Centrifugal_IOM_Instructions

Centrifugal_IOM_Instructions
TROUBLESHOOTING MATRIX
Difficulty
No Liquid Delivery
Low Liquid Delivery
OBERDORFER PUMPS
A Subsidiary of Thomas Industries Inc.
Bronze or Aluminum Centrifugal Pumps
Probable Cause
Remedy
Closed Valves
Open Valves
Plugged Suction
Eliminate Restriction
Air Leak at Suction
Locate and Repair Leak
Suction Lift too high
Do not exceed vapor pressure of liquid
Motor wired incorrectly
Check wiring diagram
Wrong rotation
Correct rotation
Vapor Lock
Purge trapped air
Pump Shaft speed incorrect
Check Driver speed, motor wiring, pulley tension
Discharge Pressure too high
Reduce downstream pressure
Air Leak at Suction
Locate and Repair Leak
Worn or damaged pump
Inspect and repair as required
Low viscosity
Verify original application conditions
Suction Lift too high
Reduce suction lift
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Foot valve too small
Increase size
Wrong direction of rotation
Inspect for damage, correct rotation
Suction Lift too high
Improve suction pressure
Air or gas in fluid
Eliminate air or gas from fluid
Air Leak at Suction
Locate and Repair Leak
Worn or damaged pump
Inspect and repair as required
Cavitating
Improve system suction pressure, provide adeqaute NPSH
Solid particles in fluid
Install suction strainer. Clean suction strainer
Air or gas in fluid
Eliminate air or gas from fluid
Worn or damaged pump
Inspect and repair as required
Site Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Wiring and Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Flow Direction and Shaft Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Pump Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Suction Plumbing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Discharge Plumbing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
General Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Belt Driven Pedestal Pumps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Fasteners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Pump Driver Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Pump, motor or piping loose
Tighten with care for alignment and piping stress
CLOSE COUPLED/PEDESTAL MOUNT/STANDARD CENTRIFUGAL
SELF PRIMING CENTRIFUGAL
Installation,
Operation, and
Maintenance
Instructions
Gradually Loses Prime
Noisy
Incorrectly sized motor
Shaft speed too fast
Motor Runs Hot or Overloads
Seal Leaks
Fluid viscosity higher than expected
Check wiring diagram
Binding internal pump parts
Inspect and correct condition
Motors normally feel hot
Verify actual motor amperage draw is within rating
Dry running
Open Valves
Abrasive solids in fluid
Add suction strainer
Damaged during field replacement
Inspect and replace damaged components
Seal material incompatible with fluid
Verify original application conditions. Consult factory
www.oberdorfer-pumps.com
ph: 1-800-448-1668
fax: 315-463-9561
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Design . . . . . . . . . . . . . . . . .
Construction . . . . . . . . . . . . .
Application Range . . . . . . . .
Field Inspection . . . . . . . . . .
New Pump Receipt Inspection
Storage . . . . . . . . . . . . . . . .
Records . . . . . . . . . . . . . . . .
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OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Pre-Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Check performance curve and published power requirements
against actual system conditions.
Reduce speed
Change to larger horsepower or higher service factor motor.
Thin fluid.
Incorrectly wired motor
TABLE OF CONTENTS
MAINTENANCE . .
Frequency . . . . . . . . .
Changing Applications
Inspect for Wear . . . . .
Bearings . . . . . . . . . .
Mechanical Seals . . . .
Lip Seals . . . . . . . . . .
Seasonal Service . . . .
Recommended Spares
Trouble Shooting . . . . .
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fax: 315-463-9561
pg.2
pg.7
INTRODUCTION
SAFETY INSTRUCTIONS
Congratulations for choosing an Oberdorfer Centrifugal
pump, the Industry Standard for quality since 1890.
TO AVOID SERIOUS OR FATAL PERSONAL INJURY
OR MAJOR PROPERTY DAMAGE, READ AND FOLLOW ALL THE SAFETY INSTRUCTIONS IN THIS
MANUAL AND ON THE PUMP.
This is a SAFETY ALERT SYMBOL.
When you see this symbol on the
pump or in the manual, look
UNIT NOT DESIGNED FOR USE
WITH HAZARDOUS LIQUIDS OR
FLAMMABLE GASES.
