seal and seal support system must be installed and operational
as specified by the seal manufacturer.
Mechanical seals are preferred over packing on some applications because of better sealing qualities and longer serviceability.
Leakage is eliminated when a seal is properly installed, and
normal life is much greater than that of packing on similar applications.
Pumps containing single mechanical seals normally utilize the
pumped liquid to lubricate the seal faces. This method is preferred when the pumped liquid is neither abrasive nor corrosive.
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The gland should be adjusted to give a flow rate of 20 to 30
drops per minute for clean fluid. For abrasive applications, the
regulated flow rate should be 1-2 gpm (0.06-0.13 l/s).
Grease lubrication, when compatible with the pumpage, may
be used. In non-abrasive applications the pumpage itself may
be sufficient to lubricate the packing without need for external
lines. The internal flush line should be plugged.
Abrasive Packing Arrangement – The installation procedures
are the same as the standard packing with some exceptions. A
special lip seal is installed first, followed by two lantern ring assemblies, then two of the packing rings provided.
A flush line from a clean external source should be connected to
the top of the stuffing box.
BEARING LUBRICATION
Grease lubricated ball bearings are packed with grease at the
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IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
Installation, Operation & Maintenance Manual
factory and ordinarily will require no attention before starting,
provided the pump has been stored in a clean, dry place prior
to its first operation. The bearings should be watched the first
hour or so after the pump has been started to see that they are
operating properly.
The importance of proper lubrication cannot be over emphasized. It is difficult to say how often a bearing should be
greased, since that depends on the conditions of operation. It
is well to add one ounce of grease at regular intervals, but it is
equally important to avoid adding too much grease. For average
operating conditions, it is recommended that 1 oz. of grease be
added at intervals of three to six months, and only clean grease
be used. It is always best if unit can be stopped while grease is
added to avoid overloading.
Maximum Oil
Temperature
ISO Viscosity
Grade
Minimum Viscosity
Index
160-175°F (71°80°C)
68
95
100
95
Up to 160°F
(71°C)
46
175-200°F (80°94°C)
95
FIGURE 6 – Oil Viscosity Grades
Lubricant
Grease
Mineral Oil
Synthetic
Oil**
Under 60°F
(71°C)
160-175°F
(71-80°C)
175-200°F
(80-94°C)
6 mo
3 mo
1.5 mo
6 mo
18 mo
3 mo
18 mo
1.5 mo
18 mo
FIGURE 7 – Re-lubrication Intervals
Excess grease is the most common cause of overheating.
A lithium based NLGI-2 grade grease should be used for lubricating bearings where the ambient temperature is above -20°F.
Grease lubricated bearings are packed at the factory with Royal
Purple NLGI #2. Other recommended greases are Texaco
Multifak 2, Shell Alvania 2 and Mobilux No. 2 grease. Greases
made from animal or vegetable oils are not recommended due
to the danger of deterioration and forming of acid. Do not use
graphite. Use of an ISO VG 100 mineral base oil with rust and
oxidation inhibitors is recommended.
The maximum desirable operating temperature for ball bearings is 180°F. Should the temperature of the bearing frame rise
above 180°F, the pump should be shut down to determine the
cause.
Mineral Oil
Synthetic
Grease
Quality mineral oil with rust and oxidation
inhibitors. Mobil DTE Heavy/Medium
ISO VG 68 or equivalent.
COUPLING
A direction arrow is cast on the casing. Make sure the motor
rotates in the same direction before coupling the motor to the
Pump.
It is absolutely essential that the rotation of the motor be
checked before connecting the shaft coupling. Incorrect rotation of the pump, for even a short time, can dislodge the shaft
sleeves which may cause serious damage to the pump.
The coupling should be installed as advised by the coupling
manufacturer. Pumps are shipped without the spacer installed.
If the spacer has been installed to facilitate alignment, then it
must be removed prior to checking rotation. Remove protective material from the coupling and any exposed portions of the
shaft before installing the coupling.
PUMP OPERATION
ROTATION CHECK
Royal Purple SynFilm 68, Conoco SYNCON 68 or equivalent. Some synthetic
lubricants require Viton O-rings.
Royal Purple NLGI #2, Chevron SRI #2 (or
compatible).
FIGURE 5 – Recommended Lubricants
It is absolutely essential that the rotation of the motor be checked
before connecting the shaft coupling. Incorrect rotation of the pump,
for even a short time, can dislodge and damage the shaft sleeves,
impeller, casing, shaft and shaft seal.
IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
13
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Installation, Operation & Maintenance Manual
HD pumps can turn clockwise or counter-clockwise and therefore rotation must be specified at time of order.
PRE START-UP CHECKS
For a pump to operate properly the NPSHA must be greater
than the NPSHR. Good practice dictates that this margin
should be at least 5 ft (1.5 m) or 20%, whichever is greater.
Prior to starting the pump it is essential that the following
checks are made. These checks are all described in detail in the
Maintenance Section of this booklet.
•
•
•
•
Pump and Motor properly secured to the base plate
Check alignment of pump and motor
Coupling guard in place and not rubbing
Rotation check, see above
THIS IS ABSOLUTELY ESSENTIAL
•
•
•
•
•
•
Shaft seal and/or packing properly installed
Seal support system operational
Bearing lubrication
Pump instrumentation is operational
Pump is primed
Rotation of shaft by hand
As a final step in preparation for operation, it is important to
rotate the shaft by hand to be certain that all rotating parts
move freely, and that there are no foreign objects in the pump.
PRIMING
If the pump is installed with a positive head on the suction, it
can be primed by opening the suction and vent valve and allowing the liquid to enter the casing. If the pump is installed with
a suction lift, priming must be done by other methods such as
foot valves, ejectors, or by manually filling the casing and suction line.
Ensuring that NPSHA is larger than NPSHR by the suggested
margin will greatly enhance pump performance and reliability.
It will also reduce the likelihood of cavitation, which can severely
damage the pump.
MINIMUM FLOW
Minimum continuous stable flow is the lowest flow at which the
pump can operate and still conform to the bearing life, shaft
deflection and bearing housing vibration limits of the ASME
standard. Pumps may be operated at lower flows, but it must
be recognized that the pump may not conform to one or more
of these limits. For example, vibration may exceed the limit
set by the ASME standard. The size of the pump, the energy
absorbed, and the liquid pumped are some of the considerations
in determining the minimum flow.
Typically, limitations of 20% of the capacity at the best efficiency point (BEP) should be specified as the minimum flow.
However, American-Marsh has determined that several pumps
must be limited to higher minimum flows to provide optimum
service. The following are the recommended minimum flows for
these specific pumps:
ENSURING PROPER NPSHA
Net Positive Suction Head – Available (NPSHA) is the measure
of the energy in a liquid above the vapor pressure. It is used to
determine the likelihood that a fluid will vaporize in the pump.
It is critical because a centrifugal pump is designed to pump a
liquid, not a vapor. Vaporization in a pump will result in damage to the pump, deterioration of the Total Differential Head
(TDH), and possibly a complete stopping of pumping.
