Industries & Applications

Dims of Spiral Wound Gaskets ASME B16.20 used with Raised Face flanges ASME B16.5

2020-04-15

Other Pressure Classes

150
 
300
 
400
 
600
 
900
   
NPS Inner Ring Sealing Element Outer Ring
d1 d2 d3 d4
1/2 14.2 19.1 31.8 47.8
3/4 20.6 25.4 39.6 57.2
1 26.9 31.8 47.8 66.8
38.1 47.8 60.5 76.2
44.5 54.1 69.9 85.9
2 55.6 69.9 85.9 104.9
66.5 82.6 98.6 124
3 81 101.6 120.7 136.7
4 106.4 127 149.4 174.8
5 131.8 155.7 177.8 196.9
6 157.2 182.6 209.6 222.3
8 215.9 233.4 263.7 279.4
10 268.2 287.3 317.5 339.9
12 317.5 339.9 374.7 409.7
14 349.3 371.6 406.4 450.9
16 400.1 422.4 463.6 514.4
18 449.3 474.7 527.1 549.4
20 500.1 525.5 577.9 606.6
24 603.3 628.7 685.8 717.6

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.

Marking of Spiral Wound Gaskets

Marking of Spiral Wound Gaskets

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