IS 1239 ( Part 2 ) : 1932
SPECIFICATION FOR MILD STEEL TUBES, TUBULARS AND’OTHER WROUGHT
STEEL FlTTiNGS PART 2 MILD STEEL SOCKETS TUBULAR AND OTHER WROUGHT
STEEL PIPE FITTINGS
( Fourth Revisiolz ) First Keprin! !ULY 1992
UDC 62i,643.41-034.141-24
@ IXS 1992
BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
Price Group IL
Steel Tubes, Pipes and Fittings Sectional Committee, MTD 19
FOREWORD
This Indian Standard (Part 2) (Fourth Revision) wasadopted by the Bureau of Indian Standards, after the draft finalized by the Steel Tubes, Pipes and Fittings Sectional Committee had been approved by the Metallurgical Engineering Division Council.
This standard was first issued in 1969. After reviewing the standard, the committee responsible for preparation of the standard, had prepared a revision incorporating the following major changes:
a) The scope has been modilied to cover the requirements of back nuts given in IS 3468 : 1975 ‘Specification for pipe nuts (firsf revi$ion)‘. In Table 3, requirements of back nuts have been deleted since these are covered in the relevant standard.
b) A tlew_clause has been added to permit the manufacturer to-make plain-end fittings without screwing.
c) Table 27 has been modified to cover both male taper thread size ( external ) and female parallel thrcnd size ( internal ).
d) Expansion test and other requirements have been included for sockets on the basis of IS 1239 (Part 1 ) : 1990 ‘Mild steel tubes, tubulars and other wrought steel fittings - Specification : Part I Mild steel tubes ($./I revisio,r )‘, to make the requirements for sockets complete.
c) Amendments No. I and 2 issued to the standard have been incorporated. Mallcnble cast iron pipe fittings are covered by IS 1879 : I987 ‘Specification for malleable cast iron pipe fittings ( secorld revisiojr )‘. The nominal bores specified in the standard and the corresponding nominal sizes of pipe threads according to IS 554 : 1985 ‘Dimensions for pipe threads where pressure tight joints are required on the threads ( third revision )’ are given in Annex B for information. The standard keeps in view the manufacturing and trade practice followed m the country in this field. In preparing this standard assistance has been derived from the following publications:
BS 1387 : 1967 Specification for steel tubes and tubulars (suitable for screwing to B. S. 21 Pipe threads ), issued by the British Standards Institution ( BSI ).
BS 1740 : 1965 Specification for wrought pipe fitting, iron and steel ( screwed B. S. P. thread ), issued by the British Standards Institution ( BSI ).
For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS 2 : 1960 ‘Rules fdr rounding off numerical values (revised )‘. The number of significant places retained in the rounded off value should be same as that of the specified value in this standard.
IS 1239 ( Fart 2 ) : 1992
Indian Standard SPECIFICATION FOR MILD STEEL TUBES,
TUBULARS AND OTHER WROUGHT STEEL FITTINGS
PART 2 MILD STEEL SOCKETS TUBULAR AND OTHER WROUGHT STEEL PIPE FITTINGS
( Fourth I SCOPE 1.1 This standard (&art 2) covers the requirements for butt welded and seamless, nlain ended, screwed and socketed mild steel
Mars and other welded and seamless wrought .!ci pipe fittings. The requirements of back
nuts are covered in IS 3468 : 1975.
2 REFERENCES 2.: The Indian Sta.ndarCs listed in Annex A arc necessary adjuncts to this standard.
3 TERMINOLOGY
3.0 For the purpose of this standard, the following definitions shall apply.
3.1 Fittings --- Term used to denote fittings like elbows, tee, cross, etc.
3.2 Socket - The screwed coupling utilized in jointing the tubes together.
NOTE - The ter;n wxke:’ is synonymous with the term xwupjiog’.
3.3 Tube ( Pipe ) - Along, hollow, open-ended object circular or other cross-section. The
yms tube and pipe are often used Aonymously.
3.4 Tubular - A term used to include pieces, long-screws. bends springs, return bends and barrel nipples.
4 ~BIONATION
4.1 Mild steel sockets and tubular covered by this standard shall be designated by their nominal bore. 4.2 Other wrought steel fittings shall be designated giving the following particulars in the sequence shown:
a) Type of fittings ( see 4.2.1 ). and b) Size designation ( see 4.2.2 )
Revision ) 4.2.1 Type of Fittings
The types of fittings are denoted as elbow, tee, cross, etc. 4.2.2 Size Designation
This is determined by the nominal bore in millimetres of the pipe at the.outlets.
