20
IOM-022
MODEL: GSS-4PM
REV: F
13839 West Bellfort Street, Sugar Land, TX 77498
welker.com
Service Department 281.491.2331
3.2 Maintenance
If maintenance on the valves or probe is required, the GSS-4PM must be isolated from pipeline pressure and removed from the
pipeline before maintenance can be safely performed.
Prior to performing maintenance, the GSS-4PM must be isolated from pipeline pressure. However, the GSS-4PM does NOT need
to be removed from the pipeline to perform
standard
maintenance.
1.
Isolate the GSS-4PM from pipeline pressure.
If the GSS-4PM is equipped with a standard probe, close sample pump isolation valve D (
Figure 2
).
If the GSS-4PM is equipped with the optional LE-2SSKO, close inlet (P₁) valve A and return (P₂) valve B (
Figure 3
).
2.
Turn OFF electrical power to the system and carefully remove all electrical connections.
3.
As necessary, disconnect the tubing between the solenoid exhaust and flare.
4.
As necessary, disconnect the auxiliary instrument air supply.
5.
As necessary, relieve pressure from the tubing connecting the GSS-4PM to the sample cylinder.
6.
Remove the GSS-4PM body from the standard probe or from the optional LE-2SSKO.
7.
As necessary, maintain the optional LE-2SSKO. Refer to the
Installation, Operation, and Maintenance
(IOM)
Manual
for
the LE-2SSKO for maintenance instructions.
8.
Unscrew the diaphragm housing from the body, taking care not to misplace the stainless steel Vacuum Breaker™ disc or
clear spider seal, which separate from the body with the removal of the diaphragm housing (
Figure 8
or
Figure 11
). The
collection head assembly should now be exposed.
Figure 8: GSS-4 Composite Sample Pump Diagram
