Page 68 - CNG/ LNG ESP Participant Guide 2024
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Module 8: LNG Vehicle Systems and Safety Practices

             Methane Gas          While optional for CNG maintenance facilities,
             Detection Systems    methane gas detection systems are REQUIRED
                                  by code for all LNG maintenance facilities

                                  When present, the methane gas detection
                                  system detects methane at potentially unsafe
                                  levels inside a maintenance facility.  The
                                  methane gas detection system:

                                  ▪  Activates at 25% LFL and may perform some
                                    or all the following:
                                      o  Activates an exterior red light
                                      o  Activates internal audible/visual alarms
                                      o  Activates emergency exhaust fans
                                      o  Activates and opens make-up air (roll-up doors, etc.)
                                      o  Deactivates heating system
                                      o  Deactivates welding receptacles
                                      o  Notifies your organization’s security department
                                      o  Notifies fire department, if required

                Module 8: Knowledge Check

            Saturated LNG systems are those that use LNG that has been:
                □  Vented
                □  Frozen
                □  Stored
                □  Warmed

            LNG fuel systems operate at relatively low pressures.
                 □  True
                □  False

            One of the main differences between CNG and LNG vehicles is:
                 □  LNG vehicles cost more
                □  LNG vehicles vent regularly as a normal part of their operating process and CNG vehicles do not
                □  CNG vehicles vent regularly, and LNG vehicles do not
                □  CNG is unodorized and LNG is odorized












                                           NGV Essentials and Safety Practices (CNG & LNG)                            © 2024 AFVi All Rights Reserved    Page 8-10
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