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F-801 Internal RO System by GE Osmonics
12552e - 27 Feb 04 5- 9 Troubleshooting
5.9 Membrane Product Pressure Too Low
1. Product flow rate below specifications for temperature and pressure.
a. Clean or replace membrane.
2. Flow demand exceeds flow capacity of membrane.
a. Correct condition demanding excessive flows.
b. Increase temperature of feed water and/or pump pressure (within operating
limits). Continuously monitor temperature.
5.10 Leaks
1. General information: Any leak from any part of the system should be corrected
as soon as possible. Left unattended, leaks can cause secondary damage
necessitating expensive repairs.
2. Refer to the Maintenance Procedures for Leak Repair.
5.11 Low Percent Rejection
The overall membrane performance can be affected by a number of factors. Poor
rejection performance, as well as high TDS, can result from fouled membranes, low
pump pressure, inadequate waste flow, or feed water problems. An apparent
performance problem could be caused by a defective sensor or circuit board, and not be
a membrane issue at all. The recommended first step for any ‘membrane performance’
question is to confirm the rejection percentage and product TDS with a hand-held
RO/TDS meter. If the product water quality is poor, investigate the membrane.
However, if the water quality tests ‘normal’, investigate the monitoring circuits.
1. Disinfectant or cleaner left in RO unit.
a. Check for presence of disinfectant or cleaner, rinse as necessary.
2. Waste flow too low.
a. Pump not operating correctly, see 5.4.
b. Check waste flow control.
c. Check for obstruction or kink in waste line.
3. Pump pressure too low.
a. Adjust pressure regulator.
b. Adjust pump settings.
c. Pump not operating correctly, see 5.4.
4. Product flow too high.
a. See 5.8
5. Membrane scaled or fouled.
a. Verify condition of pretreatment equipment.
b. See membrane cleaning procedure in this manual.