Dimensions of Large Size Spiral Wound Gaskets of Rating 300# used with Large Size Raised Face flanges ASME B16.47 Series B
| 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 | 673.1 | 711.2 | 771.7 |
| 28 | 704.9 | 723.9 | 762.0 | 825.5 |
| 30 | 755.7 | 774.7 | 812.8 | 886.0 |
| 32 | 806.5 | 825.5 | 863.6 | 939.8 |
| 34 | 857.3 | 876.3 | 914.4 | 993.9 |
| 36 | 908.1 | 927.1 | 965.2 | 1047.8 |
| 38 | 971.6 | 1009.7 | 1047.8 | 1098.6 |
| 40 | 1022.4 | 1060.5 | 1098.6 | 1149.4 |
| 42 | 1085.9 | 1111.3 | 1149.4 | 1200.2 |
| 44 | 1124.0 | 1162.1 | 1200.2 | 1251.0 |
| 46 | 1178.1 | 1216.2 | 1254.3 | 1317.8 |
| 48 | 1231.9 | 1263.7 | 1311.4 | 1368.6 |
| 50 | 1267.0 | 1317.8 | 1355.9 | 1419.4 |
| 52 | 1317.8 | 1368.6 | 1406.9 | 1470.2 |
| 54 | 1365.3 | 1403.4 | 1454.2 | 1530.4 |
| 56 | 1428.8 | 1479.6 | 1524.0 | 1593.9 |
| 58 | 1484.4 | 1535.2 | 1573.3 | 1655.8 |
| 60 | 1557.3 | 1589.0 | 1630.4 | 1706.6 |
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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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