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8.4.1 Appearance8.4.1.1 The tubes shall be free from external and internal surface defects that can be detected by visualexamination.8.4.1.2 The internal and external surface finish of the tubes shall be typical of the manufacturing processand, where applicable, the heat treatment employed. Normally the finish and surface condition shall be suchthat any surface imperfections requiring dressing can be identified.8.4.1.3 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 wall thickness. Alldressed areas shall blend smoothly into the contour of the tube.8.4.1.4 Any surface imperfection, which is demonstrated to be deeper than 5 % of the wall thickness T or3 mm, whichever is the smaller, shall be dressed.This requirement does not apply to surface imperfection with a depth equal or less 0,3 mm8.4.1.5 Surface imperfections which encroach on the specified minimum wall thickness shall be considereddefects and tubes containing these shall be deemed not to conform to this Part of EN 10216.8.4.2 Internal soundness8.4.2.1 Leak TightnessThe tubes shall pass a hydrostatic test (see 11.8.1) or electromagnetic test (see 11.8.2) for leak-tightness.Unless option 7 is specified, the choice of the test method is at the discretion of the manufacturer.Option 7: The test method for verification of leak-tightness in accordance with 11.8.1 or 11.8.2 is specified bythe purchaser.8.4.2.2 Non-Destructive TestingThe tubes of test category 2 shall be subjected to a non-destructive testing for the detection of longitudinalimperfections, in accordance with11.11.1.Option 8: The tubes of test category 2 shall subjected to a non-destructive testing for the detection oftransverse imperfections in accordance with11.11.2.Option 9: The tubes of test category 2 shall be subjected to a non-destructive testing for the detection of thelaminar imperfections in accordance with11.11.3.8.5 StraightnessThe deviation from straightness of any tube length L shall not exceed 0,001 5 L. Deviations from straightnessover any one metre length shall not exceed 3 mm.
8.7 Dimensions, masses and tolerances8.7.1 Diameter and wall thicknessUnless option 11 is specified, tubes shall be delivered by outside diameter D and wall thickness T.Preferred outside diameters D and wall thicknesses T have been selected from EN 10220 and are given inTable 6.Dimensions which are different from those in Table 6 may be agreed.Option 11: The tubes shall be delivered in accordance with one of the following sets of dimensions as specifiedat the time of enquiry and order: outside diameter D and minimum wall thickness Tmin; inside diameter d and wall thickness T for d ≥ 220 mm; inside diameter d and minimum wall thickness Tmin for d ≥ 220 mm; minimum inside diameter dmin and wall thickness T for dmin ≥ 220 mm; minimum inside diameter dmin and minimum wall thickness Tmin for dmin ≥220 mm.
