Gasket - Spiral Wound, for ANSI Class 900, 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.
- 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" or 3 1/2" and Class 900 flanges up to NPS 2 1/2".
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 (*) | — | 0.75 | 1.25 | 2.50 |
3/4 (*) | — | 1.00 | 1.56 | 2.75 |
1 (*) | — | 1.25 | 1.88 | 3.13 |
1 1/4 (*) | — | 1.56 | 2.38 | 3.50 |
1 1/2 (*) | — | 1.88 | 2.75 | 3.88 |
2 (*) | — | 2.31 | 3.38 | 5.63 |
2 1/2 (*) | — | 2.75 | 3.88 | 6.50 |
3 | 3.10 | 3.75 | 4.75 | 6.63 |
3 1/2 | — | 4.13 | 5.25 | 7.50 |
4 | 4.04 | 4.75 | 5.88 | 8.13 |
5 | 5.05 | 5.81 | 7.00 | 9.75 |
6 | 6.10 | 6.88 | 8.25 | 11.38 |
8 | 7.75 | 8.75 | 10.13 | 14.13 |
10 | 9.69 | 10.88 | 12.25 | 17.13 |
12 | 11.50 | 12.75 | 14.50 | 19.63 |
14 | 12.63 | 14.00 | 15.75 | 20.50 |
16 | 14.75 | 16.25 | 18.00 | 22.63 |
18 | 16.75 | 18.25 | 20.50 | 25.13 |
20 | 19.00 | 20.50 | 22.50 | 27.50 |
24 | 23.25 | 24.75 | 26.75 | 33.00 |