SREM IOM - American

SREM IOM - American
INSTALLATION, OPERATION &
MAINTENANCE MANUAL
FOR
SERIES 320 SREM & SOSM
VERTICAL SUMP PUMPS
07 NOVEMEBR 2008
Copyright  2008 American-Marsh Pumps
ENGINEERED PROCESS GROUP
1
24005
SERIES 320 – SREM & SOSM VERTICAL SUMP
CONTENTS
Page #
SAFETY CONSIDERATIONS ............................................................................................................................................... 4
PUMP IDENTIFICATION....................................................................................................................................................... 5
MANUFACTURER ............................................................................................................................................................. 5
TYPE OF PUMP ................................................................................................................................................................ 5
DATE OF MANUFACTURE ............................................................................................................................................... 5
INSTALLATION, OPERATION & MAINTENANCE MANUAL IDENTIFICATION .............................................................. 5
NAMEPLATE INFORMATION ........................................................................................................................................... 5
WARRANTY .......................................................................................................................................................................... 6
GENERAL INSTRUCTIONS ................................................................................................................................................. 6
HANDLING AND TRANSPORT............................................................................................................................................ 6
METHOD OF TRANSPORT ............................................................................................................................................... 6
INSTALLATION.................................................................................................................................................................. 6
STORAGE ............................................................................................................................................................................. 6
SHORT-TERM STORAGE ................................................................................................................................................. 6
LONG-TERM STORAGE ................................................................................................................................................... 7
INSTALLATION & ALIGNMENT .......................................................................................................................................... 7
FACTORY PRELIMINARY ALIGNMENT PROCEDURE................................................................................................... 7
RECOMMENDED PROCEDURE FOR BASE PLATE INSTALLATION & FINAL FIELD ALIGNMENT ............................ 8
NEW GROUTED BASE PLATES ................................................................................................................................... 8
EXISTING GROUTED BASE PLATES .......................................................................................................................... 9
PIPING CONNECTION – SUCTION & DISCHARGE ........................................................................................................ 9
SUCTION PIPING .......................................................................................................................................................... 9
DISCHARGE PIPING ................................................................................................................................................... 10
PUMP AND SHAFT ALIGNMENT CHECK ...................................................................................................................... 10
IMPELLER CLEARANCES .............................................................................................................................................. 10
MECHANICAL SEAL........................................................................................................................................................ 10
PACKING ......................................................................................................................................................................... 10
PIPING CONNECTION –SEAL/PACKING SUPPORT SYSTEM ..................................................................................... 11
BEARING LUBRICATION ................................................................................................................................................ 11
GREASE LUBRICATED BEARINGS ........................................................................................................................... 11
DRIVER BEARINGS .................................................................................................................................................... 11
COUPLING ...................................................................................................................................................................... 11
PUMP OPERATION ............................................................................................................................................................ 11
ROTATION CHECK ......................................................................................................................................................... 11
PRE START-UP CHECKS ............................................................................................................................................... 11
ENSURING PROPER NPSHA .......................................................................................................................................... 12
MINIMUM FLOW .............................................................................................................................................................. 12
STARTING THE PUMP AND ADJUSTING FLOW ........................................................................................................... 12
OPERATION IN SUB-FREEZING CONDITIONS............................................................................................................. 13
SHUTDOWN CONSIDERATIONS ................................................................................................................................... 13
TROUBLESHOOTING ..................................................................................................................................................... 13
MAINTENANCE .................................................................................................................................................................. 18
PREVENTIVE MAINTENANCE ....................................................................................................................................... 18
NEED FOR MAINTENANCE RECORDS ......................................................................................................................... 18
NEED FOR CLEANLINESS ............................................................................................................................................. 18
ENGINEERED PROCESS GROUP
24005
2
SERIES 320 – SREM & SOSM VERTICAL SUMP
DISASSEMBLY................................................................................................................................................................ 18
SREM & SOSM MODELS ............................................................................................................................................ 18
CLEANING/INSPECTION ................................................................................................................................................ 19
ASSEMBLY ...................................................................................................................................................................... 19
SREM & SOSM THRUST BEARING ASSEMBLY............................................................................................................ 21
BEARING INSTALLATION ........................................................................................................................................... 21
LABYRINTH SEALS ..................................................................................................................................................... 22
SREM & SOSM WET END ASSEMBLY ........................................................................................................................... 22
PUMP REINSTALLATION ............................................................................................................................................... 23
SPARE PARTS ................................................................................................................................................................... 23
RECOMMENDED SPARE PARTS – STANDARD SREM & SOSM PUMP ...................................................................... 23
HOW TO ORDER SPARE PARTS ................................................................................................................................... 23
APPENDIX B ....................................................................................................................................................................... 24
AMERICAN-MARSH SREM & SOSM MAINTENANCE INSTRUCTIONS BEARING HOUSING OIL SEALS (LABYRINTH
TYPE) INPRO/SEAL® VBXX BEARING ISOLATORS...................................................................................................... 24
INTRODUCTION .......................................................................................................................................................... 24
ENGINEERED PROCESS GROUP
3
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SERIES 320 – SREM & SOSM VERTICAL SUMP
completely. During winter months and cold weather, the
liquid could freeze and damage the pump casing.
