X-Changer - Grundfos BMEX Series Montage- Und Betriebsanleitung

22.3 X-Changer

Warning
Before starting work on the X-Changer modules,
make sure that the power supply has been switched
off and that it cannot be accidentally switched on.
Fault Possible cause
1. Excessive sound a) The X-Changer module operates above
pressure levels.
b) The X-Changer module operates with little
c) Air in system.
2. Excessively high a) The BME hp feed pump is operating at too
recovery in the SWRO
system.
b) Excessively high recovery in the SWRO
c) Low-pressure flow is less than high-pressure
3. High salinity in high- a) Unbalanced system.
pressure sea-water
b) A jammed or stalled rotor short circuits high-
feed stream.
4. Low-pressure flow is a) Operating X-Changer module below rated
less than high-pressure
flow resulting in mixing
and high SWRO feed
water salinity.
b) Malfunctioning and/or stalled BM hp
5. Stalled rotor (no a) Operating system above rated pressure or
audible rotation).
b) Foreign debris or particles lodged in device. Contact Grundfos Service.
c) System is not properly flow-balanced.
6. Low reject flow. a) Excessive pressure losses through the
b) Malfunctioning and/or stalled BM hp
rated flow rates on low-pressure side, high-
pressure side or both.
or no back-pressure.
high a flow rate.
system.
flow resulting in mixing and high feed water
salinity.
pressure reject water with high-pressure
feed water. No exchange occurs; no audible
rotation.
flow rate results in low rotor rotation and
increased mixing.
circulation pump.
below rated flow capacity.
SWRO system.
circulation pump.
Remedy
Immediately reduce flow rate by adjustment of the BM
hp circulation pump and control valve (V2). Balance the
system as described in section
Changer module.
To increase system capacity, add X-Changer module(s)
in parallel to existing units.
Increase the back-pressure by adjusting the low-
pressure reject-water valve (V3).
Re-balance the system as described in section
9.6 Balancing the X-Changer module.
Vent the system.
Verify that main BME hp feed pump flow rate does not
exceed the membrane array production capacity for a
given temperature, salinity and fouling factor.
Increase and balance flows through the X-Changer
module. Do not exceed recommended maximum flow
rates. To increase capacity, add X-Changer module(s) in
parallel to existing modules.
See section 9.6 Balancing the X-Changer
See section 9.6 Balancing the X-Changer
See fault number 5.
Increase and balance flows through the X-Changer
module. Do not exceed recommended maximum flow
rates. To increase capacity, add X-Changer module(s) in
parallel to existing units. See section
X-Changer module.
Check BM hp circulation pump rotation, operation, flow
rates and pressures.
See section 9.6 Balancing the X-Changer
See section 9.6 Balancing the X-Changer
Contact Grundfos.
Check operation, flow rates and pressures of the BM hp
circulation pump.
9.6 Balancing the X-
module.
module.
9.6 Balancing the
module.
module.
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