1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS 143 tees B1; male and
2、female tees B4; crosses C1 5 Table 4 Elbows, reducing A1; male and female elbows, reducing A4 6 Table 5 458 elbows A1/458;4 58male and female elbows A4/458 7 Table 6 Tees, reducing on the branch B1; tees, increasing on the branch B1 8 Table 7 Tees, reducing on the run and branch B1; tees, reducing o
3、n the run and equal on the branch B1 9 Table 8 Bends D1; male and female bends D4; male bends D8; pitcher tees E1; twin elbows E2 10 Table 9 458 male and female bends D4/458 10 Table 10 Pitcher tees, reducing on the branch E1; pitcher tees, reducing on the run E1; pitcher tees, reducing on the branc
4、h and run E1 11 Table 11 Return bends Kb1 12 Table 12 Sockets M2; sockets, reducing M2; sockets, eccentric, reducing M3 13 Table 13 Bushes N4 14 Table 14 Hexagon nipples N8; hexagon nipples, reducing N8 15 Table 15 Backnuts P4 16 Table 16 Caps T1; plain plugs T8; beaded plugs T9; countersunk plugs T
5、11; alternative slotted head plugs for sizes 5 and 6 17 Table 17 Unions, flat seat U1; unions, taper seat U11; male and female unions, taper seat U12 18 Table 18 Elbow unions, taper seat UA11; male and female elbow unions, taper seat UA12 18 Table 19 Gaskets for unions, flat seat U1 19 Table 20 Tole
6、rance on length 19 Table 21 Minimum depth of spanner flats 19 Table 22 Jointing threads 20 Table 23 Temperature/pressure ratings 20 Table 24 Design test pressures 20 Table A.1 Relationship between fitting size and nominal size (DN) 23ii BSI 03-2000 BS 143 2) category 2: BS 143 design only, in a full
7、 range of malleable cast iron fitting sizes and types with threads conforming to ANSI/ASME B1.20.1 (NPT); 3) category 3: BS 143 design only, in a limited range of cast copper alloy fitting sizes and types, with threads conforming to BS 21 (ISO 7-1) or ANSI/ASME B1.20.1 (NPT). These fittings are for
8、general purposes for transmission of fluids and gases up to the limits of pressure and temperature specified in this British Standard. They are intended for connection of elements with threads conforming to BS 21 (ISO 7-1) or ANSI/ASME B1.20.1 (NPT), in sizes 1/8 to 6 for malleable cast iron fitting
9、s and sizes 1/8 to 2 for cast copper alloy fittings. NOTE For use in conditions outside the pressure and temperature limits specified in this British Standard, reference should be made to the manufacturer. 2 Normative references The following normative documents contain provisions that, through refe
10、rence in this text, constitute provisions of this British Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. For undated references, the latest edition of the publication referred to applies. BS 21:1985, Specification for pipe threads f
11、or tubes and fittings where pressure-tight joints are made on the threads (metric dimensions). BS 2779:1986, Specification for pipe threads for tubes and fittings where pressure-tight joints are not made on the threads (metric dimensions). BS EN 1562:1997, Founding Malleable cast irons. BS EN 1982:1
12、999, Copper and copper alloys Ingots and castings. BS EN 10204:1991, Metallic products Types of inspection documents. BS EN ISO 6708:1996, Pipework components Definition and selection of DN (nominal size). ANSI/ASME B1.20.1:1983, Pipe threads, general purpose (inch). 3 Terms and definitions For the
