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俄罗斯套管标准


USSR STATE STANDARD

CASING PIPES AND COUPLINGS FOR THEM SPECIFICATIONS GOST 632-80

Official Edition

USSR STATE STANDARDS COMMITTEE MOSCOW

Group V6

2

USSR STATE STANDARD

CASING PIPES AND COUPLINGS FOR THEM Specifications
OKP 13 2100 Validity Term from 01/01/83 Section on Design A Pipe 01/01/84 till 01/01/93 Non-compliance with the standard is prosecuted by law. This Standard applies to steel seamless pipes with triangular and trapezoidal thread and coupling for them, pipes with supertight joints couplings for them, as well as flush-joint slip-joint pipes with used for operations on oil and gas wells. (Amended, Rev. 4).

1. PIPE GRADES
1.1. This Standard provides for fabrication of pipes in terms of accuracy and quality of two designs (A and B). Pipe grades are shown in Table 1.

Pipe Grades
Table 1 Wall Thickness, mm Nominal Pipe Diameter Triangular Thread Short Long Design А 5,2 5,7 114 6,4 7,4 8,6 10,2 5,6 6,4 D D D D D DELM DELMR DELMRT LMRT DELM DELM DELMR DELMRT LMRT DELM DELMRT LMRT Joint Type

OTTM

OTTG

TBO

127

7,5 9,2 10,2 6,2 7,0

D D D D D D D D DE D D D D D D D -

DELMRT DELMRT DELMRT DELM DELMRT DELMRT DELMRT DELM DELM DELMRT DELMRT DELMRT DE DEL DELMRT DELMRT DELMRT DEL DELMRT DELMRT DELMRT DELMRT ELMRT LMRT DELMRT DELMRT DELMRT

DELMRT DELMRT DELMRT D DELM DELMRT DELMRT DELMRT D D DELM DELMRT DELMRT DELMRT DE DEL DELMRT DELMRT DELMRT D DEL DELMRT DELMRT DELMRT DELMRT ELMRT LMRT D DELMRT DELMRT DELMRT

DELMRT DELMRT DELMRT DELMRT DELMRT DELMRT DELMRT DELMRT DELMRT DELMRT DELMRT DELMRT DELMRT DELMRT ELMRT LMRT DELMRT DELMRT

DELMRT DELMRT DELMRT DELMRT DELMRT DELMRT DELMRT DELMRT DELMRT DELMRT DELMRT DELАЮT DELMRT DELMRT ELMRT LMRT DELMRT DELMRT

140

7,7 9,2 10,5 6,5 7,0

146

7,7 8,5 9,5 10,7 7,3 8,0

168

8,9 10,6 12,1 5,9 6,9 8,1

178

9,2 10,4 11,5 12,7 13,7 15,0 7,6 8,3

194

9,5 10,9

12,7 15,1 6,7 7,7 8,9 219 10,2 11,4 12,7 14,2 7,9 8,9 10,0 11,1 245 12,0 13,8 15,9 7,1 8,9 10,2 273 11,4 12,6 13,8 15,1 16,5 8,5 9,5 299 11,1 12,4 14,8 8,5 9,5 324 11,0 12,4

D D D D D D D D DELM DELMR DELMR DELMRT DELMRT ELMRT LMRT D D DELM DELMRT ELMRT D DEL DELM DELMRT

DELMRT LMRT DELM DELMR DELMRT DELMRT ELMRT DELM DELMR DELMRT DELMRT DELMRT LMRT -

DELMRT LMRT D DELM DELMR DELMRT DELMRT ELMRT D DELM DELMR DELMRT DELMRT DELMRT LMRT DELM DELMR DELMR DELMRT DELMRT ELMRT LMRT D D DELM DELMRT ELMRT DEL DELM DELMRT

DELMRT LMRT DELM DELMR DELMRT DELMRT ELMRT DELM DELMR DELMRT DELMRT DELMRT LMRT DELM DELMR DELMR DELMRT DELMRT ELMRT LMRT -

DELMRT LMRT -

14,0 8,4 9,7 10,9 340 12,2 13,1 14,0 15,4 9,0 351 10,0 11,0 12,0 9,0 377 10,0 11,0 12,0 9,5 406 11,1 12,6 16,7 10,0 426 11,0 12,0 473 11,1 11,1 508 12,7 16,1

DELMRT D DEL DEL DELM DELMRT DELMRT LMRT D DEL DELM DELM D DE DEL DEL D DE DE DE D DE DE D D D D

Design B

DELMRT DEL DEL DELM DELMRT DELMRT LMRT -

-

-

6,4 114 7,4 8,6 6,4

DKE DKE DKELMRT DKE

DKEL DKELMRT -

DKELMR DKELMRT -

DKELMRT -

-

127

7,5 9,2 6,2 7,0

DKEL DKELMRT DKE DKE DKEL DKELMRT DKELMRT DKE DKE DKE DKELMRT DKELMRT DKELMRT DKEL DKE DKELMRT DKELMRT DKELMRT DKE DKEL DKELMRT DKELMRT DKELMRT DKELMRT DKE DKE DKELMRT DKELMRT DKELMRT DKE DKELM DKELMRT

DKEL DKELMRT DKE DKELMRT DKELMRT DKELMRT DKEL DKEL DKELMRT DKELMRT DKELMRT DKEL DKELMRT DKELMRT DKELMRT DKEL DKELMRT DKELMRT DKELMRT DKELMRT DKEL DKELMRT DKELMRT DKELMRT DKELM DKELMRT

DKELMRT DKELMRT DKE DKELMRT DKELMRT DKELMRT DKE DKELMRT DKELMRT DKELMRT DKELMRT DKEL DKELMRT DKELMRT DKELMRT DKEL DKELMRT DKELMRT DKELMRT DKELMRT DKELMRT DKELMRT DKELMRT DKE DKELM DKELMRT

DKELMRT DKELMRT DKELMRT DKELMRT DKELMRT DKELMRT DKELMRT DKELMRT DKELMRT DKELMRT DKELMRT DKELMRT DKELMRT DKELMRT DKELMRT DKELMRT

DKELMRT DKELMRT DKELMRT DKELMRT DKELMRT DKELMRT DKELMRT DKELMRT DKELMRT DKELMRT DKELMRT DKELMRT DKELMRT DKELMRT DKELMRT -

140

7,7 9,2 10,5 6,5 7,0

146

7,7 8,5 9,5 10,7 7,3 8,0

168

8,9 10,6 12,1 6,9 8,1

178

9,2 10,4 11,5 12,7 7,6 8,3

194

9,5 10,9 12,7 7,7 8,9

219

10,2

11,4 12,7 14,2 7,9 8,9 245 10,0 11,1 12,0 13,8 7,1 8,9 273 10,2 11,4 12,6 13,8 8,5 9,5 299 11,1 12,4 14,8 9,5 324 11,0 12,4 14,0 340 8,4 15,4 9,0 351 10,0 11,0 12,0 9,0 377 10,0 11,0

DKELMRT DKELMRT DKELMRT DKE DKELM DKELMRT DKELMRT DKELMRT DKELMRT DKE DKE DKELMRT DKELMRT DKELMRT DKELMRT DKE DKELMRT DKELMRT DKELMRT DKELMRT DKE DKELMRT DKELMRT DKELMRT D LMRT DK DK DK DK DK DK DK

DKELMRT DKELMRT DKELMRT DKELM DKELMRT DKELMRT DKELMRT DKELMRT -

DKELMRT DKELMRT DKELMRT DKE DKELM DKELMRT DKELMRT DKELMRT DKELMRT DKELM DKELMRT DKELMRT DKELMRT DKE DKELM DKELM DKELM DKELM DKELM DKELM LMRT -

DKELMRT DKELMRT DKELMRT DKELMRT DKELMRT DKELMRT DKELMRT DKELMRT DKELMRT DKELMRT -

-

12,0 406 16,7 10,0 426 11,0 12,0 473 508 11,1 12,7 16,1

DK DE DK DK DK DK D D

-

-

-

-

Note: By agreement between the manufacturer and the consumer, pipes may be made with interim and larger values of wall thickness. 1.2. The sizes and mass of pipes and couplings shall be consistent with those specified in Sketch 1 and Table 2 for short triangular thread joints, Sketch 1 and Table 2 for joints with long triangular thread (U), Sketch 2 and Table 4 for joints with trapezoidal thread (OTTM) and Sketch 3 and Table 5 for supertight joints – OTTG. The sizes and mass of flush-joint slip-joint pipes (TBO) shall be as specified in Sketch 4 and Table 6. 1.1, 1.2 (Amended, Rev. 2, 4). 1.3. Design A and B pipes shall be made from 9.5 to 13 m in length. It is permissible to have in a batch of pipe with triangular thread and trapezoidal thread (OTTM): ? ? up to 20% of pipes from 8 to 9.5m in length and no more than 10%of pipes from 5 to 8 m in length if made out of casting workpiece (ingot); up to 10% of pipes from 8 to 9.5 m in length and no more than 5% of pipes from 5 to 8 m in length if made out of a rolled workpiece.

. At customer’s request, it is permissible to change the number of pipes less than 9.5 m long in a batch, as well as to manufacture pipes less than 5 m in length. Pipes with supertight joints (OTTG) and flush-joint slip-joint pipes (TBO) shall be fabricated from 9.5 to 13 m in length. Pipe length is identified as the distance between its ends; if a coupling is available the length is identified as the distance between the coupling free end and the end of thread run-out at the opposite end of the pipe. It is permissible to fabricate OTTG pipes from 8 to 9.5 m in length up to 20% of a batch made out of a cast workpiece (ingot). (Amended, Revision 4).

Sketch 1

Sketch 2

Sketch 3 * Dн - outside diameter of a normal coupling; Dc - outside diameter of a special coupling.

Sketch 4 (Amended, Rev.1, 2). 1.4. The following tolerances are set for the set for the size and mass of pipes and couplings: a) Outside Pipe Diameter: All nominal diameters Nominal Diameter up to 219 mm inclusive Nominal Diameter over 219 mm % (Design A); ±1,0% (Design B); ±1,25% (Design B).

The ends of pipes with triangular thread (OTTM and OTTG), and the field ends of TBO pipes shall be manufactured so that to ensure a minimum length of perfect thread without any pitting as specified in Item 2.20 and a minimum wall thickness in the plane of a pipe end as specified in notes to Tables 13, 14, 17 and 19. For flared ends of TBO pipes, it is permissible to increase the outside diameter at a distance of ( ) mm, by no more than 3 mm, while at a distance more than 500 mm from the pipe end outside pipe diameter tolerances shall be as specified herein; b) Wall Thickness Minus 12,5%.

Positive tolerances are limited by pipe mass; c) Outside coupling diameter: Normal Special ±1,0%, but no more than ±3 mm; mm; ±3,0 mm; of a single pipe % (Design А);

d) Coupling Length e) Mass

For a pipe batch (mass not less than 60 t) – minus 1,75% (Design А); For a single pipe % (Design B).