Net Positive Suction Head – Required (NPSHR) is the decrease
of fluid energy between the inlet of the pump, and the point
of lowest pressure in the pump. This decrease occurs because
of friction losses and fluid accelerations in the inlet region of
the pump, and particularly accelerations as the fluid enters the
impeller vanes. The value for NPSHR for the specific pump
purchased is given in the pump data sheet, and on the pump
performance curve.
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60 Hz
Pump
Size
RPM
Module 1
3500
Module 2
3500
Module 1
Module 2
All Other
Sizes
1750
1750
ANY
50 Hz
Minimum
Flow
(% of BEP)
RPM
25%
1450
25%
2900
25%
2900
33%
15%
1450
ANY
Minimum
Flow
(% of BEP)
21%
21%
21%
28%
15%
FIGURE 8 - Minimum Continuous Safe Flow
Note: “Minimum intermittent flow” value of 50% of the “minimum continuous flow” as long as that flow is greater than the
“minimum thermal flow.”
All HD pumps also have a “Minimum Thermal Flow.” This
is defined as the minimum flow that will not cause an excessive temperature rise. Minimum Thermal Flow is application
14
IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
Installation, Operation & Maintenance Manual
dependent.
Do not operate the pump below Minimum Thermal Flow, as this
could cause an excessive temperature rise. Contact an AmericanMarsh Sales Engineer for determination of Minimum Thermal
flow.
It is important that the discharge valve be opened within a short
interval after starting the driver. Failure to do this could cause a
dangerous build up of heat, and possibly an explosion.
6. Reduced capacity
Avoid running a centrifugal pump at drastically
reduced capacities or with discharge valve closed for
extended periods of time. This can cause severe temperature rise and the liquid in the pump may reach its
boiling point. If this occurs, the mechanical seal will be
exposed to vapor, with no lubrication, and may score or
seize to the stationary parts. Continued running under
these conditions when the suction valve is also closed,
can create an explosive condition due to the confined
vapor at high pressure and temperature. Thermostats
may be used to safeguard against over heating by shutting down the pump at a predetermined temperature.
STARTING THE PUMP AND ADJUSTING FLOW
1. Open the suction valve to full open position. It is
very important to leave the suction valve open while
the pump is operating. Any throttling or adjusting
of flow must be done through the discharge valve.
Partially closing the suction valve can create serious
NPSH and pump performance problems.
Safeguards should also be taken against possible operation with a closed discharge valve, such as installing a
bypass back to the suction source. The size of the bypass line and the required bypass flow rate is a function
of the input horsepower and the allowable temperature
rise.
7. Reduced Head
Note that when discharge head drops, the pump’s flow
rate usually increases rapidly. Check motor for temperature rise as this may cause overload. If overloading
occurs, throttle the discharge.
Never operate pump with both the suction and discharge valves
closed. This could cause an explosion.
2. A standard centrifugal pump will not move liquid unless the pump is primed. A pump is said to be
“primed” when the casing and the suction piping are
completely filled with liquid. Open discharge valve a
slight amount. This will allow any entrapped air to escape and will normally allow the pump to prime, if the
suction source is above the pump. When a condition
exists where the suction pressure may drop below the
pump’s capability, it is advisable to add a low pressure
control device to shut the pump down when the pressure drops below a predetermined minimum.
3. All cooling, heating, and flush lines must be started
and regulated.
4. Start the driver (typically, the electric motor).
5. Slowly open the discharge valve until the desired
flow is reached, keeping in mind the minimum flow
restrictions listed above.
IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
8. Surging Condition
A rapidly closing discharge valve can cause a damaging
pressure surge. A dampening arrangement should be
provided in the piping.
OPERATION IN SUB-FREEZING
CONDITIONS
When using the pump in sub-freezing conditions where the
pump is periodically idle, the pump should be properly drained
or protected with thermal devices which will keep the liquid
in the pump from freezing. High chrome iron pumps are not
recommended for applications below 0°F (-18°C).
SHUTDOWN CONSIDERATIONS
When the pump is being shutdown, the procedure should be
the reverse of the start-up procedure. First, slowly close the
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15
Installation, Operation & Maintenance Manual
discharge valve, shutdown the driver, then close the suction
valve. Remember, closing the suction valve while the pump is
running is a safety hazard and could seriously damage the pump
and other equipment.
TROUBLESHOOTING
The following is a guide to troubleshooting problems with
American-Marsh pumps. Common problems are analyzed and
solutions are offered. Obviously, it is impossible to cover every
possible scenario. If a problem exists that is not covered by one
of the examples, then contact a local American-Marsh Sales
Engineer or Distributor/Representative for assistance.
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IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
Installation, Operation & Maintenance Manual
PROBLEM
Problem #1
Pump not reaching design flow rate.
POSSIBLE CAUSE
RECOMMENDED REMEDY
1.2
System head greater than anticipated.
Reduce system head by increasing pipe
size and/ than or reducing number of
fittings. Increase impeller diameter.
NOTE: Increasing impeller diameter
may require use of a larger motor.
1.1
Insufficient NPSHA. (Noise may not
be present)
1.3
Entrained air.
1.4
Entrained gas from process.
1.5
Speed too low.
1.6
Direction of rotation wrong.
1.7
Impeller too small.
1.8
Impeller clearance too large.
Problem #2.0
Pump not reaching design head
(TDH).
Problem #3.0
No discharge or flow
IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
Recalculate NPSH available. It must
be greater than the NPSH required by
pump at desired flow. If not, redesign
suction piping, holding number of
elbows and number of planes to a minimum to avoid adverse flow rotation as it
approaches the impeller.
Air leak from atmosphere on suction
side.
1. Check suction line gaskets and
threads for tightness.
2. If vortex formation is observed in suction tank, install vortex breaker.
3. Check for minimum submergence.
Process generated gases may require
larger pumps.
Check motor speed against design
speed.
After confirming wrong rotation,
reverse any two of three leads on a three
phase motor. The pump should be
disassembled and inspected before it is
restarted.
Replace with proper diameter impeller.
NOTE: Increasing impeller diameter
may require use of a larger motor.
Replace impeller and/or case wear rings.
1.9
Plugged impeller, suction line or casing
which may be due to a product or large
solids.
1. Reduce length of fiber when possible.
2. Reduce solids in the process fluid
when possible.
3. Consider larger pump.
2.1
Refer to possible causes under Problem
#1.0.
Refer to remedies listed under Problem
#1.0 and #3.0.
1.10
Wet end parts (casing cover, impeller)
worn, corroded or missing.
3.1
Not properly primed.
17
Replace part or parts.
Repeat priming operation, recheck
instructions. If pump has run dry, disassemble and inspect the pump before
operation.
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Installation, Operation & Maintenance Manual
PROBLEM
Cont. Problem #3.0
No discharge or flow
POSSIBLE CAUSE
RECOMMENDED REMEDY
3.3
Entrained air.
Air leak from atmosphere on suction
side.
Refer to recommended remedy
under Problem #1.0, Item #1.3.