13、purposes of this standard, the terms and definitions given in BS EN ISO 6708 and the following apply. 3.1 fitting connecting piece of one or more parts 3.2 jointing thread thread conforming to BS 21 3.3 fastening thread thread conforming to BS 2779 3.4 fitting size designation of thread size of thre
14、aded outlet NOTE See 13.2 for fittings with more than one thread size. 3.5 nominal size see BS EN ISO 6708 NOTE 1 Nominal size is designated by the letters DN followed by a number. NOTE 2 Guidance on the relationship between fitting size and nominal size is given in annex A. NOTE 3 Nominal size shou
15、ld not be used for designation of fitting size. 3.6 reinforcement additional material on the outside diameter of an internally threaded fitting in the form of a band or bead 3.7 rib local and axially aligned additional material on the outside or inside of a fitting used to assist in manufacturing or
16、 assembly 3.8 outlet internally or externally threaded end of a fitting that can connect to a tube, fitting or other component 3.9 run two principal axially aligned outlets of fittings with more than two outlets 3.10 branch side outlet(s) of a tee, pitcher tee or cross2 BSI 03-2000 BS 143 grades EN-
17、GJMB-350-10 or EN-GJMB-300-6 for fittings in blackheart malleable cast iron. 5.1.2 Other ferrous materials Other ferrous materials with mechanical properties at least equivalent to the malleable cast irons specified in 5.1.1 may be used for straight fittings up to and including 3/8, but shall not be
18、 used for unions or for larger fittings. 5.1.3 Cast copper alloy Cast copper alloy for fittings shall conform to BS EN 1982. The grade of material shall be selected from the following: symbol CuSn3Zn8Pb5-C, alloy no. CC 490K; symbol CuSn5Zn5Pb5-C, alloy no. CC 491K; symbol CuSn7Zn2Pb3-C, alloy no. C
19、C 492K. 5.2 Gasket material If the purchaser states that the gasket could come into contact with potable water (see annex B) the material shall either: conform to annex C; or conform to the purchasers own specification. NOTE If the purchaser does not indicate a gasket material, the gasket material i
20、s not covered by this British Standard. 5.3 Hot dip zinc coating 5.3.1 General If zinc coating protection is required on malleable cast iron fittings, it shall be applied by the hot dip process and shall conform to 5.2.2 to 5.2.4. NOTE For fittings of other ferrous materials (see 5.1.2) alternative
21、zinc coating may be provided by agreement with the purchaser. 5.3.2 Chemical composition The content by mass of the accompanying elements in the finish zinc coating shall not exceed the following: aluminium (Al): 0.1 %; antimony (Sb): 0.01 %; arsenic (As): 0.02 %; bismuth (Bi): 0.01 %; cadmium (Cd):
22、 0.01 %; copper (Cu): 0.1 %; lead (Pb): 1.6 % (or by agreement, 1.8 %); tin (Sn): 0.1 %. 5.3.3 Coating mass per surface unit The surface related mass of the zinc coating shall be not less than 500 g/m 2 , as a mean of five fittings. (This corresponds to a medium layer thickness of 70mm.) The surface
23、 related mass of the zinc coating shall not be less than 450 g/m 2 (63mm) measured on any individual sample. NOTE The medium layer thickness s of the zinc coating, in micrometres, can be calculated by using the approximation formula: s = m A 7.2 where m A is the surface related mass of the zinc coat
