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Class 2500 Orifice Flanges, Welding Neck
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| Nominal Pipe Size |
Outside Diameter of Raised Face - R |
Outside Diameter of Flange - O |
Thickness of Flange, Min. - C |
Length Through Hub |
Ring Type Joint |
Diamter of Hub - X |
Hub Diameter at Beginning of Chamfer - A |
Bore - B |
Diameter of Pressure Connection - TT |
Drilling Template |
Length of Stud Bolts [(4)(5)] |
| Groove number |
Pitch Diameter - P |
Groove Depth - E |
Groove Width - F |
Radius at Bottom - rmax |
Special Oval Ring Height - W |
Bolt Circle |
Number of Holes |
Diameter of Holes |
Diameter of Bolts |
Raised Face |
Ring Joint |
| 1" |
2.00 |
6.25 |
1.50 |
3.62 |
R18 |
2.375 |
0.250 |
0.344 |
0.03 |
1.00 |
2.25 |
1.32 |
See Note (5). |
1/4 |
4.25 |
4 |
1.00 |
7/8 |
6.00 |
6.25 |
| 1-1/2" |
2.88 |
8.00 |
1.75 |
4.38 |
R23 |
3.250 |
0.312 |
0.469 |
0.03 |
1.06 |
3.12 |
1.90 |
1/4 |
5.75 |
4 |
1.25 |
1-1/8 |
7.00 |
6.25 |
| 2" |
3.62 |
9.25 |
2.00 |
5.00 |
R26 |
4.000 |
0.312 |
0.469 |
0.03 |
1.06 |
3.75 |
2.38 |
1/4 |
6.75 |
8 |
1.12 |
1 |
7.25 |
7.75 |
| 2-1/2" |
4.12 |
10.50 |
2.25 |
5.62 |
R28 |
4.375 |
0.375 |
0.531 |
0.06 |
1.19 |
4.50 |
2.88 |
1/4 |
7.75 |
8 |
1.25 |
1-1/8 |
8.00 |
8.50 |
| 3" |
5.00 |
12.00 |
2.62 |
6.62 |
R32 |
5.000 |
0.375 |
0.531 |
0.06 |
1.19 |
5.25 |
3.50 |
3/8 |
9.00 |
8 |
1.38 |
1-1/4 |
9.00 |
9.50 |
| 4" |
6.19 |
14.00 |
3.00 |
7.50 |
R38 |
6.188 |
0.438 |
0.656 |
0.06 |
1.31 |
6.50 |
4.50 |
1/2 |
10.75 |
8 |
1.62 |
1-1/2 |
10.25 |
10.75 |
| 6" |
8.50 |
19.00 |
4.25 |
10.75 |
R47 |
9.000 |
0.500 |
0.781 |
0.06 |
1.44 |
9.25 |
6.63 |
1/2 |
14.50 |
8 |
2.12 |
2 |
13.75 |
14.50 |
| 8" |
10.62 |
21.75 |
5.00 |
12.50 |
R51 |
11.000 |
0.562 |
0.906 |
0.06 |
1.56 |
12.00 |
8.63 |
1/2 |
17.25 |
12 |
2.12 |
2 |
15.25 |
16.00 |
| 10" |
12.75 |
26.50 |
6.50 |
16.50 |
R55 |
13.500 |
0.688 |
1.188 |
0.09 |
1.88 |
14.75 |
10.75 |
1/2 |
21.25 |
12 |
2.62 |
2-1/2 |
19.25 |
20.25 |
| 12" |
15.00 |
30.00 |
7.25 |
18.25 |
R60 |
16.000 |
0.688 |
1.312 |
0.09 |
2.00 |
17.38 |
12.75 |
1/2 |
24.38 |
12 |
2.88 |
2-3/4 |
21.25 |
22.50 |
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General Note: Dimensions are in inches.
Notes:
- Other NPT sizes may be furnished if required.
- All other dimensions are in accordance with ASME B16.5.
- In conformance with ASME B16.5, stud bolt lengths do not include point heights.
- Bolt lengths for raised face flanges include allowance for orifice and gasket thickness of 0.25 in. for NPS
1 - 12. Bolt lengths for
ring type joint flanges include allowance of 0.62 in. for NPS 1 - 3.
- Bore is to be specified by the purchaser.
- Ring joint flanges larger than NPS 3 will require angular meter taps as shown in Fig 3.
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