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Aluminum Long Trigger Thermal PRD

LT22X SERIES / 10,000 PSI / UP TO 45′

Long Trigger PRD for Hydrogen Gas


As the use of Hydrogen gained momentum, it was a natural progression for Emcara to create a Long Trigger, Hydrogen ready thermally activated Pressure Relief Device (HPRD). Our 10,000 psi PRD is the only thermally activated, Long Trigger Pressure Relief Device specifically designed for use with Hydrogen systems. Available in trigger lengths up to 45′. Surface finishes, material treatments and internal mechanisms are designed to prevent Hydrogen embrittlement and operate at the higher pressures that are inherent with Hydrogen systems.


Trigger lengths are comparable with Emcara’s Viper PRD (up to 45 feet). Every 10,000 psi pressure relief device is tested for dimensional compliance and to exacting performance standards.


Gas Type: Hydrogen
Pressure: 10,000 psi nominal
Activation Temperature: 110 ºC
Activation Time: 30 seconds
Flow Rate: 970 SLPM (per HPRD1)
Minimum Exposure Length: 12″
Body Size: 1.5″ x 2″ x 2.25″ / 37mm x 51mm x 57mm
Inlet Connection: 9/16” HP Port
Outlet Connection: SAE J1926-8 Port
Body Construction: Blue Anodized Aluminum

Tests that have been performed on Emcara’s Hydrogen PRD:

  • Cycle test with Nitrogen at 13,500 psi
  • Hydro test at 22,500 psi
  • Drop test based on HPRD1
  • Bonfire test with a 1 m long trigger line with Nitrogen & Hydrogen
  • Thermal activation test with Hydrogen
  • Leak test based on HPRD1 with Hydrogen and Nitrogen

Tests that have been conducted on trigger mechanism
(All tests based on PRD1 Standard):

  • Accelerated life test
  • Accelerated cyclic corrosion test
  • Automotive fluid exposure
  • Atmospheric exposure
  • Drop and vibration test
  • Bench top activation test
Hydro Aluminum Long Trigger Thermal PRD for Hydrogen Systems
Aluminum Long Trigger Thermal PRD

Emcara PRD Safety

  • 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