4.2.2.1 Equalfittings
Where all out& in a give” fitting are of the same size. the fitting shall be’ referred to by that one size. irrespective of the number of the outlets.
4.2.2.2 Unequai/Fttings
These are referred to by the size of each outlet.
5 SUPPLY OF MATERIAL
5.1 C+Jeneral requirements relating to the supply of mild steel tubulars and other fittings shall conform to IS 1387 : 1961.
qMANUFACTURE
6.1 Tubulars conforming to this standard shall be made from tubes which comply with all the ;;frpriate requirements of IS I239 ( Part 1 ) :
6.2 Sockets
Sockets shall be tianufactured from mild. stee! by any of the following pocesses:
a) Hot-finished seamless ( HFS ), b) Electric resistance welded ( ERW 1. c) High frequency induction welded
( HFIW ), and d) Hot-finished welded ( HFW ).
NO? - Hand welding of sockets may be permitted prowded the test requirements for the sockets covered by this standard are complied with.
IS 1239 ( Part 2 ) : 1992
6.2.1 All ,sockets shall be either welded or seamless as agreed to between the purchaser and the manufacturer.
6.2.2 All elctric welded sockets ( medium and heavy class ) used for steam services shall be normalized.
6.3 Other Fittings
Other wrought steel pipe fittings shall be manu- factured from mild steel by any approved process.
6.3.1 Unless otherwise specified by the purcha- ser. all fittings shall he manufactured with thread .connections, complying with the requirements of IS 554 : 1985. At the request of the purchaser, the manufacturer is permitted to make plain.cnd fittings without screwing as per the dimensions given in the relevant Tables.
6.4 The steel from which the fittings are made, when tested in accordance with IS 1894 : 1972 shall show on test a minimum tensile strength of 320 MPa. The percentage elongation on a gauge length of 5.65 ,/z ( where S, is the original cross section of the test specimen ) shall not be less than 9 500 divided by the tensile strength of the specimen.
7 CHEMICAL COMPOSITION
7.1 The ladle analysis of steel shall not show sulphur and phosphorus in amounts exceeding 0.06 percent each.
7.1.1 The ladle analysis of steel shall be carried out either by the method specified in IS 228 or any other established instrumented/chemical method. In case of dispute the procedure given in IS 228 and its relevant parts shall be refuel method. However, the method is not given in IS 228 and its relevant parts, the refuel method shall be asreed to between the purchaser and the manufacturer. 7.1.2 Product Analysis
The maximum permissible variation of sulphur and phosphorus, in case of product analysis from the limits specified under 7.1 shall be 0,005 percent each.
NOTE-The product analysis is not applicable to rimming quality steel.
8 DIMENSIONS OF TUBULARS
8.1 Pieces
Pieces shall conform to the dimensions given in Table I.
8.2 Nipples
Close taper and running nipples shall be mad‘ only from heavy tubes. Barrel nipples shall b; made either from medium or heavy tubes. Th. ;zb;:s;pns of nipples shall be as given i:
8.3 Loogscrews ( Connectors )
8.3.1 Longscrews ( connectors ) shall be mad Only from heavy tube and shall be supplie. single or double, as may be specified,, and sha conform to the appropriate dimensions give, in Table 3.
8.3.2 The sockets shall be suitably faced o the end which the back nut abuts. The face <, the back but which abuts against the socke: shall be concave at an-angle of approximate: 15”.
8.3.3 The parallel threads on the longscre and in the socket shall: in addition complying with the approprtate requirement IS 554 : 1985, be of such a size that the sock, runs on the connector hand-tight witho:, perceptible shake.
NOTE- When it is necessary to use longscrew ! running joints. the threads of the longscrew wh: accommodates. the running socket and back : shall be parallel. This type of joints is pcm,issible for 1o:v press!; but is no1 rccomm:ndcd for higher pr~ss~rcs or work in which tbcre are wide vxriations temperalure.
8.4 Bends and Springs
8.4.1 Bends and springs shall conform to .; appropriate dimensions given in Table 4. tolerance of kl.5” on the specified angle st be permitted.
8.4.2 Type IA bends shall be made only fr heavy tubes, and in addition to conforming the appropriate dimensions given in Table shall be fitted with sockets and back ,:‘ conforming to the requirements given in 8.3.
8.4.3 Each bend and spring shall be supp! with one socket. if so specified by purchaser.
8.5 Return Bends
8.5.1 Return bends shall be made from he: tube, supplied with socket at one end if specified by the purchaser, and shall conf<. to the dimensions given in Table 5. The end< the bends shall be parallel within 11.5”.