Design
Oberdorfer Centrifugal pumps are of the single stage,
end suction, overhung type. Models use open vane style
and enclosed style impellers. Centrifugals convert driver
energy to kinetic energy in a liquid by accelerating it to
the outer rim of a revolving impeller. Since the amount of
energy given to the liquid corresponds to the velocity at
the impeller's vane tip, the faster the impeller revolves (or
the bigger the impeller is), the higher the velocity of the
liquid at the vane tip and the greater the energy imparted to the liquid. In comparison to positive displacement
devices, centrifugals are quieter and require no relief
valve to protect the pumps from pressure build-up.
Construction
Housings: Oberdorfer Pumps metal pump housings are
made of top quality rugged cast bronze or light weight
corrosion resistant cast aluminum. Shafts are corrosion
resistant stainless steel or monel.
OPERATION AT OR NEAR ZERO
FLOW CAN CAUSE EXTREME
HEAT, PERSONAL INJURY OR
PROPERTY.
FAILURE TO RELIEVE SYSTEM
PRESSURE AND DRAIN SYSTEM
BEFORE ATTEMPTING ANY MAINTENANCE CAN CAUSE PROPERTY
DAMAGE, PERSONAL INJURY OR
DEATH.
FAILURE TO DISCONNECT AND
LOCKOUT ELECTRICAL POWER
BEFORE ATTEMPTING ANY MAINTENANCE CAN CAUSE SHOCK,
BURNS OR DEATH.
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Bearings: Pedestal Pumps use heavy duty "lubricated
for life" ball bearings suitable for pulley loads. Most of the
Close Coupled pumps are designed to fit jet pump Cfaced motors; relying on the motor bearings to support
pump loads.
Lip Seals
Model 170M pumps, equipped with lip seals are of the
metal cased, spring energized, single lip style. These are
intended to provide minimum friction drag with positive
sealing and again should be maintenance free provided
the same conditions for mechanical seals are met as well
as:
6) Avoid scouring of the shaft in the lip seal area due to
contaminated abrasives
These are readily replaceable by pressing out the old
seals and pressing in new replacement seals.
Seasonal Service
To REMOVE pump from service, remove all drain plugs
and drain all piping.
To RETURN pump to service, replace all drain plugs
using an appropriate thread sealant. Reconnect suction
line if removed, examine union and repair if necessary.
Reprime and operate pump following all instructions and
warnings in the "OPERATION" section of manual.
Recommended Spares
Repair kits are available for all Oberdorfer Centrifugal
Pumps. For the proper kit, refer to the cut sheet literature
for your specific product. For further support, contact
your Oberdorfer Distributor or the factory. Kits are supplied with a full set of internal components including
impellers, seals, gaskets, shafts and bearings.
Seals: Conventional mechanical shaft seals with carbon
and ceramic faces are used. A variety of elastomers and
seal styles are available. Model 170M uses a lip seal
instead. Static housing sealing is accomplished with
elastomeric o-ring seals or cellulose gaskets.
Application Range
Centrifugals are well suited for thin fluids and normally
run at 3450 RPM speed. Because these units have large
internal clearances, they can handle small impurities in
the fluid. Bronze centrifugals can pump a variety of common fluids in the PH range from 4-11 and are particularly well suited for non-potable water or sea water service.
The temperature limit for units equipped with buna seals
is 212oF. Solvent handling and higher temperatures are
possible with viton or teflon seals.
Centrifugals are not well suited for viscous fluids; becoming less efficient with increased viscosities.
ph: 1-800-448-1668
fax: 315-463-9561
www.oberdorfer-pumps.com
ph: 1-800-448-1668
fax: 315-463-9561
pg.5
pg.4
WARNING: Failure to permanently ground
the pump, motor and controls before connecting to electrical power can cause shock,
burns or death.
Flow Direction and Shaft Rotation
Oberdorfer Centrifugal pumps are unidirectional; fluid
moves from the end suction inlet port to the tangential
discharge outlet port. Impellers are intended to spin in
only one rotation direction as indicated by the rotation
arrow located on the pump body.
WARNING: Incorrect rotation can cause pump
damage.
