TDW Pig Sig V
PIG-SIG® V Scraper Passage Indicator is a device installed at prescribed intervals on pipelines to detect the passage of a pig or sphere. The most common indicators have a trigger extending into pipelines through a welded fitting, or nipple that has been tapped. When a pig passes, the trigger is tripped which immediately activates a signaling mechanism.
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.
Standard PIG-SIG V passage indicators are built to withstand the most brutal offshore/onshore environments. Each PIG-SIG V indicator is weatherproof and corrosion-resistant. All components exposed to pipeline products are completely sealed to prevent leakage and are NACE compatible. Components exposed to the atmosphere are 316 stainless steel except the microswitch (on electrical models) which is aluminum with a protective powder coating. The flag indicator offers high visibility. Because the triggering toggle that extends into a pipe is omni- directional, it does not require adjustments after it is set. This means the flag can be oriented to face any desired direction. The carbon steel nipple is manufactured from easily weldable material. PIG-SIG indicators can be installed on or removed from a pressured pipeline by using a TDW T-101 Tapping Machine and accessories.
