BS EN 10217-4 pdf free download

BS EN 10217-4 pdf free download. Welded steel tubes for pressure purposes – Technical delivery conditions.
7 Manufacturing process 7.1 Steelmaking process The steelmaking process is at the discretion of the manufacturer with the exception that the open hearth (Siemens-Martin) process shall not be employed unless in combination with a secondary steelmaking or ladle refining process. Steels shall be fully killed and contain nitrogen binding elements, details of which shall be reported. NOTE This excludes the use of rimming, balanced or semi-killed steel. 7.2 Tube manufacture and delivery conditions 7.2.1 The tubes shall be manufactured by an electric welding process employing high frequency welding (HFW), of minimum frequency 100 kHz in accordance with one of the manufacturing routes specified in Table 1. Unless Option 1 is specified the manufacturing route is at the discretion of the manufacturer. Option 1: The manufacturing route from Table 1 is specified by the purchaser. The finished tubes shall not include the welds used to join together the lengths of the strip prior to forming. 7.2.2 Tube production welding shall be carried out by suitably qualified personnel in accordance with documented procedures. For tubes intended for use in pressure equipment under European legislation，manufacturers shall employ an established procedure for the approval of welding operatives. The production (welding) process for HFW tubes shall be qualified and approved under the tube manufacturer’ s own QA system. 7.2.3 The delivery conditions of tubes covered by this document are shown in Table 1.7.3 Non Destructive Testing Personnel Requirements 7.3.1 All NDT activities shall be carried out by qualified and competent level 1, 2 and/or 3 personnel, authorized to carry out this work by the employer. 7.3.2 The qualification for levels 1 and 2 personnel shall be in accordance with ISO 11484 or, at least, an equivalent to it. 7.3.3 It is recommended for the level 3 personnel to be suitably certified, either in accordance with EN ISO 9712 or, at least, an equivalent to it. 7.3.4 The operating authorization issued by the employer shall be in accordance with a written procedure. 7.3.5 All NDT operations shall be authorised by a level 3 NDT technician approved by the employer. NOTE The definition of levels 1, 2 and 3 can be found in appropriate standards, e.g. EN ISO 9712 and ISO 11484. 8 Requirements 8.1 General The tubes shall conform to the requirements of this document when supplied in a delivery condition in accordance with Table 1 and inspected in accordance with the specified requirements in Table 10. Tubes shall be suitable for hot and cold bending. In addition, the general technical delivery requirements specified in EN 10021 shall apply. 8.4.2.3 It shall be permissible to dress, only by grinding or machining, surface imperfections provided that after doing so, the wall thickness in the dressed area is not less than the specified minimum wall thickness. All dressed areas shall blend smoothly into the contour of the tube. 8.4.2.4 Any surface imperfection, which is demonstrated to be deeper than 5 % of the wall thickness T or 3 mm, whichever is the smaller, shall be dressed. 8.4.2.5 Surface imperfections which extend below the specified minimum wall thickness shall be considered defects and tubes containing these shall be deemed not to conform with this document and shall be rejected. 8.4.3 Internal soundness 8.4.3.1 Leak tightness The tubes shall be assessed for leak tightness by either a hydrostatic test (see 11.9.1) or an electromagnetic test (see 11.9.2]. Unless Option 4 is specified, the choice of the test method is at the discretion of the manufacturer. Option 4: The test method for verification of ‘leak-tightness in accordance with 11.9.1 or 11.9.2 is specified by the purchaser. 8.4.3.2 Non-Destructive Testing The full length of the weld seam of tubes of test category 1 shall be subjected to Non-Destructive Testing for the detection of imperfections in accordance with 11.12.1. .BS EN 10217-4 pdf download.