BS 143 & 1256: 2000

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BRITISH STANDARD BS 143 & 1256:2000

ICS 23.040.40

NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW

Threaded pipe fittings inmalleable cast iron andcast copper alloy

Licensed copy:RMJM, 30/08/2005, Uncontrolled Copy, © BSI

This British Standard, havingbeen prepared under thedirection of the EngineeringSector Committee, was publishedunder the authority of theStandards Committee and comesinto effect on 15 March 2000

BSI 03-2000

The following BSI referencesrelate to the work on thisstandard:Committee reference ISE/19/-/3Draft for comment 99/707033 DC

ISBN 0 580 33142 3

BS 143 & 1256:2000

Amendments issued since publication

Amd. No. Date Comments

Committees responsible for thisBritish Standard

The preparation of this British Standard was entrusted by Technical CommitteeISE/19, Ferrous pipe fittings (excluding cast iron), to Panel ISE/19/-/3, Panel forrevision of BS 143 & 1256, upon which the following bodies were represented:

British Malleable Tube Fittings Association

British Plumbing Fittings Manufacturers' Association

Co-opted Members


BS 143 & 1256:2000

BSI 03-2000 i

Contents

PageCommittees responsible Inside front coverForeword ii

1 Scope 12 Normative references 13 Terms and definitions 14 Types of fitting 25 Materials 26 Design options 47 Dimensions and tolerances 198 Threads 199 Manufacture 20

10 Characteristics 2011 Assembly 2112 Testing and inspection 2113 Designation of fittings 2114 Marking 22

Annex A (informative) Relationship between fitting size and nominal size DN 23Annex B (normative) Information to be obtained from the purchaser 23Annex C (normative) Effect of non-metallic materials on water quality 23

Bibliography 24

Figure 1 Ð Forms of reinforcement 4Figure 2 Ð Temperature/pressure ratings 20Figure 3 Ð Outlets of fittings with more than two outlets 22

Table 1 Ð Index of fitting types, symbols and specifying tables of this BritishStandard 3Table 2 Ð Design options 4Table 3 Ð Elbows A1; male and female elbows A4; tees B1; male and femaletees B4; crosses C1 5Table 4 Ð Elbows, reducing A1; male and female elbows, reducing A4 6Table 5 Ð 458 elbows A1/458; 458 male and female elbows A4/458 7Table 6 Ð Tees, reducing on the branch B1; tees, increasing on the branch B1 8Table 7 Ð Tees, reducing on the run and branch B1; tees, reducing on the runand equal on the branch B1 9Table 8 Ð Bends D1; male and female bends D4; male bends D8; pitcher tees E1;twin elbows E2 10Table 9 Ð 458 male and female bends D4/458 10Table 10 Ð Pitcher tees, reducing on the branch E1; pitcher tees, reducing onthe run E1; pitcher tees, reducing on the branch and run E1 11Table 11 Ð Return bends Kb1 12Table 12 Ð Sockets M2; sockets, reducing M2; sockets, eccentric, reducing M3 13Table 13 Ð Bushes N4 14Table 14 Ð Hexagon nipples N8; hexagon nipples, reducing N8 15Table 15 Ð Backnuts P4 16Table 16 Ð Caps T1; plain plugs T8; beaded plugs T9; countersunk plugs T11;alternative slotted head plugs for sizes 5 and 6 17Table 17 Ð Unions, flat seat U1; unions, taper seat U11; male and female unions,taper seat U12 18Table 18 Ð Elbow unions, taper seat UA11; male and female elbow unions,taper seat UA12 18Table 19 Ð Gaskets for unions, flat seat U1 19Table 20 Ð Tolerance on length 19Table 21 Ð Minimum depth of spanner flats 19Table 22 Ð Jointing threads 20Table 23 Ð Temperature/pressure ratings 20Table 24 Ð Design test pressures 20

Table A.1 Ð Relationship between fitting size and nominal size (DN) 23


ii BSI 03-2000

BS 143 & 1256:2000

Foreword

This British Standard has been prepared by panel ISE/19/-/3. It supersedesBS 143 & 1256:1986, which is withdrawn.

In 1968, BS 143, the standard for malleable cast iron fittings, and BS 1256, whichcovered fittings with parallel internal threads and taper external threads, were revisedand incorporated into one standard, BS 143 & 1256. The 1986 revision of BS 143 & 1256was related to and followed the general format of ISO 49:1983, Malleable cast ironfittings threaded to ISO 7-1. ISO 49 was revised in 1994 and this second edition wasused as the basis for preparation of the new European Standard EN 10242, which wassubsequently adopted as BS EN 10242.

The range of fitting sizes and types specified in BS EN 10242 did not fully align withBS 143 & 1256:1986, so this revision details the fittings not covered by BS EN 10242 thatare in regular production by UK manufacturers. For malleable iron fittings, thetechnical requirements have been aligned, where appropriate, with BS EN 10242 toobviate dual production requirements, and the style of BS EN 10242 has been generallyadopted.

A British Standard does not purport to include all the necessary provisions of acontract. Users of British Standards are responsible for their correct application.

Compliance with a British Standard does not of itself confer immunityfrom legal obligations.

Summary of pages

This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to24, an inside back cover and a back cover.

The BSI copyright notice displayed in this document indicates when the document waslast issued.


BSI 03-2000 1

BS 143 & 1256:2000

1 ScopeThis British Standard specifies requirements fordesign and performance of threaded pipe fittings inmalleable cast iron and cast copper alloy for twobasic designs:

a) BS 143, with taper external and taper internalthreads;

b) BS 1256, with taper external and parallelinternal threads.

This British Standard applies to fittings in thefollowing categories:

1) category 1: BS 143 design and BS 1256 design, ina limited range of malleable cast iron fitting sizesand types with threads conforming toBS 21 (ISO 7-1), and that are not included inBS EN 10242;

2) category 2: BS 143 design only, in a full range ofmalleable cast iron fitting sizes and types withthreads conforming to ANSI/ASME B1.20.1 (NPT);

3) category 3: BS 143 design only, in a limitedrange of cast copper alloy fitting sizes and types,with threads conforming to BS 21 (ISO 7-1) orANSI/ASME B1.20.1 (NPT).

These fittings are for general purposes fortransmission of fluids and gases up to the limits ofpressure and temperature specified in this BritishStandard. They are intended for connection ofelements with threads conforming to BS 21 (ISO 7-1)or ANSI/ASME B1.20.1 (NPT), in sizes 1/8 to 6 formalleable cast iron fittings and sizes 1/8 to 2 for castcopper alloy fittings.NOTE For use in conditions outside the pressure andtemperature limits specified in this British Standard, referenceshould be made to the manufacturer.

2 Normative referencesThe following normative documents containprovisions that, through reference in this text,constitute provisions of this British Standard. Fordated references, subsequent amendments to, orrevisions of, any of these publications do not apply.For undated references, the latest edition of thepublication referred to applies.

