Gasket - Spiral Wound, for ANSI Class 2500, B16.5 (in)
- Dimensions to ASME B16.20 - Metallic Gaskets for Pipe Flanges: Ring-Joint, Spiral-Wound, and Jacketed
- Inner rings are recommended for all graphite filled gaskets, required for all PTFE filled gaskets and NPS 4" and larger in Class 2500.
- The gasket outside diameter tolerance for NPS 1/2" through NPS 8" is ±0.03"; for NPS 10" through NPS 24", +0.06", –0.03".
- The gasket inside diameter tolerance for NPS 1/2" through NPS 8" is ±0.016"; for NPS 10" through NPS 24", ±0.03".
- The centering ring outside diameter tolerance is ±0.03".
- (*) There are no Class 900 flanges in NPS 1/2" through NPS 2 1/2" (use Class 1500), or Class 2500 flanges NPS 14" and larger.
- ASME B16.20 does not include gaskets with no internal ring dimensions for NPS 1/4", 3 1/2" or 41/2".
|
|---|
| Pipe
Size
(NPS)
| Inner
Ring
Inside
Diameter
A
| Sealing
Element
Inside
Diameter
B
| Sealing
Element
Outside
Diameter
C
| Outer
Ring
Outside
Diameter
D
|
|---|
| 1/2 |
0.56 |
0.75 |
1.25 |
2.75 |
| 3/4 |
0.81 |
1.00 |
1.56 |
3.00 |
| 1 |
1.06 |
1.25 |
1.88 |
3.38 |
| 1 1/4 |
1.31 |
1.56 |
2.38 |
4.13 |
| 1 1/2 |
1.63 |
1.88 |
2.75 |
4.63 |
| 2 |
2.06 |
2.31 |
3.38 |
5.75 |
| 2 1/2 |
2.50 |
2.75 |
3.88 |
6.63 |
| 3 |
3.10 |
3.63 |
4.75 |
7.75 |
| 4 |
3.85 (*) |
4.63 |
5.88 |
9.25 |
| 5 |
4.90 (*) |
5.63 |
7.00 |
11.00 |
| 6 |
5.80 (*) |
6.75 |
8.25 |
12.50 |
| 8 |
7.75 (*) |
8.50 |
10.13 |
15.25 |
| 10 |
9.69 (*) |
10.63 |
12.25 |
18.75 |
| 12 |
11.50 (*) |
12.50 |
14.50 |
21.63 |
