Inspect for any physical damage Pig signalling switches functional testing #instrumentation #instrumentationtools 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.
PIG-SIG® IV | T.D. Williamson
A pig signal detector is a mechanical switch to verify that a pig has left the launcher or has entered the receiver
Can also be used to provide a discrete input (di) into the plc for automated pigging.
Once installed, the pig signaller should be tested to ensure that it is working properly This may include a functional test or a pressure test. Complete guide to pig signallers and detectors Introducing a new way to approach critical isolation challenges shaped by what operators need most in the field
