Page 65 - CNG/ LNG ESP Participant Guide 2024

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

NGV Essentials and Safety Practices (CNG & LNG) © 2024 AFVi All Rights Reserved Page 8-7