Page 65 - CNG/ LNG ESP Participant Guide 2024
P. 65
Module 8: LNG Vehicle Systems and Safety Practices
Internal Check ▪ Located inside plumbing manifold on tank
Valve ▪ Provides 2 psi back pressure
▪ Assists Pressure Control Regulator in rapidly
reducing tank pressure
Engine Coolant Heat
Exchanger
▪ Uses heat from engine coolant for warming
▪ Warms LNG, changes state from liquid to gas
LNG Over-Pressure ▪ Regulates maximum pressure to engine fuel
Regulator inlet
▪ Typically set at 125 psi
▪ May be externally adjustable
Automatic Fuel ▪ Shuts off fuel to engine when ignition is off
Shutoff Valve o Activated by sensor
▪ On integrated tanks
o Valve is either located directly after the fuel vaporizer/heat exchanger or after
the overpressure regulator
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