Type and Construction
The solid weld neck flanges are in accordance with EEMUA 234, Section 3 for 16 and 20 bar systems. The range of sizes covered is ½ in./ 16 mm to 36 in./914 mm Class 150. Other sizes are available on request. Drilling and outside diameter dimensions of flange sizes ½ in./16 mm-24 in./610 mm are in accordance with ANSI B16.5 and BS 1560, whereas the larger sizes, 28 in./711 mm -36 in./914 mm are in accordance with MSS SP-44. The recommended bolting is in accordance with ASTM B150 alloy UNS C63000.
Dimensions
Dimensions are based on EEMUA -234, Section 3, Table 3.2-3.3.
Tolerances
The tolerances are based on EEMUA – 234, Section 3, Table 3.4.
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| 16 bar | 20 bar | 16 bar | 20 bar | 16 bar | 20 bar |
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Nominal Size | O.D. of Flange | Thickn. of Flange | Dia of Hub | Hub dia at weld Chamfer | Length Through Hub | Bore of Flange | Thickn. of Hub at Welding End | Approx. Weight | Parallel Length of Hub | Dia of Bolt Circle | Drilling | Dia of Bolt Holes | ||||
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| D | b | d6 | d3 | H | d7 | d7 | S1 min | S1 min |
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| h | K | No. Of Bolts | d2 |
in | mm | mm | mm | mm | mm | mm | mm | mm | mm | mm | kg | kg | mm | mm |
| mm |
½ | 16 | 89 | 14 | 23 | 16 | 48 | u | 12.00 | u | 2.0 | u | 0.7 | 8 | 60.3 | 4 | 15.9 |
¾ | 25 | 98 | 16 | 32 | 25 | 52 | 21.00 | 2.0 | 1.0 | 7 | 69.8 | 4 | 15.9 | |||
1 | 30 | 108 | 16 | 42 | 30 | 56 | 25.00 | 2.5 | 1.3 | 8 | 79.4 | 4 | 15.9 | |||
1¼ | 38 | 117 | 17 | 51 | 38 | 57 | 33.03 | 2.5 | 1.7 | 8 | 88.9 | 4 | 15.9 | |||
1½ | 44.5 | 127 | 20 | 61 | 44.5 | 62 | 39.53 | 2.5 | 2.3 | 7 | 98.4 | 4 | 15.9 | |||
2 | 57 | 152 | 25 | 73 | 57 | 64 | 52.16 | 2.5 | 4.1 | 9 | 120.6 | 4 | 19.0 | |||
2½ | 76.1 | 178 | 27 | 91 | 76.1 | 70 | 71.23 | 2.5 | 6.1 | 8 | 139.7 | 4 | 19.0 | |||
3 | 88.9 | 190 | 27 | 105 | 88.9 | 70 | 84.08 | 2.5 | 7.1 | 8 | 152.4 | 4 | 19.0 | |||
4 | 108 | 229 | 27 | 135 | 108 | 76 | 102.13 | 3.0 | 10.2 | 8 | 190.5 | 8 | 19.0 | |||
6 | 159 | 279 | 27 | 192 | 159 | 89 | 153.75 | 152.38 | 3.0 | 3.5 | 15.5 | 15.8 | 8 | 241.3 | 8 | 22.2 |
8 | 219.1 | 343 | 31 | 246 | 219.1 | 98 | 211.10 | 210.10 | 4.0 | 4.5 | 27.7 | 28.0 | 8 | 298.4 | 8 | 22.2 |
10 | 267 | 406 | 31 | 305 | 267 | 98 | 257.97 | 255.93 | 4.5 | 5.5 | 38.5 | 39.3 | 8 | 362.0 | 12 | 25.4 |
12 | 323.9 | 483 | 35 | 365 | 323.9 | 98 | 312.83 | 309.74 | 5.5 | 7.0 | 61.6 | 62.9 | 8 | 431.8 | 12 | 25.4 |
14 | 368 | 533 | 41 | 400 | 368 | 99 | 354.22 | 351.00 | 6.5 | 8.0 | 86.8 | 88.4 | 8 | 476.2 | 12 | 28.6 |
16 | 419 | 597 | 43 | 457 | 419 | 106 | 404.17 | 399.84 | 7.0 | 9.0 | 114.2 | 115.6 | 8 | 539.8 | 16 | 28.6 |
18 | 457.2 | 635 | 45 | 505 | 457.2 | 113 | 441.50 | 438.50 | 8.0 | 9.5 | 136.0 | 140.7 | 8 | 577.8 | 16 | 31.8 |
20 | 508 | 698 | 45 | 559 | 508 | 118 | 490.50 | 486.50 | 8.5 | 11.0 | 164.6 | 168.4 | 8 | 635.0 | 20 | 31.8 |
24 | 610 | 813 | 49 | 664 | 610 | 137 | 589.50 | 584.50 | 10.5 | 13.0 | 247.7 | 253.7 | 8 | 749.3 | 20 | 34.9 |
28 | 711 | 927 | 72 | 748 | 711 | 145 | 687.50 | 681.40 | 12.0 | 15.0 | 453.0 | 461.1 | 8 | 864.0 | 28 | 34.9 |
32 | 813 | 1060 | 72 | 876 | 813 | 160 | 786.50 | 779.50 | 13.5 | 17.0 | 599.0 | 611.1 | 8 | 978.0 | 28 | 41.1 |
36 | 914 | 1168 | 72 | 984 | 914 | 175 | 883.50 | 876.50 | 15.5 | 19.0 | 741.0 | 755.7 | 8 | 1086.0 | 32 | 41.1 |
It should be noted that although these flanges are flat faced, inside bolt circle gaskets shall be used and special care should be taken to avoid overtightening the bolting.