BS-2871-2-1972.pdf

BRITISH STANDARD BS 2871-2: 1972 Incorporating Amendment issued November 1976 (AMD 2154). Specification For Copper and Copper Alloys Tubes Part 2: Tubes for general purposes UDC 669.3-462:621.643.24 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:48:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2871-2:1972 This British Standard, having been approved by the Non-ferrous Metals Industry Standards Committee, was published under the authority of the Executive Board on 29 February 1972 © BSI 02-1999 First published (as BS 2871) July, 1957. First revision February, 1972. The following BSI references relate to the work on this standard: Committee reference NFE/17 Draft for comment 70/25753 ISBN 580 06758 0 Co-operating organizations The Non-ferrous Metals Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments, and scientific and industrial organizations: The Government departments and scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: Aluminium FederationInstitution of Mining and Metallurgy Association of Bronze and Brass FoundersInstitution of Production Engineers British Bronze and Brass Ingot Institution of Structural Engineers Manufacturers AssociationLead Development Association British Electrical and Allied Manufacturers Light Metal Founders Association Association*London Metal Exchange British Lead Manufacturers AssociationMagnesium Industry Council British Non-ferrous Metals Federation*Ministry of Defence (Army Department)* British Non-ferrous Metals Federation HighMinistry of Defence (Navy Department)* Conductivity Copper GroupNational Brassfoundry Association British Non-ferrous Metals Research Non-ferrous Metal Stockists* Association*Post Office Copper Development Association*Royal Institute of British Architects Department of Trade and Industry (Marine Society of Motor Manufacturers and Traders Division)Limited Electric Cable Makers ConfederationTin Research Institute Institute of British FoundrymenZinc Development Association Institute of MetalsIndividual manufacturers Institution of Mechanical Engineers (Automobile Division)* British Waterworks AssociationInstitution of Gas Engineers Copper Tube Fittings Manufacturers Institution of Heating and Ventilating AssociationEngineers Department of the EnvironmentInstitution of Mechanical Engineers Department of Trade and IndustryMetropolitan Water Board Electricity Council, The Central ElectricityNational Federation of Plumbers and Generating Board and the Area Boards forDomestic Heating Engineers England and WalesNational Physical Laboratory (Department of Engineering Industries AssociationTrade and Industry) Gas CouncilOil Companies Materials Association Institute of Plumbing Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:48:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2871-2:1972 © BSI 02-1999i Contents Page Co-operating organizationsInside front cover Forewordii 1Scope1 2General1 3Information to be supplied by the purchaser1 4Freedom from defects1 5Chemical composition1 6Manufacture1 7Condition1 8Dimensions and tolerances2 9Selection of test samples2 10Mechanical tests2 11Non-destructive tests3 12Mercurous nitrate test3 13Retests3 14Certificate of compliance3 15Inspection3 16Independent test3 17Facilities for testing4 18The rounding of numbers rule4 19Copper tubes for use in refrigeration plant4 Figure 1 Flattening test6 Figure 2 Double-bend test7 Figure 3 Drifting test7 Table 1 Tolerances on length2 Table 2 Chemical composition and mechanical properties of copper and copper alloys tubes4 Table 3 Preferred sizes of tubes for pipelines for shipbuilding and other engineering purposes7 Table 4 Preferred sizes of tubes for purposes other than pipelines8 Table 5 Copper tubes for steam services with plain ends (low pressure range)8 Table 6 Copper tubes for steam services with plain ends (high pressure range)8 Table 7 Copper tubes for steam services with screwed ends (low pressure range)8 Table 8 Copper tubes for steam services with screwed ends (high pressure range)9 Table 9 Copper tubes for general purposes for pressures up to and including 12 bar (175 lb/in2)9 Table 10 Copper tubes for general purposes for pressures over 12 bar (175 lb/in2) up to and including 20 bar (300 lb/in2)9 Table 11 Tolerances on diameter for tubes other than preferred sizes9 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:48:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2871-2:1972 ii © BSI 02-1999 Foreword A complete list of British Standards, numbering over 9,000, fully indexed and with a note of the contents of each, will be found in the BSI Catalogue which may be purchased from BSI Sales Department. The Catalogue may be