2
IS 1239(Psit2):1992
Table 2 Dimensions of Running Nipples; Close Taper Nipples sad Barrel Nipples
( Chuse 8.2’)
Nominal Bore
(1) 6 1; 15 2
32) 40 50)
125 I50
All dimensions in millimetres.
Running Close Taper Nipple
(Parallel Nipple ( Taper threads both
threads ) ends)
Barrel Nipple (Taper threads
both ends )
c---
Running Nipple ---
Minimum Tolerance (2) (3)
Clore~pplc r---*-
Minimum Tolerant (4) (5)
-
Barrel Nipple c-m
Minimum Tolerance (6) (7) 1;
7.1 1 :‘: 32‘1 +3
28 + I.5 1 +I.5
::I
21 :; 2:: +4.5 @JJ
4
IS 1239 ( Part 2 ) : 1992
Table 3 Dimensions of Longs~rews
( Chse 8.3. I )
All dimensions in millimetres.
PARALLEL PIPE
NOTE-For particulars of back nuts, see IS 3468 : 1975.
l Double longscrew are not supplied in these lengths.
Is1239 (Part 2)‘: I992
Table 4 Dimensions of Bends and Springs ( Clause 8.4.1 )
All dimcnsioris in miilimctrca.
TYPE 1A
*--- -- 0 ’ -L- z- 4 w .‘, , /‘/ ’ /’ 135O
I’ =i
TYPE 3
<-..&g?@ TYPE 4 \
Bends 90”, Approximate Approximata Centre to Face RaditW
Approximate Centre to Face for springs
7-----, Tiii;------ . 0 135" 157.5' B R C D
0 (3) (4) (-7 (6) l
2-i 73 73 1%
2 48 5*: Iti 48 2 64 60
1:; 127 143 :: 2 76 89 i i 121 168 a9 108 10s 102 fZ 197
203 %
108 127 133 149 127 143 124
159 181 175 :ii 248 321 197 722 213 292 371 381 467
Ei 'Z .%f ;2 318
iii 718 632 - - 4i6 437 444 572 540 527
6
Table 5 Dimensions of Return Bends
( Clause 8.5. I )
All dimcnrions in millimetres.
(1)
6 8
10
A
(2)
44
51 64
R
(3)
51 64 70
15 89 102 20 102 121 25 114 140
32 127 152 40 165 178 50 190 210
65 305 292
80 356 330 loo 457 400
125 762 578 150 914 692
IS 1139 ( Part 2 ) : 1992
Table 6 Dimensions of Mild Steel Sockets
( Clause 8.6 )
All dimensions itt millimetres.
Nominal Bore Minimum Outside Mlaimum Length Diameter
A B
(0 (2) 0)
6 I5 I9 8 18.5 27
IO 22 28
I5 27 37 20 32.5 39 25 39.5 46
32 49 51 40 56 51 50 68 60
65 84 69 80 98 15
100 124 87
125 IS! 96
I50 178 96
i
IS 1239 ( Part 2 ) : 1992
Tabk 7 Dimensions of Screwed Ends of Fittings
( Clause 9.1 )
All dimensions in millimctres.
Nominal Sire Of Outlet
(1)
D
(2)
Minimum Outside Diameter of Body p$e External
E
(3)
Maximum Inside Diruneter of Body Bebird Internal
Thread n
(4)
6 IS 9.8 8.6 8 18.5 13.3 11.4
10 22 16.8 11.0 I.5 27 21.1 18.6 20 32.5 26.6 24.1
'25 39.5 33.4 30.3
32 49 42.1 39.0 40 56 48.0 44.8
SO 68 59.8 56.7
65 84 75.4 72.2
80 98 88.1 84.9 100 24 113.3 110.1
125 51 138.7 135s
150 78 164.1 160.9
Minimum Outside DIaWetCr
NOTB - For particular of threads. see IS 554 : 1985.
IS 1239 ( Part 2 )‘: 1992
Table 8 Dimensions of Elbows, Tees and Crosses, Equal
( Chuse 9.1 )
All dimensions in milliietrcs.
