RS – Multi-Stage, I-280
Centrifugal Pump 280 – 16.03.EN
24
H. INDEFINITE SHUTDOWN.
CAUTION
When pump is handling hazardous fluid,
extreme care must be taken to ensure safety of
personnel when attempting to drain pump and
piping before disconnecting the pumping unit.
Suitable protection devices should be used
and/or protective clothing should be worn.
For shipment and long term storage purposes
the pump ball bearing shall be fogged once
every 30 days during storage with a rust
retardant compatible with the oil used in the
system to prevent rusting.
Refer to Figures 13, 14, and 15, for the location of parts
identified by item numbers. Drain pump by removing the
following: plugs (424) form the bottom of each interstage
case (111) and suction case (9), and plug (421) from
discharge case (1) depending on design. If necessary,
flush pump to remove corrosive or toxic pumpage.
Collect and dispose of corrosive or toxic material
appropriately. Drain oil from bearing frame by removing
pipe plugs (426) from bearing caps (37). Drain all piping
if there is a possibility of liquid freezing. Provide pump
and driver with a protective cover.
IX. TROUBLESHOOTING OPERATING
PROBLEMS.
If you have followed the installation and starting
procedures outlined in this manual, the pump should
provide reliable service and long life. However, if
operating problems do occur; significant time and
expense can be saved if you refer to Table 11 to
eliminate the most common causes of those problems.
Immediate action to be taken before proceeding with
corrective actions in Table 11 is to stop the pump, refer
to Section VIII, Paragraph G.
Table 11. Pumping Unit Troubleshooting
Failure to deliver
liquid.
1. Discharge head above shutoff.
2. Check valve stuck or improperly installed.
3. Impeller or suction line clogged.
4. Improperly installed impeller.
5. Incomplete priming or venting of pump or
piping.
6. Valves are not fully open.
7. Excessive wear of internal parts.
1. Check pump rating against actual head
condition.
2. Adjust and/or reverse valve.
3. Inspect suction line and impeller. Clean as
necessary.
4. Disassemble pump and correct axial
alignment of impeller.
5. Vent piping again carefully and prime
pump.
6. Open valves and if necessary, lock valves
open to prevent accidental closure.
7. Disassemble pump and replace worn parts.
Excessive
power
consumption.
1. Head lower than rating: trying to pump too
much liquid or operating at end of
performance curve.
2. Specific gravity or viscosity of liquid is too
high.
3. Mechanical defects such as binding rotating
elements.
4. System head lower than design condition.
5. Incorrect impeller diameter.
1. Adjust pressure flow.
2. Check liquid temperature and adjust as
necessary.
3. Check for excessive pipe strain. Check
foundation bolting. Replace defective parts.
4. Adjust system head. Trim impellers to
actual condition.
5. Replace impeller or trim impeller to correct
diameter. Consult with Carver Pump before
trimming impellers.
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