CSA ANSI NGV 4.1:2018 pdf free download – Natural gas vehicle (NGV) dispensing systems
Hose breakaway device — a component installed downstream of the dispenser outlet connection to protect the dispenser assembly from damage by vehicles driving away while still connected to the dispenser nozzle. Housing — a section of the system that encloses, and is intended to protect, operating parts, control mechanisms, or other components, that need not be accessible during normal operation. Hydrostatic pressure — the hydraulic pressure to which a component is subjected during testing. Hydrostatic test — the hydraulic pressure to which a component is taken during acceptance testing. Kiosk — a structure having an area of less than 9.24 m 2 (100 ft 2 ) located on a remote dispenser island, which provides shelter and contains the necessary equipment to permit a person to perform their duties and is not considered a building. Listed — equipment or materials included in a list published by an organization acceptable to the authority having jurisdiction and concerned with product evaluation that maintains periodic inspection of production of listed equipment or materials and whose listing states either that the equipment or materials meets appropriate standards or has been tested and found suitable for use in a specified manner. Manufacturer — the person or organization responsible for the design, fabrication, and testing of the equipment and components. Maximum allowable working pressure — the maximum pressure to which a component is designed to be subjected when handling the specified fluid at the maximum specified temperature. NGV — as used in this Standard, NGV indicates a natural gas vehicle. (In the United States of America, the term NGV is frequently applied to the natural gas vehicle, i.e., the mobile unit itself rather than the fuel.) Natural Gas stored in a gaseous state to be used as engine fuel for a highway vehicle.
4.1 A component used in compressed natural gas dispensing equipment shall either be listed by a nationally recognized testing agency as complying with an applicable standard, or shall be evaluated by the testing agency for the intended application as part of the dispensing equipment.
4.2 The construction of all parts of a compressed natural gas dispenser, whether specifically covered in this Standard or not, shall be in accordance with reasonable concepts of safety, durability, and maintainability.
4.3 All components used in a dispenser shall be assembled in such a manner so as to be secured against distortion, warping, or other damage, and shall be supported to maintain a fixed relationship with each other.
4.4 All parts, which may be contacted during normal servicing, shall be free from sharp projections or edges, and projecting screw ends.
4.5 All components shall be accessible for normal servicing and functional adjustment in position, and shall be replaceable during normal servicing.
4.6 A dispenser shall have provisions for operation in conjunction with an Emergency Shut-Down Device (ESD). Activation of the ESD shall cause the dispenser to disable the flow of gas to the vehicle, and shall shut off the electrical supply to the dispenser (see Clause 6.6).
4.7 In the event of a loss of electrical power during a fueling operation, the flow of gas to the fueling connection shall be shut off automatically, and the natural gas dispenser shall shut down in a safe manner. A manual restart shall be required for the dispenser to resume operation.
4.8 Dispensers for outdoor installation shall be equipped with a means to protect all operating controls and electrical wiring from climatic conditions (see Clause 6.13).