OSI International Standard 6759 Seamless steel tubes for heat exchangers Tubes sans soudureenacierpouréchangeurs dechaleur First edition - 1980-09-01 UDC 621.643.23 : 669.14.018.8 : 621-71 ISO 6759-1980 (E) Ref.No.1SO 6759-1980 (E) Descriptors : heat exchangers, steel tubes, smooth tubes, seamless tubes, dimensions, mass, dimensional tolerances. Price based on 3 pages 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 memberbodies for approval before theiracceptance as International Standards by theiSo Council. international Standard ISO 6759 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 France Romania Austria India South Africa, Rep. of Belgium Israel Spain Canada Italy Sweden Chile Korea, Rep. of Switzerland Czechoslovakia Mexico United Kingdom Denmark Netherlands USSR Finland Norway The member bodies of the following countries expressed disapproval of the document ontechnical grounds : Japan USA @ International Organization for Standardization, 1980 Printed in Switzerland Copyright Intern national Organizat No reproduction or networking permitted without license from IHS Not for Resale ISO6759-1980 (E) INTERNATIONAL STANDARD Seamless steel tubes for heat exchangers Scope and field of application 4 Dimensions, masses and tolerances 1.1 This International Standard specifies the characteristics 4.1 Dimensionsandmasses of plainendseamlesstubes manufacturedfromunalloyedand alloyed steels (including stainless steels)whichare intended for Table 1 -- Unalloyed and alloyed steels use in the construction of heat exchangers. Thicknesses, mm Outside 1.2This International Standard does not cover steel tubes in- diameters 1,2 1,6 2,0 2,6 3,2 mm tended for exposure to flame. Masses per unit length, kg/m 16 0,438 0,568 0,691 20 0,726 0,888 1,12 25 0,923 1,13 1,44 1,72 Reference 30 1;12 1,38 1,76 2,11 38 1,78 2,27 2,75 Iso2604/2,Steel products for pressure purposes Quality NOTE - See also the annex. requirements-Part2:Wroughtseamlesstubes. Table 2 Austenitic stainlesssteels Thicknesses, mm Outside 3Material diameters 1,2 1,6 2,0 2,6 3,2 mm Masses per unit length, kg/m Tubes shall be to the requirements of iS0 2604/2 and shall be 16 0,445 0,577 0,701 cold finished and heat treated. They shall be to test category Il! 0,564 0,737 0,901 1,14 orV,except that thehydraulic test may,at the option of the 25 0,937 1,15 1,46 1,75 manufacturer, be replaced by a non-destructive test which en- 30 1,14 1,40 1,79 2,14 8 sures equivalent leak-tightness. 1,46 1,81 2,30 2,79 NOTE - See also the annex. The steels shall preferably be selected from the following : Table3 Ferritic stainless steels Unalloyed : TS2, TS5, TS9H, TS10 Thicknesses, mm Outside Alloyed:TS26,TS32,TS34,TS37,TS43,TS45 diameters 1,2 1,6 2,0 2,6 3,2 mm Masses per unit length, kg/m Ferritic stainless : TS39 16 0,431 0,559 0,681 Austenitic stainless : TS46, TS47, TS48, TS53, TS54, TS57, 20 0,548 0,715 0,875 1,10 TS58, TS60, TS61, TS63 25 0,909 1,11 1,42 1,69 30 一 1,10 1,36 1,73 2,08 Other grades of steel from ISo 2604, part 2, may be supplied 38 1,42 1,75 2,24 2,71 by agreement between the manufacturer and purchaser. NOTE E - See also the annex. 1 Copyright International Organization for Standardization NoreproductionnetworkingpermitedwithoutlicensefromHS Not for Resale