BS 21:1985, Specification for pipe threads for tubesand fittings where pressure-tight joints are made onthe threads (metric dimensions).

BS 2779:1986, Specification for pipe threads fortubes and fittings where pressure-tight joints arenot made on the threads (metric dimensions).

BS EN 1562:1997, Founding Ð Malleable cast irons.

BS EN 1982:1999, Copper and copper alloys Ð Ingotsand castings.

BS EN 10204:1991, Metallic products Ð Types ofinspection documents.

BS EN ISO 6708:1996, Pipework components ÐDefinition and selection of DN (nominal size).

ANSI/ASME B1.20.1:1983, Pipe threads, generalpurpose (inch).

3 Terms and definitionsFor the purposes of this standard, the terms anddefinitions given in BS EN ISO 6708 and thefollowing 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 threaded 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 bya number.

NOTE 2 Guidance on the relationship between fitting size andnominal size is given in annex A.

NOTE 3 Nominal size should not be used for designation offitting size.

3.6

reinforcement

additional material on the outside diameter of aninternally threaded fitting in the form of a band orbead

3.7

rib

local and axially aligned additional material on theoutside or inside of a fitting used to assist inmanufacturing or assembly

3.8

outlet

internally or externally threaded end of a fitting thatcan connect to a tube, fitting or other component

3.9

run

two principal axially aligned outlets of fittings withmore than two outlets

3.10

branch

side outlet(s) of a tee, pitcher tee or cross


2 BSI 03-2000

BS 143 & 1256:2000

3.11

chamfer

machined or cast surface in the form of a cone atthe entrance of a thread used to assist assembly andto prevent damage to the start of the thread

3.12

face-to-face dimension

distance between the two parallel faces of axiallyaligned outlets of a fitting

3.13

face-to-centre dimension

distance between the face of an outlet and thecentral axis of an angularly disposed outlet

3.14

centre-to-centre dimension

distance between the axes of the two outlets of areturn bend

4 Types of fittingTable 1 gives the fitting types and correspondingsymbols used in this British Standard, together witha reference to the table in which their sizes anddimensions are specified.

NOTE The symbols relate to identification of fittings and may beused for designation (see 13.1).

5 Materials

5.1 Fittings

5.1.1 Malleable cast iron

Malleable cast iron for fittings shall conform toBS EN 1562. The grade of material shall be selectedfrom the following:

Ð grades EN-GJMW-400-5 or EN-GJMW-350-4 forfittings in whiteheart malleable cast iron;

Ð grades EN-GJMB-350-10 or EN-GJMB-300-6 forfittings in blackheart malleable cast iron.

5.1.2 Other ferrous materials

Other ferrous materials with mechanical propertiesat least equivalent to the malleable cast ironsspecified in 5.1.1 may be used for straight fittings upto and including 3/8, but shall not be used for unionsor for larger fittings.

5.1.3 Cast copper alloy

Cast copper alloy for fittings shall conform toBS EN 1982. The grade of material shall be selectedfrom the following:

Ð symbol CuSn3Zn8Pb5-C, alloy no. CC 490K;

Ð symbol CuSn5Zn5Pb5-C, alloy no. CC 491K;

Ð symbol CuSn7Zn2Pb3-C, alloy no. CC 492K.

5.2 Gasket material

If the purchaser states that the gasket could comeinto contact with potable water (see annex B) thematerial shall either:

Ð conform to annex C; or

Ð conform to the purchaser's own specification.

NOTE If the purchaser does not indicate a gasket material, thegasket material is not covered by this British Standard.

5.3 Hot dip zinc coating

5.3.1 General

If zinc coating protection is required on malleablecast iron fittings, it shall be applied by the hot dipprocess and shall conform to 5.2.2 to 5.2.4.

NOTE For fittings of other ferrous materials (see 5.1.2)alternative zinc coating may be provided by agreement with thepurchaser.

5.3.2 Chemical composition

The content by mass of the accompanying elementsin the finish zinc coating shall not exceed thefollowing:

Ð aluminium (Al): 0.1 %;

Ð antimony (Sb): 0.01 %;

Ð arsenic (As): 0.02 %;

Ð bismuth (Bi): 0.01 %;

Ð cadmium (Cd): 0.01 %;

Ð copper (Cu): 0.1 %;

Ð lead (Pb): 1.6 % (or by agreement, 1.8 %);

Ð tin (Sn): 0.1 %.

5.3.3 Coating mass per surface unit

The surface related mass of the zinc coating shall benot less than 500 g/m2, as a mean of five fittings.(This corresponds to a medium layer thicknessof 70 mm.) The surface related mass of the zinccoating shall not be less than 450 g/m2 (63 mm)measured on any individual sample.

NOTE The medium layer thickness s of the zinc coating, inmicrometres, can be calculated by using the approximationformula:

s =mA

7.2

where

mA is the surface related mass of the zinc coating in g/m2.

5.3.4 Surface condition

Zinc coating on the internal surface of the fittingshall be continuous, except for with machined blacksurfaces. The internal zinc coating shall be free fromzinc blisters, zinc burrs and non-metallic remainders.

NOTE In the special case of larger material cross-sections, it ispermissible for the iron-zinc alloy phases to grow through.

5.4 Despatch conditions of finished fittings

The surfaces of fittings shall be free of polycyclicaromatic hydrocarbons.


BSI 03-2000 3

BS 143 & 1256:2000

Table 1 Ð Index of fitting types, symbols and specifying tables of this British Standard

Fitting type Description Symbol Outlets type/pattern no. Table no.

