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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                                  © 2019 NGVi All Rights Reserved   Page 6-2
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