ELBOW, EQUAL TEE, EOUAL
Nominal Size of Outlet
(1)
6
R
10
IS
20
25
32
40
SO
65
80
100
12s
150
CROSS. EQUAL
Minimum Length, Ceiltre to Face
(2)
16
22
24
32
35
43
51
52
64
76
89
115
140
160
9
IS 1239 ( Part 2 ) : 1992
Table 9 Dimensions of Elbows, ~edociag
( Chse 9. I )
Et8OW, REDUCING
Midmum Length, Cenlre to Face
A (2)
~~XTCUll mm mm
8X6 21 10 x 6 21 :4” 10 x 8 22 24 IS x 8 25 I5 x 10
32 27 32
20 x 8 24 35 20 x IO 29 35 20 x IS 32 35 2s x IO 32 25 x 15
43 35 43
25 x 20 32 x IS :i
43
32 x 20 51
41 32 x 2S
Sl 44
40 x IS 51
38 40 x 20 52 41 40 x 25 $2 44 40 x 32 52
50 x IS 2 52
50x20 64 44 50 x 25 64 48 M x 32 64 52 64
50x40 56 62 x 40
64 60
65 x 50 76
67 80 x 25
76 60
80 x SO 89
73 100x50
89 83
100 x 80 115
95 115
10
IS 1239 (Part 2 ) : 1992
Table 10 Dimensions of Tees, Reducing ( on the Branch )
( Cfouse 9. I )
MinimumLength, Minimum Length. Centre to Face Centre to Face
A (2)
INIl
0x6 10x6 10x8 15x8 15X10
21
21
22
25
21
20x8 21
20X10 29
20x IS 32
25x10 30
25x8 32
25x1s -35
2.5x20 38
32x10 35
32x IS 38
32x20 41
32x25 44
40x 10 37
40x15 38
40x20 41
40x25 48
40x32
50X15
50x20
50x25
50x32
49
41
44
48 52
k--A--&-A--i TEE;REDUCING(on the brarrh)
B (3)
mm
22
24
24
32
32
35
35
35
43
43
43
43
51 51 51
51 52
52
52
52
52
64
64
64
64
Nominat
%I,,3
Minlmiuri Length, Centre to Face
Mlnlmum Length, Centre to Face
(1) (1)X(Z)
mmx mm
A (2)
B (3)
mm mm
50X40 56 64 65x25 54 76
65x32 57 76
65x40 64 76
65X50 61 76
80x25 60
80x32 64
80X40 67
80x50 13
80x65 19
IWx2.5 70
lcOX40 16
loOX 83
100X80 95
105x80 IIS
125x100 130 150x 80 120 ISOXICO 135
89
89
89
89
89
1 IS 115
115 11s
140
140 160 160
11
IS I239 ( Part 2 ) : 1992
Table 11 Dimensions of Tees, Reducing ( on the Run and Bianch, or on the Run Only )
( c/mse 9.1 )
TEE.REDUClNG ON THE RUN AN0 BRANCH
TEE,REOKING ON THE RUN ONLY
Nominal Sire of Outlet
(1) (‘1 x (2) x (3) mmxmmxmm
20 x I5 x I5 20x 15x20 25 x 20 x I5 2s x 20 x 20 25 x 20 x 25
32 x 25 x 20 32 x 2S x 25 32 x 25 x 32 32 x 25 x 40
40 x 32 x 25 40 x 32 x 32 40 x 32 x 40 40 x 32 x 50 so x 32 x 50
50 x 40 x 25 50 x 40 x 40 50 x 40 x 50 50 x 50 x 50 50 x 50 x 65
80 x 50 x 50 80 x 50 x 89
100 x 80 x 80
Minimum Length, Minimum Length,
Cen’reAto Faca cen’re: Face
(2) (3)
mm mm
32 35 35 35 35 43 38 43 43 43
41 51 44 51 51 51 52 52
44 49 52
:
52 52 52 64 64
48 64 56 64 64 64 67 76 16 76
73 89 89 89
95 115
IS 1239 ( Part 2 ) : 1992
Table I2 Dimensions of Tees (Increasing on the Branch )
( c/ausf? 9.1 )
Table 13 Dimensions of Crosses, Reducing
( Chuse 9.1 )
i Nomioal Size of Outlot
(1)
,(‘I x (2) mmXrn”l
6x8
8 x IO
IO x IS
IS x 20
IS x 25
20 x 25
25 x 32
25 x 40
32 x 40
40 x 50
50 x 65
50 x 80
65 x 80
80 x IO0
Minimum Length, Minimum Length. Centreto Face Centre to Face
A B
(2) (3)
mm
22
24
32
35
43
43
51
52
52
64
76
a9
89
II5
21
22
27
32
35
38
44
44
49
56
67
73
79
95
Nominal Size of OUtlCt
0) (‘)X(2)
mm xmm
Minimum Length, Centre to Face
Minimum Length. Centreto Fscf
A B (2) (3)
mm mm
8x6 21 22 10x8 22 24 ISXIO 27 32 20X15 32 35 25x15 35 43
25x20 38 43 32x15 38 51 32x25 44 51 40x15 38 52 40x25 44 52
50x25 48 64 50X40 56 64 65x50 67 76 80X40 67 a9 80x50 13 a9
lOOx 83 100x80 95 125xlW 115 l25xloo I30 150x80 120
l5oxlOO 135
115 115 140 146 160
160
CROSS,?bJCING
13
IS I239 ( Fart 2 ) : 1992
Table 14 Elbows, Tees and Crosses, Side Outlet, Equal
( Clause 9. I )
All dimensions ir millimctrer.