3.2
Direction of rotation wrong.
3.4
Plugged impeller, suction line or casing
which may be due to a fibrous product
or large solids.
Problem #4.0
Pump operates for short period, then
loses prime.
Problem #5.0
Excessive noise from wet end.
Replace damaged parts.
4.2
Entrained air.
Air leak from atmosphere on suction
side. Refer to recommended remedy
under Problem #1.0, Item #1.1.
4.1
Insufficient NPSH.
Refer to recommended remedy under
Problem #1.0, Item #1.1.
5.1
Cavitation - insufficient NPSH available.
Refer to recommended remedy under
Problem #1.0, Item #1.1.
5.3
Impeller rubbing.
6.1
Bearing contamination appearing
on the raceways as scoring, pitting,
scratching, or rusting caused by adverse
environment and entrance of abrasive
contaminants from atmosphere.
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Refer to recommended remedy under
Problem #1.0, Item #1.9.
3.5
Damaged pump shaft, impeller.
5.2
Abnormal fluid rotation due to complex
suction piping.
Problem #6.0
Excessive noise from bearings.
After confirming wrong rotation,
reverse any two of three leads on a three
phase motor. The pump should be disassembled and inspected before operation.
18
Redesign suction piping, holder number
of elbows and number of planes to a
minimum to avoid adverse fluid rotation
as it approaches the impeller.
1. Replace impeller and/or case wear
rings.
2. Check outboard bearing assembly for
axial end play.
1. Work with clean tools in clean surroundings.
2. Remove all outside dirt from housing
before exposing bearings.
3. Handle with clean dry hands.
4. Treat a used bearing as carefully as a
new one.
5. Use clean solvent and flushing oil.
6. Protect disassembled bearing from
dirt and moisture.
7. Keep bearings wrapped in paper or
clean cloth while not in use.
8. Clean inside of housing before replacing bearings.
9. Check oil seals and replace as required.
10. Check all plugs and tapped openings
to make sure that they are tight.
IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
Installation, Operation & Maintenance Manual
PROBLEM
Cont. Problem #6.0
Excessive noise from bearings.
POSSIBLE CAUSE
RECOMMENDED REMEDY
6.3
False brinelling of bearing identified
again by either axial or circumferential
indentations usually caused by vibration of the balls between the races in a
stationary bearing.
1. Correct the source of vibration.
2. Where bearings are oil lubricated and
employed in units that may be out of
service for extended periods, the drive
shaft should be turned over periodically
to re-lubricate all bearing surfaces at
intervals of one-to three months.
6.2
Brinelling of bearing identified by
indentation on the ball races, usually
caused by incorrectly applied forces
in assembling the bearing or by shock
loading such as hitting the bearing or
drive shaft with a hammer.
6.4
Thrust overload on bearing identified by
flaking ball path on one side of the outer
race or in the case of maximum capacity bearings, may appear as a spalling of
the races in the vicinity of the loading
slot. (Please note: maximum capacity
bearings are not recommended in HD
pumps.) These thrust failures are caused
by improper mounting of the bearing or
excessive thrust loads.
6.5
Misalignment identified by fracture of
ball retainer or a wide ball path on the
inner race and a narrower cocked ball
path on the outer race. Misalignment
is caused by poor mounting practices
or defective drive shaft. For example
bearing not square with the centerline
or possibly a bent shaft due to improper
handling.
6.6
Bearing damaged by electric arcing
identified as electro-etching of both
inner and outer ring as a pitting or
cratering. Electrical arcing is caused by
a static electrical charge eminating from
belt drives, electrical leakage or short
circuiting.
IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
19
When mounting the bearing on the
outboard end use a proper size ring and
apply the pressure against the inner ring
only. Be sure when mounting a bearing
to apply the mounting pressure slowly
and evenly.
1. Follow correct mounting procedures
for bearings.
Handle parts carefully and follow
recommended mounting procedures.
Check all parts for proper fit and alignment.
1. Where current shunting through the
bearing cannot be corrected, a shunt in
the form of a slip ring assembly should
be incorporated.
2. Check all wiring, insulation and rotor
windings to be sure that they are sound
and all connections are properly made.
3. Where pumps are belt driven, consider the elimination of static charges
by proper grounding or consider belt
material that is less generative.
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Installation, Operation & Maintenance Manual
PROBLEM
Cont. Problem #6.0
Excessive noise from bearings.
POSSIBLE CAUSE
6.7
Bearing damage due to improper lubrication, identified by one or more of the
following:
1. Abnormal bearing temperature rise.
2. A stiff cracked grease appearance.
3. A brown or bluish discoloration of the
bearing races.
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20
RECOMMENDED REMEDY
1. Be sure the lubricant is clean.
2. Be sure proper amount of lubricant
is used. The constant level oiler supplied with HD pumps will maintain the
proper oil level if it is installed and operating properly. In the case of greased
lubricated bearings, be sure that there is
space adjacent to the bearing into which
it can rid itself of excessive lubricant,
otherwise the bearing may overheat and
fail prematurely.
3. Be sure the proper grade of lubricant
is used.
IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
Installation, Operation & Maintenance Manual
MAINTENANCE
PREVENTIVE MAINTENANCE
The following sections of this manual give instructions on how
to perform a complete maintenance overhaul. However, it is also
important to periodically repeat the “Pre start-up checks” listed
on page 14. These checks will help extend pump life as well as
the length of time between major overhauls.
that might clog the box. Mechanical seals should be cleaned
and thoroughly flushed.
Couplings should be dismantled and thoroughly cleaned.
Any pump that is properly sealed at all joints and connected to
both the suction and discharge should exclude outside liquid.
Therefore, it should not be necessary to go beyond the bearings,
stuffing box, and coupling when servicing the pump.
NEED FOR MAINTENANCE RECORDS
ROUTINE MAINTENANCE CHART
A procedure for keeping accurate maintenance records is a
critical part of any program to improve pump reliability. There
are many variables that can contribute to pump failures. Often
long term and repetitive problems can only be solved by analyzing these variables through pump maintenance records.
Every Week
Every Month
NEED FOR CLEANLINESS
One of the major causes of pump failure is the presence of
contaminants in the bearing housing. This contamination can
be in the form of moisture, dust, dirt and other solid particles
such as metal chips. Contamination can also be harmful to the
mechanical seal (especially the seal faces) as well as other parts
of the pumps. For example, dirt in the shaft threads could cause
the impeller to not be seated properly against the shaft sleeve.
This, in turn, could cause a series of other problems. For these
reasons, it is very important that proper cleanliness be maintained. Some guidelines are listed below.
If it is contaminated, determine the cause and correct. The work
area should be clean and free from dust, dirt, oil, grease, etc.
Hands and gloves should be clean. Only clean towels, rags, and
tools should be used.
MAINTENANCE OF PUMP DUE TO
FLOOD DAMAGE
The servicing of centrifugal pumps after a flooded condition is a
comparatively simple matter under normal conditions.
