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 TM 55-1905-223-24-12
Table 2-2. Unit Troubleshooting
Malfunction
Test or Inspection
Corrective Action
CENTRIFUGAL PUMP UNIT
1. Liquid not being pumped.
STEP 1. Check for prime.
Fill pump and suction pipe completely with liquid (paragraph 2-6).
STEP 2. Check for loss of prime.
Check for and correct leaks in suction pipe joints and fittings; vent casing to remove accumulated
air (TM 55-1905-24-18).
STEP 3. Check to see if suction lift is too high.
Check for obstructions at sea strainer or inlet. Remove obstruction.
STEP 4. Check to see if discharge head is too high.
Check that valves in discharge piping are wide open (TM 55-1905-223-10).
2. Not enough liquid delivered.
STEP 1. Check for air leaks in suction piping.
Shut off or plug inlet and put line under pressure. A drop in pressure gauge reading indicates a
leak. Locate and correct leak (TM 55-1905-223-24-18).
STEP 2. Check to see if discharge head is too high.
Check that discharge valves are wide open (TM 55-1905-223-10).
STEP 3. Check to see if suction lift is too high.
Check for obstruction at sea strainer or inlet. Remove obstruction.
3. Not enough pressure.
STEP 1. Check for leaks in suction piping.
Shut off or plug inlet and put line under pressure. A drop in pressure gauge reading indicates a
leak. Locate and correct (TM 55-1905-223-24-18).
4. Pump operates for short time, then stops pumping.
STEP 1. Check for incomplete priming.
Free pump, piping, and valves of all air (TM 55-1905-223-24-18).
STEP 2. Check to see if suction lift is too high.
Check for obstruction at sea strainer or inlet. Remove obstruction.
2-6
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