I- A & + -
ELBOW, SIOE OUTLET, EQUAL TEE, SIDE OUTLET,EQUAL CROSS, SIDE OUTLET, EQUA!
Kominal Si72 of Outlet
(1)
I5
2n
25
32
40
50
hlinimom Length, Centre to Face for All Outlets
A
(2)
32
35
43
51
52
64
14
IS 1239 ( Part 2 ) : 1992
Table 15 Dimensions of Elbows, Round, Malt and Female, Equal
( Clause 9. I )
(1)
8
10
IS
20
25
32
40
50
65
80
loo
All dimensions in olillimetres.
ELBOW. MALE 6 FEMAKEOWI
A B
(2) (3) (4)
19 27 6.5
21 29 6.J
25 35 11.5
30 40 IS
37 46 24
43 54 30
49 57 31
59 70 48
68 83 62
81 94 75
loo 115 91
Maximum Born of Male End
(5)
8 IO.5
13
21
26
32
39
51
6.5 79
I04
rs 1239 ( Part 2 ) : 1992
Table 16 Dimensions of Elbows, Equal, 135’
( Clause 9.1 )
Table 17 Dimensions of Y-Pieces, Female, Equal
( Clauause 9. I )
All dimensions in millimetrcs.
(1)
6
8
10
IS
20
2s 33
32 38
40 44
SO 51
65 60
80 73
lea 105
All dimcnrioos in millimctrcr
Y-PIECE, EOUAL
Xominal Sire of O”tkt
(‘1
I5
20
25
32
40
SO
65
80
loo
Minimum Length, Centro lo Face
A
(2)
27
35
36
‘I4
49
57
71
79
ml
16
./I
I...
I,
1.c
C~.:
.,:. ,::::~;.!>*:,l,,\ :!I I! 1,111 n,c,rr\
-. fi - &+-. a . . . ..r.
‘:Li :,;: CAP, 3m.G
IS 1239 ( Part 2 ) : 1992
Table 20 Dimensions of Plug
( clause 9.1 )
L
('1 0)
6 6.5
8 9.7 10 IO.1
IS 13.2
W 14.5
15 16.8
32 19.1
40 19.1
2.0 13.4
6s 26.7
80 29.8
100 35.8
125 40.1
I.54 40.1
All dimensions in mtllimetres.
PLUG
Approx Size Approx Height of squm or squoce
s (3)
6
9 II
13
14
17 12 22 4
21 16 31 5
27 16 33 5
32 19 48 5
37 19 62 6
37 22 73 8 46 25 97 10
51 29 120 12
60 32 145 12
H
(4)
6
6 10
10
12
D
0)
. . .
. . .
. . .
. . .
. .
Mlnlmum Thickness of Metal
K
(6)
. . .
. . .
. . .
. . .
. . .
(7)
22
28
23
22
24
2%
2i
2%
3f 4
4
4i 5
5
NOT’S - Plugs of Nominal sizes 25 to 154 mm may he either solid or hollow. and the attention of the purchaser ia drawn tn the rmc.ssar~ of stating in his enquiry and order which pattern is required.
18
IS 1239 (Part 2 ) : 1992
Table 21 Dimensions of Elbows, Tees and Crosses, Male, Equal
( blouse 9.1 )
All dimensions in miliimeirec.
r------+--A4
I------ ? i7 i
CROSS, MALE, EWAI,
100 180
12s 200 150 230
NOTE - Made from heavy tube conforming 10 IS 1239 ( Part I ) : ,990.
19
1239 ( Part 2 ) : 1992
Table 22 Dimensions of Y-Pieces and Angle Tees, Male, Equal
( Chose 9.1 )
All dimcorions in millimctrcs.
