AS 4627:2017 pdf download.Quick-connect devices for gas.
SECTION 2 DESIGN AND CONSTRUCTION
2.1 MATERIALS
2.1.1 Continuity of satisfactory operation Materials used in the construction of a quick-connect device shall be such that continuity of satisfactory operation can be expected during normal usage within the manufacturer’s specification.
2.1.2 Suitability of materials for conditions of use Materials and finishes, including dressings and lubricants, used in the construction, shall be suitable for the conditions of use (e.g. corrosion, temperature and handling).
2.1.3 Materials in contact with gas Materials in contact with the gas, including dressings, lubricants and jointing compounds, shall be suitable for use with all gases.
2.1.4 Melting point of materials The quick-connect device body(s), valve plugs, related structural components and retaining devices shall be made of materials with a melting point not less than 430°C.
2.1.5 Brass parts Brass parts shall be resistant to stress-corrosion cracking when tested in accordance with AS 2136.
2.1.6 Component parts niaterials selected to appropriate Standards Alloys used for component parts shall be selected from appropriate Australian Standards or their equivalent.
2.2 CONSTRUCTION
2.2.1 Continuity of satisfactory operation The construction of a quick-connect device shall ensure the continued safe operation of the unit during usage within the manufacturer’s specification.
2.2.2 Castings and hot pressings All castings and hot pressings shall be clean and sound, free from laps, blow holes and pitting and all surfaces not machine finished shall be clean, smooth and free from sand.
2.2.3 Sealing of porous castings or cracks Porous castings or cracks in gas-carrying parts shall not be sealed other than by an accepted method for the impregnation of castings, e.g. vacuum impregnation.
2.2.4 Assembled device to be clean The assembled quick-connect device shall not contain dirt, casting sand, swarf or other foreign matter. There shall be no excess diaphragm dressing or jointing compound in the device.
2.2.5 Accidental displacement of parts Every part of a quick-connect device shall be secure against accidental displacement and shall be constructed to maintain a fixed relationship between essential parts under normal and reasonable conditions of handling and usage so as to ensure continued performance in accordance with this Standard.
2.2.6 Springs Springs shall be resistant to corrosion. The ends of a helical spring shall be flat and in a plane perpendicular to the axis of the spring. The coils of a cylindrical helical spring shall not be able to overlap.
2.2.7 Securing of parts Adhesives shall not be used for securing parts together without additional mechanical fixing means, except for labels.
2.2.8 Sharp edges The constituent parts of a quick-connect device shall be free from sharp edges that may cause damage or injury.
2.2.9 Operating travel The operating travel of a quick-connect device shall be limited by fixed non-removable stops.
2.2.10 Holes for assembly or mounting Holes for screws, pins, etc., intended for the assembly of parts or for mounting of a quick-connect device shall not open into gasways and shall provide a minimum wall thickness of 1 mm from gasways.
2.2.11 Permanent sealing of non-functional holes Non-functional holes used for manufacture of a quick-connect device that form a passage between gasways and the atmosphere shall be permanently sealed by mechanical means.
2.2.12 Self-tapping screws Self-tapping screws, other than those that form a fully swaged machine type thread, shall not be used to secure together the external joint of a gas-carrying component that may be removed in servicing. The application of self-forming screws shall be limited to malleable materials and shall not result in deformation or cracking of the component.
2.2.13 Application of sealant Parts that require the addition of sealant to maintain gas tightness shall be capable of having the sealant added without dismantling the quick-connect device.
2.2.14 Construction of parts not covered by this Standard The construction of parts not covered by this Standard shall be in accordance with reasonable concepts of safety, substantiality and durability. The general assembly shall be of a neat and workmanlike character with all parts well fitted.
2.2.15 Tightening of a gland or any other adjustments The quick-connect device shall be so constructed that the tightening of a gland or any other adjustment shall not destroy the ability of the device to meet this Standard.
2.2.16 Incorrect assembly The construction of a quick-connect device shall be such that the mating parts cannot be assembled incorrectly.AS 4627 pdf download.