Gasket - Spiral Wound, for ANSI Class 1500, B16.5 (in) | ||||
|---|---|---|---|---|
| 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 | 2.50 |
| 3/4 | 0.81 | 1.00 | 1.56 | 2.75 |
| 1 | 1.06 | 1.25 | 1.88 | 3.13 |
| 1 1/4 | 1.31 | 1.56 | 2.38 | 3.50 |
| 1 1/2 | 1.63 | 1.88 | 2.75 | 3.88 |
| 2 | 2.06 | 2.31 | 3.38 | 5.63 |
| 2 1/2 | 2.50 | 2.75 | 3.88 | 6.50 |
| 3 | 3.10 | 3.63 | 4.75 | 6.88 |
| 3 1/2 | - | 4.13 | 5.25 | 7.38 |
| 4 | 3.85 | 4.63 | 5.88 | 8.25 |
| 5 | 4.90 | 5.63 | 7.00 | 10.00 |
| 6 | 5.80 | 6.75 | 8.25 | 11.13 |
| 8 | 7.75 | 8.50 | 10.13 | 13.88 |
| 10 | 9.69 | 10.50 | 12.25 | 17.13 |
| 12 | 11.50 | 12.75 | 14.50 | 20.50 |
| 14 | 12.63 | 14.25 | 15.75 | 22.75 |
| 16 | 14.50 | 16.00 | 18.00 | 25.25 |
| 18 | 16.75 | 18.25 | 20.50 | 27.75 |
| 20 | 18.75 | 20.25 | 22.50 | 29.75 |
| 24 | 22.75 | 24.25 | 26.75 | 35.50 |
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 for NPS 24" and larger in Class 900.
- 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".
