Page 47 - WM E-Learning Handbook

Slide Topic Content Notes

LNG Overpressure  Regulates maximum pressure to
Regulator engine fuel inlet

 Typically set above the fuel tank
economizer setting between 130-
140 psi

 May be externally adjustable

Automatic Fuel Shutoff  Shuts off fuel to engine when
Valve  ignition is off
 activated by sensor

 On integrated tanks
 Valve is either located directly
after the fuel vaporizer/heat
exchanger or after the
overpressure regulator

General LNG Safety  Do not park LNG vehicle in
Precautions unmodified maintenance facility

 Always ensure tank pressure is
below 150 psi before bringing
vehicle indoors

 Always wear proper eye and skin
protection while working around
LNG fuel systems and vent
locations

If You Detect an LNG Leak  Move or leave the vehicle outdoors
 Identify the source of the leak
 Repair according to manufacturer’s

procedures

Safety Practices for Welding  Use welding blanket to protect LNG

and Hot Work fuel system components when

welding on or around LNG vehicles

Two LNG Defueling  Vent-to-Atmosphere
Methods
 Liquid Transfer
 Into LNG tank
 Can transition to gas
 Can recover some amount of

liquid

Technician Safety and Awareness Training for NGVs © 2018 NGVi All Rights Reserved Page 45