Page 64 - AFVi CNG & LNG Participant Guide

Module 8: LNG Vehicle Systems and Safety Practices

Primary Pressure  Activates at 230 psi
Relief Valve  Prevents tank from over-pressurization
 Self-resetting

Secondary Pressure  Activates at 350 psi
Relief Valve  Redundant pressure relief
 If red cap is missing, do not refuel

Fuel Gauge Sender  Sends signal to the fuel gauge on dash of vehicle
to indicate the quantity of LNG in the tank(s)

Pressure Control  Supplies vaporized LNG to heat exchanger when
(Economizer) Valve excess head pressure exists in tank
 Controls flow toward engine
 Closes at ~125 psi

NGV Essentials and Safety Practices (CNG & LNG) © 2024 AFVi All Rights Reserved Page 8-6