SAFETY CONSIDERATIONS
The American-Marsh SREM & SOSM vertical process
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 pump. 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 (casing flooded).
Remember that every pump has the potential to be
dangerous, because of the following factors:
Never operate the pump with a closed suction valve.
Never operate the pump 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.
Excessive pump noise or vibration may indicate a
dangerous operating condition. The pump must be
shutdown immediately.
• 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
Do not operate the pump for an extended period of time
below the recommended minimum flow. See Figure 4,
page 12.
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:
The pump shaft MUST turn clockwise when viewed from
the motor end. It is absolutely essential that the rotation
of the motor be checked before installation of the
coupling spacer and starting the pump. Incorrect rotation
of the pump for even a short period of time can unscrew
the impeller nut, which can cause severe damage.
If the liquid is hazardous, take all necessary precautions
to avoid damage and injury before emptying the pump
casing.
DANGER - Immediate hazards which WILL result in
severe personal injury or death.
Residual liquid may be found in the pump casing, head
and suction line. Take the necessary precautions if the
liquid is hazardous, flammable, corrosive, poisonous,
infected, etc.
Always lockout power to the driver before performing
pump maintenance.
WARNING – Hazards or unsafe practices which
COULD result in severe personal injury or death.
Never operate the pump without the coupling guard 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.
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 casing could freeze,
never leave liquid in the pump casing. Drain the casing
ENGINEERED PROCESS GROUP
4
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SERIES 320 – SREM & SOSM VERTICAL SUMP
DATE OF MANUFACTURE
PUMP IDENTIFICATION
The date of manufacture is indicated on the pump data
plate.
MANUFACTURER
INSTALLATION, OPERATION &
MAINTENANCE MANUAL IDENTIFICATION
American-Marsh Pumps
185 Progress Road
Collierville, TN 38017
United States of America
Prepared: May, 2005
Revision: November, 2008
Edition: 04
Date of Revision:
11/07/2008
TYPE OF PUMP
The American-Marsh SREM & SOSM vertical process
pumps are end suction, single stage centrifugal pumps.
SREM & SOSM pumps are of the vertical, wet pit type.
NAMEPLATE INFORMATION
FIGURE 1 – Pump Data Plate
SERIAL NUMBER
SIZE
TYPE
RPM
GPM
TDH
:
:
:
:
:
:
Serial Number of pump unit (issued by Production Control).
Size designation of pump (3x4-10 SREM)
Pump type (SREM).
Speed of pump.
Rated capacity of pump.
Rated Total Dynamic Head of pump.
ENGINEERED PROCESS GROUP
5
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SERIES 320 – SREM & SOSM VERTICAL SUMP
In case of doubt, contact the manufacturer.
WARRANTY
HANDLING AND TRANSPORT
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.
METHOD OF TRANSPORT
The pump must be transported in the horizontal position
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.
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.
Replacement of parts or of the pump itself can only be
carried out after careful examination of the pump by
qualified personnel.
The warranty is not valid if third parties have
tampered with the pump.
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.
Maximum lifting speed: 15 feet/second
STORAGE
Parts replaced under warranty become the property of
American-Marsh Pumps.
SHORT-TERM STORAGE
Contact the American-Marsh Pumps’ factory:
American-Marsh Pumps
185 Progress Road
Collierville, TN 38017
United States Of America
Phone:
(901) 860-2300
Fax:
(901) 860-2323
www.american-marsh.com
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.
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
ENGINEERED PROCESS GROUP
6
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 shortterm storage is summarized below:
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).
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,
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SERIES 320 – SREM & SOSM VERTICAL SUMP
flange faces, and the impeller surface are
sprayed with Calgon Vestal Labs RP-743m, or
equal. Exposed shafts are taped with Polywrap.
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.
f. All assemblies are bolted to a wood skid which
confines the assembly within the perimeter of
the skid.
g. Assemblies with special paint are protected with
a plastic wrap.
h. Group 1 and Group 2 bare pumps, when not
mounted on base plates, are packed in hard
paper cartons mounted on wood skids.
i. Group 3 bare pumps, when not mounted on
base plates, are bolted to wood skids.
j. All pump assemblies utilizing polycrete base
plates are mounted on wood skids.
k. 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.
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.
Every three months, the shaft should be rotated
approximately 10 revolutions.
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 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:
LONG-TERM STORAGE
Long-term storage is defined as more than two months,
but less than 12 months. The procedure AmericanMarsh follows for long-term storage of pumps is given
below. These procedures are in addition to the shortterm 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
ENGINEERED PROCESS GROUP
7
1. The base plate is placed on a flat and level
work bench in a free and unstressed
position.
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.
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. The foot piece under the bearing
housing is adjustable. It is used to level the
pump, if necessary. If an adjustment is
necessary, we add or delete shims (#109A)
between the foot piece and the bearing
housing.
7. The spacer coupling gap is verified.
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SERIES 320 – SREM & SOSM VERTICAL SUMP
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.
11. Both horizontal and vertical alignment are
again final checked as is the coupling
spacer gap.
is not likely that the field mounting surface is
flat.
RECOMMENDED PROCEDURE FOR BASE
PLATE INSTALLATION & FINAL FIELD
ALIGNMENT
NEW GROUTED BASE PLATES
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 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.
