AS 5092:2009 pdf free
AS 5092:2009 pdf free.CNG refuelling stations
Where an unloading/blow down system is incorporated the blown down gas shall be returned to the compressor inlet and be designed to ensure that the rated pressure of the inlet system is not exceeded.
Each stage shall be fitted with a spring-loaded relief valve sized for the compressor capacity. The set pressure shall exceed the operational discharge pressure of the associated stages to the extent necessary to avoid discharge in normal service (typically 15% for inter stage and 10% for final stage relief valves) but shall not exceed the respective design rated pressures.
Gas compressors shall be fitted with indicators to monitor the following:
(a) Gas pressure(s)- A pressure gauge that complies with Clause 2.7 shall be fitted after each stage of gas compression.
(b) Lubricating oil pressure(s) (if applicable)- Equipment utilizing pressure lubrication system(s) shall be fitted with an oil pressure gauge (or gauges).
(c) Crankcase pressure (if applicable)- Compressors with a crankease operating under positive pressure should be fitted with a crankcase pressure gauge.
(d) Temperature(s)- Temperature measurement shall be provided on the outlet of the compressor.
(e) Oil level(s)- Provision shall be made to indicate all oil level(s).
(f) Provision shall be made to indicate ‘hours run’.
Piping and hoses from the flexible hose at the compressor inlet connection, between compression stages, coolers and separators and up to the non-return valve at the end of the compressor outlet flexible piping,shall be in accordance with the compressor manufacturers’standard practice. The piping used shall have a rated pressure in excess of the maximum pressures that can occur in the locations where the piping is used.
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.AS 5092 pdf free download.
