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1、BRITISH STANDARD BS 778:1966 Incorporating Amendment Nos. 1, 2 and 3 Specification for Steel pipes and joints for hydraulic purposes UDC 621.643.2 + 621.643.4:669.14 462 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:26:13 GMT+00:00 2006, Uncontrolled Copy,
2、(c) BSI BS 778:1966 This British Standard, having been approved by the Mechanical Engineering Industry Standards Committee and endorsed by the Chairman of the Engineering Divisional Council, was published under the authority of the General Council on 21 January 1966 BSI 01-2000 First published 1938
3、First revision 1951 Second revision 1966 The following BSI references relate to the work on this standard: Committee references MEE/11, MEE/11/3 Draft for comment D64/8110 ISBN 0 580 01301 4 Co-operating organizations The Mechanical Engineering Industry Standards Committee, under whose supervision t
4、his 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 di
5、rectly represented on the committee entrusted with the preparation of this standard: Associated Offices Technical Committee*Institution of Gas Engineers* Association of Consulting Engineers*Institution of Heating and Association of Mining Electrical andVentilating Engineers Mechanical EngineersInsti
6、tution of Mechanical Engineers* Board of Trade*Institution of Mechanical Engineers British Chemical Plant Manufacturers(Automobile Division) AssociationInstitution of Production Engineers British Compressed Air SocietyLocomotive and Allied Manufacturers British Electrical and Allied ManufacturersAss
7、ociation of Great Britain Association*London Transport Board British Gear Manufacturers AssociationMachine Tool Trades Association British Internal Combustion EngineMinistry of Defence, Army Department Manufacturers AssociationMinistry of Defence, Navy Department* British Iron and Steel Federation*M
8、inistry of Labour (H.M. Factory Inspectorate) British Mechanical Engineering FederationMinistry of Power British Railways BoardMinistry of Public Building and Works Crown Agents for Oversea Governments andMinistry of Technology AdministrationsNational Engineering Laboratory Electricity Council, The
9、Generating Board andMinistry of Transport the Area Boards in England and Wales* National Coal Board Engineering Equipment Users Association*National Physical Laboratory Gas Council(Ministry of Technology) Institute of Marine EngineersRadio Industry Council Institution of Civil Engineers*Royal Instit
10、ute of British Architects Association of Hydraulic Equipment Lloyds Register of Shipping ManufacturersNational Association of Drop Forgers and British Bolt, Nut, Screw and Rivet Federation Stampers British Plastics FederationNorth East Coast Institution of Engineers and British Valve Manufacturers A
11、ssociationShipbuilders Hydraulic AssociationWater-tube Boilermakers Association Institute of WeldingManufacturers of pipes and flanges Amendments issued since publication Amd. No.Date of issueComments 5808March 1966 6205July 1967 1850October 1975Indicated by a sideline in the margin Licensed Copy: L
12、ondon South Bank University, London South Bank University, Fri Dec 08 11:26:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 778:1966 BSI 01-2000i Contents Page Co-operating organizationsInside front cover Forewordii Part 1. Screwed flange joints and pipes 1.1Scope1 1.2Information to be supplied by
13、the purchaser1 1.3Materials and process of manufacture1 1.4Dimensions, tolerances and workmanship1 1.5Screwing of pipes and flanges2 1.6Method of attaching flanges3 1.7Marking3 Part 2. Pipes for use with welding neck flanges 2.1Scope10 2.2Information to be supplied by the purchaser10 2.3Materials an
14、d process of manufacture10 2.4Dimensions and tolerances10 2.5Jointing10 2.6Bolting10 2.7Welding10 2.8Marking10 Part 3. Pipes for use with compression type joints 3.1Scope11 3.2Information to be supplied by the purchaser11 3.3Materials and process of manufacture11 3.4Dimensions and tolerances11 3.5Ma
15、rking11 Appendix A Design requirements13 Appendix B Metric dimensions14 Figure 14 Figure 24 Figure 34 Figure 46 Figure 56 Figure 66 Figure 76 Figure 87 Figure 97 Table 1 Dimensions of pipes2 Table 2 Rectangular two-bolted hydraulic pipe flanges for design pressure of 1 500 lbf/in24 Table 3 Rectangul
16、ar two-bolted hydraulic pipe flanges for design pressure of 2 500 lbf/in25 Table 4 Rectangular two-bolted hydraulic pipe flanges for design pressure of 5 000 lbf/in25 Table 5 Square and circular 4 and 6 bolted hydraulic pipe flanges for design pressure of 1 500 lbf/in26 Table 6 Square and circular 4
17、 and 6 bolted hydraulic pipe flanges for design pressure of 2 500 lbf/in28 Table 7 Square and circular 4 and 6 bolted hydraulic pipe flanges for design pressure of 5 000 lbf/in29 Table 8 Dimensions of pipes11 Table 9 Dimensions of pipes12 Licensed Copy: London South Bank University, London South Ban
