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PUMP MAINTENANCE AND SERVICE
Operation
The following points must be ensured before starting the pump:
1. The current supply agrees with the voltage and frequency on the
motor nameplate.
2. The motor is wired for correct voltage.
3. The thermal overload relays are correct size and set for operation.
4. The pump is fully primed. Flood the casing and seal area with
liquid to release the air out of pump through flush line and air vent
valve near discharge flange. Priming must be continued until air is
completely removed. This is indicated by continuous flow of liquid
through flush line and air vent. Disconnect power to the motor and
lock-out / tag-out the power source prior to rotating the shaft by
hand.
a. Failure to flood the seal area with water may cause seal failure
due to lack of lubrication.
5. Jog the motor to check that the motor rotates clockwise, as
indicated by the arrow on the pump casing.
6. Coupling guard must be in its appropriate position on account of
human safety.
Starting Up
1. Start the pump with the discharge valve slightly open and verify that
the pump is operating smoothly and is not rubbing.
2. Start opening the discharge valve gradually.
Notice: Do not run the pump for extended period with discharge
valve closed, so as to avoid overheating and potential damaging
loads.
3. If the pump is equipped with a circulation relief valve, such valve
prevents overheating when the pump is operating at reduced
capacity.
4. Stop the pump immediately if any of the following situations arise:
a. No/insufficient liquid.
b. Inadequate discharge pressure.
c. Loss of suction pressure.
d. High power consumption.
e. Noisy operation and/or high vibration after discharge valve is in
an open position.
Check the manual for troubleshooting the cause. See Pages 21 -
22.
Shut Down
It is recommended to close the discharge valve before stopping the
pump to avoid any water hammer effect. However, this practice is not
mandatory and pump may be stopped with discharge valve open in case
an emergency.
Preferred shutdown sequence is as follows:
1. Preferably close the discharge valve first.
2. Then turn off the motor.
3. Now, close the suction line valve.
4. Drain the pump liquid completely, if pump to be kept nonoperational
for longer period or if there is danger of freezing.
5. If it is necessary for the pump to maintain its prime while it is
shutdown, it is recommended to install either a foot valve or a check
valve in the suction piping.
16
MAINTENANCE AND SERVICE
Schedule
Preventive maintenance and routine check-ups may prevent the pump
from major failures. An inspection & maintenance log should be kept and
the inspector is to immediately report any problems. Pump should be
checked on regular basis for any unusual noise, vibrations and abnormal
rise of temperature. If equipped with a sight flow indicator, check it from
time to time for fluid flow and if no flow is observed, replace the filter or
check the separator. A suggested guide for preventive maintenance for
normal application is given below in Table 1:
Table 1
Guide for preventive maintenance
ITEMS
ACTION REQUIRED
Check for change in
Vibration
vibration levels
Check for proper bolt
Bolting
torque
Mechanical Seals
Monitor seal leakage
Pump/Motor
Check for change in
Alignment
alignment
Check for coating
Surface
integrity or signs of
Inspection
corrosion
Wear and running
Inspect and measure
clearance
No flow in sight
Replace filter, Inspect
flow indicator
separator
(if installed)
Inspect for damage,
Controls and
proper function and
accessories
condition
Inspect for damage,
General site
proper function and
conditions
condition
FREQUENCY
Refer to ANSI/HI 9.6.5
Condition Monitoring
Annually
Refer to ANSI/HI 9.6.5
Condition Monitoring
Annually
Exterior components:
Quarterly
Interior components:
Annually
Annually or as determined by
service condition when
performance
decreases are noted or as
recommended
Daily
Annually
150 hours of operation
as necessary
FM-03-536 (07/15/21)
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