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Class 900 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 |
5.88 |
1.50 |
3.25 |
R16 |
2.000 |
0.250 |
0.344 |
0.03 |
1.00 |
2.06 |
1.32 |
See Note (5). |
1/4 |
4.00 |
4 |
1.00 |
7/8 |
6.00 |
6.25 |
| 1-1/2" |
2.88 |
7.00 |
1.50 |
3.50 |
R20 |
2.688 |
0.250 |
0.344 |
0.03 |
1.00 |
2.75 |
1.90 |
1/4 |
4.88 |
4 |
1.12 |
1 |
6.25 |
6.50 |
| 2" |
3.62 |
8.50 |
1.50 |
4.00 |
R24 |
3.750 |
0.312 |
0.469 |
0.03 |
1.06 |
4.12 |
2.38 |
1/4 |
6.50 |
8 |
1.00 |
7/8 |
6.00 |
6.50 |
| 2-1/2" |
4.12 |
9.62 |
1.62 |
4.12 |
R27 |
4.250 |
0.312 |
0.469 |
0.03 |
1.06 |
4.88 |
2.88 |
1/4 |
7.50 |
8 |
1.12 |
1 |
6.50 |
7.00 |
| 3" |
5.00 |
9.50 |
1.50 |
4.00 |
R31 |
4.875 |
0.312 |
0.469 |
0.03 |
1.06 |
5.00 |
3.50 |
3/8 |
7.50 |
8 |
1.00 |
7/8 |
6.00 |
6.50 |
| 4" |
6.19 |
11.50 |
1.75 |
4.50 |
R37 |
5.875 |
0.312 |
0.469 |
0.03 |
1.06 |
6.25 |
4.50 |
1/2 |
9.25 |
8 |
1.25 |
1-1/8 |
7.00 |
7.50 |
| 6" |
8.50 |
15.00 |
2.19 |
5.50 |
R45 |
8.312 |
0.312 |
0.469 |
0.03 |
1.06 |
9.25 |
6.63 |
1/2 |
12.50 |
12 |
1.25 |
1-1/8 |
7.75 |
8.25 |
| 8" |
10.62 |
18.50 |
2.50 |
6.38 |
R49 |
10.625 |
0.312 |
0.469 |
0.03 |
1.06 |
11.75 |
8.63 |
1/2 |
15.50 |
12 |
1.50 |
1-3/8 |
9.00 |
9.50 |
| 10" |
12.75 |
21.50 |
2.75 |
7.25 |
R53 |
12.750 |
0.312 |
0.469 |
0.03 |
1.06 |
14.50 |
10.75 |
1/2 |
18.50 |
16 |
1.50 |
1-3/8 |
9.50 |
10.00 |
| 12" |
15.00 |
24.00 |
3.12 |
7.88 |
R57 |
15.00 |
0.312 |
0.469 |
0.03 |
1.06 |
16.50 |
12.75 |
1/2 |
21.00 |
20 |
1.50 |
1-3/8 |
10.25 |
10.75 |
| 14" |
16.25 |
25.25 |
3.38 |
8.38 |
R62 |
16.50 |
0.438 |
0.656 |
0.06 |
1.31 |
17.75 |
14 |
1/2 |
22.00 |
20 |
1.62 |
1-1/2 |
11.00 |
11.50 |
| 16" |
18.50 |
27.75 |
3.50 |
8.50 |
R66 |
18.500 |
0.438 |
0.656 |
0.06 |
1.44 |
20.00 |
16.00 |
1/2 |
24.25 |
20 |
1.75 |
1-5/8 |
11.50 |
12.00 |
| 18" |
21.00 |
31.00 |
4.00 |
9.00 |
R70 |
21.000 |
0.500 |
0.781 |
0.06 |
1.56 |
22.25 |
18.00 |
1/2 |
27.00 |
20 |
2.00 |
1-7/8 |
13.00 |
13.75 |
| 20" |
23.00 |
33.75 |
4.25 |
9.75 |
R74 |
23.000 |
0.500 |
0.781 |
0.06 |
1.56 |
24.50 |
20.00 |
1/2 |
29.50 |
20 |
2.12 |
2 |
14.00 |
14.75 |
| 24" |
27.25 |
41.00 |
5.50 |
11.50 |
R78 |
27.25 |
0.625 |
1.062 |
0.09 |
1.88 |
29.50 |
24.00 |
1/2 |
35.50 |
20 |
2.62 |
2-1/2 |
17.50 |
18.50 |
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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
3 - 12 and 0.38 in. for NPS 14 - 24. Bolt lengths for
ring type joint flanges include allowance of 0.62 in. for NPS 3 - 10, 0.75 in. for NPS 12.
- Bore is to be specified by the purchaser.
- Ring joint flanges larger than NPS 12 will require angular meter taps as shown in Fig 3.
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