Every 6 Months
Every Year
Check bearing temperature
with a thermometer
Check the packing and
replace if necessary
Check alignment of the
pump and motor
Check holding down bolts
for tightness
Check coupling for wear
Check rotating element for
wear
Check wear ring clearances
Check and regrease bearings
Measure total dynamic suction and discharge head
FIGURE 9 - Routine Maintenance Chart
DISASSEMBLY
Refer to the parts list shown in Figure 19 for item number references used throughout this section.
1. Before performing any maintenance, disconnect the
driver from its power supply and lock it off line.
Bearings are a primary concern on pumping units. First,
dismantle the bearings; clean and inspect them for any rusted
or badly worn surfaces. If bearings are free from rust and wear,
re-assemble and re-lubricate them with one of the recommended pump lubricants. Depending on the length of time the pump
has remained in the flooded area, it is unlikely that bearing replacement is necessary; however, in the event that rust or worn
surfaces appear, it may be necessary to replace the bearings.
Lock out power to driver to prevent personal injury.
Next, inspect the stuffing box, and clean out any foreign matter
IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
Visually check for leaks
Check for lubrication
Adjust glands as necessary
to maintain proper leakage
Hand test bearing housing
for any sign of temperature
rise
21
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Installation, Operation & Maintenance Manual
2. Close the discharge and suction valves, and drain all
liquid from the pump.
14. Remove outboard lip seal (#104N) and discard.
Remove inboard lip seal (#104P) and discard.
3. Close all valves on auxiliary equipment and piping,
then disconnect all auxiliary piping.
15. Remove the outboard and inboard bearing spacers
(#45A).
4. Decontaminate the pump as necessary. If American-Marsh pumps contain dangerous chemicals, it is
important to follow plant safety guidelines to avoid
personal injury or death.
DISASSEMBLY OF PACKED PUMPS
16. Remove four cap screws that hold the outboard
bearing arm (#86N) and inboard bearing arm (#86P)
to the stuffing box (#1B). Loosen and remove gland
nuts (#72C) from the outboard and inboard locations.
Remove bearing arms (#86N & #86P) and gland assemblies (#71A) from outboard and inboard locations.
5. Remove the coupling guard.
6. Remove the spacer coupling and drive key.
7. Drain the pump by removing the vent plug at the
top of the casing (#1A).
17. Slide outboard and inboard stuffing boxes (#1B) off
of shaft assembly.
8. Remove the fasteners holding the upper casing
(#1A) to the lower casing (#1A). Remove any external
piping if supplied. Remove the two (2) casing dowel
pins from the casing assembly.
18. Remove and discard all rings of packing (#331A),
since replacement with new packing is recommended
whenever pump is disassembled. Be sure to remove
all packing from the stuffing box. Remember there
are rings of packing behind the lantern ring (#73A).
Inspect the lantern ring (#73A) for damage and replace
if necessary.
9. Insert a screwdriver or pry bar into the slots between
the upper (#1A) and lower (#1A) casing halves and
separate the halves, lifting off the upper (#1A) casing
half. Discard the casing gasket (#353A).
19. Remove both casing wear rings (#15A) from impeller (#11D).
Right-Hand Rotation
The upper casing (#1A) is heavy. It is important to follow plant
safety guidelines when lifting it.
10. Lightly tap the stuffing boxes (#1B) with a soft
headed hammer to break the seal between the stuffing
box (#1B) and the lower casing (#1A). Lift the rotating
assembly out of the lower casing half (#1A). Discard
the stuffing box o-rings (#331D).
20. Unscrew shaft sleeve (#42A) from the outboard
end and slide off of shaft (#41A). Discard shaft sleeve
o-ring (#331C).
Left-Hand Rotation
21. Unscrew shaft sleeve (#42A) from the inboard end
and slide off of shaft (#41A). Discard shaft sleeve oring (#331C).
22. Remove the impeller (#11D), slide back the
impeller key (#24A) and remove the other shaft sleeve
(#42A). Discard shaft sleeve o-ring (#331C). Remove
the impeller key (#24A) from shaft (#41).
11. Remove the four cap screws (384B) from each
bearing housing cap (#82N & #82P).
12. Remove the locknut (#89N) and lockwasher
(#91N) from the outboard end of the shaft (#41). Using a puller, pull the outboard bearing (#81N) from the
shaft (#41) and discard.
DISASSEMBLY OF MECHANICALLY
SEALED PUMPS
23. Slide outboard and inboard seal chambers (#1B)
off of shaft assembly.
13. Using a puller, pull the inboard bearing (#81P)
from the shaft (#41) and discard.
24. Drive the mechanical seal stationary out of seal
chamber (#1B).
NOTE: Locknut and lockwasher are not used on
inboard end of shaft.
www.american-marsh.com
22
25. Slide the rotating elements of the mechanical seal
IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
Installation, Operation & Maintenance Manual
(#331B) off of the shaft (#41A).
RE-ASSEMBLY
26. Remove both casing wear rings (#15A) from impeller (#11D).
BEARING INSTALLATION
Right-Hand Rotation
27. Unscrew shaft sleeve (#42A) from the outboard
end and slide off of shaft (#41A).
Left-Hand Rotation
28. Unscrew shaft sleeve (#42A) from the inboard end
and slide off of shaft (#41A). Discard shaft sleeve oring (#331C).
29. Remove the impeller (#11D), slide back the
impeller key (#24A) and remove the other shaft sleeve
(#42A). Discard shaft sleeve o-ring (#331C). Remove
the impeller key (#24A) from shaft (#41).
Module
1, 2, 3
4, 5, 6
7
Mounting of bearings on shafts must be done in a clean environment. Bearing and power end life can be drastically reduced
if even very small foreign particles work their way into the bearings.
Bearings should be removed from their protective packaging
only immediately before assembly to limit exposure to possible
contamination. After removing the packaging they should
only come in contact with clean hands, fixtures, tools and work
surfaces.
The chart shown in Figure 10 gives the SKF part numbers for
bearings in American-Marsh HD pumps. Note that the term
“inboard bearing” refers to the bearing nearest to the motor.
“Outboard bearing” refers to the bearing farthest from the motor.
Type of Bearings
Inboard
Single Row,
Deep Groove
Outboard
Single
Deep Groove
6309-C3
6309-ZC3
6309-2ZC3
6309-2RSIC3
6309-C3
6309-ZC3
6309-2ZC3
6309-2RSIC3
6306-C3
6306-ZC3
6306-2ZC3
6306-2RSIC3
Oil bath/mist – Open
Regreasable – Single Shielded
Greased for life – Double Shielded
Sealed for life – Double Sealed
Oil bath/mist – Open
Regreasable – Single Shielded
Greased for life – Double Shielded
Sealed for life – Double Sealed
6312-C3
6312-ZC3
6312-2ZC3
6312-2RSIC3
Oil bath/mist – Open
Regreasable – Single Shielded
Greased for life – Double Shielded
Sealed for life – Double Sealed
6306-C3
6306-ZC3
6306-2ZC3
6306-2RSIC3
6312-C3
6312-ZC3
6312-2ZC3
6312-2RSIC3
FIGURE 10 – AMP HD Bearings
These bearings are open on both sides. They are lubricated by oil bath or oil mist.