Note. Tolerances are not specified for Design A pipe batches not less than 60 tonnes in weight. Table 2

Short Triangular Thread Pipes and Couplings for Them
Sizes, mm Pipe Pipe Nominal Diameter Outside Diameter Wall Thickness 5,2 5,7 114 114,3 6,4 7,4 8,6 5,6 127 127,0 6,4 7,5 9,2 6,2 7,0 140 139,7 7,7 9,2 10,5 6,5 7,0 146 146,1 7,7 8,5 9,5 10,7 7,3 8,0 168 168,3 8,9 Inside Diameter 103,9 102,9 101,5 99,5 97,1 115,8 114,2 112,0 108,6 127,3 125,7 124,3 121,3 118,7 133,1 132,1 130,7 129,1 127,1 124,7 153,7 152,3 150,5 Mass per m, kg 14,0 15,2 16,9 19,4 22,3 16,7 19,1 22,1 26,7 20,4 22,9 25,1 29,5 33,6 22,3 24,0 26,2 28,8 32,0 35,7 29,0 31,6 35,1 187,7 181 9,1 166,0 177 8,0 153,7 (159,0) 171 5,2 (7,0) 141,3 (146,0) 165 4,6 (6,3) 127,0 (133,0) 158 3,7 (5,2) Outside Diameter Coupling Length Mass, kg

10,6 12,1 5,9 6,9 8,1 178 177,8 9,2 10,4 11,5 12,7 7,6 8,3 194 193,7 9,5 10,9 12,7 6,7 7,7 8,9 219 219,1 10,2 11,4 12,7 14,2 7,9 8,9 245 244,5 10,0 11,1 12,0 13,8 7,1 8,9 10,2 273 273,1 11,4 12,6

147,1 144,1 166,0 164,0 161,6 159,4 157,0 154,8 152,4 178,5 177,1 174,7 171,9 168,3 205,7 203,7 201,3 198,7 196,3 193,7 190,7 228,7 226,7 224,5 222,3 220,5 216,9 258,9 255,3 252,7 250,3 247,9

41,2 46,5 24,9 29,1 33,7 38,2 42,8 47,2 51,5 35,0 38,1 43,3 49,2 56,7 35,1 40,2 46,3 52,3 58,5 64,6 71,5 46,2 51,9 58,0 63,6 68,7 78,7 46,5 57,9 65,9 73,7 80,8 298,5 203 20,7 269,9 196 17,9 244,5 196 16,2 215,9 190 12,2 194,5 (198,0) 184 8,3 (10,0)

13,8 15,1 16,5 8,5 9,5 299 298,5 11,1 12,4 14,8 8,5 9,5 324 323,9 11,0 12,4 14,0 8,4 9,7 10,9 340 339,7 12,2 13,1 14,0 15,4 9,0 10,0 351 351,0 11,0 12,0 9,0 10,0 377 377,0 11,0 12,0 9,5 406 406,4 11,1 12,6 16,7 10,0

245,5 242,9 240,1 281,5 279,5 276,3 273,7 268,9 306,9 304,9 301,9 299,1 295,9 322,9 320,3 317,9 315,3 313,5 311,7 308,9 333,0 331,0 329,0 327,0 359,0 357,0 355,0 353,0 387,4 384,2 381,2 373,0 406,0

88,5 96,1 104,5 60,5 67,9 78,3 87,6 103,5 66,1 73,6 84,8 95,2 106,9 68,5 78,6 88,6 98,5 105,2 112,2 123,5 75,9 81,1 92,2 100,3 81,7 90,5 402,0 99,3 108,0 93,2 108,3 122,1 160,1 102,7 431,8 228 35,9 229 31,0 376,0 229 29,0 365,1 203 25,5 351,0 203 23,4 323,9 203 22,5

426

426,0

11,0 12,0

404,0 402,0 450,9 485,8 482,6 475,8

112,6 122,5 125,9 136,3 155,1 195,6

451,0

229

37,5

473

473,1

11,1 11,1

508,0

228

54,0

508

508,0

12,7 16,1

533,4

228

44,6

Table 3

Long Triangular Thread Pipe (U) and Couplings for Them
Size, mm Pipe Pipe Nominal Diameter Outside Diameter Wall Thickness 6,4 114 114,3 7,4 8,6 10,2 6,4 127 127,0 7,5 9,2 10,7 7,0 140 139,7 7,7 9,2 10,5 7,0 7,7 146 146,1 8,5 9,5 10,7 7,3 8,0 Inside Diameter 101,5 99,5 97,1 93,9 114,2 112,0 108,6 105,6 125,7 124,3 121,3 118,7 132,1 130,7 129,1 127,1 124,7 153,7 152,3 Mass per 1 m, kg 16,9 19,4 22,3 26,7 19,1 22,1 26,7 30,7 22,9 25,1 29,5 33,6 24,0 26,2 28,8 32,0 35,7 29,0 31,6 166,0 215 9,7 153,7 (159,0) 203 6,4 (8,5) 141,3 (146,0) 196 5,7 (7,0) 127,0 (133,0) 177 4,1 (5,6) Outside Diameter Coupling Length Mass kg

168

168,3

8,9 10,6 12,1 8,1 9,2 10,4

150,5 147,1 144,1 161,6 159,4 157,0 154,8 152,4 150,4 147,8 177,1 174,7 171,9 168,3 163,5 201,3 198,7 196,3 193,7 190,7 226,7 224,5 222,3 220,5 216,9 212,7

35,1 41,2 46,5 33,7 38,2 42,8 47,2 51,5 55,5 60,8 38,1 43,3 49,2 56,7 66,5 46,3 52,3 58,5 64,6 71,5 51,9 58,0 63,6 68,7 78,7 89,5

187,7

222

11,3

178

177,8

11,5 12,7 13,7 15,0 8,3 9,5

194,5 (198,0)

228

10,7 (12,4)

194

193,7

10,9 12,7 15,1 8,9 10,2

215,9

235

15,5

219

219,1

11,4 12,7 14,2 8,9 10,0

244,5

254

21,6

245

244,5

11,1 12,0 13,8 15,9

269,9

266

25,3

Table 4

Trapezoidal Thread Pipes and Couplings for Them - OTTM
Sizes, mm Pipe Pipe Nominal Diameter Outside Diameter Wall Thickness Inside Diameter Mass Outside Diameter per m, kg Coupling Length Mass, kg

6,4 114 114,3 7,4 8,6 10,2 6,4 127 127,0 7,5 9,2 10,7 6,2 7,0 140 139,7 7,7 9,2 10,5 6,5 7,0 146 146,1 7,7 8,5 9,5 10,7 7,3 8,0 168 168,3 8,9 10,6 12,1 6,9 8,1 9,2 178 177,8 10,4 11,5 12,7 13,7

101,5 99,5 97,1 93,9 114,2 112,0 108,6 105,6 127,3 125,7 124,3 121,3 118,7 133,1 132,1 130,7 129,1 127,1 124,7 153,7 152,3 150,5 147,1 144,1 164,0 161,6 159,4 157,0 154,8 152,4 150,4

16,9 19,4 22,3 26,7 19,1 22,1 26,7 30,7 20,4 22,9 25,1 29,5 33,6 22,3 24,0 26,2 28,8 32,0 35,7 29,0 31,6 35,1 41,2 46,5 29,1 33,7 38,2 42,8 47,2 51,5 55,5 194,5 (198,0) 187,3 198 8,6 (10,5) 5,3 187,7 177,8 190,0 9,5 4,8 166 156 182 7,9 4,4 153,7 (159,0) 149,2 182 5,3 (7,3) 4,1 141,3 (146,0) 136,5 174 4,8 (6,6) 3,3 127,0 (133,0) 123,8 170 4,0 (5,6) 3,0

15,0 7,6 8,3 194 193,7 9,5 10,9 12,7 15,1 7,7 8,9 219 219,1 10,2 11,4 12,7 14,2 7,9 8,9 10,0 245 244,5 11,1 12,0 13,8 15,9 8,9 10,2 11,4 273 273,1 12,6 13,8 15,1 16,5 8,5 9,5 299 298,5 11,1 12,4 14,8

147,8 178,5 177,1 174,7 171,9 168,3 163,5 203,7 201,3 198,7 196,3 193,7 190,7 228,7 226,7 224,5 222,3 220,5 216,9 212,7 255,3 252,7 250,3 247,9 245,5 242,9 240,1 281,5 279,5 276,3 273,7 268,9

60,8 35,0 38,1 43,3 49,2 56,7 66,5 40,2 46,3 52,3 58,5 64,6 71,5 46,2 51,9 58,0 63,6 68,7 78,7 89,5 57,9 65,9 73,7 80,8 88,5 96,1 104,5 60,5 67,9 78,3 87,6 103,5 323,9 218 24,1 298,5 285,8 218 22,2 12,0 269,9 257,2 218 19,9 10,7 244,5 231,8 218,0 18,0 9,6 215,9 206,4 206 13,4 8,0

8,5 9,5 324 323,9 11,0 12,4 14,0 9,7 10,9 340 339,7 12,2 13,1 14,0 15,4

306,9 304,9 301,9 299,1 295,9 320,3 317,9 312,3 313,5 311,7 308,9

66,1 73,6 84,8 95,2 106,9 78,6 88,6 98,5 105,2 112,2 123,5 365,1 218 27,3 351,0 218 25,1 -

Table 5

Supertight Joint Pipes and Couplings for Them - OTTG
Pipe Pipe Nominal Diameter
Wall Outside Diameter Thickness , mm , mm

Coupling Mass per m, kg Outside Diameter Length, Inside Mass, kg

Inside Diameter , mm

, mm Diameter (Maximum tolerance , mm

, mm 8,6 114 114,3 10,2 9,2 127 127,0 10,7 9,2 140 139,7 10,5 8,5 9,5 146 146,1 10,7 8,9 10,6 168 168,3 12,1 105,6 121,3 118,7 129,1 127,1 124,7 150,5 147,1 144,1 30,7 29,5 33,6 28,8 32,0 35,7 35,1 41,2 46,5 187,7 166,0 153,7 (159,0) 93,9 108,6 26,7 26,7 141,3 (146,0) 97,1 22,3 127,0 (133,0)

, mm 97 123,8 205 97 110 136,5 210 110 122 149,2 218 119 130 130 156,0 218 126 151 148 177,8 225 148 11,3 6,2 9,5 5,2 7,0 (9,1) 5,0 5,8 (7,9) 4,4 4,8 (6,8) 3,9

9,2 10,4 11,5 178 177,8 12,7 13,7 15,0 9,5 10,9 194 193,7 12,7 15,1 8,9 10,2 219 219,1 11,4 12,7 14,2 8,9 10,0 245 244,5 11,1 12,0 13,8 15,9 8,9 10,2 11,4 12,6 273 273,1 13,8 15,1 16,5

159,4 157,0 154,8 152,4 150,4 148,0 174,7 171,9 168,3 163,5 201,3 198,7 196,3 193,7 190,7 226,7 224,5 222,3 220,5 216,9 212,7 255,3 252,7 250,3 247,9 245,5 242,9 240,1

38,2 42,8 47,2 51,5 55,5 60,8 43,3 49,2 215,9 56,7 66,5 46,3 52,3 58,5 64,6 71,5 51,9 58,0 63,6 68,7 78,7 89,5 57,9 65,9 73,7 80,8 88,5 96,1 104,5 298,5 285,8 254 269,9 257,2 254 244,5 231,8 254 206,4 242 194,5 (198,0) 187,3 234

160 158 158 158 158 158 175 175 15,7 172 172 203 203 198 198 198 226 223 223 223 223 223 256 256 256 256 256 256 256 26,7 14,8 23,9 13,2 21,6 11,9 9,4 10,6 (13,9) 6,8

Notes: 1. Where the values of coupling outside diameter and mass for Designs A and B are different, Design B values are shown in brackets. (Tables 2-5). 2. Special couplings with small outside diameter ( ) are made Design A only (Table 4 and 5).

(Amended, Rev. 4) Table 6

Flush-Joint Slip-Joint Pipes - TBO
Sizes, mm Pipe Nominal Diameter Outside Diameter Wall Thickness Inside Diameter Upset Flared Upset Flared End End Length Mass per m, Diameter kg (Maximum Tolerance ±0,5) 9,2 127 127,0 10,7 9,2 140 139,7 10,5 8,5 9,5 146 146,1 10,7 8,9 10,6 168 168,3 12,1 9,2 10,4 11,5 178 177,8 12,7 13,7 15,0 9,5 10,9 194 193,7 12,7 15,1 168,3 163,5 144,1 159,4 157,0 154,8 152,4 150,4 147,8 174,7 171,9 206 120 56,7 66,5 1,6 2,8 187 116 124,7 150,5 147,1 178 112 46,5 38,2 42,8 47,2 51,5 55,5 60,8 43,3 49,2 1,1 0,7 1,1 1,6 2,2 2,6 2,8 0,0 0,7 118,7 129,1 127,1 162 108 35,7 35,1 41,2 0,7 0,0 0,5 105,6 121,3 154 108 33,6 28,8 32,0 0,8 0,1 0,4 108,6 136 104 26,7 29,5 0,6 0,5 22,0 Single Pipe Mass Reduction Due to End Machining, kg

0,2

Note to Tables 2-6. For mass calculations mass of steel was assumed at 7,85 g/cm .

