TDW’s PIG-SIG® V Scraper Passage Indicator is a device installed at prescribed intervals on pipelines to detect the passage of a pig or sphere. Most common passage indicators function by extending a unidirectional or bidirectional trigger into pipelines through a welded fitting or nipple that has been tapped. When a pig passes an indicator, the trigger is tripped which immediately activates a signaling mechanism. The PIG-SIG® V indicator comes with a standard omnidirectional trigger that is easier to install and all but eliminates trigger breakage.
Signaling systems available with the PIG-SIG® V include a flag indicator, an electrical indicator or a flag/electrical indicator. All are compatible with all standard THREAD-O-RING™ nipples previously sold by TDW and are interchangeable. This makes it possible to order the PIG-SIG® V unit as an upgrade conversion kit without nipple, or as a new installation kit complete with nipple.