These bearings are pre-greased by American-Marsh. Replacement bearings will generally not be pre-greased, so grease must be applied by the user. They have a
single shield, which is located on the side next to the grease buffer, or reservoir. The bearings draw grease from the reservoir as it is needed. The shield protects the
bearing from getting too much grease, which would generate heat. The grease reservoir is initially filled with grease by American-Marsh. Lubrication fittings are
provided, to allow the customer to periodically replenish the grease, as recommended by the bearing and/or grease manufacturer.
These bearings are shielded on both sides. They come pre-greased by the bearing manufacturer. The user does not need to re-grease these bearings. The shields do
not actually contact the bearing race, so no heat is generated.
These bearings are sealed on both sides. They come pre-greased by the bearing manufacturer. The user does not need to re-grease these bearings. The seals physically contact and rub against the bearing race, which generates heat. These bearings are not recommended at speeds above 1750 RPM.
The codes shown are SKF codes. Inboard and outboard bearings have the C3, greater than “Normal” clearance. These clearances are recommended by SKF to
maximize bearing life.
Re-greasable – Single Shielded bearings are not available in the duplex configuration; however, open oil bath-type bearings can be used for the re-greasable configuration. These bearings must be pre-greased during assembly. Lubrication fittings are provided, to allow the user to periodically replenish the grease, as recommended
by the bearing and/or grease manufacturer.
Not available.
IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
23
www.american-marsh.com
Installation, Operation & Maintenance Manual
4. Check impeller (#11D) for correct rotation (See
Figure 12) and slide onto shaft (#41A) from outboard
end.
RE-ASSEMBLY OF PUMPS
RIGHT-HAND ROTATION
5. Screw the second shaft sleeve (#42A) onto the shaft
(#41A) locking it tight up against the impeller (#11D)
and the first shaft sleeve (#42A).
A
Mechanical Seal
Packed
2.5x3-10 HD
7.813
11.125
4x6-10 HD
10.000
6x8-10 HD
9.938
10x10-10 HD
12.500
3x4-12 HD
7.813
5x6-11 HD
4x5-12 HD
5x6-12 HD
7.813
7.813
9.938
6x8-12 HD
10.063
10x10-12 HD
12.500
8x10-12 HD
2x3-15 HD
3x4-15 HD
12.500
7.813
7.813
4x5-15 HD
10.063
6x8-15 HD
10.063
5x6-15 HD
8x10-15 HD
10x12-15 HD
4x5-18 HD
5x6-18 HD
6x8-18 HD
8x10-18 HD
10x12-18 HD
10.063
13.000
13.000
10.000
13.000
13.000
13.000
15.688
14.000
13.250
13.250
16.313
11.125
11.125
11.125
SUCTION
9.938
11.125
13.250
RIGHT-HAND ROTATION VIEWED
FROM THE MOTOR END
16.313
ROTATION
14.000
16.313
11.125
11.125
14.000
14.000
14.000
16.500
16.500
14.000
16.500
LEFT-HAND ROTATION VIEWED
FROM THE MOTOR END
16.500
16.500
16.500
FIGURE 12 - Proper Impeller Rotation
6. Slide both case wear rings (#15A) onto the impeller
(#11D).
FIGURE 11 - Right-Hand Shaft Sleeve Dimensions
1. Place new shaft sleeve o-rings (#331C) onto shaft
sleeves (#41A).
7. Lubricate and roll the seal chamber o-ring (#331D)
into the groove of the seal chamber (#1B).
2. Wipe over shaft (#41A) with clean light oil. Screw
shaft sleeve (#42A) onto shaft (#41A) at the inboard
location until the non threaded end of the shaft sleeve
(#41A) is properly lined up with the step on the shaft
(#41A). See Figure 11.
3. Place impeller key (#24A) into shaft keyway and tap
milled-down end under the shaft sleeve (#42A).
www.american-marsh.com
DISCHARGE
5x6-10 HD
7.813
ROTATION
DISCHARGE
3x4-10 HD
A – Inches
SUCTION
Pump Model
8. Pre-lubricate the rotary part of the mechanical seal
(#331B) and slide the mechancial seals onto the shaft
(#41) from both the outboard and inboard locations.
9. Press the stationary seal face (#331B) into the seal
chamber (#1B).
24
IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
Installation, Operation & Maintenance Manual
IF USING MECHANICAL SEALS
10. Slide the seal chamber (#1B) up onto the shaft
assembly, taking care not to damage the shaft sleeves
(#42A) or the stationary seal face keeping the vortex
suppressor at the top, 12 o’clock position.
grease and slide into place over the bearing (#81N).
Slight tapping of the bearing housing may be necessary
as there are fairly tight tolerances between the bearing
(#81N) and the bearing housing (#82N). Secure the
bearing housing (#82N) to the bearing arm (#86N)
with the four hex head capscrews (#384B).
IF USING PACKING
11. Lubricate and roll the stuffing box o-ring (#331D)
into the groove of the stuffing box (#1B).
12. Slide the stuffing boxes (#1B) up onto the shaft
assembly, taking care not to damage the shaft sleeves
(#42A) keeping the vortex suppressor at the top, 12
o’clock position. Install packing per INSTALLING
STUFFING BOX PACKING on Page 26.
13. Slide the gland assemblies (#71A) and the bearing
arms (#86N & #86P) onto the shaft (#41A) simultaneously and secure bearing arm (#86N) to stuffing boxes
(#1B) with four cap screws. Secure and tighten the
glands (#71A) with the gland nuts (#72C) as described
in Section INSTALLING STUFFING BOX PACK-
19. Heat the inboard ball bearing (#81P) to approximately 212°F (100°C) using a bearing hot plate or
lubricating oil bath.
Do not exceed 248°F (120°C). Temperatures in excess of this will
permanently damage ball bearing.
20. Cool the bearing (#81P) to room temperature and
coat both sides with two to three ounces of recommended grease.
21. Coat the inside of the bearing housing (#82N) with
grease and slide into place over the bearing (#81N).
Slight tapping of the bearing housing may be necessary
as there are fairly tight tolerances between the bearing
(#81N) and the bearing housing (#82N). Secure the
bearing housing (#82N) to the bearing arm (#86N)
with the four hex head capscrews (384B).
Pull Gasket Tight Against Studs
ING on Page 26.
14. Slide the bearing adapters (#45A) onto the shaft.
Press the oil lipseals (#104N & #104P) into the seal
chambers (#1B).
15. Heat the outboard ball bearing (#81N) to approximately 212°F (100°C) using a bearing hot plate or
lubricating oil bath.
Trim
Gasket
Trim
Gasket
Do not exceed 248°F (120°C). Temperatures in excess of this will
permanently damage ball bearing.
16. Slide the heated bearing (#81N) onto the shaft
(#41A) until it abuts the bearing adapter (#45A). Place
the lockwasher (#91N) onto the shaft (#41A) and lock
the bearing locknut (#89N) tight against the bearing
(#81N).
