Page 55 - CNG/ LNG ESP Participant Guide 2024

Module 6: CNG Depressurizing and Defueling

Module 6: Knowledge Check

Defueling a CNG vehicle may become necessary when:
□ One or more cylinders have expired
□ Vehicle is being disposed of
□ A component must be replaced due to warranty, recall or failure
□ All of the above

All CNG trucks manufactured in 2013 or later must have defueling capabilities.
□ True
□ False

Defueling a CNG vehicle must be performed:
□ Indoors
□ Outdoors
□ In the morning
□ None of the above

The compressor inlet method for defueling a CNG vehicle requires:
□ A defueling system on the CNG vehicle
□ A defueling panel at the CNG station
□ Room in CNG station storage vessels to accept the fuel
□ All the above

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