Table 3-2. Troubleshooting (ROWPU) (continued)
TEST OR INSPECTION
CHEMICAL FEED PUMP FAILS TO PRIME.
If pump fails to prime after setting control knob to max 8.5 Check the plastic suction line from the
container to the pump.
a. If water level in suction tube does not reach the pump body or the water is not passing through
the suction or discharge ball valves, disconnect the suction and discharge tubes from the
b. Unscrew tubing nut from pump head Remove four hex-head capscrews from diaphragm body
Inspect for and remove any foreign material between ball and valve seat.
Assemble valve parts and reconnect suction and discharge tubes.
PRODUCT WATER TOTAL DISSOLVED SOLIDS (TDS) LEVEL IS ABOVE 1500 PPM.
Check product water from each pressure vessel as follows:
Start up ROWPU as normal (para.2-25).
Adjust R.O PRESSURE to 960 psig for seawater feed or 500 psig for fresh/brackish water
feed Collect a sample of product water in a clean container and measure TDS with TDS
meter (para.2-32) Record value.
Open REGULATE PRODUCT WATER valve fully Product water flow should decrease to
If sample valves are available, use them to collect sample product water from each
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.
Open REGULATE PRODUCT WATER valve fully Product water flow should decrease to zero
at product water flow meter and Vessel 1 stub tubes.
Measure TDS of each product water sample using the TDS meter (para.2-32).
Based on the TDS measurements of the collected samples, one of the following four
conditions can exist: