Large Size Spiral Wound Gasket Dimensions Rating 300# Series B

Dimensions of Large Size Spiral Wound Gaskets of Rating 300# used with Large Size Raised Face flanges ASME B16.47 Series B


150# | 300# | 400# | 600# | 900#

Class 300 NPS 26″ – 60″
NPSInner Ring Sealing ElementOuter Ring
Inside (d1) Inside (d2)Outside (d3)Outside (d4)
Dia.Dia.mmDia.mmDia.mm
26654.1673.1711.2771.7
28704.9723.9762.0825.5
30755.7774.7812.8886.0
32806.5825.5863.6939.8
34857.3876.3914.4993.9
36908.1927.1965.21047.8
38971.61009.71047.81098.6
401022.41060.51098.61149.4
421085.91111.31149.41200.2
441124.01162.11200.21251.0
461178.11216.21254.31317.8
481231.91263.71311.41368.6
501267.01317.81355.91419.4
521317.81368.61406.91470.2
541365.31403.41454.21530.4
561428.81479.61524.01593.9
581484.41535.21573.31655.8
601557.31589.01630.41706.6

[google-square-ad]

General notes:

  1. Dimensions are in millimeters unless otherwise indicated.
  2. Image shows a Spiral Wound gasket with Inner – and Outer ring.
  3. d1 = Inside diameter when Inner ring is used.
  4. d2 = Inside diameter sealing element when no Inner ring is used.
  5. d3 = Outside diameter of sealing element.
  6. d4 = Outside diameter of Outer ring.
  7. Thickness of inner and outer ring: 2.97 mm – 3.33 mm.
  8. Thickness sealing element: 4.45 mm.
  9. 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.
  10. ASME B16.20 does not covers class 400 flanges up to NPS 3 and class 900 flanges up to NPS 2½.
  11. 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.
  12. 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.
  13. 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.

[google-square-ad]