Page 36 - AFVi CNG & LNG Participant Guide

Module 4: NGV Safety Practices and Procedures

Safety Practices for  Use welding blanket to protect CNG fuel system components
Welding and Hot
Work

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

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