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
ENGINEERED PROCESS GROUP
FIGURE 2 – Base Plate Foundation
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.
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
8
24005
SERIES 320 – SREM & SOSM VERTICAL SUMP
5.
6.
7.
8.
check to see if the driver mounting fasteners
are centered in the driver feet holes. If not,
recenter 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.
Grout the base plate. A non-shrinking grout
should be used. Make sure that the grout
fills the area under the base plate. After the
grout has cured, check for voids and repair
them. Jackscrews, shims and wedges
should be removed from under the base
plate at this time. If they were to be left in
place, they could rust, swell, and cause
distortion in the base plate.
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.
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.
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.
4. Run piping to the suction and discharge
flanges of the pump. (Step 6 above)
5. Perform final alignment. (Step 7 above)
6. Recheck alignment after pump is hot. (Step
8 above)
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.
PIPING CONNECTION – SUCTION &
DISCHARGE
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.
Piping Forces: Take care during installation and
operation to minimize pipe forces and/or moments on
the pump casing.
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.
2. Level the pump by putting a level on the
discharge flange. If not level, add or delete
shims (#109A) between the foot piece and
the bearing housing.
3. Check initial alignment. (Step 4 above)
ENGINEERED PROCESS GROUP
9
SUCTION PIPING
To avoid NPSH and suction problems, suction pipe sizes
must be at least as large as the pump suction
connection. Never use pipe or fittings on the suction
that are smaller in diameter than the pump suction size.
Figure 3 illustrates the ideal piping configuration with a
minimum of 10 pipe diameters between the source and
the pump suction. In most cases, horizontal reducers
should be eccentric and mounted with the flat side up as
shown in figure 6 with a maximum of one pipe size
reduction. Never mount eccentric reducers with the flat
side down. Horizontally mounted concentric reducers
should not be used if there is any possibility of entrained
air in the process fluid. Vertically mounted concentric
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SERIES 320 – SREM & SOSM VERTICAL SUMP
reducers are acceptable. In applications where the fluid
is completely deaerated and free of any vapor or
suspended solids, concentric reducers are preferable to
eccentric reducers.
PUMP AND SHAFT 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.
Avoid the use of throttling valves and strainers in the
suction line. Start up strainers must be removed shortly
after start up. When the pump is installed below the
source of supply, a valve should be installed in the
suction line to isolate the pump and to permit pump
inspection and maintenance. However, never place a
valve directly on the suction nozzle of the pump.
IMPELLER CLEARANCES
SREM & SOSM model pumps have impeller clearances
that need to be adjusted. The impeller needs to be
adjusted 0.020 inches to 0.030 inches off of the rear
cover. The design and assembly of the thrust bearing
housing ensure that the impeller is placed in the proper
position within the casing assembly. These clearances
are set at the factory and initial setting in the field is not
required.
Refer to the American-Marsh Pump Engineering Manual
and the Centrifugal Pump IOM Section of the Hydraulic
Institute Standards for additional recommendations on
suction piping.
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.
Failure to ensure that a seal is installed may result in
serious leakage of the pumped fluid.
FIGURE 3 – Good Piping Practices
Seal and seal support system must be installed and
operational as specified by the seal manufacturer.
DISCHARGE PIPING
Install a valve in the discharge line. This valve is
required for regulating flow and/or to isolate the pump for
inspection and maintenance.
The stuffing box/seal chamber/gland may have ports that
have been temporarily plugged at the factory to keep out
foreign matter. It is the installer’s responsibility to
determine if these plugs should be removed and external
piping connected. Refer to the seal drawings and/or the
local American-Marsh representative for the proper
connections.
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.
ENGINEERED PROCESS GROUP
PACKING
10
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.
24005
SERIES 320 – SREM & SOSM VERTICAL SUMP
pump. All SREM & SOSM pumps turn clockwise as
viewed from the motor end or, conversely,
counterclockwise when viewed from the suction end.
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.
Failure to ensure that packing is installed may result in
serious leakage of the pumped fluid.
PIPING CONNECTION –SEAL/PACKING
SUPPORT SYSTEM
PUMP OPERATION
ROTATION CHECK
If the pump has a seal support system, it is mandatory
that this system be fully installed and operational before
the pump is started.
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 impeller, casing, shaft and shaft seal.
BEARING LUBRICATION
Reasonable care and proper lubrication of AmericanMarsh Pump bearings will result in many years of
service.
All SREM & SOSM pumps turn clockwise as viewed
from the motor end. A direction arrow is cast on the
front of the casing. Make sure the motor rotates in the
same direction.
GREASE LUBRICATED BEARINGS
SREM & SOSM pumps are supplied with grease packed
bearings and are shipped from the factory pre-lubricated.
Before the pump is started the bearings must be filled
with Royal Purple NLGI #2 or other high quality
equivalent grease.
PRE START-UP CHECKS
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.
DRIVER BEARINGS
Consult the driver manufacturer’s maintenance
instructions for lubricants and re-lubrication procedures
for the driver.
• Pump and Motor properly secured to the base plate
• All fasteners tightened to the correct torques
• Coupling guard in place and not rubbing
• Rotation check, see above
THIS IS ABSOLUTELY ESSENTIAL.
