AS 5092:2009 pdf free download – CNG refuelling stations
2.5.1 General
All valves, pipes and components such as strainers, compression fittings and no break couplings, separator bodies and similar fittings shall have a rated pressure in excess of the maximum pressures that can occur in the locations where used. In addition, materials, especially elastomers, shall be suitable for use with compressed natural gas. The manufacturer shall stamp, or otherwise permanently mark, valves and components to indicate the manufacturer’s name or trademark and part number. Isolating valves shall operate with a quarter turn from open to closed.
2.5.2 Gas inlet train
Valves and components up to and including the appliance valve(s) shall be in accordance with AS 5601.
2.5.3 Valves and components for the compressor skid
From the compressor inlet to the non-return valve at the end of the compressor outlet flexible piping, valves and components shall comply with the compressor manufacturer’s standard practice.
2.5.4 Pressure valves
Cylinder valves shall comply with AS 2473.1 or an equivalent Standard.
2.6 SAFETY DEVICES FOR PRESSURE PROTECTION
Spring controlled pressure relief valves shall—
(a) be clearly marked by their manufacturer or agent with the pressure at which they are set to start to discharge;
(b) have a rated discharge capacity greater than the input capacity from the system; and
(c) not be fitted with lifting devices to prevent tampering by unauthorized persons; and
(d) incorporate a means for adjusting the pressure set point that can be sealed.
2.9 REFUELLING HOSE ASSEMBLIES
Hose assemblies shall have rated pressures in excess of the maximum that can occur in the refuelling process for which they are to be used. These hose assemblies shall consist of—
(a) a refuelling hose complying with Clause 2.4.4 with appropriate end connections for attachment to the other hose assembly components. Hose assemblies shall be hydrostatically tested, after assembly and prior to use, to at least twice the maximum operating pressure for a minimum of 1 min. The hose assembly shall not leak, burst or suffer damage from pressurization when hydrostatically tested;
(b) a refuelling nozzle (see Clause 2.10) either as a separate refuelling nozzle or combined with a refuelling valve;
(c) a refuelling valve, which shall incorporate a means of depressurizing the refuelling connector to enable separation of the refuelling hose from the vehicle being filled;
(d) breakaway couplings in accordance with Clause 2.11; and
(e) a vent hose to convey the gas released from the operation of depressurizing the refuelling connector to a safe place.
NOTE: Items (c) and (e) may not be required if the dispenser automatically depressurizes the refuelling nozzle and hose at the end of the fill.
2.10 REFUELLING CONNECTORS
Refuelling connectors shall have rated pressures in excess of the maximum that can occur in the refuelling process for which they are to be used. They shall consist of refuelling nozzles and refuelling receptacles specifically designed for compressed natural gas service. The refuelling connector shall enable gas to be transferred to the vehicle gas containers of the vehicle being filled. When separated, the refuelling nozzle and refuelling receptacle shall be self-sealing. The refuelling nozzle shall be fitted to the refuelling hose assembly and the corresponding refuelling receptacle shall be fitted to the vehicle to be filled. For depot-based refuelling stations located on private property not available for use by the public, the type and size of refuelling connector shall be as chosen by the station owner or operator. For public refuelling stations, the refuelling connector shall meet the requirements of ISO 14469 (all parts).