Page 36 - CNG/ LNG ESP Participant Guide 2024
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Module 4: NGV Safety Practices and Procedures
Safety Practices to ▪ Identify the component you are servicing and determine whether it is a high- or low-
Address Pressure pressure component
▪ NEVER put a wrench on a pressurized fitting
▪ Turn off gas supply to appropriate section of the fuel system
▪ Depressurize the work area and/or defuel the fuel system
▪ Do not perform work on any fuel system component near any ignition source
o Including, but not limited to, welding, cutting, power tools, cell phones,
computers, etc.
▪ NEVER perform maintenance on a leaking vehicle
o Sparks from cordless electric tools can act as an ignition source and start a fire
▪ ALWAYS follow manufacturer’s procedures for servicing, repairing or defueling NGVs
Safety Practices for ▪ Hot work or welding must be completed outdoors unless the facility has been
Welding and Hot modified
Work ▪ Vehicle must be defueled
▪ Be aware of adjacent vehicles or team members
▪ Use welding blanket to protect CNG fuel system components
If Your Facility Has a
Methane Gas
Detection System
When present, the methane gas detection system detects methane at potentially unsafe
levels inside a maintenance facility. The methane gas detection system:
▪ Activates at 25% LFL and may perform some or all the following:
o Activates an exterior red light
o Activates internal audible/visual alarms
o Activates emergency exhaust fans
o Activates and opens make-up air (roll-up doors, etc.)
o Deactivates heating system
o Deactivates welding receptacles
o Notifies your organization’s security department
o Notifies fire department, if required
NGV Essentials and Safety Practices (CNG & LNG) © 2024 AFVi All Rights Reserved Page 4-3