• Shaft seal properly installed
• Seal support system operational
• Bearing lubrication
• Bearing housing cooling system operational
• Impeller clearances properly set
• Pump instrumentation is operational
• Pump is primed
• Rotation of shaft by hand
COUPLING
A direction arrow is cast on the front of the casing
and on the Bearing Housing. Make sure the motor
rotates in the same direction before coupling the
motor to the Pump.
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.
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 impeller which may cause serious damage to the
ENGINEERED PROCESS GROUP
11
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SERIES 320 – SREM & SOSM VERTICAL SUMP
ENSURING PROPER NPSHA
Pump Size
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.
All 5” Impellers
All 7” Impellers
All 8” Impellers
All 10” Impellers
All 13” Impellers
All Other Sizes
RPM
3500
3500
3500
3500
1750
ANY
60 Hz
Minimum
Flow
(% of BEP)
25%
25%
25%
33%
50%
20%
RPM
2900
2900
2900
2900
1450
ANY
50 Hz
Minimum
Flow
(% of BEP)
21%
21%
21%
28%
42%
20%
FIGURE 4 - 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 SREM & SOSM 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 dependent.
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.
Do not operate the pump below Minimum Thermal Flow,
as this could cause an excessive temperature rise.
Contact an American-Marsh Sales Engineer for
determination of Minimum Thermal flow.
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.
STARTING THE PUMP AND ADJUSTING
FLOW
MINIMUM 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.
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. 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 10% 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:
ENGINEERED PROCESS GROUP
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
12
24005
SERIES 320 – SREM & SOSM VERTICAL SUMP
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.
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.
SHUTDOWN CONSIDERATIONS
When the pump is being shutdown, the procedure
should be the reverse of the start-up procedure. First,
slowly close the 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
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.
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.
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.
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.
8. Surging Condition
A rapidly closing discharge valve can cause a
damaging pressure surge. A dampening
arrangement should be provided in the piping.
ENGINEERED PROCESS GROUP
13
24005
SERIES 320 – SREM & SOSM VERTICAL SUMP
PROBLEM
POSSIBLE CAUSE
RECOMMENDED REMEDY
Problem #1
Pump not reaching design flow
rate.
1.1
Insufficient NPSHA. (Noise may not be
present)
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.
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. 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.
1. Reduce length of fiber when possible.
2. Reduce solids in the process fluid
when possible.
3. Consider larger pump.
Replace part or parts.
1.2
System head greater than anticipated.
1.3
Entrained air. Air leak from
atmosphere on suction side.
1.4
Entrained gas from process.
1.5
Speed too low.
1.6
Direction of rotation wrong.
1.7
Impeller too small.
1.8 Plugged impeller, suction line or
casing which may be due to a product
or large solids.
Problem #2.0
Pump not reaching design head
(TDH).
Problem #3.0
No discharge or flow
1.9 Wet end parts (casing cover,
impeller) worn, corroded or missing.
2.1
Refer to possible causes under
Problem #1.0.
3.1
Not properly primed.
3.2
Direction of rotation wrong.
ENGINEERED PROCESS GROUP
14
Refer to remedies listed under Problem
#1.0 and #3.0.
Repeat priming operation, recheck
instructions. If pump has run dry,
disassemble and inspect the pump
before operation.
After confirming wrong rotation, reverse
any two of three leads on a three phase
motor. The pump should be
disassembled and inspected before
operation.
24005
SERIES 320 – SREM & SOSM VERTICAL SUMP
PROBLEM
POSSIBLE CAUSE
RECOMMENDED REMEDY
Cont. Problem #3.0
No discharge or flow
3.3
Entrained air. Air leak from
atmosphere on suction side.
3.4
Plugged impeller, suction line or casing
which may be due to a fibrous product
or large solids.
3.5
Damaged pump shaft, impeller.
4.1
Insufficient NPSH.
Refer to recommended remedy under
Problem #1.0,
Item #1.3.
Refer to recommended remedy under
Problem #1.0,
Item #1.8.
Problem #4.0
Pump operates for short period,
then loses prime.
Problem #5.0
Excessive noise from wet end.
4.2
Entrained air. Air leak from
atmosphere on suction side.
5.1
Cavitation - insufficient NPSH
available.
5.2
Abnormal fluid rotation due to complex
suction piping.
5.3
Impeller rubbing.
Problem #6.0
Excessive noise from power
end.
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.
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.
ENGINEERED PROCESS GROUP
15
Replace damaged parts.
Refer to recommended remedy under
Problem #1.0,
Item #1.1.
Refer to recommended remedy under
Problem #1.0,
Item #1.3.
Refer to recommended remedy under
Problem #1.0,
Item #1.1.
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. Check thrust bearing assembly for
axial end play.
2. Reset impeller clearance.
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.
When mounting the bearing on the drive
shaft 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.
24005
SERIES 320 – SREM & SOSM VERTICAL SUMP
PROBLEM
POSSIBLE CAUSE
RECOMMENDED REMEDY
Cont. Problem #6.0
Excessive noise from power
end.
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.
1. Follow correct mounting procedures
for bearings.
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 SREM & SOSM
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.
ENGINEERED PROCESS GROUP
16
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.
