The socket welding flange derives it name socket weld as the flange has bore and counter bore where in the matching pipe slips on. The Inside diameter of the pipe and the smaller bore of flanges matches amicably to navigate smooth flow and. While the outside diameter of pipe matches perfectly with the bigger bore of flange or the groove of flange to be welded properly to create leak free assembly both from welding inside and by welding outside.
| DIMENSIONS OF CLASS 150 FLANGES (ANSI B 16.5) (in mm) | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nominal Pipe Size |
Flange Dia 'O' |
Dia of Bolt Circle 'A' |
Dia of Bolt Holes 'D' |
No. of Holes |
Thk of Flange 'C' |
Diameter at Weld Bevel | Dia of Hub 'E' |
Length Through Hub | Bore 'B' | Dia of R/F R |
Depth of Socket F |
Length of Threading |
||||
| S/O & S/W Y |
W/N Y |
L/J Y |
S/O & S/W B |
L/J B |
||||||||||||
| 1/2'' | 15 | 88.9 | 60.3 | 15.9 | 4 | 11.1 | 21.3 | 30.2 | 15.9 | 47.6 | 15.9 | 22.3 | 22.9 | 34.9 | 9.5 | 15.9 |
| 3/4'' | 20 | 98.4 | 69.8 | 15.9 | 4 | 12.7 | 26.7 | 38.1 | 15.9 | 52.4 | 15.9 | 27.7 | 28.2 | 42.9 | 11.1 | 15.9 |
| 1'' | 25 | 107.9 | 79.4 | 15.9 | 4 | 14.3 | 33.5 | 49.2 | 17.5 | 55.6 | 17.5 | 34.5 | 35.0 | 50.8 | 12.7 | 17.5 |
| 1 ¼'' | 32 | 117.5 | 88.9 | 15.9 | 4 | 15.9 | 42.2 | 58.7 | 20.6 | 57.1 | 20.6 | 43.2 | 43.7 | 63.5 | 14.3 | 20.6 |
| 1 ½'' | 40 | 127.0 | 98.4 | 15.9 | 4 | 17.5 | 48.3 | 65.1 | 22.2 | 61.9 | 22.2 | 49.5 | 50.0 | 73.0 | 15.9 | 22.2 |
| 2'' | 50 | 152.4 | 120.6 | 19.0 | 4 | 19.0 | 60.4 | 77.8 | 25.4 | 63.5 | 25.4 | 62.0 | 62.5 | 92.1 | 17.5 | 25.4 |
| 2 ½'' | 65 | 177.8 | 139.7 | 19.0 | 4 | 22.2 | 73.1 | 90.5 | 28.6 | 69.8 | 28.6 | 74.7 | 75.4 | 104.8 | 19.0 | 28.6 |
| 3'' | 80 | 190.5 | 152.4 | 19.0 | 4 | 23.8 | 88.9 | 107.9 | 30.2 | 69.8 | 30.2 | 90.7 | 91.4 | 127.0 | 20.6 | 30.2 |
| 3 ½'' | 90 | 216.0 | 177.8 | 19.0 | 8 | 23.8 | 101.6 | 122.2 | 31.7 | 71.4 | 31.7 | 103.4 | 104.1 | 140.0 | 20.6 | 31.7 |
| 4'' | 100 | 228.6 | 190.5 | 19.0 | 8 | 23.8 | 114.3 | 134.9 | 33.3 | 76.2 | 33.3 | 116.1 | 116.8 | 157.2 | 23.8 | 33.3 |
| 5'' | 125 | 254.0 | 215.9 | 22.2 | 8 | 23.8 | 141.2 | 163.5 | 36.5 | 88.9 | 36.5 | 143.8 | 144.5 | 185.7 | 23.8 | 36.5 |
| 6'' | 150 | 279.4 | 241.3 | 22.2 | 8 | 25.4 | 168.4 | 192.1 | 39.7 | 88.9 | 39.7 | 170.7 | 171.4 | 215.9 | 27.0 | 39.7 |
| 8'' | 200 | 342.9 | 298.4 | 22.2 | 8 | 28.6 | 219.2 | 246.1 | 44.4 | 101.6 | 44.4 | 221.5 | 222.2 | 269.9 | 31.7 | 44.4 |
| 10'' | 250 | 406.4 | 361.9 | 25.4 | 12 | 30.2 | 273.0 | 304.8 | 49.2 | 101.6 | 49.2 | 276.3 | 277.4 | 323.8 | 33.3 | 49.2 |
| 12'' | 300 | 482.6 | 431.8 | 25.4 | 12 | 31.8 | 323.8 | 365.1 | 55.6 | 114.3 | 55.6 | 327.1 | 328.2 | 381.0 | 39.7 | 55.6 |
| 14'' | 350 | 533.4 | 476.2 | 28.6 | 12 | 34.9 | 355.6 | 400.0 | 57.1 | 127.0 | 79.4 | 359.1 | 360.2 | 412.7 | 41.3 | 57.1 |
| 16'' | 400 | 596.9 | 539.7 | 28.6 | 16 | 36.5 | 406.4 | 457.2 | 63.5 | 127.0 | 87.3 | 410.5 | 411.2 | 469.9 | 44.4 | 63.5 |
| 18'' | 450 | 635.0 | 577.8 | 31.7 | 16 | 39.7 | 457.2 | 504.8 | 68.3 | 139.7 | 96.8 | 461.8 | 462.3 | 533.4 | 49.2 | 68.3 |
| 20'' | 500 | 698.5 | 635.0 | 31.7 | 20 | 42.9 | 508.0 | 558.8 | 73.0 | 144.5 | 103.2 | 513.1 | 514.3 | 584.2 | 54.0 | 73.0 |
| 24'' | 600 | 812.8 | 749.3 | 34.9 | 20 | 47.6 | 609.6 | 663.6 | 82.5 | 152.4 | 111.1 | 615.9 | 615.9 | 692.1 | 63.5 | 82.5 |
Note : Thickness 'C' is inclusive of Raised Face Thickness of 1.65 MM. For Class 150
A class 150 flange can be created from various materials like stainless steel, carbon steel, ductile iron, cast iron, etc and is resistant to abrasion & corrosion with high durability. Flanges such as American standard flanges, British standard flanges and German standard flanges created using above mentioned materials have separate pressure ratings.
The pressure rating of flanges depends on various factors which we will look at in the following section.
Flanges are able to resist different pressure values at different & varied temperatures. With increase in temperature pressure rating of a flange decreases. Let us take an example to illustrate what happens; Class 150 flanges rates to about 270 PSIG (in ambient conditions), at 400 F a PSIG of 180, at 600 F a PSIG of 150 & 75 PSIG at 800 F. So it all depends on the fluid’s operating temperature.
