BS EN ISO 9809‑3:2019 pdf – Gas cylinders — Design, construction and testing of refillable seamless steel gas cylinders and tubes Part 3: Normalized steel cylinders and tubes.
1 Scope This document specifies minimum requirements for the material, design, construction and workmanship, manufacturing processes, examination and testing at the time of manufacture for refillable seamless steel gas cylinders and tubes with water capacities up to and including 450 l. It is applicable to cylinders and tubes for compressed, liquefied and dissolved gases and for normalized or normalized and tempered steel cylinders and tubes. 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. ISO 148‑1, Metallic materials — Charpy pendulum impact test — Part 1: Test method ISO 6506‑1, Metallic materials — Brinell hardness test — Part 1: Test method ISO 6508‑1, Metallic materials — Rockwell hardness test — Part 1: Test method ISO 6892‑1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature ISO 9712, Non-destructive testing — Qualification and certification of NDT personnel ISO 10286, Gas cylinders — Terminology ISO 9809‑1, Gas cylinders — Design, construction and testing of refillable seamless steel gas cylinders and tubes— Part 1: Quenched and tempered steel cylinders and tubes with tensile strength less than 1 100 MPa ISO 11114‑1, Gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 1: Metallic materials ISO 11114‑4, Transportable gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 4: Test methods for selecting steels resistant to hydrogen embrittlement ISO 13341, Gas cylinders — Fitting of valves to gas cylinders ISO 13769, Gas cylinders — Stamp marking 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 10286 and the following apply.
5 Inspection and testing Assessment of conformity to this international standard shall take into account the applicable regulations of the countries of use. To ensure that cylinders conform to this document, they shall be subject to inspection and testing in accordance with Clauses 9, 10 and 11. Tests and examinations performed to demonstrate compliance with this document shall be conducted using instruments calibrated before being put into service and thereafter according to an established programme. 6 Materials 6.1 General requirements 6.1.1 Materials for the manufacture of normalized or normalized and tempered gas cylinders shall be those generically classified as carbon-steels or carbon-manganese steels. The maximum actual tensile strength, R ma , for cylinders made from those steels shall not exceed 800 MPa. Other steels specified in ISO 9809‑1 or ISO 9809‑2 for quenched and tempered cylinders may be used and subjected to normalizing and tempering as specified in 6.3 provided that they additionally pass the impact test requirements given in ISO 9809‑1, and the maximum actual tensile strength, R ma , does not exceed 950 MPa. The steel used shall fall within one of the following categories: a) internationally recognized cylinder steels; b) nationally recognized cylinder steels; c) new cylinder steels resulting from technical progress. 6.1.2 The material used for the manufacture of gas cylinders shall be steel, other than rimming quality, with non‑ageing properties and shall be fully killed with aluminium and/or silicon. If only aluminium is used for killing, the metallic aluminium content shall be at least 0,015 %. Where examination of this non‑ageing property is required by the customer, the criteria by which it is to be specified should be agreed with the customer and inserted in the order. 6.1.3 The cylinder manufacturer shall establish means to identify the cylinders with the cast of steel from which they are made.
6.1.4 Grades of steel used for cylinder manufacture shall be compatible with the intended gas service, e.g. corrosive gases, embrittling gases (see ISO 11114‑1 and ISO 11114‑4). 6.1.5 Wherever continuously cast billet material is used, the manufacturer shall ensure that there are no deleterious imperfections (porosity) in the material to be used for making cylinders (see 9.2.4). 6.2 Controls on chemical composition 6.2.1 The chemical composition of all steels shall be defined at least by: — the carbon, manganese and silicon contents in all cases; — the chromium, nickel and molybdenum contents or other alloying elements intentionally added to the steel; — the maximum sulfur and phosphorus contents in all cases. The carbon, manganese and silicon contents shall be given, with tolerances, such that the differences between the maximum and minimum values of the cast do not exceed the values shown in Table 1.