(Amended, Rev. 3). 1.5. It is not permissible to have out-of-roundness in Design B pipes in excess of 0.8 maximum tolerances for the outside diameter except for repaired locations. 1.6. On end sections equal to one third of the pipe length it is not permissible to have camber more than 1.3 mm per m of length. It is not permissible to have the total camber of a whole pipe (depth of camber) more than 1/2000th of the pipe length, as measured in the middle of the pipe. 1.7. A symbolic notation for pipes shall include joint type (except for short triangular thread OTTM & OTTG pipe couplings) and a reference to this standard. Symbolic Notation Samples: Pipes made of Strength Grade D steel, with a nominal diameter of 245 mm, wall thickness of 10 mm, and couplings for them: 245х10-D GOST 632-80 – for pipes with short triangular thread; 245-D GOST 632-80 – for couplings for such pipes; U-245х10-D GOSt 632-80 – pipes with a long triangular thread; U-245-D GOST 632-80 – couplings for such pipes; OTTM-245х10-D GOST 632-80 – trapezoidal thread pipes; OTTM-245-D GOST 632-80 – normal couplings for such pipes; ОТТМ-245-D-S GOST 632-80 – special couplings (with small outside diameter) for such pipes; OTTG-245х10-D GOST 632-80 – supertight joint pipes; OTTG-245-D GOST 632-80 – normal couplings for such pipes; OTTG-245-D-S GOST 632-80 – special couplings (with small outside diameter) for such pipes. Strength Grade D flush-joint slip-joint pipes, with a nominal diameter of 168 mm and wall thickness of 9 mm: TBO-168х9-Д GOST 632-80 Notes: 1. When ordering OTTM and OTTG pipes with special couplings made of steel of the following strength grades, the symbolic notation for the couplings shall include a reference to a steel strength grade required. 2. Design A pipes and coupling designation is followed by the letter A.

2. TECHNICAL REQUIREMENTS
2.1. Pipes and couplings shall be fabricated in accordance with the requirements of this standard and process regulations as approved in accordance with the established procedure. 2.2. The outside and inside surfaces of pipes and couplings shall be free of any blisters, cavities, cracks, laminations and sand holes. Cut and cleaning of these defects are allowed, provided their depth does not exceed wall thickness maximum negative tolerance. No welding-up, fullering or luting of defect areas is allowed. In areas where wall thickness can be measured directly, the depth of the defected areas shall not exceed the value specified in this section, provided that minimal wall thickness is preserved, which is calculated as the difference between

nominal pipe wall thickness and its negative tolerance. Separate minor dents, buckles, scratch marks, a thin layer of scale and other defects caused by the method of fabrication are allowed, if they do not bring the wall thickness beyond the negative tolerance limit. 2.3. The place of transition from an upset end of TBO pipe to parts with a wall thickness S shall not have any sharp ledges. It is not permitted to have any of the defects specified in Item 2.2. on the surface with the diameter min from a pipe end. on a length of lв

The outside and inside surfaces of an upset part of a flared end will have no more than defected locations beyond from the pipe end (underfilling with metal and repairs of defects), the length of each of which shall be no more than 50 mm, the width no more than 20 mm and the depth no more than 2 mm.

Wall thickness in the transition part of all pipes with outside upset ends shall not be less than the minimal allowable wall thickness of plain pipe.
2.4. The mass fraction of sulfur and phosphorus in steel shall be no more than 0.045% of each element. 2.5. Pipes and couplings shall be fabricated out of a grade of steel specified in Table.7. Table 7 Parameter Description D Design A Breaking Strength MPa (kgf/cm ) Yield Stress (kgf/mm ) no more than, MPa (kgf/mm Stretch Ratio, ) 552 (56,2) 14,3 16,0 12,0 758 (77,3) 13,0 862 (87,9) 12,3 965 (98,4) 10,8 1137 1241 (116,0) (126,5) 9,5 8,5 : no less than, MPa 379 (38,7) 373 (38,0) 490 (50,0) 552 (56,2) 655 (66,8) 758 (77,3) 930 (94,9) 1034 (105,5) , no less than 655 (66,8) B 637 (65,0) Standard Mechanical Properties by Strength Grade K Design B 687 (70,0) E 689 (70,3) L 758 (77,3) M 862 (87,9) R T

1000 1103 (101,9) (112,5)

, %, no less than

Note: No maximum yield stress value is set for Strength Grade D steel pipes. (Amended, Rev. 2, 3). 2.6. Pipes and couplings shall be fabricated out of a steel of one and the same strength grade of steel. It is permissible to fabricate pipes with couplings out of steel with higher mechanical properties. At the customer’s request, special lower outside diameter couplings for OTTM and OTTG pipes shall be made out of steel that belongs with subsequent strength grades with higher mechanical properties. (Amended, Rev. 4). 2.7. Pipes and couplings of Strength Grade K and higher shall be subjected to thermal and thermomechanical treatment. TBO pipes of all strength grades shall be thermotreated after upsetting the flared end. 2.8. Pipes shall successfully undergo a flattening test. After the test the distance between parallel planes shall not be larger

than that specified in Table 8. 2.9. Threads and female sealing cones of couplings shall be galvanized or phosphated. 2.10. Each triangular thread, OTTM and OTTG pipe shall be furnished with a coupling screwed on one of its ends by a coupling screwing machine. Grease or other sealants shall be used for screwing pipes with couplings to ensure tightness of joints and prevent from pickups and corrosion. Table 8 Strength Grade D K, E L D K, E L Less than 16 16 and more Diameter to Wall Thickness Ratio D/s Distance Between Parallel Planes, mm 0,65 0,70 0,75 (0,98-0,02 (1,18-0,03 (1,23-0,03 ) ) )

Note: The distance between the parallel planes for steel strength grades M, R and T shall be established as agreed between the manufacturer and the customer. 2.11. Outside surface of each pipe and coupling shall be painted to protect from corrosion at the customer’s request. 2.12. Pipes with screwed on couplings as well as flush-joint slip-on pipes shall pass an inside hydraulic pressure test. Pressure test values ( ) are calculated with the following formula: (kgf/cm );

(MPa), where - nominal wall thickness, mm; - nominal outside pipe diameter, mm; - allowable stress, kgf/mm (MPa). for pipes with a nominal diameter of 273 mm and more is

For Design A Strength Grade D pipes, the allowable pressure set at 0,6 and for all other pipes at .

At the customers request, for Design A pipes the allowable stress 273 mm and more is set at 0,8 .

for Strength Grade D pipes with a nominal diameter of

The allowable stress R value is set at 0,8

for Design B pipes with a nominal diameter up to 219 mm inclusive and

at 0,6

. for pipes with a nominal diameter more than 219 mm.

Pressure values for short triangular thread pipes up to 245 mm inclusive and for all diameters of OTTG and TBO pipes are specified in Table 9 (Design A). For short triangular thread pipes with a nominal diameter more than 245 mm, for all diameters of pipes with long triangular thread and OTTM pipes pressure-limited by the coupling strength (Table10), the test pressure is set at the lowest of the values out of those specified in Tables 9 and 10 (Design 10). Test pressure values (for Design B) are specified in Table 10a. Pressure values for pipes limited by the strength of couplings shall be calculated with the following formula:

(kgm/cm );

(MPa),

where

- nominal outside diameter of a normal and special coupling, mm; - minimum yield strength, kgf/mm (MPa);

- outside diameter of the coupling thread in the plane of a pipe end face after being screwed on a machine, calculated with the following formula: , where - inside thread diameter at a coupling end face in the plane of a coupling end face, mm; - profile height, mm; - total pipe thread length (to the end of the runout), mm; - thread conicity. Table 9

Pressure Test Values for Design A Pipes
Pipe Nominal Wall Diameter, Thickness, mm mm D 5,2 5,7 114 6,4 7,4 27,5 (280) 30,4 (310) 33,8 (345) 39,2 (400) Pressure for steel strength grades, MPa (kgf/cm ) E 49,5 (505) 56,9 (580) L 58,7 (600) 67,7 (690) M 67,7 (690) 78,5 (800) R 96,1 (980) T 2

8,6 10,2 5,6 6,4 127 7,5 9,2 10,7 6,2 7,0 140 7,7 9,2 10,5 6,5 7,0 7,7 146 8,5 9,5 10,7 7,3 8,0 168 8,9 10,6

45,6 (465) 27,0 (275) 30,4 (310) 35,8 (365) 44,1 (450) 51,0 (520) 27,0 (275) 30,4 (310) 33,8 (345) 40,2 (410) 45,6 (465) 27,0 (275) 29,4 (300) 32,4 (330) 35,3 (360) 39,7 (405) 44,5 (455) 26,5 (270) 28,9 (295) 31,9 (325) 38,3 (390)

66,2 (675) 44,6 (455) 52,0 (530) 63,8 (650) 74,6 (760) 44,2 (450) 48,6 (495) 57,9 (590) 66,3 (675) 42,1 (430) 46,6 (475) 51,5 (525) 57,9 (590) 64,7 (660) 38,3 (390) 42,1 (430) 46,6 (475) 55,4 (565)

79,0 (805) 93,7 (955) 53,0 (540) 61,8 (630) 76,0 (775) 83,3 (900) 52,5 (535) 57,9 (590) 60,2 (705) 79,0 (805) 50,0 (510) 55,4 (565) 61,3 (625) 68,2 (695) 77,0 (785) 50,0 (510) 55,4 (565) 66,2 (675)

91,2 (930) 108,4 (1105) 61,3 (625) 71,6 (730) 87,8 (895) 102,0 (1040) 60,8 (620) 66,9 (680) 80,0 (815) 91,2 (930) 58,3 (595) 64,3 (655) 70,6 (720) 79,0 (805) 89,3 (910) 64,3 (655) 76,5 (780)

111,8 (1140) 122,6 (1250) 87,8 (895) 107,9 (1100) 122,6 (1250) 82,1 (835) 98,1 (1000) 111,8 (1140) 86,8 (885) 97,1 (990) 109,4 (1115) 79,0 (805) 93,7 (955)

122,6 (1250) 122,6 (1250) 97,6 (995) 119,7 (1220) 122,6 (1250) 91,2 (930) 108,9 (1110) 122,6 (1250) 96,6 (985) 107,9 (1100) 121,6 (1240) 87,3 (890) 104,0 (1060)

12,1 5,9 6,9 8,1 9,2 10,4 178 11,5 12,7 13,7 15,0 7,6 8,3 9,5 194 10,9 12,7 15,1 6,7 7,7 8,9 219 10,2 11,4 12,7

(43,7 (445) 20,1 (205) 23,5 (240) 27,5 (280) 31,4 (320) 35,3 (360) 39,2 (400) 43,2 (440) 24,0 (245) 26,0 (265) 29,9 (305) 34,3 (350) 39,7 (405) 18,6 (190) 21,6 (220) 24,5 (250) 28,5 (290) 31,4 (320) 35,3

63,3 (645) 40,2 (410) 45,6 (465) 51,5 (525) 57,0 (580) 62,8 (640) 68,2 (695) 37,8 (385) 43,2 (440) 49,6 (505) 57,9 (590) 35,8 (365) 41,2 (420) 46,1 (470) 51,0

75,5 (770) 47,6 (485) 54,4 (555) 61,3 (625) 67,7 (690) 75,0 (765) 80,9 (825) 88,3 (900) 45,1 (460) 51,5 (525) 58,9 (600) 68,7 (700) 81,9 (835) 42,7 (435) 49,1 (500) 54,4 (555) 60,8

87,3 (890) 62,8 (640) 71,1 (725) 78,5 (800) 86,8 (885) 93,7 (955) 102,5 (1045) 52,0 (530) 59,4 (605) 68,2 (695) 79,5 (810) 94,7 (965) 49,1 (500) 56,4 (575) 63,3 (645) 70,1

106,9 (1090) 77,0 (785) 87,3 (890) 96,1 (980) 106,4 (1085) 114,8 (1170) 122,6 (1250) 63,8 (650) 73,1 (745) 83,9 (855) 97,6 (955) 116,2 (1185) 69,2 (705) 77,5 (790) 86,3

118,7 (1210) 85,8 (875) 96,6 (985) 107,0 (1090) 118,2 (1205) 122,6 (1250) 122,6 (1250) 71,1 (725) 80,9 (825) 93,2 (950) 108,4 (1105) 122,6 (1250) 85,8 (875) 95,6

(360) 14,2 7,9 8,9 10,0 245 11,1 12,0 13,8 15,9 7,1 8,9 10,2 11,4 273 12,6 13,8 15,1 16,5 8,5 9,5 299 11,1 12,4 14,8 19,6 (200) 22,1 (225) 25,0 (255) 27,5 (280) 29,9 (305) 34,3 (350) 11,8 (120) 14,7 (150) 17,2 (175) 19,1 (195) 21,1 (215) 23,1 (235) 12,8 (130) 14,7 (150) 16,7 (170) 18,6 (190) -

(520) 57,3 (585) 31,9 (325) 36,3 (370) 40,2 (410) 43,2 (440) 49,5 (505) 28,9 (295) 32,9 (335) 36,8 (375) 40,7 (415) 44,6 (455) 48,6 (495) 32,9 (335) 36,8 (375) 43,7 (445)

(620) 68,2 (695) 38,3 (390) 42,7 (435) 47,6 (485) 51,5 (525) 59,4 (605) 68,2 (695) 34,3 (350) 39,2 (400) 43,7 (445) 48,6 (495) 53,0 (540) 57,9 (590) 63,3 (645) 39,2 (400) 43,7 (445) 52,0 (530)