18、k University, Fri Dec 08 11:26:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 778:1966 ii BSI 01-2000 Foreword This standard makes reference to the following British Standards: BS 10, Flanges and bolting for pipes, valves and fittings. BS 899, Rolled copper sheet, strip and foil. BS 916, Black bol
19、ts, screws and nuts. BS 1083, Precision hexagon bolts, screws and nuts. BS 1501-6, Steels for use in the chemical, petroleum and allied industries. BS 1768, Unified precision hexagon bolts, screws and nuts (UNC and UNF threads). Normal series. BS 1769, Unified black hexagon bolts, screws and nuts (U
20、NC and UNF threads). Heavy series. BS 2051, Tube and pipe fittings for engineering purposes Part 3: Steel compression pipe fittings. BS 2633, Class I metal-arc welding of steel pipelines and pipe assemblies for carrying fluids. BS 2708, Unified black square and hexagon bolts, screws and nuts (UNC an
21、d UNF threads). Normal series. BS 2779, Fastening threads of BSP sizes (formerly in BS 84:1940). BS 3601, Steel pipes and tubes for pressure purposes. Carbon steel: ordinary duties. This British Standard has been prepared under the authority of the Mechanical Engineering Industry Standards Committee
22、. The first edition of this standard was published in 1938 and dealt with screwed flange joints for pipelines for pressures up to 4 500 lbf/in2, but included only recommended minimum thickness for pipes for such pipelines. In the 1951 edition complete specifications for flanges and pipes for working
23、 pressures up to 4 500 lbf/in2 were given, the flanges being suitable for pipelines and for valves on hydraulic machines. In this revision account has been taken of the publication of BS 3601, “Steel pipes and tubes for pressure purposes: carbon steel: ordinary duties”, and the pipes specified in th
24、at standard are called for in this revision. At the same time the basis of establishing the design thickness of pipes has been included in the Appendix. The dimensions of the screwed flanges have been checked on the same basis as was used for the dimensions of flanges to BS 10 and this check showed
25、that the flanges were adequate for the design pressures given. In preparing this revision the committee reviewed the practices in current use in the hydraulic industry. Arising from this review, it became apparent that the type of joint employing freely fitting screwed flanges which draw pipe ends t
26、ogether to grip a ductile joint ring was not used for such a wide range of sizes as formerly and that there was a need for standards covering the use of compression type joints in the smaller sizes and welding neck flanges in the larger sizes and for higher pressures. Part 1 of this revision now cov
27、ers a range of pipe sizes 17/32 in o.d. to 51/2 in o.d. with screwed flanges. Part 2 gives a range of pipes and materials for use with welding neck flanges in sizes 4 in o.d. to 123/4 in o.d. Part 3 gives a range of pipes and materials for use with the type of compression joint specified in BS 2051,
28、 “Tube and pipe fittings for engineering purposes”, Part 3, “Steel compression pipe fittings” in sizes 0.250 in to 2.000 in o.d., and for design pressures not exceeding 6 000 lbf/in2. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:26:13 GMT+00:00 2006, Uncon
29、trolled Copy, (c) BSI BS 778:1966 BSI 01-2000iii NOTE 1In place of the customary, but incorrect, use of the pound as a unit of force, the unit called a pound force (abbreviation lbf) has been used in this standard. It is the force which, when acting on a body of mass one pound, gives it an accelerat
30、ion equal to that of standard gravity. The unit of ton force (tonf) is similarly used. NOTE 2When metric equivalents of the pipe dimensions in this standard are required, reference should be made to the corresponding values in the following ISO Recommendations: ISO R 64, “Steel tubes, outside diamet
31、ers”. ISO R 221, “Steel tubes, thicknesses”. NOTE 3When it is required to convert other figures in this standard from British units into metric units it is recommended that the conversion factors and tables of conversion contained in BS 350, “Conversion factors and tables” be used. Attention is also
32、 drawn to BS 2856, “Precise conversion of inch and metric sizes on engineering drawings”. 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 o
33、f 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 14 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the a
34、mendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:26:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:26:13 GMT+00:00 2006,
35、Uncontrolled Copy, (c) BSI BS 778:1966 BSI 01-20001 Part 1. Screwed flange joints and pipes 1.1 Scope 1.1.1 This part covers steel pipes and flange joints for hydraulic purposes employing working fluids such as water and oil in sizes from 17/32 in to 51/2 in outside diameter, suitable for the follow
36、ing design pressures: 1) up to and including 1 500 lbf/in2 2) above 1 500 lbf/in2 up to and including 2 500 lbf/in2 3) above 2 500 lbf/in2 up to and including 5 000 lbf/in2. The joint comprises freely fitting flanges screwed on to the pipe with a joint ring between the ends of the pipes themselves.