24005
SERIES 320 – SREM & SOSM VERTICAL SUMP
PROBLEM
POSSIBLE CAUSE
RECOMMENDED REMEDY
Cont.: Problem #6.0
Excessive noise from power
end.
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.
1. Be sure the lubricant is clean.
2. Be sure proper amount of lubricant is
used. The constant level oiler supplied
with SREM & SOSM 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.
ENGINEERED PROCESS GROUP
17
24005
SERIES 320 – SREM & SOSM VERTICAL SUMP
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 13. These checks
will help extend pump life as well as the length of time
between major overhauls.
Lock out power to driver to prevent personal injury.
2. Close the discharge and suction valves, and
drain all liquid from the pump.
3. Close all valves on auxiliary equipment and
piping, then disconnect all auxiliary piping.
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.
5. Remove the coupling guard.
6. Remove the spacer from the coupling (if
supplied).
7. Loosen and remove the coupling setscrews
(#30) and remove the coupling from the shaft.
The motor bolts can now be loosened and
removed. Remove the motor from the motor
bracket (#498A), if necessary.
8. Loosen and remove the bolts that hold the
strainer (#424A) to the casing (#1A). Loosen
and remove the bolts that hold the casing (#1A)
to the inboard head (#2B).
9. At this time any lubrication lines from the cover
plate must be removed. The casing (#1A) can
be removed from the inboard head (#2B) by first
removing the discharge pipe assembly. The
discharge assembly consists of the discharge
elbow (#441A) and the discharge pipe (#260A).
Once the discharge pipe assembly has been
removed, remove the bolts from the support pipe
(#280A) and remove the casing (#1A) from the
inboard head (#2B).
10. Inspect the casing (#1A) and the case wear ring
(#15A) for damage. If the casing (#1A) shows
any signs of damage, replace it. If the case
wear ring (#15A) is damage, pry it from the
casing (#1A). Press new case wear ring (#15A)
into casing (#1A) by using equal force around
the case wear ring (#15A) until it is seated
securely in casing (#1A).
11. Loosen the setscrews in the ball bearing adapter
(#92S). With the coupling loose, the shaft
(#41A) and impeller (#11C) assembly can now
be pulled from the pump assembly.
12. Bend the impeller washer (#27A) flat so that the
impeller nut (#24B) can be loosened. Loosen
and remove the impeller nut (#24B) and the
impeller washer (#27A). Discard the impeller
washer (#27A). The impeller (#11A) should be
NEED FOR MAINTENANCE RECORDS
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.
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 impeller threads
could cause the impeller to not be seated properly
against the shaft. 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.
After draining the oil from the bearing housing,
periodically send it out for analysis. 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.
DISASSEMBLY
Refer to the parts list shown in Figures 10 for item
number references used throughout this section.
SREM & SOSM MODELS
1. Before performing any maintenance, disconnect
the driver from its power supply and lock it off
line.
ENGINEERED PROCESS GROUP
18
24005
SERIES 320 – SREM & SOSM VERTICAL SUMP
free to remove from the shaft (#41A). Remove
the impeller key (#24A) from the shaft (#41A).
float rod stops (#307A), the float switch bracket
(#302A) and the float rod box nut (#306A)
assembly. The entire float switch assembly can
be removed from the pump assembly at this
time.
CLEANING/INSPECTION
All parts should now be thoroughly cleaned and
inspected. New bearings, O-rings, gaskets, and lip seals
should be used. Any parts that show wear or corrosion
Do not apply heat to the impeller. If liquid is entrapped
in the hub, an explosion could occur.
13. Loosen and remove the bolts that connect the
inboard head (#2B) to the support column
(#280A). Remove the inboard head (#2B). At
this time the inboard head bushing (#45C) can
be inspected and removed if necessary. Pumps
equipped with intermediate bushings can also
be removed and inspected at this time.
Intermediate bushings consist of the
intermediate bearing housing (#82R) and the
intermediate bearing (#81R).
14. The support column (#280A) can be removed
from the coverplate (#221B) at this time if
necessary.
15. The thrust bearing assembly can now be
removed. Remove the bolts that hold the
bearing housing cap (#85S) to the thrust bearing
housing (#82S). Remove the thrust bearing
adapter (#92S) from the thrust bearing housing
(#82S). The thrust bearing (#81S) can be
removed from the thrust bearing adapter (#92S)
by removing the locknut (#89S) and lockwasher
(#91S).
16. At this time the thrust bearing (#81S) and the
bearing housing cap (#85S) can be removed
and inspected.
17. On units equipped with a stuffing box option, the
gland nuts (#72A) and gland (#71A) can be
removed. At this time the packing (#331A) can
also be removed. The stuffing box (#61A) can
be removed from the cover plate (#221B) if
necessary. The motor pedestal extension
(#499A) can be removed from the cover plate
(#221B) if necessary.
18. The bearing housing (#82S) and the motor
pedestal (#498A) can be removed from the
cover plate (#221B) if necessary.
19. The float switch assembly, if equipped, can be
removed from the cover plate (#221B) by
removing the bolts that hold the float switch
bracket to the cover plate (#221B).
