T.D.Williamson (TDW) products

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 the most brutal environments, both onshore and topside. In addition, all components exposed to pipeline products are completely sealed to prevent leaks.

Easy to install and simple to use, the PIG-SIG® IV Passage Indicator accurately detects pigs, spheres, scrapers, and other tools as they pass distinct points along the pipeline and when they reach the receiver. That allows operators to know the general location of a pig and be alerted if it’s lost or stuck.