Pull Gasket Tight Against Studs
22. Place the casing gaskets (#353A) on the pump
casing half (#1A). Pull the gaskets tight against the
casing studs (#381B). Trim the four areas of the gasket
(#353A) where the stuffing box o-ring (#331D) meets
the gasket (#353A) flush with the casing (#1A). See
Figure 13. Remove the gaskets.
17. Cool the bearing to room temperature and coat
both sides with two to three ounces of recommended
grease.
18. Coat the inside of the bearing housing (#82N) with
IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
25
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Installation, Operation & Maintenance Manual
FIGURE 13 – Casing Gasket Orientation
FIGURE 14 – Casing Nut Torque Values
23. Set the rotating assembly into the bottom half of
the casing (#1A). Align the pins (#16A) for the case
wear rings (#15A) and the pins (#16B) for the stuffing
boxes (#1B) so the rotor assembly drops down into the
lower half of the casing (#1A). Ensure that the stuffing box o-rings (#331D) are not pinched or buckled.
Check to make sure the impeller (#11D) is located in
a central position within the casing (#1A) and between
the case wear rings (#15A). The rotor assembly should
rotate freely at this point. If this is not the case, the
binding point must be located and eliminated. Disassembly of the rotor assembly may need to occur. If
the impeller (#11D) is not located properly within the
casing (#1A), the shaft sleeves (#42A) may need to be
shifted to reorient the impeller (#11D) (left or right).
24. Install the gaskets (#353A) with a light spot of
RTV fast curing silicone at the inner edge where the
casing gasket (#353A) meets the stuffing box o-ring
(#331D). This will assure a good seal. It is imperative
that the case gasket (#353A) is cut flush with the bore
in the casing (#1A). If the case gasket (#353A) is not
cut and installed in contact with the stuffing box o-ring
(#331D) water could leak around this o-ring (#331D).
25. Lower the upper half of the casing (#1A) into place
and install the casing nuts (#381B).
26. Insert the casing joint dowels. Tighten the casing
nuts (#381B) to the proper torque rating per the following table.
BOLT SIZE
Metric
Standard
5 mm
3/16”
4 mm
6 mm
7 mm
8 mm
9 mm
10 mm
12 mm
14 mm
5/32”
1/4”
9/32”
5/16”
11/32”
3/8”
1/2”
9/16”
TIGHTENING
TORQUE
Lbf-ft
Nm
5.2
7.0
2.7
8.9
14.6
21.8
28.0
38.7
65.6
99.6
3.6
12.0
19.8
29.6
38.0
52.5
89.0
135
16 mm
5/8”
151
205
20 mm
3/4”
264
358
18 mm
22 mm
11/16”
7/8”
24 mm
15/16”
www.american-marsh.com
190
321
411
257
435
557
27. Install external flush piping, if supplied. Rotate the
shaft by hand to assure smooth turning and that it is
free from rubbing or binding.
INSTALLING STUFFING BOX PACKING
Refer to Figure 15 for number of packing rings required by
pump model.
If packing is to be cut from a coil or long length:
1. Wrap the packing around a dummy shaft, equal to
the shaft sleeve diameter.
2. To assist in cutting rings, two guides lines parallel to
the shaft axis and separated by a distance equal to the
packing section may be drawn on the spiral.
3. Cut the rings from the spiral at an angle of 45° diagonally across the guide lines. No gap is left between
the ends.
Insert the first ring and tap it to the bottom of the stuffing box.
Each following ring should be installed in the same manner and
positioned in the stuffing box so that the split is advanced 90°.
Install the lantern ring in its proper position to align with the
internal flush connection allowing for movement of the ring
deeper into the box as the packing is compressed.
When the correct number of rings have been inserted, the last
packing ring should not protrude past the stuffing box face, so
that the gland may be properly started in the stuffing box bore.
Bring the gland follower up squarely against the last packing
ring and tighten the nuts evenly to finger pressure. Turn the
shaft to ensure it does not bind on the bore of the gland assembly.
Pressurize the stuffing box, ensuring air is not trapped. A
packed gland must leak and leakage should take place commencing soon after the stuffing box is pressurized.
Until steady leakage takes place, the pump may overheat. If this
happens, the pump must be stopped and allowed to cool and,
when re-started, leakage should take place. If it does not, this
operation should be repeated. Gland nuts (#72C) should not be
slackened.
After the pump has been running for ten (10) minutes with
steady leakage, tighten the gland nuts (#72C) by one sixth of
a full turn. Continue to adjust at ten (10) minutes intervals,
each time evenly by one sixth of a full turn, until the leaking is
reduced to an acceptable level.
26
IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
Installation, Operation & Maintenance Manual
Pump Model
2.5x3-10 HD
3x4-10 HD
4x6-10 HD
5x6-10 HD
6x8-10 HD
10x10-10 HD
5x6-11 HD
3x4-12 HD
4x5-12 HD
5x6-12 HD
6x8-12 HD
8x10-12 HD
10x10-12 HD
2x3-15 HD
3x4-15 HD
4x5-15 HD
5x6-15 HD
6x8-15 HD
8x10-15 HD
10x12-15 HD
4x5-18 HD
5x6-18 HD
6x8-18 HD
8x10-18 HD
10x12-18 HD
Stuffing Box Information
Bore
2.559
2.559
3.347
2.559
2.559
3.347
2.559
2.559
2.559
2.559
3.347
3.347
3.347
2.559
2.559
3.347
3.347
3.347
3.937
3.937
3.347
3.937
3.937
3.937
3.937
Depth
2.362
2.362
2.756
2.362
2.362
2.795
2.362
2.362
2.362
2.362
2.795
2.795
2.795
2.362
2.362
2.756
2.795
2.795
2.913
2.913
2.795
2.913
2.913
2.913
2.913
Packing
To change rotation, the changes in the assembly procedure are
as follows:
8 - 3/8” SQ
1. Place new shaft sleeve o-rings (#331C) onto shaft
sleeves (#41A).
8 - 1/2” SQ
2. Wipe over shaft (#41A) with clean light oil. Screw
shaft sleeve (#42A) onto shaft (#41A) at the outboard
location until the non threaded end of the shaft sleeve
(#41A) is properly lined up with the step on the shaft
(#41A). See Figure 16.
8 - 3/8” SQ
8 - 3/8” SQ
8 - 3/8” SQ
8 - 1/2” SQ
8 - 3/8” SQ
8 - 3/8” SQ
3. Place impeller key (#24A) into shaft keyway and tap
milled-down end under the shaft sleeve (#42A).
8 - 3/8” SQ
4. Check impeller (#11D) for correct rotation (See
Figure 11 or 15) and slide onto shaft (#41A) from
inboard end.
8 - 3/8” SQ
8 - 1/2” SQ
8 - 1/2” SQ
8 - 1/2” SQ
5. Screw the second shaft sleeve (#42A) onto the shaft
(#41A) locking it tight up against the impeller (#11D)
and the first shaft sleeve (#42A).