(715) 78,5 (800) 44,1 (450) 49,5 (505) 54,9 (560) 59,4 (605) 68,7 (700) 79,0 (805) 39,7 (405) 45,1 (460) 50,5 (515) 55,9 (570) 61,3 (625) 67,2 (685) 73,1 (745) 45,1 (460) 50,5 (515) 60,3 (615)

(880) 96,6 (985) 60,8 (620) 67,7 (690) 73,1 (745) 83,9 (855) 96,6 (985) 55,4 (565) 62,3 (635) 68,7 (700) 75,1 (765) 82,4 (840) 90,3 (920) 61,8 (630) 74,1 (755)

(975) 107,4 (1095) 67,7 (690) 75,0 (765) 81,4 (830) 93,2 (950) 107,4 (1095) 76,5 (780) 83,5 (850) 91,7 (935) 100,1 (1020) 68,7 (700) 81,9 (835)

8,5 9,5 324 11,0 12,4 14,0 8,4 9,7 10,9 340 12,2 13,1 14,0 15,4 9,0 10,0 351 11,0 12,0 9,0 10,0 377 11,0 12,0 9,5 11,1 406

12,3 (125) 13,7 (140) 15,7 (160) 17,7 (180) 19,6 (200) 11,3 (115) 13,2 (135) 14,6 (150) 16,4 (170) 17,5 (180) 19,7 (190) 11,8 (120) 12,8 (130) 14,2 (145) 15,7 (160) 10,8 (110) 12,3 (125) 13,2 (135) 14,7 (150) 10,8 (110) 12,3 (125)

26,0 (265) 29,9 (305) 33,8 (345) 38,3 (390) 25,0 (255) 28,4 (290) 31,9 (325) 33,8 (345) 36,3 (370) 25,0 (255) 27,5 (280) 30,0 (305) 23,5 (240) 25,5 (260) 28,0 (285) 24,0 (245)

30,9 (315) 35,8 (365) 40,2 (410) 45,1 (460) 29,9 (305) 33,8 (345) 37,8 (385) 40,2 (410) 43,2 (440) 47,6 (485) 30,0 (305) 32,9 (335) 35,8 (365) 30,4 (310) 33,4 (340) -

41,2 (420) 46,6 (475) 52,5 (535) 43,7 (445) 46,6 (475) 50,0 (510) 54,9 (560) 38,3 (390) 41,7 (425) -

56,9 (580) 64,3 (655) 57,4 (585) 61,3 (625) 67,7 (690) -

63,8 (650) 71,6 (730) 63,8 (650) 68,2 (695) 75,0 (765) -

12,6 16,7 10,0 426 11,0 12,0 473 11,1 11,1 508 12,7 16,1

14,2 (145) 18,8 (190) 10,8 (110) 11,8 (120) 12,6 (130) 10,8 (110) 9,8 (100) 11,3 (115) 14,2 (145)

27,5 (280) 36,2 (370) 22,6 (230) 25,0 (255) -

-

-

-

-

Note: 1. Upon customer’s request, the upper limit of the test pressure may be limited to 68,7 MPa (700 kgf/cm ). 2. If the estimated pressure ( kgf/cm ). ) exceeds 122,6 MPa (1250 (kgf/cm ), the test pressure shall be set at 122,6 MPa (1250

Table 10

Hydrotest Pressure Values (Design A)
Pressure for Couplings Out of Steel by Strength Group, MPa (kgf/cm ) Pipe Nominal Diameter, mm Short D 114 127 140 146 168 178 194 219 245 273 299 E L M R T D E Triangular Thread Joints Long (U) L M R T D E 56,3 (575) 55,9 (570) 51,3 (525) 63,2 (645) 55,5 (565) 47,8 (485) 54,8 (560) 54,8 (560) 49,7 (505) 45,0 (460) 41,5 Normal Coupling L 66,9 (680) 66,5 (680) 61,0 (620) 75,2 (765) 66,0 (675) 56,8 (580) 65,2 (665) 65,2 (665) 59,0 (600) 53,4 (545) 49,2 M 77,4 (790) 77,0 (785) 70,5 (720) R T D E 46,3 (470) 42,4 (430) 39,5 (405) 39,0 (400) 33,8 (345) 32,6 (335) 37,1 (380) 33,7 (345) 30,4 (310) 27,4 (280) OTTM Special Coupling L 55,0 (560) 50,4 (515) 47,0 (480) 46,5 (475) 40,2 (410) 38,8 (395) 44,0 (450) 40,1 (410) 36,1 (370) 32,5 (330) M 63,6 (650) 58,3 (595) 54,3 (555) 53,7 (550) 46,6 (475) 44,9 (460) 51,0 (520) 46,4 (475) 41,8 (425) 37,7 (385) R 78,2 (795) 71,6 (730) 66,8 (680) 66,0 (675) 57,2 (585) 55,1 (560) 62,6 (640) 57,0 (580) 51,3 (525) 46,2 (470) T 86,8 (885) 79,5 (810) 74,1 (755) 73,2 (745) 63,4 (645) 61,3 (625) 69,5 (710) 63,2 (645) 57,0 (580) 51,2 (525) 2

40,4 58,6 59,7 80,7 99,0 110,0 38,7 (410) (600) (710) (825) (1010) (1120) (395) 41,0 59,6 70,8 82,0 100,6 111,7 38,5 (420) (610) (720) (835) (1025) (1140) (395) 37,6 54,3 65,4 75,0 92,6 102,3 35,3 (385) (555) (660) (765) (940) (1045) (360) 46,3 67,3 80,0 92,6 113,6 122,6 43,5 (475) (685) (815) (945) (1160) (1250) (445) 40,6 59,0 70,1 81,1 99,6 110,6 38,2 (415) (600) (715) (825) (1015) (1130) (390) 35,1 51,0 60,6 70,1 86,1 (360) (520) (620) (715) (880) 95,6 (975) 32,8 (335)

94,9 105,5 31,9 (970) (1075) (325) 94,4 104,9 29,2 (965) (1070) (300) 86,6 (885) 96,2 (980) 27,3 (280)

87,1 106,9 118,7 26,9 (890) (1090) (1210) (275) 76,4 (780) 65,7 (670) 75,4 (770) 75,5 (770) 68,3 (695) 61,9 (630) 57,0 93,4 104,1 23,3 (955) (1060) (240) 80,7 (825) 89,6 (915) 22,4 (230)

39,8 57,9 68,7 79,5 97,7 108,5 37,7 (405) (590) (700) (810) (995) (1105) (385) 39,9 58,0 68,8 79,7 97,8 108,6 37,7 (405) (590) (700) (815) (995) (1110) (385) 36,6 53,0 63,1 73,1 89,6 99,5 34,2 (375) (540) (645) (745) (915) (1015) (350) 31,0 (315) 28,5

92,6 102,9 25,5 (945) (1050) (260) 92,7 102,9 23,2 (945) (1050) (235) 83,9 (855) 75,9 (775) 70,0 93,2 (950) 84,3 (860) 77,8 20,9 (215) 18,8 (190) -

31,1 45,1 53,6 62,1 76,2 84,6 (315) (460) (545) (635) (775) (865) 28,6 41,6 49,4 57,2 70,2 78,0

(290) (425) (505) (585) (715) (795) 324 340 351 377 406 426 473 508 27,8 40,5 48,1 55,7 68,4 76,0 (285) (415) (490) (570) (700) (775) 25,3 36,8 43,7 50,6 62,2 69,0 (260) (375) (445) (515) (635) (705) 24,9 36,2 43,0 49,8 (255) (370) (440) (510) 23,3 33,8 40,3 (240) (345) (410) 22,0 32,0 (225) (325) 20,8 30,2 (210) (310) 24,4 (250) 17,8 (180) -

(290) 27,8 (285) 25,3 (260) -

(425) 40,4 (410) 36,7 (375) -

(500) 48,0 (490) 43,6 (445) -

(580) 55,5 (565) 50,9 (515) -

(715) 68,1 (695) 62,0 (630) -

(795) 75,7 (770) 68,8 (700) -

-

-

Note: If the estimated pressure (

) exceeds 122,6 MPa (1250 kgf/cm ), the test pressure shall be set at 122,6 MPa (1250 kgf/cm ).

Table 10a

Hydrotest Pressure Values (Design B)
Pressure for Couplings Out of Steel by Strength Grade, MPa (kgf/mm ) Pipe Nominal Diameter, mm Short D K E L M R T D K E Triangular Thread Pipes Long (U) L M R T D K OTTM Normal Coupling E L M R T

114 127 140 146 168 178 194 219 245 273 299 324 340 406 473 508

50,0 510 46,7 475 43,8 445 43,4 440 37,9 385 37,1 380 37,2 380 37,0 375 33,5 340 30,6 310 28,2 285 27,4 280 24,9 255 21,6 220 24,0 245 17,5

65,7 670 61,3 625 57,5 585 57,0 580 49,8 510 48,7 495 48,9 500 48,6 495 44,0 450 40,1 410 37,0 375 36,0 370 32,7 335 28,4 290 31,5 320 23,0

74,1 87,9 101,7 124,8 138,7 51,4 67,5 76,0 90,2 104,4 128,1 142,4 48,9 64,2 72,3 85,8 99,3 121,8 135,5 755 895 1035 1275 1415 525 690 775 920 1065 1305 1455 500 655 735 875 1015 1245 1380 69,0 82,0 94,8 116,3 129,3 48,6 63,9 72,0 85,4 98,8 121,3 134,8 45,4 59,6 67,2 79,7 92,2 113,2 125,8 705 835 965 1185 1320 495 650 735 870 1010 1235 1375 460 610 685 815 940 1155 1285 64,8 76,8 88,9 109,1 121,3 45,6 59,9 67,5 80,1 92,7 113,8 126,5 42,7 56,1 63,2 75,0 86,8 106,5 118,4 660 785 905 1115 1235 465 610 685 815 945 1160 1290 435 570 645 765 885 1085 1210 64,2 76,2 88,2 108,2 120,3 45,6 59,8 67,4 655 775 900 1105 1230 465 610 685 56,1 66,6 77,0 570 680 785 54,9 65,2 75,4 560 665 770 55,1 65,4 75,6 560 665 770 54,8 65,0 75,2 555 665 765 49,6 58,9 68,1 505 600 695 45,2 53,6 62,1 460 545 635 41,7 49,4 57,2 425 505 585 40,6 48,2 55,7 415 490 570 36,9 375 80 815 92,6 113,6 126,3 42,1 55,3 62,3 73,9 85,5 104,9 116,6 945 1160 1290 430 565 635 755 870 1070 1190

94,5 105,1 39,8 52,3 58,9 69,9 80,9 99,2 110,3 36,8 48,3 54,4 64,6 74,7 91,7 101,9 965 1070 405 535 600 715 825 1015 1130 375 495 555 660 760 935 1040 92,5 102,9 39,2 51,5 58 945 1050 400 525 590 68,8 79,6 97,7 108,6 36,4 47,8 53,9 63,9 74,0 90,8 100,9 700 810 995 1110 370 490 550 650 755 925 103,0*

92,8 103,2 39,2 51,4 58,0 68,8 79,6 97,6 108,6 36,5 48,0 54,1 64,2 74,2 91,1 101,3 945 1050 400 525 590 700 810 995 1110 370 490 550 655 755 930 1035 92,2 102,6 39,2 51,5 58,0 68,9 79,7 97,8 108,7 36,6 48,1 54,2 64,3 74,4 91,3 101,5 940 1045 400 525 590 700 815 995 1110 375 490 550 655 760 930 1035 83,6 855 76,2 775 70,2 715 68,4 700 92,9 35,9 47,2 53,2 63,1 73,0 89,6 99,6 33,2 43,6 49,1 58,3 67,4 82,7 950 365 480 540 645 745 915 1015 340 445 500 595 690 845 84,7 865 78,0 795 76,0 775 30,0 38,4 44,4 52,7 61,0 74,9 305 400 450 540 620 765 27,7 36,3 40,9 48,6 56,2 280 370 415 495 575 27,0 35,4 39,9 47,4 54,8 275 360 405 485 560 24,5 32,2 36,2 250 330 370 92,0 940 83,2 850 -

180 351 377 426 24,3 250 22,7 230 20,3 205

235 31,9 325 30,0 305 26,6 270 -

Pressure values for all Design B pipes are specified in Table 11.