37、1.2 Information to be supplied by the purchaser 1.2.1 The purchaser shall include the following items in his enquiry or order: 1) Design pressure (see 1.1). 2) Type of pipe and grade of steel required by the designation given in BS 36011). 3) Outside diameter and thickness (see Table 1) and length o
38、f pipes required. 4) Whether pipes are to have plain ends, screwed ends without flanges, or screwed ends with flanges screwed on. 5) Types of flanges required (see Table 2 to Table 7). 6) Whether bolts are to be supplied and the type required. 7) Whether joint rings are required. 8) If it is desired
39、 to witness mechanical or other tests or if test certificates are required. 9) Details of any additional marking required. 10) Details of any protection required. 1.3 Materials and process of manufacture 1.3.1 Pipes. The pipes shall comply with the requirements of BS 36011) except for the hydraulic
40、test pressure and shall be of the following types and grades: The hydraulic test pressure shall be 11/2 times the design pressure given in 1.1. 1.3.2 Flanges. The flanges shall be made from steel complying with any of the grades given in BS 1501-151 for plates, BS 1502-151 for bars and BS 1503-161 f
41、or forgings2). The flanges shall be sawn or flame cut from bars or plates, or shall be forged. 1.3.3 Joint rings. Unless otherwise specified by the purchaser, the joint rings shall be made of copper to BS 8993). Soft materials which are likely to be extruded shall not be used. 1.3.4 Bolts and nuts.
42、The bolts and nuts shall be in accordance with BS 9164) or BS 10834) or where bolts with unified threads are required, in accordance with BS 17684), BS 17694) or BS 27084). The bolts shall be made from steel having a minimum tensile strength of 28 tonf/in2. 1.4 Dimensions, tolerances and workmanship
43、 1.4.1 Pipes 1.4.1.1 Dimensions. The dimensions of the pipes shall be in accordance with Table 1. The outside diameters that have been standardized are those appropriate to the screw threads, which are utilized in joining the pipes. The thicknesses tabulated are those appropriate to the design condi
44、tions specified (see Appendix A). 1) BS 3601, “Steel pipes and tubes for pressure purposes. Carbon steel: ordinary duties”. Type of pipeGrade of steel Hot finished seamless (HFS)22 and 27 Cold drawn seamless (CDS)22 and 27 Electric resistance welded (ERW)22 and 27 2) BS 1501, “Steels for fired and u
45、nfired pressure vessels. Plates”. BS 1502, “Steels for fired and unfired pressure vessels. Sections and bars”. (In course of preparation.) BS 1503, “Steels for fired and unfired pressure vessels. Forgings”. 3) BS 899, “Rolled copper sheet, strip and foil”. 4) BS 916, “Black bolts, screws and nuts”.
46、BS 1083, “Precision hexagon bolts, screws and nuts”. BS 1768, “Unified precision hexagon bolts, screws and nuts (UNC and UNF threads). Normal series”. BS 1769, “Unified black hexagon bolts, screws and nuts (UNC and UNF threads). Heavy series”. BS 2708, “Unified black square and hexagon bolts, screws
47、 and nuts (UNC and UNF threads). Normal series”. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:26:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 778:1966 2 BSI 01-2000 Table 1 Dimensions of pipes 1.4.1.2 Tolerances. The pipes are subject to the manufactur
48、ing tolerances specified in BS 36015), but closer outside diameter tolerances are required at the ends for screwing. Pipes shall have the ends sized where necessary, before screwing, in accordance with 1.5. 1.4.2 Flanges 1.4.2.1 Dimensions. The dimensions of the flanges shall be in accordance with T
49、able 2 to Table 7 inclusive. 1.4.2.2 Tolerances. The thickness and exterior dimensions given in Table 2 to Table 7 are minima. 1.4.2.3 Workmanship. The flanges shall be clean and free from burrs. Forged flanges or flanges made from bar or plate need not be machined provided the back is made sufficiently flat to enable the bolt heads and nuts to hold squarely otherwise the back of the flanges shall be machined or spot-faced. The bolt holes shall be drilled and for 5/8 in bolts shall be 1/16 in larger in diameter than the bolts and for 3/4 in bol