TM 10-4610-240-10
TM 08580C-10/1
T.O. 40W4-13-21
Table 3-2. Troubleshooting (ROWPU) (continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
16.
PRODUCT WATER TOTAL DISSOLVED SOLIDS (TDS) LEVEL IS ABOVE 1500 PPM.
Step 1.
Check product water from each pressure vessel as follows:
a. Start up ROWPU as normal
b. Adjust R.O. PRESSURE to 960 psig. for sea water feed or 500 psig for fresh/brackish water
feed. Collect a sample of product water in a clean container and measure TI)S with portable
TDS meter (paragraph 2-15). Record value.
c. Using sample valves, collect sample product water from each vessel.
d. Using clean containers, collect a sample of product water from each end of R.O. Vessel 1. Be
sure to rinse each container twice with sample water before collecting sample. Mark container
appropriately as front or rear.
e. Measure TDS of each product water sample using the TDS meter (paragraph 2-15).
f.
Based on the TDS measurements of the collected samples, one of the following four conditions
can exist:
MEASURED TDS
FRONT
REAR
CONDITION
SAMPLE
SAMPLE
CAUSE
1
NORMAL
NORMAL
Vessel operation OK
2
HIGH
NORMAL
Leak at front end-connector O-rings*
3
NORMAL
HIGH
Leak at rear end-connector O-rings*
4
HIGH
HIGH
Leak at front and rear end-connector O-rings and/or
R.O. element interconnector O-rings*
*Condition could also be caused by defective R.O. element.
Condition 1: Repeat steps c through h for all remaining vessels to determine the correct source(s) of high TDS.
3-14