Table 11

Design B Pipe Hydrotest Pressure Values
Pipe Nominal Diameter, mm Wall Thickness, mm D 6,4 114 7,4 8,6 6,4 127 7,5 9,2 6,2 7,0 140 7,7 9,2 10,5 6,5 7,0 146 7,7 8,5 9,5 10,7 7,3 33,3 (340) 38,7 (395) 45,1 (460) 29,9 (305) 35,3 (360) 43,2 (440) 26,5 (270) 29,9 (305) 32,9 (335) 39,2 (400) 44,6 (455) 26,5 (270) 28,4 (290) 31,4 (320) 34,8 (355) 38,7 (395) 43,6 (445) 26,0 (265) Pressure for Pipes Out of Steel by Strength Grades, MPa (kgf/cm )

K 44,1 (450) 51,0 (520) 58,9 (600) 39,7 (405) 46,1 (470) 56,9 (580) 34,8 (355) 39,2 (400) 43,2 (440) 51,5 (525) 58,9 (600) 34,8 (355) 37,8 (385) 41,2 (420) 45,6 (465) 51,0 (520) 57,4 (585) 33,8 (345)

E 49,5 (505) 56,9 (580) 66,2 (675) 44,6 (455) 52,0 (530) 63,8 (650) 39,2 (400) 44,2 (450) 48,6 (495) 57,9 (590) 66,3 (675) 39,2 (400) 42,2 (430) 46,6 (475) 51,5 (525) 57,9 (590) 64,7 (660) 38,3 (390)

L 67,7 (690) 79,0 (805) 61,8 (630) 76,0 (775) 57,9 (590) 69,2 (705) 79,0 (805) 50,0 (510) 55,4 (565) 61,3 (625) 68,2 (695) 77,0 (785) 45,6 (465)

M 78,5 (800) 91,2 (930) 71,6 (730) 87,8 (895) 66,9 (680) 80,0 (815) 91,2 (930) 64,3 (655) 70,6 (720) 79,0 (805) 89,3 (910) -

R 96,1 (980) 111,8 (1140) 87,8 (895) 107,9 (1100) 82,1 (835) 98,1 (1000) 111,8 (1140) 79,0 (805) 86,8 (885) 97,1 (990) 109,4 (1115) -

T 122,6 (1250) 97,6 (995) 119,7 (1220) 91,2 (930) 108,9 (1110) 122,6 (1250) 87,8 (895) 96,6 (985) 107,9 (1100) 121,6 (1240) -

8,0 168 8,9 10,6 12,1 6,9 8,1 178 9,2 10,4 11,5 12,7 7,6 8,3 194 9,5 10,9 12,7 7,7 8,9 219 10,2 11,4 12,7 14,2 7,9

28,4 (290) 31,4 (320) 37,8 (385) 42,7 (435) 23,0 (235) 27,0 (275) 30,9 (315) 34,8 (355) 38,7 (395) 42,7 (435) 23,5 (240) 25,5 (260) 29,4 (300) 33,4 (340) 39,2 (400) 21,1 (215) 24,0 (245) 27,9 (285) 30,9 (315) 34,3 (350) 38,7 (395) 14,2 (145)

37,2 (380) 41,7 (425) 49,5 (505) 56,4 (575) 30,4 (310) 35,8 (365) 40,7 (415) 46,1 (470) 50,5 (515) 55,9 (570) 30,9 (315) 33,8 (345) 38,2 (390) 44,1 (450) 51,5 (525) 27,5 (280) 31,9 (325) 36,3 (370) 40,7 (415) 45,6 (465) 51,0 (520) 19,1 (195)

43,0 (430) 46,6 (475) 55,4 (565) 63,3 (645) 34,3 (350) 40,2 (410) 45,6 (465) 51,5 (525) 57,0 (580) 62,8 (640) 34,8 (355) 37,8 (385) 43,2 (440) 49,6 (505) 57,9 (590) 30,9 (315) 35,8 (365) 41,2 (420) 46,1 (470) 51,0 (520) 57,4 (585) 21,6 (220)

51,0 (510) 55,4 (565) 66,2 (675) 75,5 (770) 47,6 (485) 54,4 (555) 61,3 (625) 67,7 (690) 75,0 (765) 45,1 (460) 51,5 (525) 58,9 (600) 68,7 (700) 42,7 (435) 49,1 (500) 51,4 (555) 60,8 (620) 68,2 (695) -

64,3 (655) 76,5 (780) 87,3 (890) 62,8 (640) 71,1 (725) 78,5 (800) 86,8 (885) 59,4 (605) 68,2 (695) 79,5 (810) 49,1 500 56,4 (575) 63,3 (645) 70,1 (715) 78,5 (800) -

79,0 (805) 93,7 (955) 106,9 (1090) 77,0 (785) 87,3 (890) 96,1 (980) 106,4 (1085) 73,1 (745) 83,9 (855) 97,6 (995) 69,2 (705) 77,5 (790) 86,3 (880) 96,6 (935) -

87,3 (890) 104,0 (1060) 118,7 (1210) 85,8 (875) 96,6 (985) 107,0 (1090) 118,2 (1205) 80,9 (825) 93,2 (950) 108,4 (1105) 77,0 (785) 85,8 (875) 95,6 (975) 107,4 (1095) -

8,9 10,0 245 11,1 12,0 13,8 7,1 8,9 273 10,2 11,4 12,6 13,8 8,5 9,5 299 11,1 12,4 14,8 9,5 11,0 324 12,4 14,0 9,7 10,9

16,2 (165) 18,1 (185) 20,1 (205) 22,1 (225) 25,0 (255) 11,8 (120) 14,7 (150) 16,7 (170) 18,6 (190) 20,6 (210) 22,6 (230) 12,7 (130) 14,2 (145) 16,7 (170) 18,6 (190) 22,1 (225) 13,2 (135) 15,2 (155) 17,1 (175) 19,1 (195) 12,8 (130) 14,2

21,6 (220) 24,0 (245) 26,5 (270) 28,9 (295) 33,4 (340) 15,2 (155) 19,1 (195) 22,1 (225) 24,5 (250) 27,0 (275) 29,9 (305) 16,7 (170) 18,6 (190) 22,1 (225) 24,5 (250) 28,9 (295) 17,2 (175) 20,1 (205) 22,6 (230) 25,5 (260) 16,7 (170) 18,6

24,0 (245) 27,0 (275) 29,9 (305) 32,4 (330) 37,3 (380) 17,2 (175) 21,6 (220) 24,5 (250) 27,5 (280) 30,4 (310) 33,4 (340) 18,6 (190) 21,1 (215) 24,5 (250) 27,5 (280) 32,9 (335) 19,6 (200) 22,6 (230) 25,5 (260) 28,4 (290) 18,6 (190) 21,1

28,4 (290) 31,9 (325) 35,8 (365) 38,7 (395) 44,1 (450) 25,5 (260) 29,4 (300) 32,9 (335) 36,3 (370) 39,7 (405) 25,0 (255) 29,4 (300) 32,4 (330) 38,7 (395) 26,5 (270) 29,9 (305) 33,8 (345) -

32,9 (335) 37,3 (380) 41,2 (420) 44,6 (455) 51,5 (525) 29,4 (300) 33,8 (345) 37,8 (385) 42,2 (430) 46,1 (470) 28,9 (295) 33,8 (345) 37,8 (385) 45,1 (460) 30,9 (315) 34,8 (355) 39,2 (400) -

45,6 (465) 50,5 (515) 54,9 (560) 63,3 (645) 41,7 (425) 46,6 (475) 51,5 (525) 56,4 (575) 35,3 (360) 41,7 (425) 46,6 (475) 55,4 (565) 37,8 (385) 42,7 (435) 48,0 (490) -

50,5 (515) 56,4 (575) 60,8 (620) 70,1 (715) 46,6 (475) 52,0 (530) 57,4 (585) 62,8 (640) 39,7 (405) 46,1 (470) 51,5 (525) 61,3 (625) 42,2 (430) 47,6 (485) 53,5 (545) -

(145) 340 12,2 13,1 14,0 9,0 10,0 351 11,0 12,0 9,0 10,0 377 11,0 12,0 9,5 11,1 406 12,6 10,0 426 11,0 12,0 473 508 11,1 11,1 16,2 (165) 17,2 (175) 18,6 (190) 11,3 (115) 12,7 (130) 14,2 (145) 15,2 (155) 10,8 (110) 11,8 (120) 13,2 (135) 14,2 (145) 10,3 (105) 12,2 (125) 13,7 (140) 10,3 (105) 11,8 (120) 12,7 (130) 10,3 (105) 9,8 (100)

(190) 21,1 (215) 22,6 (230) 24,0 (245) 15,2 (155) 16,7 (170) 18,6 (190) 20,1 (205) 14,2 (145) 15,7 (160) 17,2 (175) 18,6 (190) 13,7 (140) 16,2 (165) 18,1 (185) 13,7 (140) 15,2 (155) 16,7 (170) 13,7 (140) 12,7 (130)

(215) 23,5 (240) 25,5 (260) 27,4 (280) -

Note: 1. If the estimated pressure ( ) exceeds 68,7 MPa (700 kgf/cm ), the test pressure shall be set at 68,7 MPa (700

kgf/см ) upon the customer’s request. 2. For Strength Grade D pipes with short triangular thread, if the estimated pressure exceeds 24,5 MPa (250 kgf/cm ), the test pressure is set at 24,5 MPa (250 kgf/cm ). 3. Upon agreement between the manufacturer and the customer, the test pressure may be set at the estimated pressure value ( ), but not more than 122,6 MPa (1250 kgf/cm ).

(Amended, Revision 2). 2.13. Basic parameters and sizes of triangular-threaded pipe and coupling joints 2.13.1. The shape and size of the thread profile of pipes and couplings shall meet the values shown in Sketch 5 and Table 12. 2.13.2. The size of short triangular thread joints shall be as specified in Sketch 6 and Table 13 and for long triangular thread joints those specified in Sketch 6 and Table 14. 2.13.3. Maximum deviations from nominal thread sizes shall be as specified in Table 15. 2.13.4. Tightness of galvanized or phosphated coupling measured by a thread gage plug shall be equal to Tightness A (see Sketch 7 and Tables 13 and 14) accepted for manual screwing of couplings with pipes. Maximum tolerances ±3,2 mm.

Coupling

Pipe

* Reference Dimensions: 1 – Line Parallel to Tread Axis; 2 – Thread Effective Diameter Line; 3 – Thread Axis Sketch 5 Table 12

Dimensions, mm Tread Parameters Pitch, Original Profile Height, Н* Profile Height, Effective Profile Height, Profile Angle, Profile side angle tip, Rounded radius of: - Profile top, - Profile bottom, Gap Pitch Angle Obliquity 0,508 0,432 0,076 1°47’24" 1:16 /2 Standard 3,175 2,750

1,810 1,734 60° 30°±1°15’

Notes: 1. Thread pitch shall be measured parallel to the pipe and coupling thread axis.