A Elbows A1 Female-equal outlets 3

Female-reducing outlets 4

A4 Male/female-equal outlets 3

Male/female-reducing outlets 4

458 elbows A1/458 Female-equal outlets 5

A4/458 Male/female-equal outlets

B Tees B1 Female-equal outlets 3

Female-reducing outlets 6, 7

Female-increasing outlets 6

B4 Male/female-equal outlets 3

C Crosses C1 Female-equal outlets 3

D Bends D1 Female-equal outlets 8

D4 Male/female-equal outlets 8

D8 Male-equal outlets 8

458 bends D4/458 Male/female-equal outlets 9

E Pitcher tees E1 Female-equal outlets 10

Female-reducing outlets 10

Twin elbows E2 Female-equal outlets 8

Kb Return bends Kb1 Female-equal outlets 11

M Sockets M2 Female-equal outlets 12

Female-reducing outlets

M3 Female-reducing outlets

M4 Male/female-reducing outlets

N Bushes N4 Pattern I 13

Pattern II

Hexagon nipples N8 Male-equal 14

Male-reducing

P Backnuts P4 Ð 15

T Caps T1 Ð 16

Plugs T8 Plain pattern 16

T9 Beaded pattern

T11 Countersunk pattern

U Unions U1 Female-flat seat pattern 17

U11 Female-taper seat pattern

U12 Male/female-taper seat pattern

UA Elbow unions UA11 Female-taper seat pattern 18

UA12 Male/female-taper seat pattern


4 BSI 03-2000

BS 143 & 1256:2000

Table 2 Ð Design options

Design option Basic design Thread type Material grade

External Internal Malleable cast iron Copper alloy

1 BS 143 R Rc EN-GJMB-300-6 Ð

2 BS 1256 R Rp EN-GJMB-350-10

3 BS 143 NPT NPT EN-GJMW-350-4

EN-GJMW-400-5

4 BS 143 R Rc Ð CC 490K

5 BS 143 NPT NPT CC 491K

CC 492K

NOTE 1 The design option is for manufacturers only. It does not indicate design options available for the purchaser.NOTE 2 BS 143 and BS 1256 design fittings in malleable iron are also identified in BS EN 10242 and ISO 149 by design symbols A, B,C, or D depending on the material grade and thread type.

Band Bead

Figure 1 Ð Forms of reinforcement

6 Design

6.1 Design options are based on the basic design,thread type and material grade. Fittings shallconform to one of the design options given inTable 2.

6.2 The face-to-face, face-to-centre andcentre-to-centre dimensions of fittings shall conformto Tables 3 to 18.

NOTE The drawings in Tables 3 to 18 are diagrammatic andshould not limit the manufactured form of the fittings.

6.3 Bushes, nipples, backnuts, plugs, and unionsshall be provided with flats for assembly purposes.Flats on plugs shall be square except that for sizes 5and 6 a slotted head may be provided as shown inTable 16. Flats on other fittings (except unions) shallbe hexagonal on sizes� and below, and hexagonalor octagonal on sizes above�. Flats on unions maybe hexagonal, octagonal or decagonal.

All other fittings shall be reinforced at the internallythreaded end with a band or bead (see Figure 1)except that caps and sockets may alternatively havea polygonal shaped reinforcement.

6.4 Manufacturers may incorporate ribs at theirdiscretion. Ribs shall not project higher than theband or bead.

6.5 Backnuts shall be plain or recessed.

NOTE One face of each backnut may be machined.

6.6 Plugs shall be:

a) solid type for sizes ¡ andï;

b) solid or hollow type for sizes ® to 4;

c) hollow type for sizes 5 and 6.

6.7 Two typical types of seat for unions and theirdesignations are given in Tables 17 and 18. Unionswith other types of seat design and unions with seatsof materials other than specified in 5.1 may beconsidered to conform to this standard if theyconform to Tables 17 and 18 and the otherrequirements of this standard. (These unions do nothave a formal designation.) Gaskets fortype U1 unions shall conform to Table 19. If thegasket could come into contact with potable water,the gasket material shall conform to annex C.


BSI 03-2000 5

BS 143 & 1256:2000

Table 3 Ð Elbows A1; male and female elbows A4; tees B1; male and female tees B4; crosses C1

Elbows A1 Male/female elbows A4 Tees B1 Male/female tees B4 Crosses C1

Fitting size Dimensions

A1 A4 B1 B4 C1 a b c

Cat. 2 Cat. 3 Cat. 2 Cat. 3 Cat. 2 Cat. 3 Cat. 1 Cat. 2 Cat. 2 Cat. 3 mm mm mm

¡ Ð ¡ Ð ¡ ¡ Ð Ð Ð Ð 19 25 Ð

ï ï ï ï ï ï Ð Ð ï Ð 21 28 Ð

® ® ® ® ® ® Ð Ð ® Ð 25 32 Ð

¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ 28 37 41

� � � � � � � � � Ð 33 43 48

1 1 1 1 1 1 1 1 1 Ð 38 52 54

1ï 1ï 1ï Ð 1ï 1ï Ð Ð 1ï Ð 45 60 Ð

1¯ 1¯ 1¯ Ð 1¯ 1¯ Ð Ð 1¯ Ð 50 65 Ð

2 2 2 Ð 2 2 Ð Ð 2 Ð 58 74 Ð

2¯ Ð 2¯ Ð 2¯ Ð Ð Ð 2¯ Ð 69 88 Ð

3 Ð 3 Ð 3 Ð Ð Ð 3 Ð 78 98 Ð

4 Ð 4 Ð 4 Ð Ð Ð 4 Ð 96 118 Ð

5 Ð Ð Ð 5 Ð Ð Ð Ð Ð 115 Ð Ð

6 Ð Ð Ð 6 Ð Ð Ð Ð Ð 131 Ð Ð

NOTE For an explanation of the categories see clause 1.


6 BSI 03-2000

BS 143 & 1256:2000

Table 4 Ð Elbows, reducing A1; male and female elbows, reducing A4

Elbows, reducing A1 Male and female elbows, reducing A4


A1 A4 a b c

Cat. 1 Cat. 2 Cat. 1 Cat. 2 mm mm mm

Ð ®3ï Ð Ð 23 23 Ð

¯3ï ¯3ï Ð Ð 25 25 Ð

Ð ¯3® Ð Ð 26 26 Ð

Ð �3¯ Ð �3¯ 30 31 40

Ð 13¯ 13¯ 13¯ 32 34 51

Ð 13� Ð 13� 35 36 46

1ï3¯ 1ï3¯ Ð Ð 34 39 Ð

Ð 1ï3� Ð Ð 36 41 Ð

Ð 1ï3 1 Ð Ð 40 42 Ð

1¯3� 1¯3� Ð Ð 39 44 Ð

Ð 1¯3 1 Ð Ð 42 46 Ð

23 1 23 1 Ð Ð 46 48 Ð

23 1ï Ð Ð Ð 44 51 Ð

Ð 23 1¯ Ð Ð 52 55 Ð



BSI 03-2000 7

BS 143 & 1256:2000

Table 5 Ð 458 elbows A1/458; 458 male and female elbows A4/458

458 elbows A1/458 458 male and female elbows A4/458


A1/458 A4/458 a b

Category 1 Category 2 Category 1 Category 2 mm mm

ï ï Ð Ð 19 Ð

Ð ® Ð Ð 20 Ð

Ð ¯ Ð ¯ 22 28

Ð � Ð Ð 25 Ð

Ð 1 Ð Ð 28 Ð

Ð 1ï Ð Ð 33 Ð

Ð 1¯ Ð Ð 36 Ð

Ð 2 Ð Ð 43 Ð

2¯ 2¯ 2¯ Ð 50 62

3 3 3 Ð 55 70

4 4 Ð Ð 66 Ð

6 6 Ð Ð 88 Ð



8 BSI 03-2000

BS 143 & 1256:2000

Table 6 Ð Tees, reducing on the branch B1; tees, increasing on the branch B1

Tees, reducing on thebranch B1

Tees, increasing onthe branch B1

Tees, reducing on the branch

Fitting size Dimensions Fitting size (cont.) Dimensions(cont.)

