TDW PIG-SIG V, Operating And Maintenance Instructions Manual

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Section VII – Maintenance
1.0
Preventative
Maintenance
1.0 PREVENTATIVE MAINTENANCE
Once properly set in the line, the PIG-SIG V indicator
is relatively maintenance-free. Routine inspection of
existing PIG-SIG V Scraper Passage Indicators is
important to continued proper operation. If your PIG-
SIG V unit is not working properly (indicating pig
passage) or has worked but is not working currently,
refer to troubleshooting guide in this section.
The flanged PIG-SIG V does not require any further
maintenance beyond that of a standard PIG-SIG V.
Refer to operator maintenance schedules for the
flange bolt torque values.
1.1 Flag Operation
Ensure the flag is properly positioned. When looking
at the TDW flag, the flag should be in the horizontal
position (Figure 7.1). This is the proper position
before pig passage. Once the pig has passed, the
flag should raise. The flag will need to be reset before
the next pig passage.
Figure 7.1. Horizontal Flag
1.2 Product Leakage
If there is product seepage around the flag indicator,
there is a leak around the plug O-ring. The PIG-SIG
V plug should be removed and the O-ring replaced.
For plug removal procedures, refer to
Section III
Pipeline Under Pressure.
If there is potential for
product contamination (wax, sand, etc.) in the trigger
housing, the plug should be removed and the trigger
cavity cleaned in warm, soapy water of a mild solvent
that is compatible with the PTFE component inside
the housing.