Y PIECE YALE EOWL ANGLE TEE,MALE, EQUAL
Nominal Sire of OUIM
(‘1
Mlnim,tm Length. Cenlre to Face
Minimum Length, cenwe Of FBW
A B (2) (3)
15 120 51
20 130 64
25 150 70
32 160 73
40 170 76
SO 190 83
65 200 90
80 220 loo
100 264 110
125 300 115
150 340 125
NOTE - Made from heavy tube conformins to IS 1239 ( Part 1 ) : 1990.
20
IS 1239 ( Part 2 ) : 1992
Table 23 Dimensions of Twin Elbows and Sweep Tees, Male, Equal
( Chse 9.1 )
All dimensions in miilimctres.
SWEEP TEE,htALE,ECUAC TWIN ELBOW. MALE, EOUAl
Nom;dh of
(1)
15
20
25
32
40
H)
65
80
100
125
150
Mhlmum Length, CeLlire lo Face
A B
(2) (4
80 85
90 90
120 100
IM 10s
170 110
UK, 125
250 135
290 145
380 170
530 195
620 220
NOTE _ Made from heavy tube conforming to IS 1239 (Part I ) : 1990.
21
1239 ( Part 2 ) : 1992
Table 24 Dimensions of Socket Unions Table 25 Dimensions of Pipe Unions
( Clau.w 9. I ) ( Clause 9. I )
All dimensions in millimctrer. All dimensions in millimctres.
@q pgq
A --A
SOCKET UNION PIPE UNION
0)
6 8
10
I5 20
25 32
40
SO
65
80
100 125
I.50
6
8
IO
1s
20
Mnimum Length A (2)
9s
100
110
115 I20
25 125
32 13s
40 140
50 IS0
65 I65
80 180
loo 205
125 215
IS0 230
NOTES NOTE- Unions are normally supplied with flat seats and fitted with a washer. Other types Of scatjog are obtainable, if required.
I Bodies made from heavy tube conforming 10 IS 1239 ( Part I ) : 1990. 2 Uniorc arc normally supplied with flat seats and filled .h a washer. Other types of seating arc obtainable, if required.
22
IS’1239 ( Part 2 ) : 1992
Table 26 Dimensions of Unions Bends
( Clause 9.1 )
All dimensions in millimetrer.
VNION BEND VNION BEND
Nominal Size Of Ootlet
(1)
Minimum Length, Centre to Face
A Q
6 54
8 64
10 73
IS 83
20 100
Mlnlmum Length, Centre to Face
B
(3)
100
II5
12s
140
160
25 120 185
32 I54 220
40 170 240
50 20s 280
65 245 330
80 290 380
NOTES I Bodies made from heavy tube conformin& to IS 1239 ( Part I ) : 1990. 2 Unions are normally supplied with flat seats and fitted with a washor. Other types of stating are obtainable, if required.
23
IS 1239 (Pnrt2):1!392
Table 27 Dimensions of Hexagon Bushes
( Chse 9. I )
All dimensions in miltimetrcs.
Nominal Size cv--H-..AA-~ External Internal Threads Threads
(1) (2) 8 6
10 8 I5 8
IO IO
20 I5 2s I5
20 32 I5
20 25
40 20 25 32
50 25 32 40
65 32 40 50
80 40 50 65
100 50 65 80
IX 80 loo
150 80 100
Len&!lh or USCIUI Tlxfda for Basic Gauge Lengths Plm Clearsnce
L (Mi”) (3) 12.5 12.5 17.5 17.5 19 19 21 21 24 24 24 14 24 24 27 21 27 32 32 32 35 35 35 40 40 40 45 45 45 45
Thickness or
Hexagon T (Md
Minimum OVCdl Lengths A (Ah)
(4) (5) (6) 6 18.5 15.5 1 20.5 Il.9 8 25.5 23.0 1 25.5 23.0
10 29 27.8 IO 29 27.8 10 31 35.3 IO 31 35.3 II 35 47.2 II 35 47.2 II 35 41.2 13 37 52.0 I3 31 52.0 13 31 52.0 I4 41 61.1 14 41 61.1 I4 41 61.1 I6 48 79 I6 48 79 16 48 79 19 54 92 I9 54 92 19 54 92 22 62 117 17. 60 117 22 62 117 25 70 143 25 70 I43 25 70 168 25 70 168
NOTE- External and internal threads shall be made as per IS 554 : 1985.
