EN 10217-7-2014 pdf download.Welded steel tubes for pressure purposes – Technical delivery conditions – Part 7: Stainless steel tubes.
8.4 Corrosion resistance
The information given in Tables 6 and 7 refers to the resistance of the steels to intergranular corrosion when tested according to EN ISO 3651-2 to the indicated method A or B or C. Guideline values for the limit temperature for susceptibility to intergranular corrosion are indicated in Tables 8 and 9.
Option 13: A test for the resistance to ntergranuIar corrosion shall be carried out.
If other specific corrosion tests are required, they shall be agreed at the time of enquiry and order.
8.5 Appearance and internal soundness
8.5.1 Appearance
8.5.1.1 The tubes shall be free from external and internal surface defects that can be established by visual inspection.
8.5.1.2 The internal and external surface finish of the tubes shall be typical of the manufacturing process and. where applicable, the heat treatment employed. Normally the finish and surface condition shall be such that any surface imperfections requiring dressing can be identified.
8.5.1.3 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 thickness. All dressed areas shall blend smoothly into the contour of the tube.
8.5.1.4 Surface imperfections which encroach on the specified minimum wall thickness shall be considered defects and tubes containing these shall be deemed not to conform to this Part of EN 10217.
8.5.1.5 Repairs to the weld are permitted. Any repairs shall be carried out by qualified welders according to a qualified welding procedure specification and all repaired areas shall be non-destructively tested according to 11.11. For tubes welded with or without filler metal, weld repair may be made with the addition of compatible filler metal.
Option 14: Repair welding is only permitted with the agreement of the purchaser The content of the repair including the relevant documentation (see 7.2.2) shall be agreed.
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 15 is specified, the choice of the test method is at the discretion of the manufacturer.
Option 15: 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 16: The tubes of test category 2 shall be submitted to a non-destructive testing for the detection of laminar imperfections at the tube ends according to 11.11.2.
Option 17: The edges of strip or plate used for the manufacture of tubes of test category 2 shall be submitted to a non-destructive testing for the detection of laminar imperfections according to 11.11.3.
All NOT activities shall be camed out by qualified and competent level 1,2 and/or 3 personnel authorised to operate by the employer.
The qualification shall be according to ISO 11484 or, at least, an equivalent to ii
It is recommended that the level 3 personnel be certified according to EN ISO 9712 or, at least, an equivalent to it.
The operating authorisation issued by the employer shall be according to a written procedure.
All NDT operations shall be authorised by a level 3 NOT individual approved by the employer.
NOTE The definition of level 1,2 and 3 can be found in appropnate standards, e.g. EN ISO 9712 and ISO 11484.
When tubes are being used for pressure equipment in categories Ill and IV, of the Directive 97l23/EC, the personnel shall, according to section 3.1.3 of Annex Ito the Directive, be approved by a third-party organization recognized by a Member State in accordance with Article 13 of the Directive.
8.6 Straightness
The deviation from straightness of any tube length L shall not exceed 0,0015 L. Deviations from straightness over any one meter length shall not exceed 3 mm.EN 10217-7-2014 pdf download.
EN 10217-7-2014 pdf download
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