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 TM 55-1905-223-24-18-1
Troubleshooting - CONT
Table 2-2.
Malfunction
Test or Inspection
Corrective Action
SEWAGE AND PLUMBING PIPING SYSTEM
Liquid will not flow through drain.
232.
Check for clogged strainer drain or drain pipe.
STEP 1.
Clean strainer.
Unclog drain by rodding. Remove nearest cleanout to allow mechanical
b.
cleaning of pipeline.
Check for malfunctioning check valve.
c.
Tank cannot be dewatered, eductor suction gauge indicates a vacuum and suction
233.
valve is open.
STEP 1. Check for clogged suction tailpipe.
Clean tailpipe.
STEP 2. Check for clogged suction stop valve.
Open and clean suction stop valve and eductor suction check valve.
FOAM PROPORTIONERS (AFFF) PIPING SYSTEM
AFFF system fails to energize when manual control valve is opened.
234.
STEP 1. Check for inoperative manual control valve.
Replace manual control valve.
STEP 2. Check for plugged manual control valve drain line.
Clean drain line.
Check for bent, crimped, or plugged piping between manual control valve
STEP 3.
and butterfly valve.
Repair or replace faulty piping (para. 2-369).
STEP 4. Check for plugged or damaged 3-way valve plug.
Repair or replace valve (para. 2-369).
STEP 5. Check for closed firemain supply to AFFF gate valve.
Open gate valve.
STEP 6. Check for plugged or damaged firemain.
Flush firemain.
STEP 7. Check for inoperative butterfly valve.
Repair or replace butterfly valve (para. 2-369).
2-174
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