BS 778-1966 Specification for steel pipes and joints for hydraulic purposes《液压用钢管与接头规范》.pdf

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 462BS778:1966 This British Standard, having been approved by the MechanicalEngineering IndustryStandards Committee and endorsed by the

2、 Chairman ofthe Engineering Divisional Council, was publishedunder theauthority ofthe GeneralCouncil on 21 January 1966 BSI 01-2000 First published 1938 First revision 1951 Second revision 1966 The following BSI references relate to the work on this standard: Committee references MEE/11, MEE/11/3 Dr

3、aft for comment D64/8110 ISBN 0580 01301 4 Co-operating organizations The Mechanical Engineering Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations

4、: 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 standard: Associated Offices Technical Committee* Institution of Gas Engi

5、neers* Association of Consulting Engineers* Institution of Heating and Association of Mining Electrical and Ventilating Engineers Mechanical Engineers Institution of Mechanical Engineers* Board of Trade* Institution of Mechanical Engineers British Chemical Plant Manufacturers (Automobile Division) A

6、ssociation Institution of Production Engineers British Compressed Air Society Locomotive and Allied Manufacturers British Electrical and Allied Manufacturers Association of Great Britain Association* London Transport Board British Gear Manufacturers Association Machine Tool Trades Association Britis

7、h Internal Combustion Engine Ministry of Defence, Army Department Manufacturers Association Ministry of Defence, Navy Department* British Iron and Steel Federation* Ministry of Labour (H.M. Factory Inspectorate) British Mechanical Engineering Federation Ministry of Power British Railways Board Minis

8、try of Public Building and Works Crown Agents for Oversea Governments and Ministry of Technology Administrations National Engineering Laboratory Electricity Council, The Generating Board and Ministry of Transport the Area Boards in England and Wales* National Coal Board Engineering Equipment Users A

9、ssociation* National Physical Laboratory Gas Council (Ministry of Technology) Institute of Marine Engineers Radio Industry Council Institution of Civil Engineers* Royal Institute of British Architects Association of Hydraulic Equipment Lloyds Register of Shipping Manufacturers National Association o

10、f Drop Forgers and British Bolt, Nut, Screw and Rivet Federation Stampers British Plastics Federation North East Coast Institution of Engineers and British Valve Manufacturers Association Shipbuilders Hydraulic Association Water-tube Boilermakers Association Institute of Welding Manufacturers of pip

11、es and flanges Amendments issued since publication Amd. No. Date of issue Comments 5808 March 1966 6205 July 1967 1850 October 1975 Indicated by a sideline in the marginBS778:1966 BSI 01-2000 i Contents Page Co-operating organizations Inside front cover Foreword ii Part 1. Screwed flange joints and

12、pipes 1.1 Scope 1 1.2 Information to be supplied by the purchaser 1 1.3 Materials and process of manufacture 1 1.4 Dimensions, tolerances and workmanship 1 1.5 Screwing of pipes and flanges 2 1.6 Method of attaching flanges 3 1.7 Marking 3 Part 2. Pipes for use with welding neck flanges 2.1 Scope 10

13、 2.2 Information to be supplied by the purchaser 10 2.3 Materials and process of manufacture 10 2.4 Dimensions and tolerances 10 2.5 Jointing 10 2.6 Bolting 10 2.7 Welding 10 2.8 Marking 10 Part 3. Pipes for use with compression type joints 3.1 Scope 11 3.2 Information to be supplied by the purchase

14、r 11 3.3 Materials and process of manufacture 11 3.4 Dimensions and tolerances 11 3.5 Marking 11 Appendix A Design requirements 13 Appendix B Metric dimensions 14 Figure 1 4 Figure 2 4 Figure 3 4 Figure 4 6 Figure 5 6 Figure 6 6 Figure 7 6 Figure 8 7 Figure 9 7 Table 1 Dimensions of pipes 2 Table 2

15、Rectangular two-bolted hydraulic pipe flanges for designpressureof1500 lbf/in 2 4 Table 3 Rectangular two-bolted hydraulic pipe flanges for designpressureof2500 lbf/in 2 5 Table 4 Rectangular two-bolted hydraulic pipe flanges for designpressureof5000 lbf/in 2 5 Table 5 Square and circular 4 and 6 bo

16、lted hydraulic pipe flanges fordesignpressureof1500 lbf/in 2 6 Table 6 Square and circular 4 and 6 bolted hydraulic pipe flanges fordesignpressureof2500 lbf/in 2 8 Table 7 Square and circular 4 and 6 bolted hydraulic pipe flanges fordesignpressureof5 000 lbf/in 2 9 Table 8 Dimensions of pipes 11 Tab

17、le 9 Dimensions of pipes 12BS778:1966 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 bolts, screws and nuts. BS 1083, Precision hexagon bol

18、ts, 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 (UNC and UNF threads). Heavy series. BS 2051, Tube an

19、d 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 and UNF threads). Normal series. BS 2779, Fastening t

20、hreads 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. The first edition of this standard was published

21、in 1938 and dealt with screwed flange joints for pipelines for pressures up to 4 500 lbf/in 2 , but included only recommended minimum thickness for pipes for such pipelines. In the 1951 editioncomplete specifications for flanges and pipes for working pressures up to4500 lbf/in 2were given, the flang

22、es 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 that standard are called for in this revision. At the