20. The float switch assembly consists of the float
switch (#301A), the float (#309A), the float rod
guide (#304A), the float rod (#303A), the four
ENGINEERED PROCESS GROUP
should be replaced with new genuine American-Marsh
parts.
It is important that only non-flammable, noncontaminated cleaning fluids are used. These fluids
must comply with plant safety and environmental
guidelines.
ASSEMBLY
Note: Refer to Figure 5 for all bolt torque information.
It is very important that all pipe threads be sealed
properly. PTFE tape provides a very reliable seal over a
wide range of fluids, but it has a serious shortcoming if
not used properly. If, during application to the threads,
the tape is wrapped over the end of the male thread,
strings of the tape will be formed off when threaded into
the female fitting. This string can then tear away and
lodge in the piping system. If this occurs in the seal
flush system, small orifices can become blocked
effectively shutting off flow. For this reason, AmericanMarsh does not recommend the use of PTFE tape as a
thread sealant.
American-Marsh has investigated and tested alternate
sealants and has identified two that provide an effective
seal, have the same chemical resistance as the tape,
and will not plug flush systems. These are La-co SlicTite
and Bakerseal. Both products contain finely ground
PTFE particles in an oil based carrier. They are supplied
in a paste form which is brushed on the male pipe
threads. American-Marsh recommends using one of
these paste sealants.
Full thread length engagement is required for all
fasteners.
19
24005
SERIES 320 – SREM & SOSM VERTICAL SUMP
BOLT SIZE
TIGHTENING TORQUE
Metric
Standard
Lbf ft
Nm
4 mm
5 mm
6 mm
7 mm
8 mm
9 mm
10 mm
12 mm
14 mm
16 mm
18 mm
20 mm
22 mm
24 mm
5/32”
3/16”
1/4”
9/32”
5/16”
11/32”
3/8”
1/2”
9/16”
5/8”
11/16”
3/4”
7/8”
15/16”
2.7
5.2
8.9
14.6
21.8
28.0
38.7
65.6
99.6
151
190
264
321
411
3.6
7.0
12.0
19.8
29.6
38.0
52.5
89.0
135
205
257
358
435
557
FIGURE 5 - Bolt & Cap Screw Torque Ratings
ENGINEERED PROCESS GROUP
20
24005
SERIES 320 – SREM & SOSM VERTICAL SUMP
The chart shown in Figure 6 gives the SKF part numbers
for bearings in American-Marsh SREM & SOSM pumps.
SREM & SOSM THRUST BEARING
ASSEMBLY
BEARING INSTALLATION
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.
Model
Type of Bearings
1.25x2-5 SREM
1.25x2-7 SREM
1.25x2-8 SREM
1.5x2.5-5 SREM
1.5x2.5-7 SREM
1.5x2.5-8 SREM
2x2.5-5 SREM
2x2.5-7 SREM
2x2.5-8 SREM
2.5x3-5 SREM
2.5x3-8 SREM
1.25x2-10 SREM
1.5x2.5-10 SREM
2x2.5-10 SREM
2.5x3-7 SREM
3x4-7 SREM
1.5x2.5-13 SREM
2x2.5-13 SREM
2.5x3-10 SREM
2.5x3-13 SREM
3x4-8 SREM
3x4-10 SREM
4x5-8 SREM
4x5-10 SREM
4x5-13 SREM
5x6-8 SREM
5x6-10 SREM
5x3-13 SREM
6x8-8 SREM
6x8-13 SREM
3x4-16 SREM
4x5-16 SREM
5x6-16 SREM
6x8-10 SREM
6x8-16 SREM
8x10-10 SREM
8x10-13 SREM
8x10-16 SREM
1. Slide the thrust bearing cap (#85S) and the
thrust bearing housing cap gasket onto the
thrust bearing adapter (#92S). Install the thrust
bearing (#81P) onto the bearing adapter (#92S)
using a press or bearing heater. The thrust
bearing (#81P) must be positioned against the
shoulder on the shaft (#41A). Install the thrust
bearing lockwasher (#91S) and thrust bearing
locknut (#89S).
Thrust Bearing
Regreasable – Single Shielded
Greased for life – Double Shielded
Sealed for life – Double Sealed
6307-ZC3
6307-2ZC3
6307-2RSIC3
Regreasable – Single Shielded
Greased for life – Double Shielded
Sealed for life – Double Sealed
6310-ZC3
6310-2ZC3
6310-2RSIC3
Regreasable – Single Shielded
Greased for life – Double Shielded
Sealed for life – Double Sealed
6312-ZC3
6312-2ZC3
6312-2RSIC3
Regreasable – Single Shielded
Greased for life – Double Shielded
Sealed for life – Double Sealed
6314-ZC3
6314-2ZC3
6314-2RSIC3
FIGURE 6 – AMP SREM & SOSM Bearings
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.
ENGINEERED PROCESS GROUP
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SERIES 320 – SREM & SOSM VERTICAL SUMP
BEARING INSTALLATION
FOR POWER END ASSEMBLY (CONT’D)
3. If the thrust bearing is cold pressed against the
shaft shoulder, it should be pressed onto the
shaft with the forces listed in Figure 7.
