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1、BRITISH STANDARD OBSOLESCENT OCTOBER 1988 BS 78-2:1965 Incorporating Amendment No. 1 Specification for Cast iron spigot and socket pipes (vertically cast) and spigot and socket fittings Part 2: Fittings UDC 621.643.2:621.643.413:669.13 Licensed Copy: London South Bank University, London South Bank U
2、niversity, Fri Dec 08 11:26:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 78-2:1965 This British Standard, having been approved by the Iron and Steel Industry Standards Committee and endorsed by the Chairman of the Engineering Divisional Council, was published under the authority of the General C
3、ouncil on 2 February 1965 BSI 05-2000 First published October 1917 First revision August 1938 Second revision Part 1 October 1961 Part 2 February 1965 The following BSI references relate to the work on this standard: Committee reference ISE/16 Draft for comment D 63/7575 ISBN 0 580 00541 0 Co-operat
4、ing organizations The Iron and Steel Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Alloy Steels AssociationInstitution of Production Engineer
5、s British Bolt, Nut, Screw and Rivet FederationInstitution of Structural Engineers British Cast Iron Research Association*Iron and Steel Board British Constructional Steelwork AssociationIron and Steel Institute British Electrical and Allied ManufacturersJoint Iron Council AssociationLloyds Register
6、 of Shipping British Iron and Steel FederationMinistry of Aviation British Ironfounders AssociationMinistry of Defence, Army Department British Mechanical Engineering FederationMinistry of Defence, Navy Department British Railways BoardMinistry of Labour (H.M. Factory Inspectorate) British Steel Cas
7、tings Research AssociationMinistry of Transport Council of Ironfoundry AssociationsNational Association of Drop Forgers and Council of Iron ProducersStampers Crown Agents for Oversea Governments andNational Physical Laboratory (D.S.I.R.) Administrations*Oil Companies Materials Association* Engineeri
8、ng Equipment Users Association*Royal Institute of British Architects Federation of Civil Engineering ContractorsShipbuilding Employers Federation Institute of British Foundrymen*Society of British Aerospace Companies Ltd. Institute of Iron and Steel Wire ManufacturersSociety of Motor Manufacturers a
9、nd Institute of Marine EngineersTraders Ltd. Institution of Civil Engineers* Institution of Mechanical Engineers (Automobile Division) The scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrus
10、ted with the preparation of this British Standard: British Valve Manufacturers AssociationInstitution of Public Health Engineers British Waterworks AssociationInstitution of Water Engineers Gas CouncilMinistry of Housing and Local Government Institution of Gas EngineersPost Office Institution of Mec
11、hanical EngineersIndividual firms Institution of Municipal Engineers Amendments issued since publication Amd. No.Date of issueComments 5731January 1966Indicated by a sideline in the margin Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:26:04 GMT+00:00 2006,
12、Uncontrolled Copy, (c) BSI BS 78-2:1965 BSI 05-2000i Contents Page Co-operating organizationsInside front cover Forewordii Section 1. General1 1Scope1 2General1 3Lengths and dimensions1 4Marking1 5Quality of metal used in casting fittings1 6Quality control1 7Mode of casting1 8Removal from moulds2 9F
13、reedom from defects2 10Gauging2 11Tolerances on thickness and diameter of fittings2 12Hydrostatic test2 13Coating3 14Weighing and marking weights3 15Tolerances on standard weights3 16Inspection3 17Manufacturers certificate3 18Testing facilities3 Section 2. Specific requirements4 Appendix A Conversio
14、n factors56 Appendix B Extracts from Tables 4 and 5 of 1938 edition of BS 7856 Table 1 Tolerances on thickness and diameter of fittings2 Table 2 Hydrostatic test pressures3 Table 3 Dimensions of spigots and sockets, class AB4 Table 4 Dimensions of spigots and sockets, class CD6 Table 5 Dimensions an
15、d weights of 90 bends8 Table 6 Dimensions and weights of 45 bends9 Table 7 Dimensions and weights of 221/2 bends10 Table 8 Dimensions and weights of 111/4 bends11 Table 9 Dimensions and weights of 3 inch and 4 inch hydrant bends12 Table 10 Dimensions and weights of duck foot bends13 Table 11 Dimensi
16、ons and weights of 90 elbows15 Table 12 Dimensions and weights of hydrant tees16 Table 13 Dimensions, capacities and weights of condensate receivers17 Table 14 Dimensions and weights of collars19 Table 15 Dimensions and weights of tapers21 Table 16 Dimensions and weights of angle branches29 Table 17
17、 Dimensions and weights of tees35 Table 18 Dimensions and weights of crosses41 Table 19 Dimensions and weights of flanged sockets and flanged spigots44 Table 20 Dimensions and weights of plugs45 Table 21 Dimensions and weights of caps49 Licensed Copy: London South Bank University, London South Bank
