Page 64 - CNG/ LNG ESP Participant Guide 2024
P. 64
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