4. The thrust bearing adapter assembly, consisting
of the thrust bearing adapter (#92S), the thrust
bearing housing cap (#85S), the thrust bearing
lockwasher (#91S), the thrust bearing locknut
(#89S) and the thrust bearing housing gasket,
can now be installed into the thrust bearing
housing (#82S) by pressing into position. Install
four capscrews to secure the thrust bearing
housing cap (#85S) to the thrust bearing
housing (82S).
5. Install two set screws into thrust bearing adapter
(#92S) to secure shaft (#41A) later during
assembly.
6. Press the thrust bearing housing oil lip seal
(#100N) into the bottom of the thrust bearing
housing (#82R).
7. Mount the thrust bearing housing assembly to
the cover plate (#221A).
The thrust bearing has a slight interference fit
which requires that they be pressed on the shaft
with an arbor or hydraulic press. Even force
should be applied to the inner race only. Never
press on the outer race, as the force will
damage the balls and races. An alternate
method of installing bearings is to heat the
bearings to 200°F (93°C) in an oven or induction
heater. Then place them quickly in position on
the shaft.
Never heat the bearings above 230°F (110°C). To do so
will likely cause the bearing fits to permanently change,
leading to early failure.
LABYRINTH SEALS
Refer to Appendix A.
2. Using clean gloves, install the thrust bearing
(#121) firmly against the shaft shoulder. If hot
bearing mounting techniques are used, steps
must be taken to ensure the outboard bearing is
firmly positioned against the shaft shoulder. The
outboard bearing, while still hot, is to be
positioned against the shaft shoulder. After the
bearing has cooled below 100°F (38°C) the
bearing should be pressed against the shaft
shoulder. An approximate press force needed
to seat the bearing is listed in Figure 19. This
value may be used if the press has load
measuring capability.
SREM & SOSM WET END ASSEMBLY
Refer to the appropriate section according to
construction details.
8. Mount the appropriate support pipe (#280A) and
intermediate bearing housings (#82R), with
intermediate bearings (#81R), in the proper
sequence to the cover plate (#221B).
9. Mount the inboard head (#2B), with inboard
head bearing (#45C) to the bottom support pipe.
10. Install the impeller key (#24A) onto the shaft
(#41A). Mount the impeller (#11C) to the shaft
assembly (#41A) and secure with impeller lock
washer (#27A) and locknut (#24B).
11. Slide the impeller and shaft assembly through
the inboard head bearing and through the
intermediate bearings ensuring that the shaft
clears the cover plate (#221B).
12. Ensure that the impeller (#11C) has ample
clearance off of the inboard head (#2B)
(approximately 0.020 inches to 0.030 inches)
and lock rotor assembly to thrust bearing
housing assembly using set screws located in
the thrust bearing adapter (#92S). Ensure that
the rotating assembly is free to rotate 360º.
13. Dimple the motor shaft at one of the set screw
locations (#47A). Install all shaft set screws
(#47A) by applying a small amount of blue
Loctite on the threads. Torque the set screws
(#47A) to the appropriate values listed in Figure
8.
It must be understood that fixtures and equipment used
to press the bearing must be designed so no load is ever
transmitted through the bearing balls. This would
damage the bearing.
Bearing
Size
6307
6310
Press Force
lbf (N)
1300 (5,780)
6312
2500 (11,100)
6314
4500 (20,000)
FIGURE 7 – Bearing Press Force
ENGINEERED PROCESS GROUP
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SERIES 320 – SREM & SOSM VERTICAL SUMP
Size
in.
0.2500
0.3125
0.3750
0.4375
0.5000
0.5625
0.6250
0.7500
0.8750
1.0000
Seating
Torque
in.-lbs.
87
165
290
430
620
620
1325
2400
5200
7200
and the cost of the spare part. Figure 10 give the parts
list for a typical SREM & SOSM pumps.
Holding
Power
lb.
1000
1500
2000
2500
3000
3500
4000
5000
6000
7000
HOW TO ORDER SPARE PARTS
Spare parts can be ordered from the local AmericanMarsh Sales Engineer, or from the American-Marsh
Distributor or Representative. The pump size and type
can be found on the name plate on the motor stand.
See Figure 3. Please provide the item number,
description, and alloy for the part(s) to be ordered.
To make parts ordering easy, American-Marsh has
created a catalog titled “American-Marsh Pump Parts
Catalog.” A copy of this book can be obtained from the
local American-Marsh Sales Engineer or
Distributor/Representative.
Based on alloy steel set screw against steel
shaft, class 3A course or fine threads in class
2B holes and cup point socket set screws.
FIGURE 8 – Bearing Press Force
14. Install casing o-ring (#351C) onto the register of
the inboard head (#2B). Place the casing up
onto the rear cover (#2B) and tighten casing cap
screws. The rotating assembly MUST be able to
rotate freely the entire 360º. If this is not the
case, the pump MUST be disassembled and
inspected.
15. Install the suction strainer (#424A) if supplied.
16. Mount the discharge elbow (#441A) to the
casing discharge flange.
17. Mount the discharge pipe (#260A) to the
discharge elbow (#441A). Newer SREM &
SOSM models have the discharge pipe (#260A)
welded to the surface plate (#221B).