Prior to supplying liquids to the pump, check shaft rotation by momentarily energizing or bumping the motor (for
no more than a few seconds). Some motors have a
removable end cap or plug.
To reverse three-phase motor rotation, interchange any
two power supply leads.
Pump Orientation
Standard Centrifugal- Pumps can function horizontally,
vertically, or inclined provided there is adequate fluid
supplied to the pump inlet and ultimately, the eye of the
impeller. For vertical mounting, do not install with pump
above motor.
Relative to the motor base, the
casing/body discharge can be oriented to any of the multiple positions possible given the symmetry of the bolting
pattern.
Self-Primers - Pumps must be operated with shaft in the
horizontal position and the discharge facing upwards. A
slight incline of no more that 15% can be tolerated.
Suction Plumbing
Suction side plumbing considerations are key to desirable pump performance, providing protection against
cavitation and other problems. Minimize head loss by
assuring sufficient pipe size. Generally the same size
pipe as the pump ports is adequate. For long runs
(beyond 3 feet) use one or two pipe sizes larger. Strive
to keep the lines as short and straight as possible. If flexible lines are used, they should be selected to prevent
wall collapse. To keep the pump from being starved or
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running dry, be sure there is sufficient fluid supply. For
Standard Centrifugals, a flooded suction is generally preferred. When taking suction from a tank or vessel, it is
usually recommended to position the inlet above the
maximum expected level of solids. Use full-bore ball
valves or gate valves to minimize restriction. Suction
strainers should be properly sized to minimize pressure
drop and positioned for easy cleaning access. If start-up
screens are used, be sure they are removed prior to
placing the system into regular operation. Orient lines so
as to prevent formation of air pockets (key to avoiding
vapor locking the pump). Be sure all joints are tight
(allowing air to enter can lead to a loss of prime). Flush
out all suction lines prior to installing the pump.
SELF PRIMERS
Standard Centrifugals (If flooded suction cannot be
attained)
Use a foot valve only if necessary for priming or to hold
prime during intermittent duty. To avoid air pockets, no
part of the piping should be above the pump suction connection. Slope the piping upward from liquid source.
Suction strainers must be at least three times the suction
pipe diameter area.
Discharge Plumbing
To control and throttle pump discharge, it is advisable to
install an adjustable valve in the discharge line close to
the pump. To monitor the head that the pump is working
against, install a pressure gage also. The gage should
be located between the pump and the adjustable valve.
Installing a check valve in the discharge line may be
desirable to prevent backflow during maintenance or
pump idle time. To further reduce the head that the
pump is working against, and to increase flow rate
…design the downstream system piping to minimize friction losses and unnecessary rises in elevation.
General Piping
Hard piping must not be connected to the pump until the
pump unit hold down bolts have been tightened.
For further ease of maintenance, use union fittings to
connect the pump to the system. If the pump is installed
below the liquid source, install a gate valve in the suction
for pump inspection and maintenance.
NOTICE: Do not use a suction side gate valve to throttle
pump. This may cause loss of prime, excessive temperatures and damage to pump.
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fax: 315-463-9561
For models where a priming port is not already provided,
install a priming tee for convenience. Do not spring the
piping to connect the pump. Use piping supports or
hangers as required. When necessary, provide for thermal expansion and contraction to avoid placing strain on
the pump.
NOTICE: Do not force piping into place at pump suction
and discharge connections.
Be sure that connecting pipe male tapered threads are
not undersize. Properly sized pipe threads will tighten
adequately and (with proper thread sealant) will seal
properly without risk of contacting the impeller and interfering with pump performance.
Alignment
Proper alignment between pump shaft and motor shaft is
key to the performance of shaft seals and bearings.
Improper alignment can lead to premature pump failure.
Pedestal style - inline shaft to shaft spacing is dependent upon the coupling being used. Check the alignment
carefully between the pump and the drive . A number of
techniques are acceptable provided: parallel alignment is
achieved at 0.005" TIR or less and angular alignment is
achieved at 0.005" TIR or less. If realignment is necessary, always move the motor. Shim as required.
NOTICE: Always recheck both alignments after making
any mechanical adjustments.
