Trouble Shooting Mechanical & Electric RO Fresh Water System

Trouble Shooting RO Fresh Water System HSRO-25E 

RO Fresh Water System HSRO-25E

Mechanical Trouble Shooting

Fault description:
1. Outlet pressure of booster pump lower than normal
Analysis of causes= 

• The water inlet valve of the equipment is blocked or not fully opened
• Equipment water inlet filter blocked
• Not discharge air from the pump 
• Impeller of booster pump is worn or severely corroded 

Solutions=

• Check the equipment inlet valve and handle it
• Cleaning filter 
• Loosen the discharge cock of booster pump to discharge air
• Replace Impeller 

2. When the booster pump is running, there is no water flow,
and there is no pressure at the pump outlet
Analysis of causes= 

• The pump is not filled with water
• The booster pump is not tuming correctly

Solutions=

• The booster pump shall be stopped immediately, and the water supply pressure of the equipment shall be checked. The water supply pressure of the equipment shall be positive.
• Replace the two pole power supply on the starter 

3. Water leakage from booster pump
Analysis of causes=

• Shaft seal leakage
• Pressure cylinder severely corroded 

Solutions=

• Replace shaft seal 
• Replace pressure cylinder 

4. Vibration and abnormal noise of booster pump
Analysis of causes=

• Cavitation of booster pump while running 
• Motor bearing damaged 
• Foreign matter between moving parts 

Solutions=

• Check whether the inlet of booster pump is blocked 
• Replace the bearing
• Open pump casing and clean 

5. Sand filter is blocked quickly
Analysis of causes= 

• The interval of automatic backwashing is too long

Solutions =

• Reduce automatic backwashing interval 

6. Large pressure difference of fine filter 
Analysis of causes=

• Filter clogging 

Solutions=

• Replace filter element 

7. Fast clogging of fine filter 
Analysis of causes=

• Poor sea water quality and heavy sediment 

Solutions=

• It has not met the use conditions of the device. It is recommended to stand by

8. The sea water flow is lower than the design value, and the outlet pressure of high pressure pump cannot be adjusted to the design pressure 

Analysis of causes-

• Abnormal wear of high pressure pump 

Solutions=

• Disassemble the high pressure pump and check the wear of each component

9. High pressure pump inlet low pressure alarm

Analysis of causes=

• Pressure drop of filter system is too large
• High pressure pump inlet pipe leaking 
• Multi-way valve damaged, seawater flowing into backwash pipeline
• Low pressure switch setting value higher than normal

Solutions=

• Incerease backwash frequency of sand filter or replace filter element
• Repair leaks
• Replace multi-way valve
• Adjust the setting value of low pressure switch to 0.05MPa 

10. The seawater flow is normal, and the outlet pressure of high-pressure pump cannot be adjusted to the design pressure. 

Analysis of causes=

• Pressure regulating valve failure

Solutions=

• Replace pressure regulating valve

11. The water production flow is obviously higher than the design value and the salinity is obviously higher than the set value. 

Analysis of cause=

• The sealing ring between reverse Osmosis membranes is not installed in  place or damaged
• Reverse Osmosis membrane damaged

Solutions=

• Check sealing ring and refit 
• Replace membrane 

12. High pressure pump inlet and outlet pressure gauges have high vibration frequency and large amplitude. 

Analysis of causes 

• There is air in the high pressure pump

Solutions=

• Open the exhaust valve of the high-pressure pump to discharge the air

13. The water yield flow is lower than the design value

Analysis of causes=

• Ro pressure below demand
• RO membrane element is fouled
• Sea water temperature reduction

Solutions=

• Slowly rotate the pressure regulating valve clockwise to increase the reverse osmosis pressure
• Chemical cleaning or replacement reverse osmosis membrane 
• Slowly rotate the presure regulating valve clockwise to increase the reverse osmosis pressure.

14. When the reverse osmosis pressure is lower than 6MPa. the system will give high pressure alam and shut down

Analysis of causes=

• The setting value of high pressure switch is too low or damaged

Solutions=

• Readjust or replace the high pressure switch

15. The pointer of pressure gauge does not return to zero or the display pressure is abnormal

Analysis of causes=

• Pressure gauge damaged

Solutions=

• Replace the pressure gauge

16. When the equipment produces water, the safety valve of the water production pipeline open

Analysis of causes= 

• The valve of fresh water pipeline outside the equipment is not opened

Solutions=

• Open the valve

Electric Trouble Shooting

Fault description:

17. The conductivity value of produced water deviates from the factory setting value

Analysis of causes=

• Salinity meter probe corrosion
• Salinity probe calibration offset

Solutions =

• Replace salinity meter probe

18. Controller fuse is blown at system start

Analysis of causes=

• Transformer fault
• line short circuit

Solutions =

• Replace the transformer
• Recheck the wiring and correct the wiring

19. System will not stop when STOP button is depressed High pressure pump does not delay standby after pressing "stop"

Analysis of causes=

• Control panel defective

Solutions =

• Replace control panel

20. Solenoid valves don't change from overboard mode to water production mode

Analysis of causes=

• Loose connecting post or wiring error
• Solenoid coil damaged

Solutions =

• Check wiring and correct
• Replace solenoid coil

21. Booster pump does not start

Analysis of causes=

• Motor fault
• Overload protection previously cut in
• Control panel defective

Solutions =

• Repair or replace the motor
• Reset the protection
• Replace control panel

22. The overload protection cuts is-systematically 

Analysis of causes=

• Incorrect setting
• Pump head or flow out of rating

Solutions= 

• Set to rated amperage
• Adjust the valve to reduce the pump outlet pressure or flow

Sumber: Manual Book RO Fresh Water System HSRO-25E