18. The float switch assembly consists of the float
switch (#301A), the float (#309A), the float rod
guide (#304A), the float rod (#303A), the four
float rod stops (#307A), the float switch bracket
(#302A) and the float rod box nut (#306A)
assembly. The entire float switch assembly can
be re-installed to the pump assembly at this
time.
PUMP REINSTALLATION
The pump is now ready to be returned to service. It
should be reinstalled as described in the installation
section.
SPARE PARTS
RECOMMENDED SPARE PARTS –
STANDARD SREM & SOSM PUMP
The decision on what spare parts to stock varies greatly
depending on many factors such as the criticality of the
application, the time required to buy and receive new
spares, the erosive/corrosive nature of the application,
ENGINEERED PROCESS GROUP
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SERIES 320 – SREM & SOSM VERTICAL SUMP
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.
APPENDIX B
AMERICAN-MARSH SREM & SOSM
MAINTENANCE INSTRUCTIONS BEARING
HOUSING OIL SEALS (LABYRINTH TYPE)
INPRO/SEAL® VBXX BEARING ISOLATORS
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.
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.
5.
FIGURE 9 – Bearing Isolator
The VBXX is not intended to be separated from the
bearing housing/adapter/carrier unless being replaced.
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.
ENGINEERED PROCESS GROUP
6.
24
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.
If the bearing housing or bearing carrier 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).
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 housing
or bearing carrier, 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.
To install a new VBXX bearing isolator, in the
impeller end of the bearing housing/adapter:
A. Position the impeller end (inboard) seal
in the bore of the adapter or bearing
housing 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 stopping at the shoulder on
the stator O.D.
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.
To install a new VBXX bearing isolator in the
drive end (outboard) side of the bearing carrier:
A. Position the outboard seal in the bore
of the bearing cap (no orientation of the
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SERIES 320 – SREM & SOSM VERTICAL SUMP
multiple expulsion ports is necessary)
and carefully keep aligned with the bore.
If the outboard seal has only one
explusion port, that port must be
oriented at the 6 o’clock position.
Because the bearing carrier rotates for
impeller adjustment, take the necessary
steps to ensure the explusion port is
oriented at 6 o’clock when the pump is
installed and operating.
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 stopping at the shoulder on
the stator O.D. Remove any sheared oring material which may extrude from
the bore.
7. Assemble the bearing carrier/VBXX bearing
isolator on to the shaft:
A. Using sand paper, remove burrs and
break any sharp edges off the keyway at
end of the shaft.
B. It is important to prevent the corners of
the keyway from cutting the “O” rings
during assembly. This can be
accomplished with the use of a half key
or a thin flexible sleeve. Lightly lubricate
the shaft and slide the bearing cap on to
the shaft, pushing on the VBXX rotor,
until the bearing is seated.
C. Check the position of the rotor (make
sure rotor and stator have not
separated) and seat the rotor snugly into
the stator by hand.
ENGINEERED PROCESS GROUP
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24005
SERIES 320 – SREM & SOSM VERTICAL SUMP
FIGURE 10 – SREM & SOSM Sectional
Drawing
ENGINEERED PROCESS GROUP
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24005
SERIES 320 – SREM & SOSM VERTICAL SUMP
SREM & SOSM Sectional Drawing
Item
Item Description
Number
1A
Casing
2B
Head, Upper Casing
11C
Impeller
24A
Key, Impeller
41A
Shaft, Pump
45C
Bearing, Casing Head
61A
Box, Stuffing
71A
Gland, Stuffing Box
72A
Stud, Gland, with Nut
81R
Bearing, Intermediate
81S
Bearing, Ball Thrust
82R
Housing, Intermediate Bearing
82S
Housing, Ball Bearing
85S
Cap, Bearing Housing
89S
Locknut, Ball Bearing
*91S
Lockwasher, Ball Bearing
92S
Adapter, Ball Bearing
100N
Ring, Lube Seal
121A
Coupling, Motor
122A
Coupling, Pump
123A
Disc, Coupling
221A
Plate, Sump Cover
* Not shown in sectional.
Recommended spare parts are in BOLD.
ENGINEERED PROCESS GROUP
Num.
Req.
1
1
1
1
1
1
1
1
2
Varies
1
Varies
1
1
1
1
1
1
1
1
1
1
Item
Number
221B
224A
260A
280A
282A
284A
**301A
302A
303A
304A
305A
306A
307A
309A
331A
*332A
424A
441A
**497A
498A
499A
27
Item Description
Plate, Sump Mounting
Flange, Upper Discharge
Pipe, Discharge, Assembly
Pipe, Support, Assembly
Oiler
Fitting, Zerk Grease
Switch, Float
Bracket, Float Switch
Rod, Float
Guide, Float Rod
Box, Float Rod Stuffing
Gland Nut, Float Rod Box
Stop, Float Rod
Float
Packing, Stuffing Box
Packing, Float Rod Box
Strainer, Suction
Elbow, Discharge
Motor
Pedestal, Motor
Pedestal, Extension
Num.
Req.
1
1
Varies
Varies
Varies
1
1
1
1
1
1
1
4
1
1 set
1 set
1
1
1
1
1
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SERIES 320 – SREM & SOSM VERTICAL SUMP
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ENGINEERED PROCESS GROUP
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24005
SERIES 320 – SREM & SOSM VERTICAL SUMP
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