BS EN 10217-7:2021 pdf free download – Welded steel tubes for pressure purposes一 Technical delivery conditions Part 7: Stainless steel tubes.
8.5.2 Internal soundness
8.5.2.1 General
The weld area shall be free from cracks, lack of fusion and lack of penetration.
8.5.2.2 Leak-tightness
The tubes shall pass a hydrostatic test (see 11.8.1) or eddy current test (see 11.8.2) or a test according
to another agreed method, to verify leak-tightness.
Unless Option 13 is specified, the choice of the test method is at the discretion of the manufacturer.
Option 13: The test method for verification of leak-tightness according to 11.8.1 or 11.8.2 is specified by the purchaser.
8.5.2.3 Non-destructive testing
The full length of the weld seam of tubes shall be submitted to a non-destructive testing for the detection of imperfections according to 11.11.1.
Option 14: The tubes of test category 2 shall be submitted to non-destructive testing for the detection of laminar imperfections at the tube ends according to 11.11.2.
Option 15: The edges of strip or plate used for the manufacture of tubes of test category 2 shall be submitted to non-destructive testing for the detection of laminar imperfections according to 11.1 1.3.
All NDT activities shall be carried out by qualified and competent level 1,2 and/or 3 personnel authorized to operate by the employer.
The qualification of NDT personnel shall be according to ISO 11484:2019 (see Note 2)
It is required that the level 3 personnel be certified according to EN ISO 9712:2012 (see Note 2). The operating authorization issued by the employer shall be according to a written procedure. All NDT operations shall be authorized by a level 3 NDT individual approved by the employer.
NOTE 1 The definition of level 1, 2 and 3 can be found in appropriate standards, e.g. EN ISO 9712 and ISO 11484.
NOTE 2 Other standards are accepted by agreement.
NOTE 3 When tubes are being used for pressure equipment in categories III and IV of European Legislation for pressure equipment, the personnel will be approved by a third-party organization.
8.6 Straightness
The deviation from straightness of any tube length L shall not exceed 0,00 1 5 L. Deviations from straightness over any one meter length shall not exceed 3 mm.
8.7 Preparation of ends
Tubes shall be delivered with square cut ends. The ends shall be free from excessive burrs. Option 16: Tubes with wall thickness  3,2 mm shall be delivered with bevelled ends (see Figure 1). The bevel shall have an angle a of(30 5)0 with a root face C of 1,6 mm ± 0,8 mm, except that for wall thickness greater than 20 mm, an agreed alternative bevel may be specified.
8.8 Dimensions, masses and tolerances
8.8.1 Outside diameter and wall thickness
Tubes shall be ordered by outside diameter D and wall thickness T. Preferred outside diameters D and wall thicknesses Tare given in EN ISO 1127:1996.
8.8.2 Mass
For the calculation of mass per unit length the density values given in EN 10088-1:20 14 shall be used.
8.8.3 Lengths
Unless Option 17 is specified, the tubes may be delivered in random lengths. The delivery range shall be agreed at the time of enquiry and order.
Option 17: The tubes shall be delivered in exact lengths and the length shall be specified at the time of enquiry and order. The tolerances on these lengths shall conform to 8.8.4.4.
8.8.4 Tolerances
8.8.4.1 Tolerance on outside diameter and on wall thickness
The diameter and the wall thickness of the tubes shall be within the relevant tolerance limits given in Table 10. Tolerance classes are according to EN ISO 1127:1996.