GE OSMONICS E4 Series Installation, Operation And Maintenance Manual page 29

T R O U B L E S H O O T I N G G U I D E
PROBLEM
Low concentrate flow
rate, normal or higher
than normal pressure
High operating pressure
Excessive pressure drop
[over 50 psig (3.0 barg)]
(high primary pressure -
low final pressure)
POSSIBLE CAUSE
Concentrate valve plugged
Concentrate outlet line
restricted
Flow meter inaccurate
Dirty concentrate valve
Recycle or concentrate valve
plugged
Inaccurate pressure gauge
Restricted or reduced
permeate flow rate
Restricted flow after
pump outlet
24
SOLUTION
Remove the concentrate valve step
and/or disassemble the plumbing.
Clean the valve
Examine the concentrate line for
obstructions or kinks, repair or
replace the tubing.
Check the flow rate manually with a
stop watch and calibrated
container.
Disassemble and clean the
plumbing to the valve
Disassemble the plumbing to the
recycle valve and remove foreign
particles. Check the concentrate
valve stem.
Replace or calibrate the gauge as
required.
See possible causes for low
permeate rate.
Check for blockage of the concen-
trate flow at the inlets and outlets of
the membrane element housings.