2. Tolerances of radius values r and r1 are given to design threading tool and they are not a subject for control.

Manual Joint Screwing

Machine Joint Screwing

Coupling Pipe

Coupling

Pipe

_____________ * Reference Dimensions 1 – End of Thread Runout; 2 – Truncated Threads; 3 – Base Plane; 4 – Effective Thread Diameter Line; 5 – Thread Runout (10 max) Sketch 6

(расстояние от измерительной плоскости калибра-кольца до торца трубы) as 2.13.5. Tightness of pipe thread measured by a thread ring gage shall be equal to values specified in Sketch 7 and Tables 13 and 14. Maximum tolerances - ±3,2 mm. 2.13.6. For manual screwing of galvanized or phosphated couplings and pipes the tightness shall be equal to value A (see Sketch 6 and Tables 13 and 14). Maximum tolerances are ± 3,2 mm. It is permissible to select couplings and pipe ends by tightness of fit. Table 13

Short Triangular Thread Pipe and Coupling Joints
mm

Effective Nominal Outside Wall Pipe Pipe Thickness Thread Thread Diameter Diameter in Pipe End Face Diameter Diameter in Basic Plane Plane

Pipe Thread Length

Coupling Thread Cylindrical Cutout Inside Diameter Diameter in Coupling End Face Plane

Distance from Width of Coupling End coupling end to Face end of thread runout on pipe for manual screwing: tightness A

Distance Pipe from pipe Thread end to middle of Tightness coupling in completed joint A

Outside Inside

to Total (to end base plane of runout) (with perfect (dev. thread) ±3,2)

Nominal Tolerance. Design Design A B

114 114 127 127 140 146 168 178 178 194 219 219 245 273 273 299 324 340 406 473 508

114,3 114,3 127,0 127,0 139,7 146,1 168,3 177,8 177,8 193,7 219,1 219,1 244,5 273,1 273,1 298,5 323,9 339,7 406,4 473,1 508,0

5,2 5,7-8,6 5,6 6,4-9,2 6,2-10,5 6,5-10,7 6,5-12,1 5,9 6,9-13,7 7,6-12,7 6,7 7,7-14,2 7,9-13,8 7,1 8,9-16,5 8,5-14,8 8,5-14,0 8,4-15,4 9,5-16,7 11,1

112,566 112,105 108,485 112,566 111,136 107,516 125,266 124,023 120,403 125,266 123,617 119,997 137,966 136,130 132,510 144,316 142,292 138,672 166,541 164,298 160,678 176,066 175,011 171,391 176,066 173,823 170,203 191,941 189,511 185,891 217,341 215,317 211,697 217,341 214,723 211,103 242,741 240,123 236,503 271,316 269,667 266,047 271,316 268,480 264,860 296,716 293,880 290,260 322,116 319,280 315,660 337,991 335,155 331,535

51,0 66,5 63,5 70,0 73,0 76,0 79,5 60,5 79,5 82,5 76,0 85,5 85,5 70,0 89,0 89,0 89,0 89,0

35,125 111,230 50,625 111,230 47,625 123,930 54,125 123,930 57,125 136,630 60,125 142,980 63,625 165,205 44,625 174,730 63,625 174,730 66,625 190,512 60,125 215,912 69,625 215,912 69,625 241,312 54,125 269,887 73,125 269,887 73,125 295,287 73,125 320,687 73,125 336,562

116,7 116,7 129,4 129,4 142,1 148,4 170,7 180,2 180,2 196,1 221,5 221,5 246,9 275,5 275,5 300,9 326,3 342,1 408,8 475,5 510,4 +1,5 +0,8

3,0

28,0 12,5

18,7 3,2 9,7 3,2 3,2 3,2 3,2 22,2 3,2 3,2 12,7 3,2 3,2 22,2 3,2 3,2 3,2 3,2 3,2 3,2 3,2

4,0

6,0

19,0 12,5

3,5 6,5 6,0 9,5

12,5 12,5 12,5 31,5

4,5 7,5

6,5

12,5 12,5 22,0 12,5

8,5

12,5 31,5 12,5 11,0 12,5 12,5 12,5 12,5

9,0 8,5

404,666 401,048 397,428 101,5 85,625 403,237 471,341 467,723 464,103 101,5 85,625 469,912

13,0 8,5

12,5 12,5

11,1-16,1 506,266 502,648 499,082 101,5 85,625 504,837

Note: 1. The end of a thread runout is the end of that side of the groove of the running-out thread that is most remote from the pipe end face. 2. Female cone is allowed on the end of the coupling the generatrix of which is parallel to the generatrix of thread cone. The

least diameter of female cone shall be equal to d0 of the cylinder. 3. Minimum wall thickness under the thread in the plane of the pipe end is calculated with the following formula: (rounded up to 0.1 mm), Where - nominal pipe wall thickness, mm;

- nominal outside pipe diameter, mm; - inside thread diameter as measured in the plane of a pipe end, mm; - a factor that takes into account the value of the maximum deviation from the outside pipe diameter; =1,0075 – for all nominal pipe diameters (Design A); =1,01 – for pipes with a nominal diameter up to 219 mm (Design B); =1,0125 – for pipes with a nominal diameter over 219 mm (Design B). If the value of calculated by the above-mentioned formula is less than 1.5 mm, then the minimum wall thickness under the thread as measured in the plane of a pipe end shall be equal to 1.5 mm. 4. Threaded connections of pipes with nominal diameters of 351, 377 and 426 mm shall be made as per specifications approved in the established procedure. (Amended, Rev. 2 and 4). Table 14

Long Triangular Thread Pipe and Coupling Joints (U)
mm Nomin al Pipe Diame ter Outsid Effective e Pipe Thread Thread Diameter Diamet Diameter in Pipe End Plane in Base er Plane Pipe Thread Length Inside Thread Diameter in Coupling End Plane Coupling Cylindrical Cutout Diameter

Outside

Inside

Total (to To Base End of Plane (with Perfect Runout) (Deviation. Thread) ±3,2) 76,0 85,5 89,0 95,0 98,5 101,5 105,0 60,125 69,625 73,125 79,125 82,625 85,625 89,125 111,230 123,930 136,630 142,980 165,205 174,730 190,512

Distance from coupling Width of Coupling End face to end of thread runout Face on pipe for manual screwing (Tightness) А Nomina Max Design Design l. Dev. А B

114 127 140 146 168 178 194

114,3 127,0 139,7 146,1 168,3 177,8 193,7

112,566 125,266 137,966 144,316 166,541 176,066 191,941

110,542 106,922 122,648 119,028 135,130 131,510 141,105 137,485 163,111 159,491 172,448 168,829 188,105 184,485

116,7 129,4 142,1 148,4 170,7 180,2 196,1 +0,8

3,0 4,0 3,5 6,5 6,0 4,5/6,5 7,5 9,5 6,0

219 245

219,1 244,5

217,341 242,741

212,911 209,291 237,936 234,316

114,5 120,5

98,625 104,625

215,912 241,312

221,5 246,9

+1,5

8,5

11,0

Note: 1. The end of a thread runout is the end of that side of the groove of the running-out thread that is most remote from the pipe end face.. 2. Female cone is allowed on the end of the coupling the generatrix of which is parallel to the generatrix of thread cone. The least diameter of female cone shall be equal to d0 of the cylinder. 3. The minimum wall thickness under the thread as measured in the pipe plane (t) is calculated with the formula specified in calculated with the above-mentioned formula is less than 1.15 mm, then the Note 3 to Table 13. If the value of minimum wall thickness under the threat as measured in the plane of a pipe end shall be made equal to 1,5 mm. (Amended, Rev. 2 and 4).

For Short Thread

For Long Thread

___________ * Reference Dimensions 1 – measuring face of thread ring gage; 2 – thread ring gage; 3 - pipe; 4 – thread gage plug; 5 - coupling; 6 – measuring face of gage plug Sketch 7 2.13.7. After a pipe and a coupling are screwed together using a machine, the coupling face shall coincide with the end of

a thread runout on the pipe (see Sketch 6). Maximum deviation ±3,2 mm. 2.14. Basic parameters and dimensions of trapezoidal thread OTTM pipe joints with couplings for them. 2.14.1. The shape and dimensions of thread profile for pipes and couplings shall be as specified in Sketch 8 and Table 16. 2.14.2. The dimensions of threaded connections shall be as specified in Sketch 9 and Table 17. 2.14.3. Maximum tolerances of nominal thread dimensions shall be as specified in Table 18. Table 15 mm Maximum Tolerance Thread Pitch Along 25,4 mm Length ±0,075 Throughout Whole Thread Length with Full Profile ±0,150 Pipes Thread Obliquity Couplings

+0,36 -0,22

+0,22 -0,36

Notes: 1. The thread pitch tolerances on the length of 25.4 mm or less are allowed for the distance between any two

threads with full profile. For distance between threads more than 25.4 mm the tolerances can be increased proportionally to the increase of the distance, but they shall not exceed the values shown in the Table for the whole length of thread with full profile.
2. Obliquity tolerances (difference between two diameters) are accepted on the thread length 100 mm and they

refer to medium thread diameter of pipe and coupling as well as to outside diameter of pipe thread and inside diameter of coupling thread.

Table 16 Dimensions, mm Thread Parameter Thread Pitch, Profile Height, Standard 5,08 1,60±0,03 13°

Profile Angle, Profile Side Angle Tip: ±1° (Design А) 3° ±1° 30’ (Design B) ±1° (Design А)

10° ±1° 30’ (Design B) Profile Top Width Profile Bottom Width Profile Rounded Radius: 0,20 0,80 0,20 0,80 Pitch Angle Obliquity _____________ * Reference Dimensions: Notes: 1. Thread pitch is measured parallel to the pie and coupling thread axis. 1°47’24’’ 1:16 2,29

2,43

2. All tolerances and thread profile elements except for tolerances for pitch angle and profile height are given to

select threading tool and are not subject for control.

OTTM and OTTG Coupling and TBO Pipe Flared End

OTTM and OTTG Pipe and TBO Pipe Pin End

_____________ * Reference Dimensions 1 – Axis of OTTM and OTTG Coupling Thread and TBO Pipe Flared End; 2 – Line Parallel to Axis of OTTM and OTTG Coupling Thread and TBO Pipe Flared End; 3 – Axis of OTTM and OTTG Pipe Thread and TBO Pipe Pin End; 4 – Line Parallel to Axis of OTTM and OTTG Pipe Thread and TBO Pipe Pin End Sketch 8 2.14.4. When gaging the tightness of a pipe thread using a threaded or a plain ring gage, the measuring surface of the ring gages shall match the coupling end or fall short of the coupling end by no more than 2.5 mm (Sketch 10). 2.14.5. Tightness of galvanized or phosphated coupling thread as measured by a threaded plug gage shall be equal to 12 mm, while the measuring face of a plain gage plug shall be flush with a coupling end or sink relative to the coupling end by no more than 2.5 mm (Sketch 10).

For Normal Couplings

For Special Couplings

___________ * Reference Dimensions. 1 – End of Thread Runout; 2 – Truncated Threads; 3 – Basic Plane; 4 – Thread Runout (13 max) Sketch 9 2.14.6. When manually screwing galvanized or phosphated couplings with pipes, the tightness shall be equal to (14±3) mm (Sketch11). It is permissible to match couplings and pipe ends by tightness. 2.14.7. After a pipe and a coupling are screwed together using a machine, the coupling end shall coincide with the end of a thread runout on the pipe or fall short of it by no more than 5 mm (see Sketch 11).

Table 17

Trapezoidal Thread Pipe and Coupling Joints (OTTM)
mm Thread Thread Diameter Inside Pipe Pipe Nominal Outside Diameter in Pipe End Plane Diameter Diameter in Base Plane Pipe Thread Length Bevel Thread Full Inside Diameter in Profile Diameter Coupling Thread End Plane Length in Coupling (Toler. End Plane +1) Coupling End Face Width

Outside

Inside

Total (to To Base Plane End of (with Thread Full Runout) (Tol. Profile) ±2) 74 76 80 80 84 88 92 98 98 98 98 98 98 42 44 48 48 52 56 60 66 66 66 66 66 66 112,225 124,925 137,625 143,975 166,200 175,725 191,600 217,000 242,400 270,975 296,375 321,775 337,650 116,5 129,2 141,9 148,3 170,5 180,0 195,9 221,3 246,7 275,3 300,7 326,1 342,0 76 78 82 82 86 90 94 100 100 100 100 100 100

Design Design A B

114 127 140 146 168 178 194 219 245 273 299 324 340

114,3 127,0 139,7 146,1 168,3 177,8 193,7 219,1 244,5 273,1 298,5 323,9 339,7

111,100 123,800 136,500 142,850 165,075 174,600 190,475 215,875 241,275 269,850 295,250 320,650 336,525

111,675 108,475 124,250 121,050 136,700 133,500 143,050 139,850 165,025 161,825 174,300 171,100 189,925 186,725 214,950 211,750 240,350 237,150 268,925 265,725 294,325 291,125 319,725 316,525 335,600 332,400

3,0 4,0 3,5 6,5 6,0 4,5 7,5 9,0 6,5 6,0

8,5

9,5 8,5

Notes: 1. The end of a thread runout is the end of that side of the groove of the running-out thread that is most remote from the pipe end face. 2. Minimum wall thickness under the thread as measured in the plane of a pipe end ( ) is calculated with the formula specified in Note 3 to Table 13. 3. Size applies only to normal couplings.

4. Thread bevel height as measured in the plane of a pipe end shall be equal to 2 mm. (Amended, Rev. 2).

Table 18 mm Maximum Tolerances Thread Pitch Design Along 25,4 mm Length Pipes Thread Obliquity Couplings

Throughout Nominal Diameter Nominal Nominal Nominal whole thread up to 194 mm Diameter Over Diameter up to Diameter length with full inclusive 194 mm 194 mm Inclusive Over 194 mm profile +0,25 +0,25 -0,10 +0,30 -0,20 -0,25 +0,20 -0,30 +0,10 -0,25

A ±0,05 B ±0,10

(Amended, Rev. 4).

