TM 10-4610-241-10
TO 40W4-13-41
Table 3-2. Operator Troubleshooting (ROWPU) - cont.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5.
PRODUCT WATER FLOW READING RISES ABOVE 16 GPM (FRESH/BRACKISH), 12 (SEAWATER) AND
CANNOT BE LOWERED USING REGULATE PRODUCT FLOW VALVE cont.
CONDITION
FRONT
SAMPLE
REAR
SAMPLE
CAUSE
1
NORMAL
NORMAL
Vessel operation OK
2
HIGH
NORMAL
Leak at front end connector preformed packing*
3
NORMAL
HIGH
Leak at rear end connector Preformed packing*
4
HIGH
HIGH
Leak at front and rear end connector Preformed packing
and/or R.O. element interconnector Preformed packing*
*Condition could also be caused by defective R.O. element.
Step 2. Check product water flow from each R.O. vessel.
a.
Use same method as in Step 1 to collect product water sample, but this time measure the time in
minutes it takes to fill a 3-gallon bucket with product water from each vessel. Divide the number of
minutes by three.
b. Make a chart like the following:
R.O. Vessel
Flow in GPM
1 (-Top)
4
2
3
3
2
4 (Bottom)
1
c. Examine your chart for a similar pattern. Flow rate should get smaller from top to bottom.
(1) If any R.O. vessel does not follow this pattern, disassemble that vessel and replace defective
items (para. 3-4).
MEASURED TDS
3-7