Fasteners
Unless the pump has been shipped directly from the factory, it is recommended to check all bolts and nuts for
tightness to eliminate possible leakage problems or
destructive vibration.
Pump Driver Mounting
Close Coupled Pump Heads - (purchased without factory installed motors). Follow the disassembly / reassembly instructions specific to the pump model.
Pedestal Pumps - Some base mount kits designed for
use with Oberdorfer Bronze Gear Pumps, may also be
adaptable for use with Oberdorfer Pedestal Centrifugal
pumps. These kits include baseplate, coupling components, coupling guard, and hardware. Contact your
Oberdorfer representative for additional information. See
"Alignment" above for more information.
Seals
Lip: Model 170M Pumps is supplied with a spring energized buna lip seal. It requires cooling and lubrication to
perform properly. Do not run pump dry. Ensure that the
lip/shaft surface is wet prior to start-up and operation.
Keep abrasives out of the seal area.
Mechanical Seals: Models other than 170M use standard single internal bellows or wedge type seals. These
require cooling and lubrication to perform properly. Do
not run pump dry. Ensure that the seal surfaces are wet
prior to start-up and operation. Keep abrasives out of the
seal area.
Close coupled style- pump adapters provide the required
alignment to C-faced motors.
OPERATION
Belt Driven Pedestal Pumps
Ensure that the pump and motor shafts are parallel and
in line within 1/8". Be sure that the belt tension is adequate (per the belt manufacturer's recommendation) but
do not overtighten. Use belt tension gage if necessary.
Strive to achieve 50% belt wrap on pulley (20 to 30 % is
inadequate). A single ½" (A or 4L section) V-belt is satisfactory for drive speeds up to 1 HP 3450 RPM. For larger drive sizes, double-V belts are recommended.
Pre-Startup
Prior to start-up, recheck installation as described above.
If not already performed previously, verify desired rotation by jogging the motor and make corrections if necessary.
Priming: Completely fill the suction lines and pump body
with liquid. (Some models such as self-primers are conveniently equipped with an FNPT priming port). Close the
discharge valve.
WARNING: Do not operate pedestal pumps
without safety guards in place or severe
personal injury may result. Install guards
around all moving parts in accordance with
OSHA to prevent personal injury.
Startup
Start pump and begin opening the discharge valve as the
motor ramps up to its full speed. If the pump does not
build up pressure and generate flow, or if the system
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ph: 1-800-448-1668
fax: 315-463-9561
pg.6
pg.3
pressure is surging, or prolonged pressure drop is experienced, the system may not be completely primed. Shut
down and reprime pump.
NOTICE: If pump is drained or shut off during priming
period, ensure casing is refilled before restarting pump.
Lip Styles: No adjustment is necessary during operation.
Single Mechanical Seals: No seal adjustment is necessary.
Warning: Continued operation at or near
zero flow due to loss of prime or closed discharge, can cause extreme heat, personal
injury or property damage.
Warning: Do not run pump dry or seal damage
will result.
Warning: Abrasives will accelerate pump wear. It
is advisable to flush the pump after each usage
when pumping fluids containing known particles
or when pumping fluids that can precipitate particles.
WARNING: Allowing liquid to freeze in the pump
can cause damage.
Changing Applications
Verify that all wetted parts of the pump are compatible
with the new fluid to be handled and that the motor is
adequately sized. Check with your Oberdorfer distributor
if in doubt.
Inspect for Wear
If your Oberdorfer Centrifugal Pump exhibits reduced
flow, an inability to maintain pressure, is noisy or performs otherwise abnormally, first refer to the
Troubleshooting Matrix below. If the problem persists,
the pump should be inspected for wear or damage.
Oberdorfer Centifugal pumps may be readily inspected in
the field. In many cases, this can be accomplished without removal from the system plumbing by way of a back
pull-out design. Simply remove the body screws, leaving
the body with the system piping. Before attempting an
inspection, follow safety precautions. Full pump removal
and complete disassembly may be needed for a comprehensive inspection.
Bearings
No lubrication is required on pump. For motor lubrication,
refer to and follow motor manufacturer's instruction.