1 – Measuring Face of Threaded and Plain Ring gages; 2 – Threaded and Plain Ring gages; 3 - Pipe; 4 – Threaded Gage Plug; 5 – Plain Gage Plug; 6 - Coupling; 7 – Measuring Face of Threaded Gage Plug; 8 – Measuring Plane of Plain Gage Plug Sketch 10

1 – End of Thread Runout; 2 – Machine-Screwed Joint; 3 – Manually-Screwed Joint Sketch 11 2.15. Основные параметры и размеры высокогерметичных соединений труб и муфт к ним - ОТТГ 2.15.1. The shape and dimensions of threaded joints shall be as shown in Sketch 8 and Table 16. 2.15.2. Dimensions of supertight joints shall be as shown in Sketch 12 and Table 19. 2.15.3. Tolerances of nominal dimensions of threads shall be as shown in Table 20. 2.15.4. Obliquity tolerances throughout the whole length of a pipe conical seal bank and a coupling female seal cone shall be ±0,03 и +0,06 mm respectively. 2.15.5. When gaging thread tightness using threaded and plain ring gages, the measuring face of the ring gages shall be placed within 24 mm of pipe end (Sketch 13).

2.15.6. Tightness of galvanized or phosphated coupling thread as measured by a threaded plug gage shall be equal to 8 мм (Sketch.13), while the measuring face of a plain gage plug shall be sunk relative to the coupling end by 4,0 to 6,5 mm (Sketch 13). 2.15.7. When gaging the diameter of a pipe seal cone band, the measuring face of a plain ring gage shall match the pipe end or fall short of it by no more than 1.6 mm (Sketch13). 2.15.8. When gaging the diameter of a galvanized or phosphatized coupling cone seal cutout, the measuring face of the plain gage plug shall be placed at the distance 13). (see Table 19) form coupling end. Tolerances mm (see Sketch

For Normal OTTG Couplings

I (for Special OTTG Couplings and Flared Ends of TBO Pipes)

No Wire Edges Allowed

____________ * Reference Dimensions 1 – End of Pipe Runout; 2 – Truncated Threads; 3 – Basic Plane; 4 – Thread Runout (13 max); 5 – Full Profile Thread Length; 6 – Measurement Plane; 7 – Thread Runout Sketch 12 Note: Normal OTTG Couplings are allowed to have bevelling (35±5)° replaced with a rounded radius not exceeding the beveling in width

Table 19
Supertight OTTG Pipe and Coupling Joints and Slip-Joint Flush-Joint TBO Pipes mm OTTG Pipe and TBO Pipe Pin-End Pipe Pipe Nominal Outside Dia Dia Thread Inside Diam in Base Plane Seal Cone Thread Band Dia in Diameter in Pipe End Face Plane End Plane Distance from Distance from Face to End of Face to Base Thread Runout Plane (Tolerance - 1) Seal Cone Cutout Diameter in Assumed Plane Thread Inside Diameter in Face Plane OTTG Coupling and TBO Pipe Flared End Bevel Diameter in End Face Plane (Tolerance +1) Distance from End Face to Thrust Shoulder (Tolerance. +1) Distance from Threaded End Face to Cone Assumed Length Plane (Tolerance -1) Design A 114 127 140 146 168 178 194 219 245 273 114,3 127,0 139,7 146,1 168,3 177,8 193,7 219,1 244,5 273,1 111,100 123,800 136,500 142,850 165,075 174,600 190,475 215,875 241,275 269,850 110,175 122,750 135,200 141,550 163,525 172,800 188,425 213,450 238,850 267,425 106,375 118,950 131,400 137,750 159,725 169,000 184,625 209,650 235,050 263,625 98 100 104 104 108 112 116 122 122 122 66 68 72 72 76 80 84 90 90 90 106,425 119,000 131,450 137,800 159,775 169,050 184,675 209,700 235,100 263,675 112,475 125,175 137,875 144,225 166,450 175,975 191,850 217,250 242,650 271,225 116,5 129,2 141,9 148,3 170,5 180,0 195,9 221,3 246,7 275,3 96 98 102 102 106 110 114 120 120 120 88 90 94 94 98 102 106 112 112 112 82 84 88 88 92 96 100 106 106 106 72 74 78 78 82 86 90 96 9,0 96 96 8,5 4,5 7,5 4,0 6,0 3,5 6,5 6,0 6,5 Design B Full Profile Thread Length End Face Width

3,0

_ * Reference Dimensions.
Notes: 1. The end of a thread runout is the end of that side of the groove of the running-out thread that is most remote from the OTTG pipe end face and the TBO Pipe Pin End. 2. The end of a thread runout of an OTTG coupling and the flared end of a TBO pipe may be located on a bevel between the thread and the seal cone. 3. Minimum wall thickness of a seal cone bank as measured in the plane of the OTTG pipe end face and the TBO pipe pin end ( ) shall be calculated with the formula specified in Note 3 to Table 13. The value is

calculated witht he formula is less than 3.0 mm, then the value t is set at 3.0 mm. For Design A 219, 245 and 273 mm assumed to be the diameter of the seal cone band as measured in the end face plane. If the value pipes with 8.9 mm wall thickness and Design B 245х10 mm and 273х10,2 mm pipes this value is set at 2.5 mm. 4. (Deleted, Rev. 4). 5. Dimension applies only to normal couplings for OTTG pipes.

(Amended, Rev. 2 and 4).

___________

Table 20 Dimensions, mm Maximum Tolerance Pitch Thread Design Along 25,4 mm Length Pipe Thread Obliquity Coupling

Throughout Nominal Nominal Nominal Nominal whole thread Diameter up to Diameter Over Diameter up to Diameter Over length with full 194 mm 194 mm 194 mm 194 mm profile inclusive. Inclusive +0,15 +0,20 -0,05 +0,30 -0,20 -0,15 +0,20 -0,30 +0,05 -0,20

А ±0,05 Б ±0,10

(Amended, Rev. 4).

1 – Measuring Plane of Threaded and Plain Ring gages; 2 – Threaded and Plain Ring gages; 3 – OTTG Pipe and TBO Pipe Pin End; 4 – Threaded Gage Plug; 5 – Plain Gage Plug; 6 – OTTG Coupling and TBO Pipe Flared End; 7 – Measuring Plain of Threaded Gage Plug; 8 – Measuring Plane of Plain Gage Plug; 9 – Plane Ring gage; 10 – Measuring Plane of Plain Ring gage Sketch.13

2.15.9. When manually screwing galvanized or phosphated couplings with pipes, the tightness shall be 10±2 mm (Sketch 14). It is permissible to select couplings and pipe ends matching by tightness. 2.15.10. After machine screwing of pipe and coupling together, the pipe end and the thrust ledge of the coupling shall be connected tightly together throughout the whole perimeter of the thrust surfaces (see Sketch 14). The gap between the thrust surfaces of pipe and coupling shall not be higher than 1 mm (for Design B).

1 – End of Thread Runout; 2 – Manually Screwed Joint; 3 – Machine-Screwed Joint Sketch14 2.15.11. Pipe ends and coupling thrust ledges shall be perpendicular to the thread axis. Perpendicular tolerance: - 0,06 mm. Evenness tolerance along the thrust surfaces - 0,06 mm. 2.15.12. Axes of threads and sealing conic surfaces of pipes and couplings shall match. Axiality tolerance - 0,04 mm. 2.16. Основные параметры и размеры соединений труб безмуфтовых раструбных ТБО 2.16.1. The shape and dimensions of pin and flared ends of pipes shall meet the values shown in Sketch 8 and Table 16. 2.16.2. Размеры соединений должны соответствовать указанным на черт.12 и в табл.19. 2.16.3. Tolerances of nominal sizes of threads shall meet the values shown in Table 21. 2.16.4. Obliquity tolerances throughout the whole length of the seal band of pin end and seal bore of the flared end of pipe are: ±0.03 and +0.6 mm respectively. Table 21 mm Maximum Tolerance Pitch Thread 25,4 mm Length ±0,05 Throughout Full Profile Thread Length ±0,10 Pitch Obliquity Pipe Pin End +0,15 Pipe Flared End -0,15

Notes: 1. See Note 1 to Table 15. 2. Obliquity tolerances (difference between two diameters) are accepted on the thread length 100 mm and they

refer to thread outside and inside diameters of pin- and flared pipe ends. Pin end inside thread diameter obliquity is checked all along the length of the full profile thread and the truncated thread (to the beginning of a
thread runout).

(Amended, Rev. 3).

2.16.5. The thread tightness of the pin and flared end shall be measured as described in Items 2.15.5 and 2.15.6. 2.16.6. The diameter of sealing conic bore of the pipe flared and pin ends shall be measured as described in items 2.15.7 and 2.15.8. 2.16.7. The ends of the pipe and the thrust ledge at the flared end of the pipe shall be perpendicular to the thread axis.. Perpendicularity tolerance shall be 0,06 mm. Evenness tolerance along the thrust surfaces shall be 0.06 mm. 2.16.8. Axes of threads and sealing conic surfaces of pipes and pin and flared ends shall match. Axiality tolerance: 0.04 mm. 2.16.9. It is not permissible to have a difference between the maximum and the minimum width of a thrust ledge of the flared pipe end more than 2 mm. 2.16.10. It is not permissible to have a wall thickness difference more than 2 mm at the flared end of a pipe. 2.17. Axes of threads of both ends of coupling shall match. Axiality tolerance: 0,75 мм on the end plane and 3 mm on the length of 1 m. 2.18. It is not permissible to have a wall thickness difference more than 1 mm at the end of special small diameter couplings for OTTM and OTTG pipes. 2.19. Surfaces of threads, sealing conic surfaces, thrust ends and ledges of pipes and couplings and conic bores shall be flat, without wire-edges, scabs, and other defects affecting their continuity and strength as well as integrity of the joint. Roughness parameter (Rz) of the thread surface under GOST 2789-73 shall not be higher than 20 ?m. 2.20. For triangular thread pipes, threads with scales on the thread tops are not allowed on a distance less than ( - 13) mm - 10)

from the pipe end.. For OTTM, OTTG and TBO pipes, scaled threads are not allowed on a distance less than (

mm from the pipe end all along the pipe circumference. On the length of ( - 10) mm it is permissible to have scales on one thread for pipes up to 194 mm and two threads for 219 mm and larger diameter pipes, but no more than the total of 25% of the length of the circumference for each thread. (Amended, Rev. 4). 2.21. To provide an exit for a thread-cutting tool, a groove may be made in the middle of couplings for triangular thread and OTTM pipes, cut to a depth that shall not exceed the profile height any sharp edges (undercuts). by more than 0,5 mm. The groove shall not have

If there is no groove, there may be a cutover of counter-threads in the middle of a coupling: for triangular thread pipes – at a distance no more than 9 mm from the middle of the coupling both sides; for OTTM pipes – on a length of an incomplete profile thread. 2.22. (Deleted, Rev. 4).

3. ACCEPTANCE RULES
3.1. Pipes shall be submitted for inspection in batches. A batch shall consist of pipes of the same nominal diameter, same wall thickness and strength grade, same type and same design, and the batch shall be accompanied with a single document certifying compliance of their quality with the requirements of this standard. This document shall contain the following details: Trademark or Manufacturer and Trademark; Nominal diameter of pipes and wall thickness in millimeters, pipe length in meters, and pipe mass in kilograms; Joint type; Design Type (for Design A pipes); Strength grade, heat #, mass content of sulfur and phosphorus for all heats included in the batch; номера труб (от - до для каждой плавки); Test results; Reference to this standard. (Amended, Rev. 1). 3.2. Each pipe and each coupling of a certain batch shall undergo visual inspection, checkup of sizes of defects and geometry dimensions and other parameters in addition to those parameters specified in this item below Thread pitch (on a length of 25.4 mm and throughout the whole length), angles of profile sides, obliquity by the effective diameter of triangular thread, obliquity by the inside diameter of the external trapezoidal thread and the outside diameter of the internal trapezoidal thread, perpendicularity and evenness of thrust threfaces, axiality of threads and sealing conic surfaces of OTTG pipe and coupling and TBO pipe joints, and the width of a thrust ledge of the flared end of TBO pipes, linear and angular dimensions as shown in Sketches 6, 9 and 12 and Tables 13, 14, 17, and 19 shall be checked periodically within scopes and periods as agreed between the manufacturer and the customer. At least 1% of pipes of each batch shall undergo thread axiality checkup. (Amended, Rev. 3). 3.3. Every joint of the batch shall undergo quality checkup of fitness of OTTG pipe and thrust ledge of coupling. 3.4. Checkup of mass shall be performed for each pipe of design A and B. It is allowed not to check mass of design B pipes. In this case the pipes shall be accepted by the actual fabricated mass. Couplings shall be accepted by actual fabricated mass. (Amended, Rev. 3). 3.5. The mass content of sulfur and phosphorus shall be checked for each heat. For the pipes manufactured out of metal of some other company, the mass content of sulfur and phosphorus shall be documented in the metal manufacturer certificate. 3.6. To check the mechanical properties of metal, one pipe and one coupling rough part of each size shall be selected from each heat. 3.7. For flattening test one pipe of each size shall be selected from each heat. 3.8. Each pipe with a screwed-on coupling as well as each TBO pipe shall undergo internal hydraulic pressure test. It is permissible to hydrotest at least 50% of a pipe batch of Design B short/triangular thread pipes 245 mm and more in

diameter and then apply the results to the entire batch. It is allowed to test TBO pipes prior to threading after thermal treatment. 3.9. To detect longitudinal defects, pipes and couplings (coupling workpieces) shall be subjected to non-destructive ultrasonic or magnetic induction testing. NDT testing to detect any longitudinal defects shall be performed on each pipe of any strength grades of Design A and any pipes of Strength Grade E and a higher grade of Design B. At customer’s request, all Design B strength grades and Design A Strength Grade D may be supplied without any non-destructive testing. (Amended, Rev. 4). 3.10. In case of unsatisfactory results of tests at least for one of the parameters, a repeated test shall be performed for this parameter on double the number of samples from the same batch. Repeated test results shall apply to the whole batch. 3.11. Tightness check of manually-screwed pipes and couplings (Item 2.13.6, 2.14.6, 2.15.9) shall be performed only if the customer’s order is to supply pipes with couplings screwed on manually. 3.12. Coupling thread tightness check may be performed before galvanizing or phosphating the thread. 3.11, 3.12. (Added, Rev. 4).

