Pressure Exchanger Of Bmsx - Grundfos BMS Series Installation And Operating Instructions Manual

12.3 Pressure exchanger of BMSX

DANGER
Electric shock
Death or serious personal injury
‐
Before starting any work on the product, make sure that the power supply has been switched off and that it cannot be
accidentally switched on.
Related information
10.3 BMSX system
12.3.1 Excessive sound pressure level
Cause
The pressure exchanger is operating above the rated flow rates on
the low-pressure side, high-pressure side or both.
The pressure exchanger pump is operating with little or no back
pressure.
Air in the system.
Related information
7.4.1 Flow control and balancing
12.3.2 Excessively high recovery in the SWRO system
Cause
The BMS hs or BMS xl pump is operating at a flow rate that is too
high.
Increased salinity or raw-water temperature.
Related information
10.3 BMSX system
12.3.3 High salinity in the high-pressure seawater feed stream
Cause
Unbalanced system.
A jammed or stalled rotor short-circuits the high-pressure
concentrate with the high-pressure feed water. No exchange occurs;
no audible rotation.
Related information
7.4.1 Flow control and balancing
12.3.4 The low-pressure flow is lower than the high-pressure flow which entails mixing and high feed-water salinity
Cause
Operating pressure exchanger pumps below the rated flow rate
results in low rotor rotation and increased mixing.
Malfunctioning or stalled BMS hp pump.
12.3.5 Stalled rotor (no audible rotation)
Cause
The system is operating above the rated pressure or below the rated
flow capacity.
Debris or foreign particles in the device.
The system is not properly flow-balanced.
Related information
7.4.1 Flow control and balancing
12.3.6 Low concentrate flow
Cause
Excessive pressure losses through the SWRO system.
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Remedy
Immediately reduce the flow rate by adjusting the BMS hp pump and
the control valve (13). Balance the system as described in the section
on BMSX system.
To increase the system capacity, add one or more pressure exchanger
pumps in parallel to the existing pumps.
Increase the back pressure by adjusting the concentrate valve.
Balance the system as described in the section on BMSX system.
Vent the system.
Remedy
Check that the main BMS hs or BMS xl flow rate does not exceed the
membrane array production capacity for a given temperature, salinity
and fouling factor.
Adjust flow rates in the system.
Remedy
See the section on the BMSX system.
See the fault about a stalled rotor (no audible rotation).
Remedy
Increase and balance the flows through the pressure exchanger pump.
Do not exceed the recommended maximum flow rates. To increase the
system capacity, add one or more pressure exchanger pumps in
parallel to the existing pumps. See the section on the BMSX system.
Check the rotation, operation, flow rates and pressures of the BMS hp
pump.
Remedy
See the section on the BMSX system.
Contact Grundfos.
See the section on the BMSX system.
Remedy
Contact Grundfos.