Dimensions of Large Size Spiral Wound Gaskets of Rating 300# used with Large Size Raised Face flanges ASME B16.47 Series A
| Class 300 NPS 26″ – 60″ | ||||
| NPS | Inner Ring | Sealing Element | Outer Ring | |
| Inside (d1) | Inside (d2) | Outside (d3) | Outside (d4) | |
| Dia. | Dia.mm | Dia.mm | Dia.mm | |
| 26 | 654.1 | 685.8 | 736.6 | 835.2 |
| 28 | 704.9 | 736.6 | 787.4 | 898.7 |
| 30 | 755.7 | 793.8 | 844.6 | 952.5 |
| 32 | 806.5 | 850.9 | 901.7 | 1006.6 |
| 34 | 857.3 | 901.7 | 952.5 | 1057.4 |
| 36 | 908.1 | 955.8 | 1006.6 | 1117.6 |
| 38 | 952.5 | 977.9 | 1016.0 | 1054.1 |
| 40 | 1003.3 | 1022.4 | 1070.1 | 1114.6 |
| 42 | 1054.1 | 1073.2 | 1120.9 | 1165.4 |
| 44 | 1104.9 | 1130.3 | 1181.1 | 1219.2 |
| 46 | 1152.7 | 1178.1 | 1228.9 | 1273.3 |
| 48 | 1209.8 | 1235.2 | 1286.0 | 1324.1 |
| 50 | 1244.6 | 1295.4 | 1346.2 | 1378.0 |
| 52 | 1320.8 | 1346.2 | 1397.0 | 1428.8 |
| 54 | 1352.6 | 1403.4 | 1454.2 | 1492.3 |
| 56 | 1403.4 | 1454.2 | 1505.0 | 1543.1 |
| 58 | 1447.8 | 1511.3 | 1562.1 | 1593.9 |
| 60 | 1524.0 | 1562.1 | 1612.9 | 1644.7 |
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General notes:
- Dimensions are in millimeters unless otherwise indicated.
- Image shows a Spiral Wound gasket with Inner – and Outer ring.
- d1 = Inside diameter when Inner ring is used.
- d2 = Inside diameter sealing element when no Inner ring is used.
- d3 = Outside diameter of sealing element.
- d4 = Outside diameter of Outer ring.
- Thickness of inner and outer ring: 2.97 mm – 3.33 mm.
- Thickness sealing element: 4.45 mm.
- Tolerance Outside diameter for NPS 1/2 through NPS 8 is ± 0.8 mm; for NPS 10 trough NPS 24 tolerance is + 1.5 mm – 0.8 mm.
- ASME B16.20 does not covers class 400 flanges up to NPS 3 and class 900 flanges up to NPS 2½.
- There are no class 400 flanges NPS 1/2 thru NPS 3 (use Class 600), class 900 flanges NPS 1/2 thru NPS 2½ (use Class 1500), or class 2500 flanges NPS 14 or larger.
- The inner ring inside diameters shown for NPS 1¼ thru 2½ in class 1500 and 2500 will produce inner ring widths of 0.12 inches, a practical minimum for production purposes.
- ASME B16.20 which covers spiral wound gaskets requires the use of solid metal inner rings in: Pressure Class 900, nominal pipe sizes 24 and larger, Pressure Class 1500 from nominal pipe sizes 12 and larger, Pressure Class 2500 from nominal pipe sizes 4 and larger and all PTFE filled gaskets.
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