TM 10-4610-241-10
TO 4OW4-13-41
Table 3-2. Operator Troubleshooting (ROWPU) - cont.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 3.
Check to see if associated pump is operating. For R.O. pump (on Models WPES-10, WPES-20, and
WPES-30) see if sheave is turning; for other pumps, set hand lightly on the motor casing to feel for
motor vibrations.
2.
a.
If pump is not operating, check and reset respective circuit breaker (figure 2-5) in junction box
and then immediately try to restart pump. Do so only one time.
b.
If pump fails to start, notify unit maintenance.
c.
Shut down ROWPU in normal manner (para. 2-14a) except when only one raw water pump fails
or distribution pump fails. In these two cases the ROWPU can still be operated.
RAW WATER FLOW INDICATOR DROPS TO ZERO; BOTH RAW WATER PUMP LAMPS ARE ON.
Step 1.
Check to see that both raw water pumps are operating. Listen to motor and rest hand lightly on motor
casing to feel for vibration.
a.
If pump is not operating, check and reset circuit breaker (figure 2-5) and then immediately attempt
to restart. Do so only one time.
b.
If pump fails to start, notify unit maintenance and remove defective raw water pump from system.
Step 2. Check to see if suction strainer is completely under water.
a.
Lengthen strainer rope.
b.
Move suction strainer to deeper water.
Step 3. Check to see if suction strainer is clogged.
Step 3.1
Step 4.
Step 5.
3-4 Change 2
a.
Clean debris from suction strainer (par-a. 3-6).
b.
Shorten strainer rope so strainer does not rest on bottom of raw water source.
c.
Make sure raw water pump is sufficiently close to raw water source.
If ocean intake structure is being used, check to insure that wellpoints are secure and have not been
dislodged.
Install wellpoints (para. 2-7o.1).
Check and reprime pumps.
Check for loose hose connections or damaged hose sections.
a.
Tighten loose connections.
b.
Replace damaged hose sections.
