Welker GSS-4PM, Installation, Operation And Maintenance Manual

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Constant Pressure Cylinder
11.
Allow full pipeline pressure to reach the GSS-4PM. Check for leaks and repair as necessary.
If the GSS-4PM is equipped with a standard probe, slowly open sample pump isolation valve D ( Figure 2 ).
If the GSS-4PM is equipped with the optional LE-2SSKO, slowly open inlet (P₁) valve A and return (P₂) valve B ( Figure 3 ).
12.
Read the pressure on the sample outlet pressure gauge ( Figure 2 or Figure 3 ). To determine the current inline relief
setting, subtract this pressure reading from the pipeline pressure.
When sampling into a Welker Constant Pressure Cylinder, the pressure gauge should read approximately 200 psig below
pipeline pressure at start-up.
13.
If the current inline relief setting is approximately 200 psig, the inline relief does not need to be adjusted; proceed to
step 22. If the current inline relief setting is anything other than approximately 200 psig, the inline relief must be
adjusted; continue to step 14.
14.
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 ).
15.
Remove the buttonhead screw and washer seal from the end of the base.
16.
Insert a hex key through the base to the spring adjuster.
17.
Turn the spring adjuster to adjust the spring tension.
When sampling into a Welker Constant Pressure Cylinder, the pressure gauge should read approximately 200 psig below
pipeline pressure at start-up.
To increase spring tension and raise the relief set point, turn the spring adjuster clockwise.
To decrease spring tension and lower the relief set point, turn the spring adjuster counterclockwise.
Each full clockwise turn of the spring adjuster increases spring tension approximately 100 psig.
18.
Replace the washer seal, and then return the buttonhead screw to the base.
19.
Allow full pipeline pressure to reach the GSS-4PM.
If the GSS-4PM is equipped with a standard probe, slowly open sample pump isolation valve D ( Figure 2 ).
If the GSS-4PM is equipped with the optional LE-2SSKO, slowly open inlet (P₁) valve A and return (P₂) valve B ( Figure 3 ).
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IOM-022 MODEL: GSS-4PM REV: F 13839 West Bellfort Street, Sugar Land, TX 77498 welker.com Service Department 281.491.2331