SPX FLOW APV GPHE - 12.10. Maintenance of In-Line Filter

66 | INSTALLATION, OPERATION and MAINTENANCE MANUAL
 Insufficient clamping force can cause leaking.
 Never tighten below the minimum pitch shown on the customer drawing.
To avoid leakage, never tighten to a more relaxed pitch than the previous
closing.
Check the heat exchanger sealing before pipes on the follower are connected.
After any changes, a hydraulic pressure test should be made prior to operation of the
equipment. A leak test at 1.1 x operating pressure is recommended. Please refer to
document GPHE IOM-FIELD for the detailed field pressure test procedure.
12.10. Maintenance of In-Line Filter
The in-line filter, when supplied, needs to be cleaned at regular intervals (Figure 49).
The frequency depends on the content and size of debris in the fluid being filtered. An
increase in the pressure drop over the APV GPHE indicates the need for cleaning.
Clean the in-line filter in this sequence:
 Stop fluid circulation pump.
 Close valve on the filter side.
 Drain the filter side.
 Remove the full faced gasketed blind flange on the follower.
 Carefully pull out the in-line filter through the follower.
 Clean the filter with water and brush. Soap which is not damaging the filter
material may be used.
 Before reinserting the in-line filter it is recommended that you flush any lose
debris from the port where the filter is installed.
 Carefully re-insert the filter in the fluid inlet port through the follower.
 Check that the gasket is in place on the blind flange.
 Place the blind flange on the follower.
 Open the valve on the filter side and release air.
 You may now start your circulation pump.