4. TESTING METHODS
4.1. External and internal surfaces of pipes and couplings shall be inspected visually. 4.2. Depth of defects shall be inspected by notching or any other methods in one-three locations. 4.3. Geometrical dimensions and parameters of pipes and couplings shall be inspected with multipurpose measuring tools or special devices ensuring high enough accuracy of measurements in accordance with duly approved technical documentation. 4.4. Pipe inside diameter shall be inspected throughout the whole length of the pipe using a double rigid gage or a straight plug sized as shown in Table 22. Table 22 Dimensions, mm Pipe Nominal Diameter 114-219 245-340 351-508 ____________ * - Nominal internal pipe diameter. For pilger mill pipes with 245-340 mm nominal diameter and TBO pipes of all diameters, it is permissible to reduce the diameter of the gage (plug) by 1 mm. Gage/plug diameter tolerance shall be +0,25 mm. 4.5.Bend of the end parts of pipe shall be identified based on the bend deflection size and calculated as ratio of bend deflection in millimeters to the measuring distance to the closest end of pipe in meters. Gage/Plug Length 150 300 300 Gage/Plug Diameter -3 -4 -5

When measuring the bend of TBO pipes, the length of the upset part of the flared end shall not be included into the calculation. 4.6. Obliquity of the outside diameter of pipe thread and pin end thread of TBO pipes and of the inside diameter of coupling thread and TBO pipe flared end, as well as the obliquity of sealing conical surfaces on OTTG pipes and couplings and TBO pipes shall be measured with plain conic gages (rings and plugs, full or not full) or special devices. 4.7. Inspection of wall thickness under the thread (t) shall be performed on the root of the first thread located from the side of the pipe end. 4.8. To check alignment of threads axes of both ends the coupling shall be screwed on the threaded cylinder rod calibrated and aligned in the spin chuck or a special device. The other cylinder finished rod at least 250 mm long shall be screwed on the free end of the coupling. While spinning the coupling, the value of bouncing (double value of axiality deviation) of the rod at the coupling end and at the end of the rod shall be measured with clock-type indicator with scale factor 0.01 mm. Value of bouncing at the end of the rod shall be measured from the middle of the coupling. 4.9. Thread tightness of triangular thread pipe shall be gaged with a threaded ring gage. 4.10. Thread tightness of triangular thread couplings shall be gaged with a threaded plug gage. 4.11. Thread tightness of OTTM/OTTG pipes and flared ends of TBO pipes shall be gaged with plain and threaded ring gages. 4.12. Thread tightness of couplings for OTTM and OTTG pipes and flared ends of TBO pipes shall be gaged with plain and threaded plug gages. 4.13. The diameter of sealing conic joint surfaces of OTTG pipes and couplings fro them as well as TBO pipes shall be gaged by plain conical gages (plugs and rings). 4.14. When checking the fitness of the end of an OTTG pipe with the thrust ledge of a coupling, a plate gage 0.03 mm thick (for Design A pipes) and 1 mm thick (for Design B pipes) shall not go through along the entire perimeter of the joint. 4.15. Mass of Design A and B pipes shall be checked with special weighing devices, accuracy of which meet the requirements hereof. 4.16. To identify mass content of sulfur and phosphorus, samples shall be taken during heating as per GOST 7565. 4.17. Stretching test shall be performed in accordance with GOST 10006-80 on short longitudinal samples. To check the mechanical properties of metal, one sample shall be cut out of each selected pipe and coupling. The samples shall be cut out of any end of the pipe and coupling using methods, which do not alter structure and mechanical properties of metal. Samples of TBO pipes shall be cut out of the upset part of the flared end. It is allowed to straighten ends of the sample to so that the testing machine can grip it. It is permissible to test the mechanical properties of Strength Grade D pipes with NTD tesign in keeping with engineering regulations. If any differences, the testing shall be performed in keeping with GOST 10006. (Amended, Rev. 4). 4.18. Flattening test shall be performed per 8695 on ring samples (60±5) mm wide, to be cut out of both ends of each selected finished pipe (or prior to threading). TBO samples shall be cut out of the plain part of pipe. It is allowed to have bevel not bigger than 1x45 on the ring samples. When testing samples of pipes of grade K and higher the early formation of cracks or tears are allowed in the plane of the bigger bend of the sample (along the line of strength application). 4.19. Duration of hydraulic pressure test shall be not less than 10 sec.
0

During the test there shall be no leaks in the wall and thread of pipe and coupling. Pipes revealing leaks in joint shall be re-threaded and the test shall be repeated. 4.20. Inspection of pipe for lengthwise defects with non-destructive methods of inspection is described in the mandatory Exhibit 3.

5. MARKING, PACKING, TRANSPORTATION AND STORAGE
5.1. Marking, packing, transportation and storage shall meet the requirements of GOST 10692 and the following additional requirements: 5.1.1. The following markings shall be clearly pricked or knurled on each pipe with a coupling within 0.4-0.6 mm from its end Pipe nominal diameter in mm; Pipe No; Strenght Grade; Wall thickness in mm; Trademark of Manufacturer’s Name and Trademark; Month and year of manufacture Marking area shall be encircled or underlined with a permanent light color. Height of marking symbols shall be 5-8 mm. In case of mechanical marking, the legend may be located in one row. It is allowed to mark heat No. on each pipe. (Amended, Rev. 1). 5.1.2. A marking with light permanent color containing the details enlisted below shall be put on the pipe next to the pricked or knurled marking:: Pipe nominal diameter; Strength grade; Wall thickness in mm; Pipe length in cm; Pipe mass in kg (to be marked after identification of mass); Joint type (except for triangular-thread pipes); Design (for Design A pipes); Trademark or Manufacturer’s Name and Trademark. Height of marking symbols shall be 35-60 mm. (Amended, Rev. 1 and 2). 5.1.3. Each coupling shall have pricked or knurled clear marking of manufacturer’s trademark, strength group, the letter S for special couplings for OTTM and OTTG pipes and coupling design (for Design A couplings). 5.1.4. All marking symbols shall be applied along the generatrix of pipe and coupling. It is allowed to knurl marking symbols

perpendicular to the generatrix . (Amended, Rev. 4). 5.1.5. Thread, thrust ends and ledges as well as sealing conic surfaces of pipes and couplings shall be protected from damage with special metal preserving rings and plugs. Rings shall cover joints of pipes and pin ends of TBO pipes on the length L minus 3 threads. Pins shall cover joints of couplings and flared joints of TBO pipes on the length of at least 2/3 of L. All rings and pins shall merge outside the pipe and couplings edges by at least 10 mm. Structure of rings and pins shall allow to unscrew these rings and pins. When screwing rings and pins on, the thrust ends and ledges and sealing conic surfaces shall be coated with anti-corrosion grease. 5.1.6. One railway car should have pipes of one batch only. It is allowed to ship faggots with pipes from different batches in one railway car, provided they are separated, if a pipe batch or a remainder thereof do not match the capacity of a railway car. 5.1.7. Upon customer’s request, any pipes up to 210 mm in nominal diameter inclusive shall be transported in faggots securely bound in at least two places. Upon agreement between the manufacturer and the consumer, any pipes from 219 to 324 mm in nominal diameter inclusive shall be transported in faggots securely bound in at least three places. (Amended, Rev. 2). 5.1.8. A faggot shall include pipes from the same batch only. 5.1.9. Mass of a faggot shall not exceed 5 tons, (or 3 tons at customer’s request). In the bound faggots couplings and flared ends of TBO pipes shall point in the same direction.

EXHIBIT 3* Mandatory ___________ * Exhibit 1 and 2 (Deleted, Rev. 2).

NDT PIPE TESTING
Inspection of pipes for lengthwise defects shall be performed throughout the whole length of pipe prior to threading with non-destructive inspection equipment. Equipment sensitivity shall be adjusted with working sample fabricated out of plain part of pipe of controllable size and with artificial defects. Pipes, which did not pass non-destructive test shall be rejected as defective. It is allowed to repair rejected pipes with further repeated test. Design A Test sample shall have artificial defects, sizes of which are shown in the table below: Dimensions, mm Test Type Ultrasonic or Eddy Current Magnetic Induction

Artificial defect Notch with a rectangular profile on the Full-length hole in the Rectangular notches type outside surface parallel to sample axis wall perpendicular to sample axis On external surface parallel to sample axis Artificial defect type For all strength grades Length Depth in % of nominal wall thickness Width Diameter (Tolerance ±1,0) 1,6 Length Depth in % of nominal wall thickness Width

50 min

(5,0±0,75) but No more not less than than 1,0 (0,3±0,05) mm and 3-times surface roughness

50 min

(10±1,5) but not 0,3±0,05 less than (0,3±0,05) mm and 3-times surface roughness (10±1,5) but no 0,3±0,05 less than(0,6±0,05) mm and 3-times surface roughness

For strength grades D, E and L (as agreed between manufacturer and consumer)

Equals to double (12,5±2,0) but No more than 1,0 no less than width of (0,6±0,05) mm piezoelectric and 3-times plate of surface detecting head roughness

3,2

50 мин

Defects signal of which exceeds signal of flaw detector obtained during adjustment with test sample shall be considered critical; the pipe containing critical defects shall be rejected as defective. When adjusting by artificial defect with depth of 5% of the nominal wall thickness it is allowed to clean the revealed defects off provided the minimal allowed wall thickness is preserved. Ends of pipes which are not covered by automatic flaw detection equipment shall be inspected for pipe lengthwise defects on the outside and inside surfaces with magnetic powder or with any other flaw detection method, which ensures revealing of critical defects equivalent by size to the artificial defects shown in the Table. All pipes which passed flaw detection shall be additionally marked with symbol “O” encircling the value of strength grade. Also, the flaw detection results shall be recorded in the quality documents.

Upon customer’s request it is allowed to apply eddy current methods of flaw detection. Design B Pipes shall be inspected in accordance with the duly approved instruction. (Amended, Rev. 4).

GOST 632-80 S.69 1. DEVELOPED AND INTRODUCED by the USSR Ferrous Metallurgy Ministry and the Oil Industry Ministry.

DEVELOPED BY: A. Karkov (Project Manager), R. Fedosova, D. Polyachek (Project Manager), V. Pchelkin, V. Krasnova, N. Shcherbyuk (Project Manager), V. Yakubovsky, V. Buteynis 2. 3. 4. 5. APPROVED AND PUT INTO EFFECT BY RESOLUTION 2578 of the State Standards Committee dd 05/06/80. To be reviewed every 5 years SUPERCEDES GOST 632-64 REFERENCES TO REGULATIONS Referred Regulations GOST 2789-73 GOST 7565-81 GOST 8695-75 GOST 10006-80 GOST 10692-80 GOST 17410-78 2.19 4.16 4.18 4.17 5.1 Exhibit 3 Article, Exhibit

6. Validity Term extended till 01/01/93 by Resolution 174 dd 24/01/86 7. Reissued (September 1989) with Revisions 1, 2, 3 and 4 approved in October 1982, January 1986, June 1988 and May 1989 (IUS 2-83, 5-86, 4-88, 4-89)


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