MAINTENANCE
Frequency
Since each installation differs, the frequency and extent
of pump maintenance is best established based upon
past performance. Keeping detailed maintenance
records of past performance aids in determining future
preventative maintenance intervals. During routine operating inspections, pay particular attention to seal and
bearing areas of the pump. Consult the motor manufacturer for motor maintenance instructions.
Warning: Before attempting to service the
pump: Disconnect motor power and release all
pressure within the system. Failure to disconnect and lockout electrical power before
attempting any maintenance can cause severe
personal injury.
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Warning: Failure to relieve system pressure
and drain system before attempting any maintenance can cause property damage, personal
injury or death. Flush the pump thoroughly with
a neutralizing fluid before attempting to disassemble. Wear appropriate personal protection equipment and handle the equipment with care.
Mechanical Seals
Pumps equipped with mechanical seals are of the standard pusher bellows type or wedge style. They can be
expected to provide long and troublefree service provided:
1) Seal materials are compatible with pumped fluid and
properly applied to the service.
2) Adequate cooling and lubrication is provided
3) Dry running is avoided
4) Abrasives are kept away from the seal area
5) Pump and driver are properly aligned
Detailed instructions are included in the "Centrifugal
Pumps: Seal Replacement Instructions" document.
ph: 1-800-448-1668
fax: 315-463-9561
The product portfolio of over 28 models spans a
hydraulic coverage range from 2.2 GPM to 100 GPM
with pressures to 58 psi (135 feet).
WARNING: These units are not designed for
use with hazardous liquids or flammable
gases.
Standard centrifugals are not self-priming. They should
be installed below the liquid level to allow fluid to flow to
the inlet by gravity (flooded suction).
Self-Priming centrifugals must be manually primed once
at initial start-up. On subsequent starts, the pump will
automatically prime itself and develop lifting capability.
See model specific product literature for information
regarding suction lifts.
Field Inspection
Oberdorfer Centifugal pumps may be readily inspected in
the field. In many cases, this can be accomplished without removal from the system plumbing by way of a back
pull-out design. Simply remove the body screws, leaving
the body with the system piping. Before attempting an
inspection, follow safety precautions and be sure to read
and understand this manual.
New Pump Receipt Inspection
Upon receipt, check for obvious shipping damage and
completeness to purchase order requirements.
Shortages or damage should be reported immediately to
the carrier and to your Oberdorfer distributor.
Occasionally during shipment, damage including
cracked mechanical seal faces can occur. As such, customers are advised to test the pump with water in a convenient location prior to installing into the intended system.
Storage
If the pump is to be stored prior to installation, it is recommended that it be left in the original shipping carton
with all shipping plugs in place and stored in a dry environment avoiding temperature variations. Contact the
motor manufacturer for specific motor storage information.
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Records
These instructions should be kept in a convenient location for ready reference. The manual should be read
carefully by persons responsible for installation, operation, and maintenance of the equipment. For ease of reference, a copy of the order should be kept with the manual. Write down the pump model number as shown on
the pump nametag, and the date the unit was placed into
service.
INSTALLATION
Site Preparation
Choose a site that allows easy access to the pump for
maintenance. Consider protection from the elements.
Guard against drips and spray from nearby equipment.
Choose a solid foundation for mounting. If noise is a concern, consider a rubber pad under the pump base to
dampen.
WARNING: Splashing or immersing open
drip proof motors in fluid can cause fire,
shock, burns or death.
Wiring and Grounding
SAFETY ALERT: Install, ground and wire
according to local and National Electrical Code
Requirements.
• Install an all leg disconnect switch near the pump.
• Disconnect and lockout electrical power before
installing or servicing the pump.
• Electrical supply MUST match nameplate specifica
tions. Incorrect voltage can cause fire, damage to the
motor.
• Motors not protected MUST be provided with contac
tors and thermal overloads for single phase motors,
or starters with heaters for three phase motors. See
motor nameplate.
• Use only copper wire to motor and ground. The
ground wire MUST be at least as large as the wire to
the motor. Wires should be color coded for ease of
maintenance.
• Carefully follow motor manufacturer's wiring diagram
(usually located on the motor nameplate or terminal
cover).
ph: 1-800-448-1668
fax: 315-463-9561
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