Page 61 - CNG/ LNG ESP Participant Guide 2024
P. 61
Module 8: LNG Vehicle Systems and Safety Practices
LNG Enters the Tank
▪ LNG is pumped into the vehicle’s fuel tank through the fill connector
▪ Cold LNG travels into the top of the tank, cooling some of the vapor that has been
created by the natural warming of the LNG
▪ The tank fills to 90% of its total capacity, leaving room for vapor to accumulate
Vapor at the Top of
the LNG Tank
Creates Pressure
▪ If there is sufficient vapor in the top of the tank, the vapor travels through the
pressure control (economizer) valve and ultimately to the engine
▪ This process continues until enough of the vapor has been used that there is not
sufficient pressure (approximately 125 psi) for the economizer valve to remain open
NGV Essentials and Safety Practices (CNG & LNG) © 2024 AFVi All Rights Reserved Page 8-3
