TM 10-4610-241-10
TO 40W4-13-41
Table 3-2. Operator Troubleshooting (ROWPU) - cont.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
16.
PRODUCT WATER TOTAL DISSOLVED SOLIDS (TDS) LEVEL IS ABOVE 1000 PPM cont.
c. Using vent/sample valves (figure 2-47), collect sample product water from each R. O. pressure tube.
d.
Using clean container, collect a sample of product water from front and rear vent/sample valves of
R.O. Vessel 1. Be sure to rinse container three times with sample water before collecting sample.
Record reading as front and rear sample.
e.
Measure TDS of each product water sample using the TDS meter (para. 2-15).
f.
Based on the TDS measurements of the collected samples, one of the following four conditions can
exist:
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.
Condition 1:
Repeat steps c through f for all remaining vessels to determine the correct source(s) of high TDS.
Condition 2:
Remove front end cap and end connector and check condition, lubrication, and size of preformed
packings. Replace damaged or wrong-size preformed packing(s) lubricating with lubricant found in
Storage chest before installation. Carefully reinstall end connector and end cap (para. 3-4).
Condition 3:
Remove rear end cap and end connector and check condition, lubrication, and size of preformed packings.
Replace damaged or wrong-size preformed packing(s), lubricating Preformed packing with lubricant found
in storage chest before installation. Carefully reinstall end connector and end cap (para. 3-4).
MEASURED TDS
3-15