24
IS 1239 ( Part 2 ) : 1992
Table 28 Dinmhms of Nipples, Hexagon, Equal
( Chuse 9.1 )
Nominal Size
(1)
Minimum Length of Thread for Bask Gauge Length Plus
Dh Ctcnrance L
(2)
l%ieknws Minimum Of OVCAI
HLX%pl Length
T A (3) (4)
6 25 6 31
8 33
8 43
IO 48
C (5)
B (6)
6 8
IO
I5
20
9.5 !2.5
12.5
17.5
19
5.5 13.1 6.5 15.5
9.5 17.9
12.5 23.0
19 27.8
25 21 20 52 25 35.3
32 24 II 59 32 47.2 40 24 13 61 38 s2.0 50 27 14 68 51 61.1 65 32 16 80 64 79
80 35 19 89 76 92 loo 40 22 102 loo 117 125 45 25 II5 125 143 150 45 2s I15 150 168
All dimensions in millimctrcs,
HEJAGON NIPPLE
25
IS 1239 ( Par1 2 ) : 1992
9.2 Tolerances
9.2.1 Where maximum and minimum dimensions are not specified, the tolerance for centre to face and centre to centre dimensions shall be as specified ir: Table 29.
9.2.2 Tolerance for rhe Alig;kmt of Threads The axes of the. threads shall be coincident with the theoretical axes of the fitting within a tolerance of kO.5” on the run and on the branches.
92.3 Thread tolerances shall be in accordance with &xc specified in IS 554.: 1985.
10 JOINTS
10.1 Tubulars and !!ltings jhn!i he screwed with ztpsr or pwallel thrtads O: both as detailed in rablcs. Gnless otherwise specified, sockets for tubulars shall have parallel threads. All threads shall be in accordaocc with IS 554 : 1985.
11 TESTS ON FITTINGS AND SOCKETS
11.1 Ihe fitting aci sockets before i.hey leave the works, shall be subjected to either of the following pressure ‘tests, as ~~~tttall~ agreed between the purchaser and the manufacturer:
a) The application of LX, internal hydraulic pressure of not less than 5 MPa, or
b) The application of an internal air preswre of 0.7 MPa whilst the fittings is completely immersed in water or light oil.
Table 29 Tolerance
( Clam? 9.2.1 )
---------A AbVC “p to and
Including
(‘1 (2) (3) 30 f I.5
30 SO f 2.0 50 75 * 2.5 IS 100 * 3.0
100 175 * 3.5
SOTES 1 Ccntrc to face dimensions apply to elbows. bends, ,ecs, cIosscs. F1C. 2 Face to face dimensions apply to sockets. nipples.
11.1.1 .Thc ends of fttings and sockets when subjected to the required pressure, after having been made up wrench tight with the prior application of lubricant, or sealant, or by any other appropriate method shall not show any leakage. The test shall be carried out after the fittings and sockets have been screwed and before any protecting coating other than galvanizing has been applied.
11.1.2 The sample size and the acce$ancc criteria for the pressure test shall be given in Table 30 below.
11.2 Expaosion Test on Sockets
At the option of the manufacturer any one Of the tesrs described ill I t.2.1 shall be carried out.
11.2.1 Drifr E.r(,a~dh~ Tesr
It shall be carried out on sockets, tubes, blanks OF sockets III accordanae with IS 2335 : 1963. On 3 conical mandrel having 81) included taper on diameter I in 16 and the minimum increase in outside diameter after expansion shall be as follows:
Nominal Bore Prrcefrfage of mm Expansion.
Miu
Up to xnd including 25 2.0
32 to 40 I.5
50 to so !.O
loo to 150 0.5
Table 30 Scale of SampIing and Acceptance Criteria for Pressure Test
(C/ause 11.1.2)
Lot sire Stage S$;le C&ng Accep Reieo I tance tion
W&k “c?- “k2
0) (2) (3) (4) (5) (6) upto Iwo First 13 13 0 2
Saond 13 26 I ?
1001t03wO First 20 20 0 2 Second 20 40 I 9
3001l05ooo First 32 32 0 3 Second 32 64 3 4
5 00, ,o too00 First SO SO 1 4 Second SO ICO 4 5
10 WI and :tbove First 80 80 2 5 Second 80 160 6 7
26
Sockets shall be c:ipable of withstanding the expapsion test as described below without showing any sig” of fracture or failure.
1X.2.2.1 The test shall consist of screwing the selected socket on a taper screw plug.
11.2.2.2 The threads of socket shall be thoroughly clean and free from foreign matter. Should the threads show sign of burr, this shall be removed by means of a pipe thread tap. The threads of the socket and the end of the test plug shall be lubricated with oil. and the socket shall then be screwed on to the test plug between the jaw of a vice, or other suitable fixtures, and by rotating the socket with both hands. The socket shall then be further rotated live complete turns beyo,?d hand tightness, either by means of 8 pope wrench of nn adequate length to operate the test with gradual turning or by :I power machine giving an appropriate leverage. The wrench shall not be hammered ( xc Fig. I ).