24、ing in g/m 2 . 5.3.4 Surface condition Zinc coating on the internal surface of the fitting shall be continuous, except for with machined black surfaces. The internal zinc coating shall be free from zinc blisters, zinc burrs and non-metallic remainders. NOTE In the special case of larger material cro
25、ss-sections, it is permissible for the iron-zinc alloy phases to grow through. 5.4 Despatch conditions of finished fittings The surfaces of fittings shall be free of polycyclic aromatic hydrocarbons. BSI 03-2000 3 BS 143 c) hollow type for sizes 5 and 6. 6.7 Two typical types of seat for unions and
26、their designations are given in Tables 17 and 18. Unions with other types of seat design and unions with seats of materials other than specified in 5.1 may be considered to conform to this standard if they conform to Tables 17 and 18 and the other requirements of this standard. (These unions do not
27、have a formal designation.) Gaskets for type U1 unions shall conform to Table 19. If the gasket could come into contact with potable water, the gasket material shall conform to annex C. BSI 03-2000 5 BS 143 male and female elbows A4; tees B1; male and female tees B4; crosses C1 Elbows A1 Male/female
28、 elbows A4 Tees B1 Male/female tees B4 Crosses C1 Fitting size Dimensions A1 A4 B1 B4 C1 abc Cat. 2 Cat. 3 Cat. 2 Cat. 3 Cat. 2 Cat. 3 Cat. 1 Cat. 2 Cat. 2 Cat. 3 mm mm mm 1 92 5 2 12 8 2 53 2 28 37 41 3 34 34 8 1111111113 85 25 4 1 1 1 1 1 1 4 56 0 1 1 1 1 1 1 5 06 5 2222225 87 4 2 2 2 2 6 98 8 333
29、37 89 8 44449 61 1 8 551 1 5 661 3 1 NOTE For an explanation of the categories see clause 1.6 BSI 03-2000 BS 143 male and female elbows, reducing A4 Elbows, reducing A1 Male and female elbows, reducing A4 Fitting size Dimensions A1 A4 abc Cat. 1 Cat. 2 Cat. 1 Cat. 2 mm mm mm 3 2 32 3 3 3 2 52 5 3 2
30、62 6 3 3 30 31 40 1 3 13 13 32 34 51 1 3 1 3 35 36 46 13 13 3 43 9 1 3 3 64 1 1 314 04 2 1 3 13 3 94 4 1 314 24 6 2 3 12 3 14 64 8 2 3 1 4 45 1 2 3 1 5 25 5 NOTE For an explanation of the categories see clause 1. BSI 03-2000 7 BS 143 4 58male and female elbows A4/458 458 elbows A1/458 458 male and f
31、emale elbows A4/458 Fitting size Dimensions A1/458 A4/458 ab Category 1 Category 2 Category 1 Category 2 mm mm 1 9 2 0 22 28 2 5 12 8 1 3 3 1 3 6 24 3 2 2 2 5 06 2 3335 57 0 446 6 668 8 NOTE For an explanation of the categories see clause 1.8 BSI 03-2000 BS 143 tees, increasing on the branch B1 Tees
32、, reducing on the branch B1 Tees, increasing on the branch B1 Tees, reducing on the branch Fitting size Dimensions Fitting size (cont.) Dimensions (cont.) Category 1 Category 2 (1) and (2)3 (3) a mm b mm Category 1 (1) and (2)3 (3) Category 2 (1) and (2)3 (3) a mm b mm 3 23 23 23 23 41 57 3 24 24 23
33、 23 44 59 3 26 26 2314 7 6 0 3 26 27 231 52 62 3 28 28 231 55 63 3 30 31 2326 1 6 6 1 3 28 31 33 33 51 68 1 3 30 32 33 33 51 68 1 3 32 34 3315 1 6 7 1 3 35 36 33 1 55 70 1 3 34 38 33 1 58 71 1 3 36 41 3326 4 7 3 1 31 4 04 2 3 3 2 72 76 1 3 36 42 4314 3 15 6 8 1 1 3 38 44 43 1 43 1 61 83 1 31 4 24 64
34、 3 1 4 3 1 64 84 1 31 46 48 4327 0 8 6 2 3 38 48 43 2 43 2 77 89 2 3 40 50 4338 4 9 2 2 3 1 4 45 26 336 3 3 92 121 2 3 1 48 54 6346 3 4 105 125 2 3 1 52 55 Tees, increasing on the branch Fitting size Dimensions Fitting size (cont.) Dimensions (cont.) Category 1 (1) and (2)3 (3) Category 2 (1) and (2)3 (3) a mm b mm Category 1 (1) and (2)3 (3) Category 2 (1) and (2)3 (3) a mm b mm 3 31 30 1325 4 4 8 31 3 63 5 1 325 5 5 2 1 3 1 42 40 23 2 23 2 66 61 1 3 1 46 42 NOTE For an explanation of the categories see clause 1.