Category 1 Category 2(1) and (2)3 (3)

amm

bmm

Category 1(1) and (2)3 (3)


amm

bmm

Ð ®3ï 23 23 2¯3¯ 2¯3¯ 41 57

Ð ¯3ï 24 24 2¯3� 2¯3� 44 59

Ð ¯3® 26 26 Ð 2¯3 1 47 60

Ð �3ï 26 27 Ð 2¯3 1ï 52 62

Ð �3® 28 28 Ð 2¯3 1¯ 55 63

Ð �3¯ 30 31 Ð 2¯3 2 61 66

Ð 13ï 28 31 33¯ 33¯ 51 68

Ð 13® 30 32 33� 33� 51 68

Ð 13¯ 32 34 Ð 33 1 51 67

Ð 13� 35 36 Ð 33 1ï 55 70

Ð 1ï3¯ 34 38 Ð 33 1¯ 58 71

Ð 1ï3� 36 41 Ð 33 2 64 73

Ð 1ï3 1 40 42 Ð 33 2¯ 72 76

Ð 1¯3¯ 36 42 43 1 43 1 56 81

Ð 1¯3� 38 44 43 1ï 43 1ï 61 83

Ð 1¯3 1 42 46 43 1¯ 43 1¯ 64 84

Ð 1¯3 1ï 46 48 Ð 43 2 70 86

Ð 23¯ 38 48 43 2¯ 43 2¯ 77 89

Ð 23� 40 50 Ð 43 3 84 92

Ð 23 1 44 52 63 3 63 3 92 121

Ð 23 1ï 48 54 63 4 63 4 105 125

Ð 23 1¯ 52 55 Ð Ð Ð Ð

Tees, increasing on the branch

Fitting size Dimensions Fitting size (cont.) Dimensions(cont.)



amm

bmm



amm

bmm

Ð ¯3� 31 30 Ð 1ï3 2 54 48

Ð �3 1 36 35 Ð 1¯3 2 55 52

Ð 13 1ï 42 40 23 2¯ 23 2¯ 66 61

Ð 13 1¯ 46 42 Ð Ð Ð Ð



BSI 03-2000 9

BS 143 & 1256:2000

Table 7 Ð Tees, reducing on the run and branch B1; tees,reducing on the run and equal on the branch B1

Tees, reducing on therun and branch

Tees, reducing on the runand equal on the branch

Tees, reducing on the run and the branch Tees, reducing on the run and equal on the branch

Fitting size Dimensions Fitting size Dimensions

Category 1(1)3 (2)3 (3)

Category 2(1)3 (2)3 (3)

amm

bmm

cmm

Category 1(1)3 (2)3 (3)

Category 2(1)3 (2)3 (3)

amm

bmm

cmm

Ð ¯3®3® 26 26 25 ¯3ï3¯ ¯3ï3¯ 28 28 25

Ð �3¯3¯ 30 31 28 Ð �3¯3� 33 33 31

Ð 13�3¯ 32 34 30 Ð 13¯3 1 38 38 34

Ð 13�3� 35 36 33 Ð 13�3 1 38 38 36

Ð 1ï3 13¯ 34 38 32 Ð 1ï3¯3 1ï 45 45 38

Ð 1ï3 13� 36 41 35 Ð 1ï3�3 1ï 45 45 41

Ð 1ï3 13 1 40 42 38 Ð 1ï3 13 1ï 45 45 42

Ð 1¯3 13 1 42 46 38 Ð 1¯3¯3 1¯ 50 50 42

Ð 1¯3 1ï3¯ 36 42 34 Ð 1¯3�3 1¯ 50 50 44

Ð 1¯3 1ï3 1 42 46 40 Ð 1¯3 13 1¯ 50 50 46

Ð 1¯3 1ï3 1ï 46 48 45 Ð 1¯3 1ï3 1¯ 50 50 48

23 1¯3¯ 23 1¯3¯ 38 48 36 23¯3 2 23¯3 2 57 57 48

Ð 23 1¯3� 40 50 38 Ð 23�3 2 58 58 50

Ð 23 1¯3 1 44 52 42 Ð 23 13 2 58 58 52

Ð 23 1¯3 1ï 48 54 46 Ð 23 1ï3 2 Ð Ð Ð

Ð 23 1¯3 1¯ 52 55 50 Ð 23 1¯3 2 58 58 55

2¯3 23 2 Ð 61 66 57 2¯3 1¯3 2¯ 2¯3 1¯3 2¯ 69 69 64

33 23 2 Ð 64 73 57 33 23 3 33 23 3 78 78 73



10 BSI 03-2000

BS 143 & 1256:2000

Table 8 Ð Bends D1; male and female bends D4; male bends D8; pitcher tees E1; twin elbows E2

Bends D1 Male/female bends D4 Male bends D8 Pitcher tees E1 Twin elbows E2


D1 D4 D8 E1 E2 a b

Cat. 1 Cat. 2 Cat. 1 Cat. 2 Cat. 3 Cat. 1 Cat. 2 Cat. 1 Cat. 2 Cat. 3 Cat. 1 Cat. 2 mm mm

Ð ï Ð ï Ð Ð Ð Ð Ð Ð Ð Ð 30 Ð

Ð ® Ð ® Ð Ð Ð Ð Ð Ð Ð Ð 36 Ð

Ð ¯ Ð ¯ Ð ¯ ¯ Ð ¯ Ð Ð ¯ 45 24

Ð � Ð � Ð � � Ð � Ð Ð � 50 28

Ð 1 Ð 1 1 1 1 Ð 1 1 Ð 1 63 33

Ð 1ï Ð 1ï Ð 1ï 1ï Ð 1ï Ð Ð 1ï 76 40

Ð 1¯ Ð 1¯ Ð 1¯ 1¯ Ð 1¯ Ð Ð 1¯ 85 43

Ð 2 Ð 2 Ð 2 2 Ð 2 Ð Ð 2 102 53

2¯ 2¯ 2¯ 2¯ Ð Ð Ð 2¯ 2¯ Ð 2¯ 2¯ 114 61

3 3 3 3 Ð Ð Ð 3 3 Ð 3 3 127 70

4 4 4 4 Ð Ð Ð 4 4 Ð Ð Ð 165 87

5 5 Ð Ð Ð Ð Ð Ð Ð Ð Ð Ð 191 Ð

6 6 6 6 Ð Ð Ð Ð Ð Ð Ð Ð 229 Ð


Table 9 Ð 458 male and female bends D4/458

458 male and female bends D4/458

Fitting size D4/458 Dimension a

Category 1 Category 2 mm

ï ï 19

® ® 21

¯ ¯ 25

� � 29

1 1 35

1ï 1ï 42

1¯ 1¯ 48

2 2 55

2¯ 2¯ 61

3 3 68

4 4 87



BSI 03-2000 11

BS 143 & 1256:2000

Table 10 Ð Pitcher tees, reducing on the branch E1; pitcher tees, reducing on the run E1;pitcher tees, reducing on the branch and run E1

