BS 143 and 1256:2000

Committees responsible
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Types of fitting
5 Materials
6 Design options
7 Dimensions and tolerances
8 Threads
9 Manufacture
10 Characteristics
11 Assembly
12 Testing and inspection
12 Designation of fittings
14 Marking
Annex A (informative) Relationship between fitting
                        size and nominal size DN
Annex B (normative) Information to be obtained
                        from the purchaser
Annex C (normative) Effect of non-metallic materials
                        on water quality
Bibliography
Figures
1 - Forms of reinforcement
2 - Temperature/pressure ratings
3 - Outlets of fittings with more than two outlets
Tables
1 - Index of fitting types, symbols and specifying tables
      of this British Standard
2 - Design options
3 - Elbows A1; male and female elbows A4; tees B1; male
      and female tees; crosses C1
4 - Elbows, reducing A1; male and female elbows, reducing
      A4
5 - 45 degree elbows A1/45 degree; 45 degree male and
      female elbows A4/45 degree
6 - Tees, reducing on the branch B1; tees, increasing on
      the branch B1
7 - Tees, reducing on the run and branch B1; tees, reducing
      on the run and equal on the branch B1
8 - Bends D1; male and female bends D4; male bends D8;
      pitcher tees E1; twin elbows E2
9 - 45 degree male and female bends D4/45 degree
10 - Pitcher tees, reducing on the branch E1; pitcher tees,
      reducing on the run E1; pitcher tees, reducing on the
      branch and run E1
11 - Return bends Kb1
12 - Sockets M2; sockets, reducing M2; sockets, eccentric,
      reducing M3
13 - Bushes N4
14 - Hexagon nipples N8; hexagon nipples, reducing N8
15 - Backnuts P4
16 - Caps T1; plain plugs T8; beaded plugs T9; countersunk
      plugs T11; alternative slotted head plugs for sizes
      5 and 6
17 - Unions, flat seat U1; unions, taper seat U11; male
      and female unions, taper seat U12
18 - Elbow unions, taper seat UA11; male and female
      elbow unions, taper seat UA12
19 - Gaskets for unions, flat seat U1
20 - Tolerance on length
21 - Minimum depth of spanner flats
22 - Jointing threads
23 - Temperature/pressure ratings
24 - Design test pressures
Table A.1 - Relationship between fitting size and nominal
            size (DN)

Defines requirements for design and performance of threaded pipe fittings in malleable cast iron and cast copper alloy for two basic designs, ie: with taper external and taper internal threads and with taper external and parallel internal threads.

This British Standard specifies requirements for design and performance of threaded pipe fittings in malleable cast iron and cast copper alloy for two basic designs: BS143, with taper external and taper internal threads; BS1256, with taper external and parallel internal threads. This British Standard applies to fittings in the following categories: category1: BS143 design and BS1256 design, in a limited range of malleable cast iron fitting sizes and types with threads conforming to BS21 (ISO7‑1), and that are not included in BSEN10242; category2: BS143 design only, in a full range of malleable cast iron fitting sizes and types with threads conforming to ANSI/ASMEB1.20.1 (NPT); category3: BS143 design only, in a limited range of cast copper alloy fitting sizes and types, with threads conforming to BS21 (ISO7‑1) or ANSI/ASMEB1.20.1 (NPT). These fittings are for 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 BS21 (ISO7‑1) or ANSI/ASMEB1.20.1 (NPT), in sizes 1/8 to 6 for malleable cast iron fittings 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.