23、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 that the flanges were adequate for the design pressu

24、res 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 together to grip a ductile joint ring was not used fo

25、r 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 covers a range of pipe sizes 17 / 32in o.d. to 5 1 / 2i

26、n 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 12 3 / 4in o.d. Part 3 gives a range of pipes and materials for use with the type of compression joint specified in BS 2051, “Tube and pipe fittings for engineering purpos

27、es”, Part3, “Steel compression pipe fittings” in sizes 0.250 in to 2.000 in o.d., and for design pressures not exceeding 6 000 lbf/in 2 .BS778:1966 BSI 01-2000 iii 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) ha

28、s been used in this standard. It is the force which, when acting on a body of mass one pound, gives it an acceleration 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 shou

29、ld be made to the corresponding values in the following ISO Recommendations: ISO R 64, “Steel tubes, outside diameters”. 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 conversi

30、on factors and tables of conversion contained in BS350,“Conversion factors and tables” be used. Attention is also 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

31、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, pagesi toiv, pages1to14 and a back cover. This standard has

32、 been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.iv blankBS778:1966 BSI 01-2000 1 Part 1. Screwed flange joints and pipes 1.1 Scope 1.1.1 This part covers steel pipes and flange joints for hydraulic p

33、urposes employing working fluids such as water and oil in sizes from 17 / 32in to 5 1 / 2in outside diameter, suitable for the following design pressures: 1) up to and including 1 500 lbf/in 2 2) above 1 500 lbf/in 2up to and including2500lbf/in 2 3) above 2 500 lbf/in 2up to and including5000lbf/in

34、 2 . The joint comprises freely fitting flanges screwed on to the pipe with a joint ring between the ends of the pipes themselves. 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 p

35、ipe and grade of steel required by the designation given in BS 3601 1) . 3) Outside diameter and thickness (see Table 1) and length of 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 Tab

36、le 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 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

37、Materials and process of manufacture 1.3.1 Pipes. The pipes shall comply with the requirements of BS 3601 1)except for the hydraulic test pressure and shall be of the following types and grades: The hydraulic test pressure shall be 1 1 / 2times the design pressure given in 1.1. 1.3.2 Flanges. The fl

38、anges shall be made from steelcomplying with any of the grades given in BS1501-151 for plates, BS 1502-151 for bars and BS 1503-161 for forgings 2) . 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 jo

39、int rings shall be made of copper to BS 899 3) . Soft materials which are likely to be extruded shall not be used. 1.3.4 Bolts and nuts. The bolts and nuts shall be in accordance with BS 916 4)or BS 1083 4)or where bolts with unified threads are required, in accordance with BS 1768 4) , BS 1769 4)or

40、 BS2708 4) . The bolts shall be made from steel having a minimum tensile strength of 28 tonf/in 2 . 1.4 Dimensions, tolerances and workmanship 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

41、appropriate to the screw threads, which are utilized in joining the pipes. The thicknesses tabulated are those appropriate to the design conditions specified (see Appendix A). 1) BS 3601, “Steel pipes and tubes for pressure purposes. Carbon steel: ordinary duties”. Type of pipe Grade of steel Hot fi

42、nished 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 unfired pressure vessels. Plates”. BS 1502, “Steels for fired and unfired pressure vessels. Sections and bars”. (In course of preparation.) BS 1503, “Steel

43、s for fired and unfired pressure vessels. Forgings”. 3) BS 899, “Rolled copper sheet, strip and foil”. 4) BS 916, “Black bolts, screws and nuts”. BS 1083, “Precision hexagon bolts, screws and nuts”. BS 1768, “Unified precision hexagon bolts, screws and nuts (UNC and UNF threads). Normal series”. BS

44、1769, “Unified black hexagon bolts, screws and nuts (UNC and UNF threads). Heavy series”. BS 2708, “Unified black square and hexagon bolts, screws and nuts (UNC and UNF threads). Normal series”. BS778:1966 2 BSI 01-2000 Table 1 Dimensions of pipes 1.4.1.2 Tolerances. The pipes are subject to the man

45、ufacturing tolerances specified in BS 3601 5) , 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 accordan

46、ce with Table 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

47、 sufficiently flat to enable the bolt heads and nuts to hold squarely otherwise the back of the flanges shall be machined or spot-faced. Thebolt holes shall be drilled and for 5 / 8in bolts shall be 1 / 16in larger in diameter than the bolts and for 3 / 4in bolts and above shall be 1 / 8in larger in

48、 diameter than the bolts. 1.4.3 Joint rings. The dimensions of copper joint rings shall be in accordance with Table 2 to Table 7. The dimensions of joint rings of other materials shall be specified by the purchaser. 1.4.4 Bolting. The dimensions of the bolts shall be in accordance with Table 2 to Ta

49、ble 7 inclusive. 1.5 Screwing of pipes and flanges 1.5.1 The pipes and flanges shall be screwed with parallel threads in accordance with BS 2779 6) , the pipe being screwed to BSP F Medium class and the bore of the flange to BSP F Normal class. The BSP size and the length of thread appropriate to this standard are included in Table 2 to Table 7. The threads shall be clean and well cut. Pipe outside diameter Thickness (in) for Design pressure (lbf/in 2 ) 1 500 2 500 5 000 Steel 22 Steel 27 Steel 22 Steel 27 Steel 27 Oil Water Oil Water Oil Water