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Aluminum Long Trigger Thermal PRD

2ND GENERATION / LT162 SERIES / 5,000 PSI / 4 – 45′

Long Trigger PRD for CNG Gas


The Viper is Emcara’s 2nd generation family of thermally activated, Long Trigger Pressure Relief Device with lengths from 4’ to 45’. Complete with anodized aluminum body, the Viper is designed for systems with working pressures up to 5,000psi. When fire is concerned, it is important to vent gas as quickly as possible to avoid the risk of a tank rupture. The Viper benefits from an advanced trigger mechanism and provides high flow rates when venting.


The internal mechanism utilized in the Viper PRD is robust, and possesses enhanced corrosion resistance, performing in the most challenging conditions. With a substantial length range; superior fire detection (when compared to single or multiple point PRD’s) can be achieved while providing cost savings and design flexibility.


Gas Type: CNG
Certified to ANSI/CSA PRD1-2013
Pressure: 5,000 psi nominal
Activation Temperature: ~130 ºC
Activation Time: ~25 seconds
Flow Rate: 90 SCFM (per PRD1/ISO15500)
Minimum Exposure Length: 5″ – 18″
Length: 48″ – 540″
Body Size: 2″ x 2″ x 1.25″
Tank Thread (End-Boss Version): 1 1/8″
Inlet Connection: SAE J1926-6 Port
Outlet Connection: SAE J1926-8 Port
Body Construction: Anodized Aluminum

Emcara PRD Safety

Viper Aluminum Long Trigger Thermal PRD for CNG Gas
Viper Aluminum Long Trigger Thermal PRD for CNG Gas Drawing
  • Detects localized fire anywhere along the length of the PRD trigger
  • Vents contents when exposed to fire or heat
  • Can be interconnected for wide area protection or higher flow