Page 38 - ESP (CNG) Participant Guide

Module 4: NGV Safety Practices and Procedures

Module 4: Knowledge Check

NGV industry best practice recommends inspection of the entire CNG fuel system:
□ Every 3 years or 36,000 miles (light-duty vehicles)
□ After any fire or accident
□ At least every 12 months (medium- and heavy-duty vehicles)
□ All of the above

It is unsafe to bring a known leaking vehicle inside a maintenance facility; leaking vehicles should remain outdoors.
□ True
□ False

Signs of a gas leak on a CNG vehicle include:
□ Hearing a hissing sound
□ Smelling the “rotten egg” odor
□ Formation of ice around a fitting
□ All of the above

The first step when servicing the CNG fuel system on a natural gas vehicle is to:
□ Defuel the vehicle
□ Identify the component and determine whether it is a high- or low-pressure component
□ Turn off the gas supply
□ Check the methane detection system

The most common safety practice when welding on or in close proximity to natural gas vehicles is to:
□ Conduct welding outdoors
□ Check the methane detection system
□ Protect the CNG fuel system components with a welding blanket
□ None of the above

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