18、University, Fri Dec 08 11:26:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 78-2:1965 ii BSI 05-2000 Page Table 22 Dimensions and weights of spigot and socket hatchboxes, class AB53 Table 23 Dimensions of gaskets for hatchboxes55 Licensed Copy: London South Bank University, London South Bank Unive
19、rsity, Fri Dec 08 11:26:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 78-2:1965 BSI 05-2000iii Foreword This standard makes reference to the following British Standards: BS 10, Flanges and bolting for pipes, valves and fittings. BS 18, Methods for tensile testing of metals. BS 78, Cast iron spigo
20、t and socket pipes and fittings Part 1: Pipes. BS 1211, Centrifugally cast (spun) iron pressure pipes for water, gas and sewage. BS 1452, Grey iron castings. BS 2035, Cast iron flanged pipes and flanged fittings. This revised British Standard has been authorized by the Iron and Steel Industry Standa
21、rds Committee and is a companion to BS 2035, “Cast iron flanged pipes and flanged fittings” and to BS 1211, “Centrifugally cast (spun) iron pipes for water, gas and sewage”. The standardization of cast iron pipes was first undertaken in 1903 as a result of a request received from the Institution of
22、Water Engineers (then the British Association of Water Engineers) and a British Standard Specification was issued in 1917. The standard was revised in 1938. The present edition has been divided into two parts. Part 1 deals with cast iron spigot and socket pipes, vertically cast, and Part 2 with cast
23、 iron fittings for use with pipes manufactured in accordance with BS 78-1 and BS 1211. Only two classes of fittings, AB and CD, are specified as against the four for pipes. The specified dimensions and pressures conform to the last letter of the classification code, that is B and D respectively, tho
24、ugh the AB fittings are intended for use with Class A or B pipes, and CD fittings with Class C or D pipes. Some simplification has been achieved in 30 inch diameter and over by eliminating the external diameter applicable to Class AB pipes and fittings in BS 78:1938, and adopting for both classes th
25、e external diameter previously used for Class CD only. The fittings covered by this standard have spigot and socket ends to suit the traditional lead-caulked joint, but increasing use is being made of various forms of mechanical joint in which the seal is achieved by means of a suitably retained gas
26、ket. It has not been found possible to include such joints in the present standard without restricting the development of these alternative forms of joint. The testing procedure now adopted has been somewhat modified from that given in the previous edition of BS 78. The taking of test bars for tensi
27、le and transverse tests to represent the days output has never been considered satisfactory by many users because the test pieces could not be identified with any particular fittings. It has been decided to take advantage of the hydrostatic test applied at the works to prove the strength of the mate
28、rial of each individual fitting by subjecting it to a test pressure higher than that previously specified. Manufacturers will continue to take tensile tests to check the quality of the metal, and records of these control tests will be available to the purchasers or their representatives. Certain nom
29、inal internal diameters have been omitted from this revision as they are no longer in common use. The diameters now specified have been divided into “preferred and “non-preferred sizes. It is hoped, where possible, only “preferred sizes will be ordered. NOTE 1Metric equivalents of British units are
30、not given in this standard. Some of the nominal dimensions of pipes manufactured in metric units and British units overlap and it would, therefore, be very confusing if metric equivalents were given when the equivalent of a British size was only slightly different from the actual metric size. Howeve
31、r, to assist a reader more familiar with metric than British units, conversion factors are given in Appendix A. NOTE 2In place of the customary, but incorrect, use of the pound or ton as a unit of force, the units called a pound force (abbreviation lbf) and ton force (tonf) have been used in this st
32、andard. These are the forces which when acting on a body of mass one pound and one ton respectively, give them an acceleration equal to that of standard gravity. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:26:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
33、BS 78-2:1965 iv BSI 05-2000 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 pa
34、ges This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 58 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: Londo