11.2.2.3 The plugs shall be manufactured from steel and shall be hardened to give a vickers hardness between 700 and 800 HV when determined by applying a load of 30 kgf in accordanae with IS I501 ( Part I ) : 1984.
11.2.2.4 The dimensions of ph~g shall conform with those given in Table 31. The threads shall be ground after the plu~_s are cast hardened. and the thread fZ>rn, and nnglc of taper shall he in accordance with the appropriate dimensions and tolerances specified in IS 554 : 1985.
IS I239 (Part 2’ ) : 1992
11.2.2.5 For rowine testing, use may be made, if so desired, of unhardened steel plugs in accordance with the dimensions given in Table 31 and having machined threads. the thread form and angle of taper being in accor- dance with the appropriate dimensions and tolerance specilied in IS 554 : 1985.
11.2.2.6 In case of dispute, however in the test shall be carried out with the hardened plugs specilied in 11.2.2.3 and 11.2.2.4.
12 SAMPLING OF TUBULARS, SOCKETS AND FITTINGS
12.1 The procedure for sampling of tubulars, sockets and fittings for various tests shall be given in’rS 471 I : 1974.
12.2 Re-test
Should any one of the test pieces first selected fail to pass any of the tests specified, two further samples shall be selected for testing in respect of each failure. Should the test pieces from both these additional samples pass, the material shall be deerwd to comply with the requirc- menls of the particular test. Should the test pieces from either of these additional samples fail, the material represented by the test samples shall be deemed 3s not complying with the standard.
13 GALVANIZING
13.1 Where tubulnrs, sockets and fitting nre required to be galvanized, the zinc coating shall be in accordance with IS 4736 : 1986.
FIG. 1 MECtiANtCAL EXPANSION TEAT ON S~CKBTS
27
ls1239(Part2):1992
Table 31 Dimensions of Taper Screw Plugs for Expansion Test
( Chses 11.2.2.4 rind 11.2.2.5 )
,PPER PIPE THREADS 7
NOdOd Bare
0) (2) 6 9.728 8 13.157
10 16-552 10 20.955 20 26.441 25 33.249
32 41.910 40 47.803 54 59.614
65 80
loo 12s 150
75.184 87.884
113~OM 138.430 163.830
A C 6
Tlmad.9 Tolerance on Per 25.4 Total Number
mm or lixeads
(3) (4) 28 2 19 2
19 2 14 2 14 2 II 2
II 2 II 2 I1 2
II 2 II 2
II 2 11 2 II 2
,.’ -. \ I \
: ~ t
@
\ \ ,’
‘. ,
--’ D
A B
(5) (6) (7) (8) 1.8 13 II 7 2.8 19 13 10
2.8 19 16 13 3.6 7.5 19 i4 3.6 25 29 17 4.6 32 29 21
4.6 32 32 27 4.6 32 38 32 4.6 32 38 37
4.6 32 51 48 4.6 32 57 54
4.6 32 64 70 4.6 32 67 76 4.6 32 70 89
c D
13.1.1 Tubulars, sockets and fittings shall be 15 MARXING galvanzined before screwing. 14 WORKMANSHIP
15.1 Tubulars, sockets and fittings shall be suitably packed and threads protected from
14.i Tubulars, sockets and fitting shall be damage and marked with the following details: clearly finished and reasonably free from scale, surface flaws, laminations and other defects. a) Manufacturer’s name or trademark, and The screw threads of tubulars, sockets and b) Size designation fittings shall be clean and well cut. The ends shall be cut clearly and square unless otherwise 15.1.1 Tubulars, sockets and fittings may also specified. be marked with the Standard Mark.
28
IS 1239 ( Part 2 ) : 1992
ANNEX A
LIST OF REFERRED INDIAN STANDARDS
ANNEX B
( c/uuse 0.3 )
i\‘O%llNAI, SILE 01; PIPE THREADS ANI> CORRLSI’ONDISG NOMINAI. L1ORkX 01: PIPES
29
AMENDMENT NO. 1 AUGUST 1993 TO
IS 1239 ( Part 2) : 1992 SPECIFICATION FOR MILD STEEL TULIES, TUBULARS AND OTlfER WROUGtfT
STEEL FI’ITlNGS PART2 MILD STEEL SOCKETS TUBULAR AND OTHER
WROUGHT STEEL PIPE Fll-l’lNGS
( Fourth Hevivion )
(MTD I’))
