STATE STANDARD OF THE USSR

FLANGES FOR VALVES, FITTINGS AND PIPELINES FOR Pnom from 0.1 to 20.0 MPa (from 1 to 200 kgf/sq.cm)

Types. Connecting dimensions and dimensions of sealing surfaces

GOST 12815—80

1. The present standard is related to flanges of pipelines and fittings, as well as conjunctive flanges of fittings,

machine fittings, fittings of instruments, pipe branches of devices and reservoirs at the nominal pressure Рnom from 0.1 to 20.0 MPa (from 1 to 200 kgf/sq.cm) and the environmental temperature from 20 to 873 К (from minus 253 to plus 600 °С) and to flanges with polytetrafluorethylene seals at the nominal pressure Рnom from 0.1 to 20.0 MPa (from 1 to 200 kgf/sq.cm) and the environmental temperature from 73 to 473 К (from minus 200 to plus 200 °C) and can be used for their certification.

The standard is not related to flanges of transport machine pipelines, if those flanges are not intended for conjunction of fittings or devices of general purpose, as well as the standardized flanges of GOST 1536-76 and GOST 4433-76.

Table 1

Flange type Nominal pressure Рnom,

MPa (kgf/sq.cm) Internal diameter

Dnom, mm Steel butt-welded acc. to 0.1; 0.25; 0.6 (1; 2.5; 6) 10—1600 GOST 12821-80 1.0; 1.6; 2.5; 4.0 (10; 16; 25; 40) 10-1200 6,3 (63) 10-400; 500-1200 10(100) 10-400 16 (160) 15-300 20 (200) 15-250

Design 1 a flange with a connecting lip

Variant (a square flange)

around the contour

n of holes with d

Drawing 1

Design 2 a flange with a raised face

Design 3 a flange with a female groove

Drawing 2

n of holes with d

n of holes with d

n of holes with d

n of holes with d

n of holes with d n of holes with d

Drawing 3

Drawing 4 Drawing 5

Design 4 a flange with a tongue

Design 5 a flange with a notch

Design 6 a flange for a lens

gasket

Design 7 a flange for an oval

ring gasket

Notes to drawings 1-6: 1. Processing of A surfaces with roughness Ra ≤ 100 micrometer is accepted. 2. Processing of Б surfaces with roughness Ra ≤ 25 micrometer is accepted if there is a circular lay. 3. It is acceptable to perform rounding instead of ∠ 45°.

n of holes with d

n of holes with d

Drawing 6

Design 8 Design 9

Table 4 Pnom 1.0 MPa (10 kgf/sq.cm)

Dimensions in mm Intern

al diame

ter, Dnom

D D1 D2 D3 D4 D5 D6 d n h h1 h2 B Nominal diameter of bolts or studs

row1 row2 row1 row2 row1 row2 row1 row2 row1 row2 row1 row2 row1 row2 row1 row2 row1 row2 10 90 60 42 24 34 23 35 14 14 4 4 2 4 4 3 3 70 М12 М12 15 95 65 47 29 39 28 40 14 14 4 4 2 4 4 3 3 75 М12 М12 20 105 75 58 36 50 35 51 14 14 4 4 2 4 4 3 3 80 М12 М12 25 115 85 68 43 57 42 58 14 14 4 4 2 4 4 3 3 90 М12 М12 32 135 100 78 51 65 50 66 18 18 4 4 2 4 4 3 3 105 М16 М16 40 145 110 88 61 75 60 76 18 18 4 4 3 4 4 3 3 110 М16 М16 50 160 125 102 73 87 72 88 18 18 4 4 3 4 4 3 3 125 М16 М16 65 180 145 122 95 109 94 110 18 18 4 4 3 4 4 3 3 140 М16 М16 80 195 160 133 106 120 105 121 18 18 8 4 3 4 4 3 3 150 М16 М16

100 215 180 158 129 149 128 150 18 18 8 8 3 4,5 4 3,5 3 ⎯ М16 М16 125 245 210 184 155 175 154 176 18 18 8 8 3 4,5 4 3,5 3 ⎯ М16 М16 150 280 240 212 183 203 182 204 22 22 8 8 3 4,5 4 3,5 3 ⎯ М20 М20

(175) 310 270 242 213 233 212 234 22 22 8 8 3 4,5 4 3,5 3 ⎯ М20 М20 200 335 295 268 239 259 238 260 22 22 8 8 3 4,5 4 3,5 3 ⎯ М20 М20

