Page 54 - CNG ESP Participant Guide2024
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Module 6: CNG Depressurizing and Defueling
Lesson 6.6: Methods of Defueling
Vehicle-to-Vehicle ▪ Pressure reduction strategy only
Transfer ▪ Transfers fuel from one vehicle to another
o Must have defuel port
o Transfer hose components
✓ High-pressure conductive hose
✓ Defuel nozzle
✓ Fuel nozzle
✓ Vehicle must be grounded
▪ May not totally defuel vehicle
Compressor Inlet ▪ Transfer fuel back to CNG station
Procedure ▪ CNG vehicle must have a defueling system
▪ Storage vessels must have room to accept the fuel
▪ Follow station defueling panel operating instructions
▪ Compressor must be on
Vent-to- ▪ Requirements
Atmosphere o Check with local air quality board
Procedure o Requires:
✓ Grounded, sealed connection
✓ Pressure regulation
✓ Fire extinguisher
▪ Two-inch pipe
▪ Equipped with valve and regulator to control flow
▪ Gastight connection to cylinder
▪ Grounded
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