6758 International Standard (ISO INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEKAYHAPOAHAR OPTAHW3AUWH NO CTAHAAPTW3AUMVORGANISATION INTERNATIONALE DE NORMALISATION Welded steel tubes for heat exchangers Tubessoudésenacierpouréchangeursdechaleur First edition- 1980-09-15 ISO 6758-1980 (E) UDC 621.643.23 : 669.14.018.8 : 621-71 Ref.No.ISO 6758-1980 (E) Descriptors : heat exchangers, steel tubes, smooth tubes, welded tubes, alloy steels, unalloyed steels, dimensions, mass, dimensional tolerances. Price based on 3 pages r Standardizat Noreproductionor networking permited without licensefromIHS Not for Resale Foreword ISo (the International Organization for Standardization) is a worldwide federation of national standards institutes (iso member bodies). The work of developing Inter- national Standards is carried out through ISo technical committees. Every member body interested in a subject for which a technical committee has been set up has the right to be represented on that committee. international organizations, governmental and non-governmental, in liaison with Iso, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by theIso Council. International Standard iSO 6758 was developed by Technical Committee iSO/TC 5, Metal pipes and fittings, and was circulated to the member bodies in July 1979. It has been approved by the member bodies of the following countries : Australia India Romania Austria Israel South Africa, Rep. of Belgium Italy Spain Canada Korea,Rep.of Sweden Chile Mexico Switzerland Czechoslovakia Netherlands United Kingdom Denmark NewZealand USSR Finland Norway France Poland Thememberbodies ofthefollowingcountriesexpresseddisapproval ofthedocument on technical grounds : Japan USA C International Organization for Standardization, 1980 Printed in Switzerland Copyright International Organization for Standardization Not for Resale INTERNATIONALSTANDARD ISO 6758-1980 (E) Welded steel tubes for heat exchangers 1 Scope and field of application Austenitic stainless : TW46, TW47, TW53, .TW57, TW58, TW60,TW61 1.1 This International Standard specifies the characteristics of plain end welded tubes manufactured from unalloyed and Other grades of steel from ISo 2604, Parts 3 and 5, may be alloyed steels (including austenitic stainless steels) which are suppliedbyagreementbetweenthemanufacturerand thepur- intended for use in the construction of heat exchangers. chaser. 1.2 This International Standard does not cover steel tubes Dimensions, masses and tolerances intended for exposure to flame. 4.1 Dimensions and masses 2 References Table 1 -- Unalloyed and alloyed steels iSO2604/3,Steelproductsforpressurepurposes- Quality Outside Thicknesses,mm requirements-Part3:Electric resistance and induction- diameters 1,2 1,6 2,0 2,6 3,2 Welded tubes. mm Masses per unit length, kg/m iso2604/5,Steelproducts forpressurepurposes-- Quality 16 0,438 0,568 0,691 requirements Part 5: Longitudinally welded austenitic 20 0,726 0,888 1,12 stainless steel tubes. 25 0,923 1,13 1,44 1,72 30 1,12 88'1 1,76 2,11 38 1,78 2,27 2,75 3Material NOTE- See also the annex. Tubes shall be to the requirements of ISo 2604/3 or Table2- Austenitic stainless steels ISo 2604/5. They shall be to test category Ill or V for ISo 2604/3 and to test category Il or IV for ISo 2604/5, except Outside Thicknesses,mm that the hydraulic test may, at the option of the manufacturer, diameters 1,2 1,6 2,0 2,6 3,2 be replaced by a non-destructive test which ensures equivalent mm Masses per unit length, kg/m leak tightness. 16 0,445 0,577 0,701 The steels shall preferably be selected from the following : 20 0,564 0,737 0,901 1,14 25 0,937 1,15 1,46 1,75 Unalloyed : TW2, TW5, TW9H, TW10 30 一 1,14 1,40 1,79 2,14 38 1,46 1,81 2,30 2,79 Alloyed : TW26, TW32 NOTE - See also the annex. Copyright Inte national Organizatio for Standardizatior No reprodu