Pitcher tees, reducing onthe branch E1

Pitcher tees, reducingon the run E1

Pitcher tees, reducing onthe branch and run E1

Pitcher tees, reducing on the branch E1

Fitting size(1) and (2)3 (3)

Dimensions Fitting size (cont.)(1) and (2)3 (3)

Dimensions (cont.)

amm

bmm

cmm

amm

bmm

cmm

Ð �3¯ 47 48 25 Ð 23 1ï 80 85 45

Ð 13¯ 49 51 28 Ð 23 1¯ 91 94 48

Ð 13� 53 54 30 2¯3¯ 2¯3¯ 60 75 37

Ð 1ï3¯ 51 56 30 2¯3� 2¯3� 60 75 37

Ð 1ï3� 55 58 33 2¯3 1 2¯3 1 72 85 40

Ð 1ï3 1 66 68 36 2¯3 1ï 2¯3 1ï 83 93 45

1¯3¯ 1¯3¯ 52 58 29 2¯3 1¯ 2¯3 1¯ 94 103 48

Ð 1¯3� 55 61 33 2¯3 2 2¯3 2 104 109 54

Ð 1¯3 1 66 71 36 33� 33� 63 82 39

Ð 1¯3 1ï 77 79 41 33 1¯ 33 1¯ 96 109 50

23¯ 23¯ 54 64 32 33 2 33 2 106 116 56

23� 23� 58 67 35 43 2¯ 43 2¯ 121 133 69

Ð 23 1 70 77 40 43 3 43 3 132 139 75

Pitcher tees, reducing on the run E1 Pitcher tees, reducing on the branch and run E1

Fitting size(1)3 (2)3 (3) (cat. 2)

Dimensions (mm) Fitting size(1)3 (2)3 (3) (cat. 2)

Dimensions (mm)

a b c a b c

�3¯3� 50 50 27 �3¯3¯ 47 48 24

Ð Ð Ð Ð 13�3¯ 49 51 25

Ð Ð Ð Ð 13�3� 53 54 28



12 BSI 03-2000

BS 143 & 1256:2000

Table 11 Ð Return bends Kb1

Return bends Kb1

Fitting size Kb1 Dimension a


¯ ¯ 38

� � 50

1 1 64

1ï 1ï 76

1¯ 1¯ 89

2 2 102



BSI 03-2000 13

BS 143 & 1256:2000

Table 12 Ð Sockets M2; sockets, reducing M2; sockets, eccentric, reducing M3

Sockets M2 Sockets, reducing M2 Sockets, eccentric, reducing M3

Fitting size Dimension a(min.)

mmM2 M2, reducing M3

Category 2 Category 1 Category 2 Category 3 Category 1 Category 2

ï Ð Ð Ð Ð Ð 25.5

® Ð ®3ï ®3ï Ð Ð 28.5

¯ Ð ¯3ï Ð Ð Ð 34

Ð ¯3® ¯3® Ð Ð

� Ð �3ï Ð Ð Ð 37

Ð �3® Ð Ð Ð

Ð �3¯ �3¯ �3¯ �3¯1 13ï 13ï Ð Ð Ð 43

Ð 13® Ð Ð Ð

Ð 13¯ 13¯ 13¯ 13¯Ð 13� 13� 13� 13�

1ï Ð 1ï3¯ Ð 1ï3¯ 1ï3¯ 48

Ð 1ï3� Ð 1ï3� 1ï3�Ð 1ï3 1 Ð 1ï3 1 1ï3 1

1¯ Ð 1¯3¯ Ð 1¯3¯ 1¯3¯ 52.5

Ð 1¯3� Ð 1¯3� 1¯3�Ð 1¯3 1 Ð 1¯3 1 1¯3 1

Ð 1¯3 1ï Ð 1¯3 1ï 1¯3 1ï2 Ð 23¯ Ð 23¯ 23¯ 62.5

Ð 23� Ð 23� 23�Ð 23 1 Ð 23 1 23 1

Ð 23 1ï Ð 23 1ï 23 1ïÐ 23 1¯ Ð 23 1¯ 23 1¯

2¯ 2¯3 1¯ 2¯3¯ Ð 2¯3¯ 2¯3¯ 71.5

2¯3 1 2¯3 1 Ð Ð Ð

Ð 2¯3 1ï Ð Ð Ð

Ð 2¯3 1¯ Ð 2¯3 1¯ 2¯3 1¯Ð 2¯3 2 Ð 2¯3 2 2¯3 2

3 33 1 33 1 Ð Ð Ð 77

Ð 33 2 Ð 33 2 33 2

Ð 33 2¯ Ð 33 2¯ 33 2¯4 Ð 43 2 Ð Ð Ð 91

Ð 43 2¯ Ð Ð Ð

Ð Ð Ð Ð Ð

5 Ð Ð Ð Ð Ð 105.5

6 63 3 Ð Ð Ð Ð 116.5

63 4 63 4 Ð Ð Ð

63 5 Ð Ð Ð ÐNOTE For an explanation of the categories see clause 1.


14 BSI 03-2000

BS 143 & 1256:2000

Table 13 Ð Bushes N4

Bushes N4

Fitting size Pattern Dim. amm

Fitting size (cont.) Pattern(cont.)

Dim. a(cont.)

