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 TM 55-1905-223-24-18-1
Table 2-2.
Troubleshooting - CONT
Malfunction
Test or Inspection
Corrective Action
SEAWATER COOLING PIPING SYSTEM - CONT
STEP 2. Check for closed suction valve.
Ensure suction valve is fully open.
Check valve installed backwards or jammed.
STEP 3.
Ensure check valve is installed in correct direction with stem in the
a.
u p r i g h t position.
b.
If check valve is jammed:
(1) Remove valve, (para. 2-336).
(2) Inspect and clean as necessary.
(3) Clean or replace strainer basket.
STEP 4.
Check for clogged duplex strainer.
a.
Isolate
strainer.
b.
Clean or replace strainer basket.
STEP 5. Check for pump casing vapor leak (cavitation).
Refer to POTABLE WATER PIPING SYSTEM troubleshooting, Malfunction 2, Step
4.
STEP 6. Check for clogged or damaged pump casing or pump discharge line.
Replace pump, para. 2-99.
STEP 7. Pump speed too low.
Refer to POTABLE WATER PIPING SYSTEM troubleshooting, Malfunction 1, Step
11.
STEP 8. Pump not rotating.
Refer to POTABLE WATER PIPING SYSTEM troubleshooting, Malfunction 2, Step
9.
Excessive pump vibration.
221.
STEP 1. Air in system.
a. Bleed pump and suction line.
b. Prime pump. Refer to POTABLE WATER PIPING SYSTEM troubleshooting
Malfunction 2, Step 4.
STEP 2. Check for loose or broken foundation bolts.
Tighten or replace bolts.
STEP 3. Check for pump/motor misalignment.
a. Inspect pump and motor alignment with suction and discharge piping.
b. Shim unit as necessary.
c. Check all piping supports for security and effective loading.
2-168
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