8 - 3/8” SQ
8 - 3/8” SQ
8 - 1/2” SQ
8 - 1/2” SQ
8 - 1/2” SQ
The rest of the assembly procedure remains unchanged from the
Right-Hand procedure above.
8 - 1/2” SQ
8 - 1/2” SQ
8 - 1/2” SQ
8 - 1/2” SQ
8 - 1/2” SQ
8 - 1/2” SQ
8 - 1/2” SQ
FIGURE 15 – Stuffing Box Information
Excessive gland pressure will cause damage by cutting off lubrication to the packing and packing will burn and damage the shaft
sleeve.
LEFT-HAND ROTATION
Reversing rotation of pumps from right-hand to left-hand puts
the suction and discharge of the pump on opposite sides with
respect to the inboard end. The reversing of rotation DOES
NOT change how and in what direction the impeller rotates
with respect to the volute of the casing.
IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
27
www.american-marsh.com
Installation, Operation & Maintenance Manual
Z
Mechanical Seal
Packed
2.5x3-10 HD
8.000
11.312
4x6-10 HD
10.188
6x8-10 HD
10.125
Pump Model
3x4-10 HD
5x6-10 HD
10x10-10 HD
5x6-11 HD
8.000
10.125
12.625
8.000
3x4-12 HD
4x5-12 HD
8.000
8.000
5x6-12 HD
10.125
8x10-12 HD
12.625
6x8-12 HD
10x10-12 HD
2x3-15 HD
3x4-15 HD
10.188
12.625
8.000
8.000
4x5-15 HD
10.188
6x8-15 HD
10.188
5x6-15 HD
8x10-15 HD
10x12-15 HD
4x5-18 HD
5x6-18 HD
6x8-18 HD
8x10-18 HD
10x12-18 HD
10.188
13.188
13.188
10.188
13.125
12.938
13.188
15.688
A – Inches
11.312
14.188
13.438
13.438
16.500
11.312
11.312
11.312
13.438
14.188
16.500
16.500
11.312
11.312
14.188
14.188
14.188
16.688
16.688
14.188
16.688
16.688
16.688
16.688
FIGURE 16 – Left-Hand Shaft Sleeve Dimensions
www.american-marsh.com
28
IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
Installation, Operation & Maintenance Manual
APPENDIX A
2. Repair or replacement of the seals is only necessary
when excessive oil leakage is evident. However, if for
any other reason, the bearing housing is to be disassembled or the pump shaft removed, it is recommended
that the rotor “O” rings (which seal on the shaft) be
replaced. Spare or replacement “O” rings may be obtained from “Inpro” distributors.
AMERICAN-MARSH HD MAINTENANCE INSTRUCTIONS BEARING
HOUSING OIL SEALS (LABYRINTH
TYPE) INPRO/SEAL® VBXX BEARING
ISOLATORS
The “Inpro” VBXX bearing isolator is a one piece assembly. The rotor must not pull out of the stator. If the
rotor can be removed, the complete seal assembly must
be replaced.
INTRODUCTION
American-Marsh Pumps provides pumps fitted with a variety of
labyrinth oil seals. While these instructions are written specifically for the Inpro/Seal VBXX labyrinth, they also apply to
seals of other manufacturers. Specific installation instructions
included with the seal, regardless of manufacturer, should be
observed.
3. If the bearing arm with bronze VBXX seals is
washed or cleaned using a caustic type bath, the bronze
material may discolor (turn black). If this happens, the
complete seal assembly must be replaced. Note: This
may occur if the housing is left in a caustic bath over a
long period of time (more than 8 hours).
The Inpro “VBXX” Bearing Isolator is a labyrinth type seal
which isolates the bearings from the environment (uncontaminated), and retains the oil in the bearing housing. The bearing
isolator consists of a rotor and a stator. The rotor revolves with
the shaft, driven by a close fitted drive ring that rotates with
the shaft. The stator is a stationary component that fits into
the housing bore with a press fit (nominal 0.002 in (0.05 mm)
interference) and with an “O” ring gasket seal. The two pieces
are assembled as a single unit, and are axially locked together by
an “O” ring. There is no mechanical contact between the rotor
and stator when the isolator is running.
4. To remove the VBXX bearing isolator:
A. Remove the pump shaft as described in the pump disassembly instructions.
B. From the inside of the bearing arm (#86N &
86P), place a bar (made from a soft material such as
wood or plastic) against the inside face of the seal.
Push the seal out by tapping the bar with a soft mallet or an arbor press.
5. To install a new VBXX bearing isolator, in the outboard or inboard bearing arm:
A. Position the outboard seal in the bore of the bear
ing arm (#86N & 86P) with the single expulsion port
at the 6 o’clock position, (carefully keep aligned with
the bore).
B. The seal stator O.D. press fits into the bore. Use an arbor press. Place a block or bar (large enough to protect the rotor flange) between the arbor press ram and seal face. Press the seal down into the bore stop
ping at the shoulder on the stator O.D.
FIGURE 17 – Bearing Isolator
The VBXX is not intended to be separated from the bearing arm
unless being replaced.
The elastomer “O” ring acts as a gasket to ensure damming
up of small imperfections in the housing bore. The “O” ring is
designed to be compressed to the point of overfilling its groove.
The overfilled material is sheared off during assembly. Remove
any sheared “O” ring material which may extrude from the bore.
1. If the VBXX is removed from the housing, for any
reason, it must be replaced with a new VBXX to ensure
a perfect seal with the housing bore.
IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
29
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Installation, Operation & Maintenance Manual
Pump
Model
Module
Sleeve
Diameter
2.5x3-10 HD
1
3x4-10 HD
1
4x6-10 HD
Packed Orientation
Mechanically Sealed Orientation
Nearest
Obstruction
A
B
C
D
E
1.750
2.250
2.559
2.362
1.329
1.299
1.750
2.250
559
2.362
1.329
1.299
4
2.375
2.625
3.346
2.755
1.496
5x6-10 HD
3
1.750
2.250
2.559
2.362
6x8-10 HD
3
1.750
2.250
2.559
10x10-10 HD
6
2.375
2.625
5x6-11 HD
2
1.750
3x4-12 HD
1
1.750
4x5-12 HD
2
5x6-12 HD
F
G
H
J
K
L
M
0.276
¼”- 18
4.330
3/8” - 16
1.937
2.500
2.953
0.437
0.276
¼” - 18
4.330
3/8” - 16
1.937
2.500
2.953
0.437
1.594
0.453
¼” - 18
5.512
½” - 13
2.563
3.250
3.858
0.500
1.329
1.280
0.591
¼” - 18
4.330
3/8” - 16
1.937
2.500
2.953
0.437
2.362
1.329
1.280
0.591
¼” - 18
4.330
3/8” - 16
1.937
2.500
2.953
0.437
3.346
2.795
1.496
1.575
0.846
¼” - 18
5.512
½” - 13
2.563
3.250
3.565
0.500
2.250
2.559
2.362
1.329
1.329
0.276
¼” - 18
4.330
3/8” - 16
1.937
2.500
2.953
0.437
2.250
2.559
2.362
1.329
1.299
0.276
¼” - 18
4.330
3/8” - 16
1.937
2.500
2.953
0.437
1.750
2.250
2.559
2.362
1.329
1.329
0.276
¼” - 18
4.330
3/8” - 16
1.937
2.500
2.953
0.437
3
1.750
2.250
2.559
2.362
1.329
1.280
0.591
¼” - 18
4.330
3/8” - 16
1.937
2.500
2.953
0.437
6x8-12 HD
5
2.375
2.625
3.346
2.795
1.575
1.574
0.414
¼” - 18
5.512
½” - 13
2.563
3.250
3.858
0.500
8x10-12 HD
6
2.375
2.625
3.346
2.795
1.496
1.575
0.846
¼” - 18
5.512
½” - 13
2.563
3.250
3.565
0.500
10x10-12 HD
6
2.375
2.625
3.346
2.795
1.496
1.575
0.846
¼” - 18
5.512
½” - 13
2.563
3.250
3.565
0.500
2x3-15 HD
2
1.750
2.250
2.559
2.362
1.329
1.329
0.276
¼” - 18
4.330
3/8” - 16
1.937
2.500
2.953
0.437
3x4-15 HD
2
1.750
2.250
2.559
2.362
1.329
1.329
0.276
¼” - 18
4.330
3/8” - 16
1.937
2.500
2.953
0.437
4x5-15 HD
4
2.375
2.625
3.346
2.755
1.496
1.594
0.453
¼” - 18
5.512
½” - 13
2.563
3.250
3.858
0.500
5x6-15 HD
5
2.375
2.625
3.346
2.795
1.575
1.574
0.414
¼” - 18
5.512
½” - 13
2.563
3.250
3.858
0.500
6x8-15 HD
5
2.375
2.625
3.346
2.795
1.575
1.574
0.414
¼” - 18
5.512
½” - 13
2.563
3.250
3.858
0.500
4x5-18 HD
5
2.375
2.750
3.346
2.795
1.575
1.574
0.414
¼” - 18
5.512
½” - 13
2.563
3.250
3.858
0.500
Figure 18A – Packing/Seal Chamber Details
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30
IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
Installation, Operation & Maintenance Manual
Pump
Model
Module
Sleeve
Diameter
Packed Orientation
Mechanically Sealed Orientation
Nearest
Obstruction
A
B
C
D
E
F
G
H
J
K
L
M
8x10-15 HD
7
3.000
3.750
3.937
2.913
1.574
N/A
1.142
3/8” -18
6.299
½” - 13
3.187
3.875
4.500
0.562
10x12-15 HD
7
3.000
3.750
3.937
2.913
1.574
N/A
1.142
3/8” -18
6.299
½” - 13
3.187
3.875
4.500
0.562
5x8-18 HD
7
3.000
3.750
3.937
2.913
1.574
N/A
1.142
3/8” -18
6.299
½” - 13
3.187
3.875
4.500
0.562
6x8-18 HD
7
3.000
3.750
3.937
2.913
1.574
N/A
1.142
3/8” -18
6.299
½” - 13
3.187
3.875
4.500
0.562
8x10-18 HD
7
3.000
3.750
3.937
2.913
1.574
N/A
1.142
3/8” -18
6.299
½” - 13
3.187
3.875
4.500
0.562
Figure 18B – Packing/Seal Chamber Details
IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
31
www.american-marsh.com
Installation, Operation & Maintenance Manual
82N
89N
91N
Item
Number
1A
1B
11D
15A
16A
16B
24A
41A
42A
45A
71A
72C
73A
81N
81P
82N
82P
81N
73A
384C
411D
104N
72C
441A
86N
42A
16B
16A
24A
1A
15A
81P
331A
331D
11D
86P
331C
104P
71A
1B
82P
281A
86P
45A
HD Packed Sectional Drawing
Item Description
Casing, Complete
Stuffing Box
Impeller
Case Wear Ring
Dowel Pin
Dowel Pin
Impeller Key
Shaft
Shaft Sleeve
Bearing Adapter
Gland Assembly, Complete
Hinge Bolt
Lantern Ring
Outboard Bearing, Thrust
Inboard Bearing, Radial
Bearing Housing, Outboard
Bearing Housing, Inboard
Number
Required
Item
Number
2
86P
1
1
2
86N
Bearing Arm, Outboard
89N
Locknut, Outboard
91N*
2
104N
1
281A
2
331B
2
104P
1
331A
2
331C
2
331D
4
353A*
2
381B*
1
384B
1
411A
1
411D
1
Item Description
411B
1
1
Lockwasher, Outboard
1
Lip Seal, Outboard
1
Lip Seal, Inboard
1
Zerk Fitting
2
Packing
1 Set
Mechanical Seal
2
Shaft Sleeve O-Ring
2
Stuffing Box O-Ring
2
Case Gasket
1
Bearing Housing Capscrews
Plug, Vent
Plug, Drain
Plug, Bearing Housing
Number
Required
1
Bearing Arm, Inboard
Casing Capscrew
41A
Varies
8
1
1
1
* Not shown in sectional.
Recommended spare parts are in BOLD.
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32
IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
Installation, Operation & Maintenance Manual
89N
82N
91N
384C
411D
Item
Number
1A
1B
11D
15A
16A
16B
24A
41A
42A
45A
71A
72C
73A
81N
81P
82N
82P
441A
104N
42A
16B
Item Description
Casing, Complete
Stuffing Box
Impeller
Case Wear Ring
Dowel Pin
Dowel Pin
Impeller Key
Shaft
Shaft Sleeve
Bearing Adapter
Gland Assembly, Complete
Hinge Bolt
Lantern Ring
Outboard Bearing, Thrust
Inboard Bearing, Radial
Bearing Housing, Outboard
Bearing Housing, Inboard
* Not shown in sectional.
Recommended spare parts are in BOLD.
IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase
81N
16A
24A
1A
15A
331D
11D
86P
331C
HD Mechanical Sealed Sectional Drawing
Number
Required
Item
Number
2
86P
1
1
2
281A
2
331B
104P
331A
331C
331D
4
353A*
1
384B
2
381B*
1
411A
1
411D
1
411B
33
41A
Item Description
Locknut, Outboard
1
2
1B
89N
104N
2
45A
Bearing Arm, Outboard
2
1
281A
104P
86N
91N*
2
82P
81P
331B
1
Bearing Arm, Inboard
1
1
Lockwasher, Outboard
1
Lip Seal, Outboard
1
Lip Seal, Inboard
1
Zerk Fitting
2
Packing
1 Set
Mechanical Seal
2
Shaft Sleeve O-Ring
2
Stuffing Box O-Ring
2
Case Gasket
Casing Capscrew
1
Bearing Housing Capscrews
Plug, Vent
Plug, Drain
Plug, Bearing Housing
Number
Required
Varies
8
1
1
1
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Installation, Operation & Maintenance Manual
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34
IOM Manual: 077-0209-000
Series 340: Horizontal Splitcase

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