T.D.Williamson (TDW)

Model TDW PIG-SIG - Passage Indicator Brochure

Easy to install and simple to use, the TDW PIG-SIG IV Passage Indicator detects – and signals – the passage of pigs or spheres at predetermined intervals along a pipeline. That allows operators to know the general location of a pig or sphere andbe alerted if it’s lost or stuck.