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 |