Page 19 - WM E-Learning Handbook
P. 19

Slide Topic                        Content                              Notes
Pressure Relief Device (PRD)
                                  Protects cylinder from
                                     rupture

                                  Vents gas in case of fire
                                  Designed to open, and stay

                                     open, in case of fire
                                  Activates at approximately

                                     219˚F
                                  Not repairable
                                  Matched to valve and

                                     cylinder

PRD Vent Lines                    Direct the flow of natural gas
                                     to open air, upward and away
                                     from the vehicle

                                  Stainless steel
                                  Vent caps required
                                  Marked with a color coded

                                     label to indicate no pressure
                                     in vent line

Manual Quarter-Turn Shut-Off      Normally installed on the
Valve                                FMM

                                  Can be used to shut off flow
                                     of gas to engine during
                                     service or in an emergency

High-Pressure Coalescing Filter   Removes liquid or aerosol
                                      Oil or water

                                  Removes particulates

                                  Follow manufacturer’s
                                     procedures

Fuel Shut-Off Solenoid            Prevents gas from flowing to
                                     the engine when the key is
                                     on but engine is not running

                                  Not repairable

Technician Safety and Awareness Training for NGVs  © 2018 NGVi All Rights Reserved         Page 17
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