(225) 365 325 295 266 286 265 287 22 22 8 8 3 4,5 4 3,5 3 ⎯ М20 М20 250 390 350 320 292 312 291 313 22 22 12 12 3 4,5 4 3,5 3 ⎯ М20 М20 300 440 400 370 343 363 342 364 22 22 12 12 4 4,5 5 3,5 4 ⎯ М20 М20 350 500 460 430 395 421 394 422 22 22 16 16 4 5 5 4 4 ⎯ М20 М20 400 565 515 482 447 473 446 474 26 26 16 16 4 5 5 4 4 ⎯ М24 М24

(450) 615 565 532 497 523 496 524 26 26 20 20 4 5 5 4 4 ⎯ М24 М24 500 670 620 585 549 575 548 576 26 26 20 20 4 5 5 4 4 ⎯ М24 М24 600 780 725 685 649 651 675 677 648 650 676 678 30 30 20 4 5 5 6 4 5 ⎯ М27 М27

(700) 895 840 800 751 751 777 777 750 750 778 778 30 30 24 24 5 5 6 4 5 ⎯ М27 М27 800 1010 950 905 856 851 882 877 855 850 883 878 33 33 24 24 5 5 6 4 5 ⎯ М30 М30

(900) 1110 1050 1005 ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ 33 33 28 28 5 ⎯ ⎯ ⎯ ⎯ ⎯ М30 М30 1000 1220 1160 1110 ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ 36 33 28 28 5 ⎯ ⎯ ⎯ ⎯ ⎯ М30 М30

1200 1455 1380 1330 ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ 39 39 32 32 5 ⎯ ⎯ ⎯ ⎯ ⎯ М33 М30 1400 1675 1590 1530 ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ 42 45 36 36 5 ⎯ ⎯ ⎯ ⎯ ⎯ М36 М36 1600 1915 1820 1750 ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ 48 52 40 40 5 ⎯ ⎯ ⎯ ⎯ ⎯ М39 М42

(1800) 2115 2020 1950 ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ 48 52 44 44 5 ⎯ ⎯ ⎯ ⎯ ⎯ М45 М48 2000 2325 2230 2150 ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ 48 52 48 48 5 ⎯ ⎯ ⎯ ⎯ ⎯ М45 М48

Table 12 Dimensions in mm

Internal diameter Dnom

Рnom, MPa (kgf/sq.cm) Row D3, D5 D4, D6 h1 h2

Up to 0.63 1 19 31 (6.3) 2 18 30 10 Over 0.63 (6.3) 1; 2 23 35 up to 10 (100) Up to 0.63 1 24 36 15 (6.3) 2 22 34 Over 0.63 (6.3) 1 28 40 up to 20 (200) 2 Up to 0.63 (6.3) 1 31 47 20 2 32 44 Over 0.63 (6.3) 1; 2 35 51 up to 20 (200) 4 3 Up to 0.63 1 38 54 (6.3) 2 40 52 25 Over 0.63 (6.3) 1; 2 42 58 up to 20 (200) Up to 0.63 1 48 64 32 (6.3) 2 60 Over 0.63 (6.3) 1; 2 50 66 up to 20 (200) Up to 0.63 1 55 71 (6.3) 2 54 70 40 Over 0.63 (6.3) 1; 2 60 76 up to 20 (200) Up to 0.63 (6.3) 1 68 84 2 65 81 50 Over 0.63 (6.3) 1; 2 72 88 до 20 (200) Up to 0.63 (6.3) 1 88 104 65 2 85 101 Over 0.63 (6.3) 1; 2 94 110 up to 20 (200) Up to 0.63 (6.3) 1 102 118 80 2 100 116 Over 0.63 (6.3) 1; 2 105 121 up to 20 (200) Up to 0.63 (6.3) 1 122 144 100 2 116 138 Over 0.63 (6.3) 1; 2 128 150 up to 20 (200) Up to 0.63 1 148 170 125 (6.3) 2 145 167 Over 0.63 (6.3) 1; 2 154 176 up to 20 (200) Up to 0.63 1 175 197 150 (6.3) 2 170 192 Over 0.63 (6.3) 1; 2 182 204 up to 20 (200) Up to 0.63 (6.3) 1 205 227 (175) 2 202 224 Over 0.63 (6.3) 1; 2 212 234 up to 20 (200)

