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Module 6: CNG Depressurizing and Defueling

           Lesson 6.1: Depressurize or Defuel

             Depressurize or        Depressurize
             Defuel?                  o  If repair is downstream of the fuel system isolation valve or the component can
                                         be isolated by the closing the cylinder valve
                                    Defuel
                                      o  If the gas supply cannot be isolated by closing the cylinder valve


































































                                     NGV Essentials and Safety Practices (CNG)                           © 2023 NGVi All Rights Reserved   Page 6-2
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