BS EN 10217-3:2019 pdf free.Welded steel tubes for pressure purposes -Technical delivery conditions.
7.2.1 Tube manufacturing shall be as specified in Table 1.
Unless Option 1 is specified, the manufacturing process and route is at the discretion of the manufacturer.
Option 1: The manufacturing process and/or route from Table 1 is specified by the purchaser.
Electric welded tubes shall be manufactured by a process employing high frequency welding (HFWJ, of minimum frequency 100 kHz.
The submerged arc weld of SAW tubes shall be made using at least one weld run on the inside and one weld run on the outside of the tube.
The strip used for the manufacture of SAWH tubes shall have a width of not less than 0,8 times or more than 3,0 times the outside diameter of the tube.
The finished tubes shall not include the welds used to join together the strip or plate prior to forming, except for SAWH tubes to test category 1, where this is permitted only when the welding procedure for the weld joining the strip or plate has been qualified in accordance with Annex A and has also been subjected to the same inspection and testing regime as the helical pipe welds and base material to test category 2 (see 11.12.2.3).
7.2.2 Tube production welding shall be carried out by qualified personnel in accordance with documented procedures. For tubes to be used in pressure equipment under European legislation, manufacturers shall employ an established procedure for the approval of welding operatives.
7.2.3 The welding procedure for SAW tubes shall be qualified in accordance with Annex A.
7.2.4 The production (welding) process for HFW tubes shall be qualified and approved under the tube manufacturer’s own QA system. Only HFW tubes (see 3.4) shall be supplied for pressure equipment under European legislation.
7.2.5 The delivery conditions for tubes covered by this document are shown in Table 1.
7.2.6 For grades P355N and P355NH full body normalizing may be replaced by normalizing rolling or by a hot (stretch) reduction process carried out within the normalizing temperature range.BS EN 10217-3 pdf download.