Refer to
6.6.2 Radial clearances on page 67
•
Remove any deposit or scaling.
•
Clean out the stuffing box piping.
•
Measure the total dynamic suction and discharge head in order to test pump performance and pipe
condition. Record the figures and compare them with the figures of the last test. This is especially
important where the pumped liquid tends to form a deposit on internal surfaces.
•
Inspect foot valves and check valves. A faulty foot or check valve will cause poor performance. The
check valve safeguards against water hammer when the pump stops.
6.2 Flood-damaged pumps
If the pump is properly sealed at all joints and connected to both suction and discharge, then it will ex-
clude outside liquid. Therefore, it is only necessary to service the bearings, stuffing box, and coupling
after flood damage.
Perform the following service on a centrifugal pump after a flooded condition:
•
Dismantle the frame, and then inspect the bearings for any rusted or badly worn surfaces. Clean as
necessary. If the bearings are free from rust and wear, then reassemble and re-lubricate them with
one of the recommended lubricants. Depending on the length of time the pump has remained in the
flooded area, it is unlikely that bearing replacement is necessary. Only replace the bearings if rust
or worn surfaces appear.
•
Inspect the stuffing box and clean out any foreign matter that will clog the box. Replace packing
that appears to be worn or no longer regulates leakage properly. Clean and thoroughly flush me-
chanical seals.
•
Dismantle and thoroughly clean the couplings. Lubricate the couplings where required with one of
the lubricants recommended by the coupling manufacturer.
6.3 Bearing maintenance
These bearing lubrication sections list different temperatures of the pumped fluid. If the pump
is ATEX-certified and the temperature of the pumped fluid exceeds the permitted temperature values,
then consult your ITT representative.
For ATEX applications bearing replacement (all) is recommended after 50K hours of opera-
tion.
6.3.1 Regrease the grease-lubricated bearings
CAUTION:
Grease-lubricated bearings are lubricated at the factory. Do not grease too frequently.
6.2 Flood-damaged pumps
Model 3410 Installation, Operation, and Maintenance Manual
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