35、n South Bank University, London South Bank University, Fri Dec 08 11:26:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 78-2:1965 BSI 05-20001 Section 1. General 1 Scope Part 2 of this British Standard covers cast iron spigot and socket fittings for use with pipes to Part 1 of this standard, and to
36、 BS 1211, “Centrifugally cast (spun) iron pipes for water, gas and sewage”. 2 General The fittings shall be of cast iron and shall conform in every respect to this standard, but in cases of fittings ordered and supplied with some form of mechanical joint, the body only of the fittings shall conform
37、to all the relevant requirements of the standard. For valve bodies the continued use of the socket form specified in BS 78:1938 is permissible. In Appendix A extracts from Table 4 and Table 5 of BS 78:1938 have been reproduced giving the socket details. The diagrams appearing in Table 20 and Table 2
38、1 show designs of plugs and caps suitable for the specified hydraulic test pressures. Manufacturers may, at their own discretion, supply plugs and caps to alternative designs, provided such castings are suitable for, and have been subjected to, the specified hydrostatic test pressures, and the joint
39、ing dimensions are maintained. 3 Lengths and dimensions The lengths, dimensions and shape of the fittings shall be in accordance with the appropriate drawings and tables in Section 2. 4 Marking Each fitting shall have cast on it the class letters, the manufacturers name or identification mark, the l
40、ast two digits of the year of manufacture and the number of this standard, the markings shall be on or adjacent to the socket. The fittings shall, in addition, have cast on them marks indicating the following: Bends. The nominal internal diameter in inches and the angle in degrees subtended by the b
41、end. Tees, crosses and angle branches. The nominal internal diameter in inches of the main body and of the branch or branches. Hydrant bends and tees. The nominal internal diameter in inches of the main body. Tapers. The nominal internal diameter in inches at each end. Other standard fittings. The n
42、ominal internal diameter in inches of the corresponding pipe for which they are intended. NOTEThe mark “BS 78 on the product is a claim by the manufacturer that it complies with the requirements of the standard. The British Standard Institution is the owner of the registered certification trade mark
43、 shown below. This mark can be used only by manufacturers licensed under the certification mark scheme operated by the BSI. The presence of this mark on a product is an independent assurance that the goods have been produced to comply with the requirements of the British Standard under a system of s
44、upervision, control and testing operated during manufacture and including periodical inspections at the manufacturers works in accordance with the certification mark scheme of the BSI. Further particulars of the terms of licence may be obtained from the Director, British Standards Institution, 2 Par
45、k Street, London, W.1. 5 Quality of metal used in casting fittings The metal used for the manufacture of the fittings shall be good quality grey cast iron, having a tensile strength of not less than 10 tonf/in2 on a test bar of 1/2 in2 cross-sectional area and machined from a 1.2 in diameter paralle
46、l bar as cast, to conform to the recommended dimensions for standard proportional round test pieces given in BS 18, “Methods for tensile testing of metals”. The metal shall be prepared at the discretion of the manufacturer in a cupola, active mixer or other suitable furnace. NOTE 1The tensile streng
47、th of 10 tonf/in2 is equivalent to cast iron conforming with Grade 10, BS 1452, “Grey iron castings”. NOTE 2The tensile strength obtained on the test bar represents the quality of the metal from which the fittings are cast and is not necessarily an indication of the tensile strength of the castings
48、themselves. 6 Quality control The manufacturer shall undertake to cast each day, as required for metallurgical control, tensile test bars from the same metal as is used for the casting of the fittings. The manufacturer shall keep records of the tensile tests made and these records shall be available
49、 for inspection by the purchaser or his representative. 7 Mode of casting All fittings shall be cast in sand moulds in such a manner as to ensure their soundness. Any head of metal shall afterwards be removed and the finished casting shall conform to the dimensions and shape required. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:26:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 78-2:1965 2 BSI 05-2000 8 Removal from moulds The fittings shall not be removed from their