mmCat. 1 Cat. 2 Cat. 3 Cat. 1 Cat. 2 Cat. 3

Ð ï3¡ ï3¡ I 20 2¯3¯ 2¯3¯ Ð II 40

Ð ®3¡ ®3¡ II 20 2¯3� 2¯3� Ð II

Ð ®3ï ®3ï I Ð 2¯3 1 Ð II

Ð ¯3¡ ¯3¡ II 24 Ð 2¯3 1ï Ð II

Ð ¯3ï ¯3ï II Ð 2¯3 1¯ Ð II

Ð ¯3® ¯3® I Ð 2¯3 2 Ð II

�3¡ �3¡ Ð II 26 33¯ 33¯ Ð II 44

Ð �3ï �3ï II 33� 33� Ð II

Ð �3® �3® II Ð 33 1 Ð II

Ð �3¯ �3¯ I Ð 33 1ï Ð II

Ð 13ï Ð II 29 Ð 33 1¯ Ð II

Ð 13® Ð II Ð 33 2 Ð II

Ð 13¯ 13¯ II Ð 33 2¯ Ð II

Ð 13� 13� I 43 1 43 1 Ð II 51

1ï3ï 1ï3ï Ð II 31 43 1ï 43 1ï Ð II

Ð 1ï3® Ð II 43 1¯ 43 1¯ Ð II

Ð 1ï3¯ 1ï3¯ II Ð 43 2 Ð II

Ð 1ï3� 1ï3� II Ð 43 2¯ Ð II

Ð 1ï3 1 1ï3 1 I Ð 43 3 Ð II

1¯3ï 1¯3ï Ð II 31 53 4 53 4 Ð II 59

Ð 1¯3® Ð II 63 2 63 2 Ð II 62

Ð 1¯3¯ 1¯3¯ II 63 3 63 3 Ð II

Ð 1¯3� 1¯3� II 63 4 63 4 Ð II

Ð 1¯3 1 1¯3 1 II

Ð 1¯3 1ï 1¯3 1ï I

23® 23® Ð II 35

Ð 23¯ Ð II

Ð 23� Ð II

Ð 23 1 23 1 II

Ð 23 1ï 23 1ï II

Ð 23 1¯ 23 1¯ II

NOTE 1 For an explanation of the categories see clause 1.NOTE 2 For dimension s see 7.2.


BSI 03-2000 15

BS 143 & 1256:2000

Table 14 Ð Hexagon nipples N8; hexagon nipples, reducing N8

Hexagon nipples N8 Hexagon nipples, reducing N8

Fitting size Dimension a

(min.)mm

N8 N8, reducing

Category 1 Category 2 Category 3 Category 1 Category 2 Category 3

Ð ï ï ï3¡ ï3¡ ï3¡ 34

Ð ® ® Ð ®3ï ®3ï 36

Ð ¯ ¯ Ð ¯3ï Ð 42

Ð ¯3® ¯3®

� � Ð �3® Ð 45

Ð �3¯ �3¯

Ð 1 1 Ð 13¯ Ð 50.5

Ð 13� 13�

Ð 1ï 1ï Ð 1ï3¯ Ð 54.5

Ð 1ï3� Ð

Ð 1ï3 1 1ï3 1

Ð 1¯ 1¯ Ð 1¯3� Ð 56.5

Ð 1¯3 1 Ð

Ð 1¯3 1ï 1¯3 1ï

Ð 2 2 Ð 23 1 Ð 65.5

Ð 23 1ï Ð

Ð 23 1¯ 23 1¯

Ð 2¯ Ð 2¯3 1¯ Ð Ð 72.5

Ð 2¯3 2 Ð

Ð 3 Ð Ð 33 2 Ð 80

Ð 33 2¯ Ð

Ð 4 Ð Ð Ð Ð 92

6 6 Ð Ð Ð Ð 106.5



16 BSI 03-2000

BS 143 & 1256:2000

Table 15 Ð Backnuts P4

Backnuts P4

Fitting size P4 Dimension a (min.)


ï ï 6

® ® 7

¯ ¯ 8

� � 9

1 1 10

1ï 1ï 11

1¯ 1¯ 12

2 2 13

2¯ Ð 16

3 Ð 19



BSI 03-2000 17

BS 143 & 1256:2000

Table 16 Ð Caps T1; plain plugs T8; beaded plugs T9; countersunk plugs T11;alternative slotted head plugs for sizes 5 and 6

Caps T1 Plain plugs T8 Beaded plugs T9 Countersunk plugs T11 Alternative slotted head plugsfor sizes 5 and 6

Fitting sizes Dimensions (min.)

T1 T8 T9 T11 a b c d

Cat. 1 Cat. 3 Cat. 1 Cat. 2 Cat. 3 Cat. 2 Cat. 1 Cat. 2 Cat. 3 mm mm mm mm

Ð Ð Ð ¡ ¡ Ð Ð Ð Ð Ð 11 Ð Ð

ï ï Ð ï ï ï ï Ð Ð 15 14 22 11

® ® Ð ® ® ® Ð ® ® 17 15 24 11

¯ ¯ Ð ¯ ¯ ¯ Ð ¯ ¯ 19 18 26 15

� � Ð � � � Ð � � 22 20 32 16

1 1 Ð 1 1 1 Ð 1 1 24 23 36 19

1ï 1ï Ð 1ï 1ï 1ï 1ï 1ï Ð 27 29 39 20

1¯ 1¯ Ð 1¯ 1¯ 1¯ 1¯ 1¯ Ð 27 30 41 20

2 2 Ð 2 2 2 2 2 Ð 32 36 48 27

2¯ Ð Ð 2¯ Ð Ð 2¯ 2¯ Ð 35 39 Ð 33

3 Ð Ð 3 Ð Ð Ð Ð Ð 38 44 Ð Ð

4 Ð Ð 4 Ð Ð Ð Ð Ð 45 58 Ð Ð

Ð Ð 5 5 Ð Ð Ð Ð Ð Ð 62 Ð Ð

Ð Ð 6 6 Ð Ð Ð Ð Ð Ð 64 Ð Ð



18 BSI 03-2000

BS 143 & 1256:2000

Table 17 Ð Unions, flat seat U1; unions, taper seat U11; male and female unions, taper seat U12

Unions, flat seat U1 Unions, taper seat U11 Male/female unions, taper seat U12


U1 U11 U12 a b

Category 1 Category 2 Category 3 Category 2 mm mm

Ð ¡ Ð Ð 38 Ð

Ð ï ï Ð 42 Ð

Ð ® ® Ð 45 Ð

¯ ¯ ¯ ¯ 48 66

� � � � 52 72

1 1 1 1 58 80

Ð 1ï 1ï Ð 65 Ð

Ð 1¯ 1¯ Ð 70 Ð

Ð 2 2 Ð 78 Ð

Ð 2¯ Ð Ð 85 Ð

Ð 3 Ð Ð 95 Ð

Ð 4 Ð Ð 110 Ð

NOTE 1 For an explanation of the categories see clause 1.NOTE 2 For dimensions a and b see 7.2.

Table 18 Ð Elbow unions, taper seat UA11; male and female elbow unions, taper seat UA12

Elbow unions, taper seat UA11 Male/female elbow unions, taper seat UA12


UA11(category 2)

UA12(category 2)

amm

bmm

cmm

¯ ¯ 58 76 28

� � 62 82 33

1 1 72 94 38

NOTE 1 For an explanation of the categories see clause 1.NOTE 2 For dimensions a, b and c see 7.2.


BSI 03-2000 19

BS 143 & 1256:2000

Table 19 Ð Gaskets for unions, flat seat U1

Gaskets for unions flat seat U1

Fitting size of union Diameter of gasket (mm)

d D

¯ 21 30

24 34

� 27 38

1 32 44

NOTE 21 mm 3 30 mm gaskets are intended for use with gaskets with union nut threads conforming to BS 2779, size 1, and24 mm 3 34 mm gaskets are intended for use with gaskets with union nut threads conforming to BS 2779, size 1¯.

