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 TM 55-1905-223-24-18-1
Troubleshooting - CONT
Table 2-2.
Malfunction
Test or Inspection
Corrective Action
CENTRIFUGAL PUMP UNIT (FRESH WATER)
55. Low discharge pressure.
STEP 1. Check for liquid vortexing (cavitation) in casing.
Release trapped air from pump casing.
STEP 2. Check for air or gas in liquid.
Identify source and correct problem.
STEP 3. Check for low liquid level in fresh water tank.
Shift suction to tank containing water.
STEP 4. Check for partially closed pump suction valve.
Ensure pump suction valve fully open.
STEP 5. Check for partially closed discharge pressure gauge cutoff valve.
Ensure discharge pressure gauge cutoff valve fully open.
Check for partially clogged pressure line or defective discharge
STEP 6.
pressure gauge.
Clean pressure line. Replace pressure gauge.
STEP 7. Check for partially clogged pump casing and discharge piping.
Flush pump casing with clean water. Clean trap/strainer in discharge
piping (TM 55-1905-223-23-1819).
STEP 8. Check for air leak(s) in suction piping.
Tighten loose connection(s) in suction piping.
STEP 9. Check hydropneumatic pressure tank for leak(s).
Tighten loose connection(s). Replace gaskets (TM 55-1905-223-24-1813).
STEP 10. Check pump/motor for wrong direction of rotation.
Wire motor per instructions given on motor nameplate/decal.
STEP 11. Check for defective pump.
Replace pump, para. 2-95.
56. Pump motor not running.
STEP 1. Check for open pump motor circuit breaker.
Reset circuit breaker at Main Switchboard 240 V distribution panel on main
ship's service switchboard (Engine Control Station).
2-123
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