tips and solutions FOR issues with TDW Pig-Sig V.
Pig passage indicators are commonly referred to as “PIG-SIGs,” a term TDW originated more than 60 years ago. They accurately detect pigs, spheres, scrapers, and other tools as they pass distinct points along the pipeline and when they reach the receiver, and can also alert operators if a pig is lost or stuck.
The weatherproof and corrosion-resistant PIG-SIG® V pig passage indicator is built to withstand most environments. All components exposed to pipeline products are completely sealed to prevent leaks.
PIG SIG V OPERATIONS GUIDE
NOTE: It is very important to read these troubleshooting guidelines in conjunction with the Pig Sig V Operating and Maintenance instructions PIG- SIG V Guide
ISSUE: The Plug assembly won’t thread on to the THREAD-O-RING ™ Nipple
Verify that it is indeed a TDW THREAD-O-RING. The hole in the pipe may be too small or not centered. The TDW THREAD-O-RING may be swedged due to over-tightening of a valve or cap. Measure the inside dimension (ID) to ensure it is not swedged or egged.
ISSUE: PIG-SIG V has never worked correctly
Verify that the proper TDW THREAD-O-RING was used to correspond with the wall thickness of the pipe. Measure the height of the THREAD-O-RING as it is mounted to the pipe and then add that measurement to the wall thickness of the pipe. The measurement should not exceed 4.50 inches but needs to be greater than 4.25 inches.
ISSUE: The Plug stopped working correctly
If the plug is contaminated, install a new filter pack version. If there is wax build up in the plug: consult with the TDW factory regarding other plug options.
If The Trigger is damaged, the first step is to verify that the proper TDW THREAD-O-RING was used for corresponding wall thickness of pipe. Measure the height of the TDW THREADO-RING as it is mounted to the pipe and then add that measurement to the wall thickness of the pipe. This measurement should not exceed 4.50 inches but needs to be greater than 4.25 inches.
The plug may have wax or other buildup that is preventing the trigger from moving. This can lead to the plug being damaged.
ISSUE Electrical or Combo Electrical switch is not sending electrical signal
Check for the proper switch adjustment. Please refer to electrical switch instruction in the manual and ensure that the switch is adjusted properly.
Ensure that the double torsion spring is still installed correctly.
Verify that the indicator is properly installed. Check the indicator installation by removing a set screw and looking for the groove on the plug.
Verify that the plug is fully installed. Measure the distance the plug extends above the THREAD-O-RING Nipple; the distance should be 1 3/8 inches.
In the event of freezing weather, the seal on the indicator may have been compromised allowing water to enter the upper position of the plug. This water can freeze and not allow the magnet to move.
ISSUE: Indicator - The All Types Flag doesn’t raise after assumed pig passage
Verify that the indicator is properly installed: check indicator installation by removing a set screw and looking for the groove on the plug.
Verify that the plug is fully installed: Measure the distance the plug extends above the THREAD-O-RING nipple (should be 1-3/8 inches).
In the event of freezing weather: the seal on the indicator may have been compromised allowing water to enter the upper portion of the plug. This water can freeze and not allow the magnet to move. Remove indicator and check for moisture.
IN THE EVENT OF FREEZING WEATHER:
Remove indicator to check for moisture. 65 Section VII – Maintenance Table 11. PIG-SIG V Maintenance Intervals Item Interval Seal Inspect every six months for tears or cracks.
Replace annually (order seal kit).
Magnet Inspect annually.
Replace if cracks or chips are present.
Indicator O-ring is recommended to be replaced annually.
Plug O-ring Inspect any time the plug is removed. Replace annually.
Plug Backup Ring should be replaced each time the plug is removed.
NOTE: Times may vary depending on the pipeline product and the environment that the unit is exposed to.
ISSUE:Flag does not raise after assumed pig passage/switch does not actuate or release (reset)
Proper switch adjustment: refer to electrical switch instruction in the manual and ensure the switch is adjusted properly. The gap between polymer slider and switch plunger should be between 0.005 and 0.02 inches (0.1 to 0.6mm).
To discuss issues with your Pig Sig V please contact any of the KERR team.
Kerr Engineered Sales Company has been representing leading pipeline repair and performance companies in Eastern US since the company was founded in 1952. Seventy years later, the company is still a family run business serving customers with the highest quality service and support.
