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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

























                                           NGV Essentials and Safety Practices (CNG & LNG)                            © 2024 AFVi All Rights Reserved    Page 6-7
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