7 Dimensions and tolerances

7.1 Dimensions of fittings shall conform toTables 3 to 18. If maximum or minimum dimensionsare not specified, the tolerances for face-to-face andface-to-centre dimensions of fittings other thanunions shall conform to Table 20.

WARNING Unions should only be used as completeassemblies. Components of different types, orcomponents of the same type from differentmanufacturers, may not be interchangeable.

NOTE 1 Some fittings have dimensions that are not specified inthis British Standard, and these are outside the scope of thisBritish Standard.

NOTE 2 The face-to-face and face-to-centre dimensions of unionsare not subject to the tolerances specified in Table 20 because ofthe compound effects of component tolerances and design on thefinal assembly.

Table 20 Ð Tolerance on length

Dimensions in millimetres

Length Tolerance

#30 ±1,5

>30# 50 ±2,0

>50# 75 ±2,5

>75# 100 ±3,0

>100# 150 ±3,5

>150# 200 ±4,0

>200 ±5,0

7.2 The minimum depth of spanner flats, measuredat the corners, shall conform to Table 21. Forbacknuts, any chamfering shall not reduce the depthof spanner flat below the minimum dimensions givenin Table 21.

NOTE The dimensions of widths across flats s (see Tables 13to 16) depend on the design of the fittings and may be chosen bythe manufacturer.

Table 21 Ð Minimum depth of spanner flats

Fitting size Min. depth of spanner flatsmm

¡ 4,0

ï 4,0

® 5,0

¯ 5,0

� 5,5

1 6,0

1ï 6,5

1¯ 6,5

2 7,0

2¯ 7,0

3 7,5

4 8,0

5 12,0

6 15,0

8 Threads8.1 Jointing threads

Jointing threads shall conform to Table 22.

8.2 Fastening threads

Threads of union nuts, and mating threads of unionnuts and backnuts, shall conform to BS 2779.

8.3 Alignment of threads

Axes of screw threads of fittings with two or moreoutlets shall be within ±0.58 of the nominal anglebetween each outlet.

8.4 Chamfering of threads

8.4.1 Outlets of fittings shall be chamfered.

8.4.2 On internal threads, the chamfer shall have anincluded angle of 908 and the diameter of thechamfer at the face of the fitting shall exceed themajor diameter of the thread at the face.


20 BSI 03-2000

BS 143 & 1256:2000

Table 22 Ð Jointing threads

Basic design External thread Internal thread

BS 143 Taper (R) to BS 21 orANSI/ASME B1.20.1 (NPT)a

Taper (Rc) to BS 21 orANSI/ASME B1.20.1 (NPT)a

BS 1256 Taper (R) to BS 21 Parallel (Rp) to BS 21a American National Standards Institute/American Society of Mechanical Engineers.

NOTE The type of jointing thread should be specified in accordance with annex B. If the purchaser does not specify the type ofthread then the manufacturer should supply fittings with jointing threads conforming to BS 21.

Figure 2 Ð Temperature/pressure ratings

8.4.3 On external threads, the chamfer shall have aminimum included angle of 608 and the diameter ofthe chamfer at the face of the fitting shall not exceedthe minor diameter of the thread at the face.

9 ManufactureFittings shall not contain any material detrimental tousage. Fittings shall be smooth and free from sand,blow holes, cracks, and other injurious defects.Fittings shall not be impregnated to cover suchdefects.

10 Characteristics10.1 Permissible working pressure andtemperature

Fittings of all sizes shall be suitable for themaximum permissible working pressures within thetemperature ranges given in Table 23 (see alsoFigure 2). Intermediate pressure ratings attemperatures between 120 8C and 300 8C shall bedetermined by linear interpolation. For normalapplications the lowest service temperature forfittings shall be220 8C.NOTE 1 For use of malleable iron fittings in special applicationsbelow 220 8C, the manufacturer should be consulted.

NOTE 2 Cast copper alloy fittings can be used at temperaturesbelow 220 8C, but consideration should be given to any applicablecodes and the suitability of the connecting pipe material, thethreaded joint, and any thread sealants.

Table 23 Ð Temperature/pressure ratings

Material Servicetemperature

8C

Maximum permissibleworking pressure

bara

Malleable cast iron 220 to 120300

2520

Cast copper alloy 220 to 120300

1610

a 1 bar = 105 N/m2 = 100 kPa.

10.2 Design strength

Pressure-containing fittings, including the componentparts of unions, shall be designed to withstand thedesign test pressures specified in Table 24. Each sizeof fitting shall be type tested at the design testpressures specified in Table 24.

NOTE Leakage may be permitted from a union joint at apressure below the pressure given in Table 24 provided that thepressure is not less than 1,5 3 maximum permissible workingpressure at ambient temperature (see 10.1).

Table 24 Ð Design test pressures

Material Hydrostatic design test pressure(gauge)

Sizes ¡ to 4bar

Sizes 5 and 6bar

Malleable cast iron 100 64

Cast copper alloy 64 Ð


BSI 03-2000 21

BS 143 & 1256:2000

11 AssemblyFittings shall be able to withstand normal forcesapplied during assembly when correctly assembledwith elements with threads conforming to clause 8.

12 Testing and inspection

12.1 Material

The manufacturer shall ensure by testing that thematerial conforms to the grade specified in 5.1.

For malleable iron fittings, in addition to carryingout the tests described in BS EN 1562, themanufacturer shall conduct appropriate tests, afterannealing and before machining, to ensure that allfittings are satisfactorily malleabilized.

12.2 Hot dip zinc coating

Hot dip zinc coating (if required) shall conformto 5.3.

The elements specified in 5.2.2 shall be determinedusing a recognized test method (e.g. atomicabsorption spectroscopy). The coating mass persurface unit area shall be determined (e.g. inaccordance with BS EN ISO 1460).

NOTE 1 The thickness of the coating may be checked by usingcalibrated electronic or magnetic instruments or by microscopicexamination.

The measuring result of a fitting shall be calculatedas the arithmetic mean of at least 10 individualmeasurements at points distributed across the fitting.

NOTE 2 BS EN ISO 2178 provides a suitable method fordetermination of coating thickness.

Samples of hot dip zinc coated fittings shall beselected, in accordance with the manufacturer'ssampling procedure, and visually inspected forcompactness and continuity of the zinc coating.

NOTE 3 Some suitable sampling procedures are given in BS 6001.

12.3 Gauging of threads

12.3.1 Jointing threads

Jointing threads shall be gauged in accordance withsystem A or B of BS 21:1985, except that for internalthreads the theoretical location of the gauge planeshall be at the position where the chamfer intersectsthe major thread diameter. American pipe threadsshall be gauged in accordance withANSI/ASME B1.20.1 (NPT).

12.3.2 Fastening threads

Fastening threads shall be gauged to ensure thatthread diameters conform to BS 2779.