Up to 0.63 (6.3) 1 230 252 200 2 228 250 Over 0.63 (6.3) 1; 2 238 260 up to 20 (200) Up to 0.63 (6.3) 1 225 277 6 5 (225) 2 Over 0.63 (6.3) 1; 2 265 287 up to 20 (200) Up to 0.63 (6,3) 1 285 307 '250 2 282 304 Over 0.63 (6.3) 1; 2 291 313 up to 20 (200) Up to 0.63 (6.3) 1 335 357 300 2 Over 0.63 (6.3) 1; 2 242 364 up to 16 (160) Up to 0.63 (6.3) 1 380 408 350 2 385 407 Over 0.63 (6.3) 1; 2 394 422 up to 10 (100) Up to 0.63 (6.3) 1 430 458 400 2 435 457 Over 0.63 (6.3) 1; 2 446 474 up to 10 (100) Up to 0.63 (6,3) 1 480 508 450 2 488 510 Over 0.63 (6.3) 1; 2 496 524 до 4,0 (40) Up to 0.63 (6.3) 1 530 558 500 2 540 562 Over 0.63 (6.3) 1; 2 548 576 up to 6.3 (63) Up to 0.63 (6,3) 1 630 658 600 2 634 662 Over 0.63 (6.3) 1 648 676 up to 6.3 (63) 2 650 678- Up to 0.63 1 735 763 700 (6.3) 2 736 764 Over 0.63 (6.3) 1; 2 750 778 up to 4.0 (40) Up to 0.63 (6.3) 1; 2 840 868 800 Over 0.63 (6.3) 1 855 883 up to 4.0 (40) 2 850 878

(Revised version, Revisions 1, 3, 4, 5). 3. Tolerance bands of polytetrafluorethylene gasket sites in mating parts should correspond to those indicated in table 13. (Revised version, Revision 3).

4. It is accepted to manufacture flanges of other constructions with other designs of seal faces, including those with sealing grooves on the joggle or the welded ring, observing the connecting dimensions in accordance with tables 2-11.

5. Internal diameters should be in accordance with GOST 28338—89. Nominal pressure should be in accordance with GOST 26349—84. Operational pressure should be in accordance with GOST 356—80. (Revised version, Revision 5).

6. Holes for bolts and studs in the flanges of machine and instrument fittings, pipe branches of devices and reservoirs for convenience of mounting should be positioned symmetrically in relation to the main axes (but not on the main axes). (Revised version, Revision 5).

Table 13 Diameter (of the tongue

or notch), mm Tolerance band

Hole Shaft From 18 up to 30 Н12 b12 Over 30 up to 130 d11

Over 130 up to 260 Н11 Over 260 up to 500 f9 Over 500 up to 800 Н10 f9

Over 800 up to 1000 Н9

7. It is accepted for flanges of all the designs, which have 4 holes for bolts (or studs), to be manufactured in a square shape for Рnom≤4.0 MPa (40 kgf/sq.cm).

8. Tolerance of dimensions D and В: for cast-iron and cast-steel flanges should be in accordance with accuracy class 9 of GOST 26645—85; for flanges manufactured of single-precise rolled stock (В) should be in accordance with GOST 2590-88 and

GOST 2591-88; for flanges manufactured by the method of oxygen and plasma-arc cutting, should be in accordance with

accuracy class 2 of GOST 14792—80; for drop-forged flanges which are manufactured by the method of strip bar bending with subsequent joint

welding and heat alignment, should be in accordance with accuracy class Т4 of GOST 7505—89, therewith weld reinforcement is accepted, which is not taken into consideration while estimating of the extreme deviation;

if using other methods of manufacturing, should be in accordance with h16. (Revised version, Revision 5). 9. (Excluded, Revision 3). 10. Extreme deviations of the nominal dimension h: ±1 mm provided h=2 mm; ±2 mm provided h >2 mm. It is accepted to perform dimension h for cast flanges: not less than 2 mm for Dnom ≤32 mm and not less than 3 mm for Dnom >32 mm. (Revised version, Revision 3). 11. Extreme deviations of the nominal dimensions:

h1, h2 + 0.5 mm D2 ± 4.0 mm D3, D6 H12 D4, D5 h12 D7 ± 0.75 mm D8 ± 0.15 mm b2, h3 0.4 mm d H 15 D9 h14

(Revised version, Revisions 3, 4). 12. For A-type connections in accordance with GOST 14140—81 positional tolerance of axes of d holes

(maximum-material-condition tolerance) to the diameter should not be more than, mm: 1.0 — for holes with 11 mm diameter; 2.0 — for holes with 14 – 26 mm diameter; 3.0 — for holes with 30 – 45 mm diameter; 4.0 — for holes with 52 and 56 mm diameter; 6.0 — for holes with 62 – 78 mm diameter. For manufacturing flanges with threaded holes (type В in accordance with GOST 14140—81) positional

tolerance of axes of d holes (maximum-material-condition tolerance) to the diameter should not be more than, mm: 0.5 — for holes with 11 mm diameter; 1.0 — for holes with 14 – 26 mm diameter; 1.6 — for holes with 30 – 45 mm diameter; 2.0 — for holes with 52 and 56 mm diameter; 3.0 — for holes with 62 – 78 mm diameter. (Revised version, Revision 1).