BS EN 12493-2020 LPG equipment and accessories – Welded steel pressure vessels for LPG road tankers一Design and manufacture.
4 Materials
4.1 Environmental The manufacturer shall endeavour to acquire materials and components from suppliers who have a declared environmental policy, see EN ISO 14021. EN IS0 14024 and EN ISO 14025.
4.2 Suitability
4.2.1 Unless otherwise specified by the design documents, the design temperature range shall be -20 C to +50°C.
4.2.2 The materals of construction shall be suitable for operating within the envisaged temperature range. II the pressure vessel could be sublected to more severe lower amblent or product temperatures, the design temperature range shall be -40 °C to +50 C.
4.2.3 Guidance on selection of material grades is given in Annex A
4.2.4 If additional impact testing is required, it shall be carried out in accordance with EN IS0 148-1 to achieve the impact values specified in
4.2.5 The materials of the pressure receptacle which are in contact with the contents shall not contain substances liable to substantially weaken the material. The steel grades specified in EN 10028-2 and EN 10028-3. listed in Table A.1, are considered compatible with LPG complying with the limitations on corrosiveness as specifed in IS0 9162.
4.3 Pressure retaining parts Pressure-retaining materials shall be of appropriate steels conforming to EN 10028-2 or EN 10028-3 or shall confom to specifications agreed with the competent authority. All materials shall conform to 102.4 and the ratio of the specifed yield strength (R) to minimum tensile strength (Rm) shall not exceed 0.85 (Le. ReH/Rm s 0,85). The percentage elongation at fracture shall be not less than 10 000 divided by the actual tensile strength in N/mm4, and in any case shall be not less than 16 % for fine grained steels and not less than 20 % for other steels. Where fine grain steels are used, the guarantee yield strength, Re shall not exceed 460 N/mm and the upper tensile strength, Rw shall not exceed 725 N/mm*.
4.4 Non-pressure retaining parts Non-pressure retaining parts that are directly welded to pressure retaining parts shall be of suitable materials conforming to EN 10025-2 or materials with characteristics approved by a competent authority. All materials used for non-pressure retaining parts shall be compatble with the material of pressure retalning parts, and shall conform to the impact requirements of, tested In accordance with the method specfhed In EN Is0 148-1.
4.5 Welding consumables Welding consumables shall be able to provide consistent welds with properties at least equal to those specihed for the parent materials in the finished pressure vessel.BS EN 12493 pdf pdf download.