12.4 Alignment of threads

Axes of screw threads shall conform to 8.3.

12.5 Leak tightness test

All pressure-containing fittings shall be tested aftermachining, but before protective coating other thanwith zinc, by one of the following methods:

Ð by application of an internal hydrostaticpressure of not less than 20 bar; or

Ð by application of an internal pneumaticpressure of not less than 5 bar, with the fittingcompletely immersed in water or light oil; or

Ð by any other method that ensures equivalentleak tightness.

Fittings shall not show signs of leakage.

Fittings that fail the test shall be rejected.

12.6 Final visual inspection

Fittings shall be free from visible casting orthreading defects.

12.7 Polycyclic aromatic hydrocarbonsanalysis

Surfaces shall be analysed for polycyclic aromatichydrocarbons (see 5.3) by gas or thin-layerchromatography or other equivalent method.

12.8 Inspection documents

If requested by the purchaser and agreed with thesupplier, inspection documents conforming toBS EN 10204:1991, 2.1 or 2.2, as appropriate, shall besupplied.

13 Designation of fittings

13.1 Elements of designation

Fittings shall be designated with the following:

a) the type of fitting (see Table 1);

b) the basic design, thread type and material grade(see 6.1 and Table 2);

c) the identification symbol of the fitting(see Table 1);

d) the fitting size (see 6.2 and 12.2 and Tables 3to 19);

e) surface condition, for malleable iron fittings[either black (symbol Fe) or hot dip zinc coated(symbol Zn); see 5.2].

NOTE The basic designation should be supplemented by thepurchaser with additional information as given in annex B.


22 BSI 03-2000

BS 143 & 1256:2000

Figure 3 Ð Outlets of fittings with more than two outlets

13.2 Additional requirements for designationof fitting size

a) Equal fittings

Equal fittings with all outlets the same size shallbe specified by the one size, irrespective of thenumber of outlets.

b) Unequal fittings

Unequal fittings shall be specified by the sizes ofeach outlet. The sequence shall depend on thenumber of outlets as follows:

1) Unequal fittings with two outlets shall bespecified by the outlets in decreasing order.

2) Tees B1 and E1 with equal outlets on the runand an increasing or reducing outlet on thebranch shall be specified by the size of the runfollowed by the size of the branch.

3) Tees B1 and E1, reducing on the run, or withthree different outlets, shall be specified byeither a) or b), as shown in Figure 3.

NOTE Method b) should be phased out during 2000. After this,all fittings should be designated by method a).

14 MarkingFittings shall be marked, by casting, with at least thefollowing:

a) the manufacturer's name or trademark;

b) the fitting size (as defined in 4.4).

The fitting size marking shall be the same as thedesignation of fitting size (as specified in 13.2), or,alternatively, the fitting shall be marked with thethread size designation at each outlet.

Other markings shall not conflict with the markingsin items a) and b).

NOTE If it is not practicable to mark fittings because of castingmethod space limitations, either or both of a) and b) may beomitted, provided that both markings are given on the packagingmaterial. In this case the fitting shall not be marked with anyother marking.


BS 143 & 1256:2000

BSI 03-2000 23

Annex A (informative)

Relationship between fitting size and nominal size DNThe relationship between the fitting size (designation of thread size), and nominal size (DN) is given in Table A.1.

Table A.1 Ð Relationship between fitting size and nominal size (DN)

Designation of threadsize/fitting size

¡ ï ® ¯ � 1 1ï 1¯ 2 2¯ 3 4 5 6

Nominal size, DN 6 8 10 15 20 25 32 40 50 65 80 100 125 150

Annex B (normative)

Information to be obtained from the purchaserThe following information, that supplements the designation detailed in 12.1, shall be obtained from thepurchaser at the time of enquiry and/or order:

a) the type of thread (see clause 8);

b) the fitting material (see 5.1);

c) the specific design of backnut, plug or union, if design alternatives are permitted (see 6.6 to 6.8);

d) whether an inspection document is required (see 11.8);

e) whether the gasket could come into contact with potable water, and so whether a particular type of gasketmaterial is required for unions, type U1 (see Table 19).

Annex C (normative)

Effect of non-metallic materials on water qualityWhen used under conditions for which they are designed, non-metallic materials that could come in contact withpotable water shall not constitute a toxic hazard, shall not support microbial growth, and shall not produceunpleasant tastes or odours, cloudiness, or discoloration of the water.

Concentrations of substances, chemicals and biological agents leached from materials in contact with potablewater, and measurements of the relevant organoleptic/physical parameters, shall not exceed the maximum valuesrecommended by the World Health Organization in its publication Guidelines for drinking water quality,Vol. 1: Recommendations (WHO, Geneva 1984), or as required by the EEC Council Directiveof 15 July 1980 relating to the quality of water intended for human consumption (Official Journal of theEuropean Communities L229, 11-29), whichever in each case is the more stringent.

NOTE 1 Requirements for testing the effects of non-metallic materials on water quality are set out in the UK Water Fittings ByelawsScheme Information and Guidance Note 5-01-02, ISSN 0267-0313, obtainable from the Water Research Centre Water Byelaws AdvisoryService, 660 Ajax Avenue, Slough, Berkshire SL1 4BG.

NOTE 2 Pending determination of suitable means to characterize the toxicity of leachates from materials in contact with potable water,materials approved by the Department of the Environment Committee on Chemicals and Materials of Construction for use in PublicWater Supply and Swimming Pools should be considered free from toxic hazard for the purposes of this annex. A list of approvedchemicals and materials is available from the Technical Secretary of that Committee at the Department of the Environment, WaterDivision, Romney House, 43 Marsham Street, London SW1P 3PY.

NOTE 3 Products manufactured for installation and use in the United Kingdom that are verified and listed under the UK Water FittingsByelaws Scheme administered by the Water Research Centre Water Byelaws Advisory Service, 660 Ajax Avenue, Slough,Berkshire SL1 4BG are deemed to conform to this British Standard.


24 BSI 03-2000

BS 143 & 1256:2000

Bibliography

BS 6001 (all parts), Sampling procedures for inspection by attributes.

ISO 7-1:1995, Pipe threads where pressure tight joints are made on the threads Ð Part 1: Designation,dimensions and tolerances.

BS EN ISO 1460:1995, Metallic coatings Ð hop dip galvanized coatings on ferrous materials Ð Gravimetricdetermination of the mass per unit area.

BS EN ISO 2178:1995, Non-magnetic coatings on magnetic substrates Ð Measurement of coating thickness ÐMagnetic method.

BS EN 10242:1995, Threaded pipe fittings in malleable cast iron.

ISO 49:1994, Malleable cast iron threaded to ISO 7-1.


BS 143 & 1256:2000

BSI389 Chiswick High RoadLondonW4 4AL

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BS 143 & 1256: 2000

Documents

Transcript of BS 143 & 1256: 2000