consulted in many public libraries and similar institutions. This standard makes reference to the following British Standards: BS 18, Methods for tensile testing of metals. Part 1: Non-ferrous metals. BS 427, Method for Vickers hardness test. BS 1957, Presentation of numerical values (fineness of expression; rounding of numbers). BS 3889, Methods for non-destructive testing of pipes and tubes. Part 2B: Eddy current testing of non-ferrous tubes. This British Standard is the first revision in metric terms of one of a series for copper and copper alloys in various wrought forms, the preparation of which was authorized by the Non-ferrous Metals Industry Standards Committee. Others in the series are: BS 2870, Rolled copper and copper alloys. Sheet, strip and foil. BS 2872, Copper and copper alloys. Forging stock and forgings. BS 2873, Copper and copper alloys. Wire. BS 2874, Copper and copper alloys. Rods and sections. BS 2875, Copper and copper alloys. Plate. In preparing this metric revision of BS 2871 it was decided to produce it in three parts thereby eliminating the large section of particular applications which forms Part 3 of the 1957 edition. This Part specifies requirements for tubes for general purposes expressed in metric units based on those previously expressed in imperial units in the following standards, which have now been withdrawn: BS 61, Copper tubes (heavy gauge) for general purposes. Part 1: Copper tubes (heavy gauge). BS 885, Brass tubes for general purposes. 70/30 arsenical brass, aluminium brass. BS 1306, Non-ferrous pipes and tubes for steam services. Part 2: Seamless copper tubes for steam services. BS 2017, Copper tubes for general purposes. In addition the opportunity has been taken to include a table of pipeline sizes of tubes used specifically in the shipbuilding industry but also suitable for many other purposes. This table of sizes is in accordance with the sizes agreed by ISO and will be included in the revision of ISO Recommendation R 274. They will also meet the requirements of surveying authorities. The outside diameter of these tubes accord with some steel tube diameters and ensure correct mating of flanges, etc. In addition they are similar to those supplied to many European countries for shipbuilding purposes for many years. Further rationalization of sizes has been effected in the various tables of copper tubes suitable for screwing, and for steam services, e.g. similar to previously existing BS 61-1 and BS 1306-2. The outside diameters of tubes suitable for screwing are a direct conversion of the existing dimensions but the thicknesses have been re-calculated using the design stress values currently accepted and specified which has in many instances enabled reductions to be effected. As a result, the six tables previously given in BS 1306-2 have been reduced to four by eliminating the medium pressure table and extending the higher pressure table to cover these requirements. The two tables of screwed tubes are the same as the previously existing BS 61 tables and one table of plain tubes is the same as Table Y of Part 1:1971 of this standard. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:48:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2871-2:1972 © BSI 02-1999iii The tolerances on the outside diameters specified in Part 1 and also the pipeline sizes specified in Table 2 of Part 2 are tighter than those covered in the revision of R 274; in all these cases the maximum diameters are in agreement in order to avoid difficulties in assembling flanges, fittings etc., due to interference fit. This course of action has been taken because the tighter tolerances have been adhered to in this country for many years without undue difficulty and it is universally accepted that where joints using the capillary principle are produced using soft solder or silver brazing as appropriate to the service conditions then more satisfactory joints result. Consequently whilst the maximum outside diameters are in accordance with the ISO draft recommendation and the minimum outside diameters are in some cases above the ISO sizes, they do completely meet the ISO requirements. NOTEAttention is drawn to certification facilities offered by BSI; see the back cover of this standard. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 9 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:48:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:48:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2871-2:1972 © BSI 02-19991 1 Scope This Part of this British Standard specifies requirements for copper and copper alloy tubes for general purposes from 2 mm up to and including 508 mm outside diameter and from 0.4 mm up to and including 8.0 mm thickness. A list of preferred sizes is given in the following tables: These requirements apply to round tubes except where reference is made to square or rectangular tubes. NOTEThe titles of the British Standards referred to in this standard are listed on page ii. 2 General The tubes shall comply with the general requirements set out in the following clauses, and with the appropriate requirements of Table 1 to Table 11. 3 Information to be supplied by the purchaser The purchaser shall state on his enquiry and order the following information: 1) The designation of the material required (see Table 2). 2) The condition of the material (see Table 2 and Table 7). 3) Whether mechanical and/or non-destructive tests are required (see 10 and 11). 4) Whether a certificate of compliance is required (see 14). 5) Whether it is the purchasers intention to inspect the material at the suppliers works (see 15). 6) Whether the tubes are required in refrigeration quality (see 19). 4 Freedom from defects The tubes shall be clean, smooth and free from harmful defects. 5 Chemical composition The chemical composition of the tubes shall comply with the requirements of Table 2. 6 Manufacture The tubes shall be solid drawn, and in no case shall they be redrawn from used tubes. Unless otherwise ordered they shall be supplied in straight lengths and the ends shall be cut clean and square with the axis of the tubes. 7 Condition The tubes shall be supplied in one of the following conditions as specified in Table 2: M condition. Tubes in the “as drawn” condition. An “as drawn” tube is defined as one supplied in the condition of the tube on the completion of the necessary operations to produce the specified diameter and wall thickness. These operations are not necessarily directed toward producing any particular temper, and the temper of “as drawn” tubes may vary with the diameter and thickness. Such tubes may be subjected to stress relieving treatment after the final draw at the option of the supplier. “As drawn” tubes would normally be unsuitable for bending or expanding, without local annealing. Although the tensile strength figures quoted may be regarded as normal minima, they may not always be capable of attainment in exceptional size, whereas for many diameters and thicknesses, figures in excess of those quoted may be regularly obtainable. When there is doubt that these properties will be obtainable the supplier should inform the purchaser. TA condition. Tubes in the temper annealed condition. These tubes will have been heat treated over their full length to an intermediate temper. O condition. Tubes in the annealed condition. “H condition. Tubes in the half hard temper produced by cold drawing. Table 3. Preferred sizes of tubes for pipelines for shipbuilding and other engineering purposes. Table 4. Preferred sizes of tubes for purposes other than pipelines. Table 5. Copper tubes for steam services with plain ends (low pressure range). Table 6. Copper tubes for steam services with plain ends (high pressure range). Table 7. Copper tubes for steam services with screwed ends (low pressure range). Table 8. Copper tubes for steam services for screwed ends (high pressure range). Table 9. Copper tubes for general purposes for pressures up to and including 12 bara(175 lb/in2.) Table 10.Copper tubes for general purposes for pressures over 12 bar (175 lb/in2) and up to and including 20 bar (300 lb/in2.) a 1 bar = 0.1 N/mm2 = 105 N/m2. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:48:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2871-2:1972 2 © BSI 02-1999 If ordered in coil the tubes shall be annealed. Copper tubes in straight lengths, unless otherwise specified, will be supplied in the M condition. 8 Dimensions and tolerances 8.1 Round tubes 8.1.1 Diameter. The mean outside diameter of the tube shall not vary from the specified outside diameter by more than the amount of the tolerances specified in Table 3 to Table 11 inclusive. The mean outside diameter is half the sum of the two diameters at right angles on one cross section of the tube. 8.1.2 Thickness. The thickness of the tube at any point shall not vary from that specified by more than ± 10 % for diameters up to and including 108 mm and by not more than ± 12.5 % for diameters greater than 108 mm. 8.1.3 Length. The length of the tube shall not vary from that specified by more than the amount of the tolerances given in Table 1 when measured at a temperature of 15 °C. 8.2 Square or rectangular tubes. The tolerances on square and rectangular tubes shall be agreed between the purchaser and the supplier. 9 Selection of test samples 9.1 Mechanic