BS EN 12480:2018 pdf download

BS EN 12480:2018 pdf download.Gas meters – Rotary displacement gas meters
1 Scope
This European Standard specifies ranges, construction, performances, output characteristics and testing of rotary displacement gas meters (hereinafter referred to as RD meters or simply meters) for gas volume measurement.
This European Standard applies to rotary displacement gas meters used to measure the volume of fuel gases of at least the 1st, 2nd and 3rd gas families, the composition of which is specified in EN 437:2003+A1:2009, at a maximum working pressure up to and including 20 bar over an ambient and gas temperature range of at least -10 °C to +40 °C.
This European Standard applies to meters that are installed in locations with vibration and shocks of low significance (class M1) and in closed locations (indoor or outdoor with protection as specified by the manufacturer) with condensing or with non-condensing humidity or, if specified by the manufacturer,open locations (outdoor without any covering) with condensing humidity or with non-condensing humidity,and in locations with electr omagnetic disturbances [class E1 and E2]. The standards apply to mechanical meters with mechanical index, electronic devices are not covered by this standard.Unless otherwise specified in this standard:
一all pressures used are gauge;
一all influence quantities, except the one under test, are kept relatively constant at their reference value.
The risk philosophy adopted in this standard is based on the analysis of hazards including pressure. The standard applies principles to eliminate or reduce hazards. Where these hazards cannot be eliminated appropriate protection measures are specified.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 485-2:2013, Aluminium and aluminium alloys 一Sheet, strip and plate- Part 2: Mechanical properties
EN 586-2:1994, Aluminium and aluminium alloys 一Forgings 一Part 2: Mechanical properties and additional property requirements
EN 754-2:2016, Aluminium and aluminium alloys – Cold drawn rod/bar and tube一Part 2: Mechanical properties
EN 755-2:2013, Aluminium and aluminium alloys 一Extruded rod/bar, tube and profiles – Part 2:Mechanical properties
EN 1057:2006+A1:2010, Copper and copper alloys一Seamless, round copper tubes for water and gas in sanitary and heating applications
EN 1092-1:2007+A1:2013, Flanges and their joints – – Circular flanges for pipes, valves, fittings and accessories, PN designated一Part 1: Steel flanges
EN 1092-2:1997, Flanges and their joints一Circular flanges for pipes, valves, fittings and accessories, PN designated一Part 2: Cast iron flanges
EN 1092-3:2003, Flanges and their joints一Circular flanges for pipes, valves, fittings and accessories, PN designated – Part 3: Copper alloy flanges
EN 1092-4:2002, Flanges and their joints一Circular flanges for pipes, valves, fittings and accessories, PN designated一Part 4: Aluminium alloy flanges