Spiral Wound Gasket

Spiral Wound GasketSpiral Wound Gasket is the ideal gasket in the semi-metallic category. A narrow strip of V-shap metal hoop is spirally wound under tension with a filler cushion between the lamination of the metal and is spot-welded at both ends.

This unique construction of a spring-like metal and soft filler provides gasket excellent characteristics:

  • Resistance to high temperature and high pressures.
  • Great resilience which allows the gasket to adjust automatically to change in operating conditions, such as pressure and thermal shocks, vibrations etc.
  • Excellent sealability is maintained with comparatively small gasket area.
  • Good tolerance for flange surface finish irregularities.
  • Can be designed to any dimensions economically in circular or moderately noncircular shape. Available in a variety of hoop metals and filler materials to satisfy specific operating conditions.

Structure:

Type Cross section Hoop material Filler material Inner, Outer ring material Normal TDickness
Gaskets Rings
Basic type sic type CS,304(L)SS, 31 (L)SS, 321SS, 347LSS, Monel, Titanium,
Inconel, Hastelloy B/C, Incoloy, etc.
Asbestos CS, 304(L)SS, 316(L)SS, 321SS, 347LSS, Monel, Titanium, Inconel, Hastelloy B/CIncoloy,etc. 2.5(.0624”)
3.2(.125”)
4.5(.175”)
6.4(.250”
7.25(.285”)
2
3
4
WiTD inner ring WiTD inner ring Non-asbestos
WiTD outer ring WiTD outer ring Flexible graphite
WiTD inner &out ring WiTD inner &out ring PTFE
Ceramic

Available Sizes:

Item DIN (mm) ANSI B16.5 BS1560 (mm)Mss sp-44 API 605 Tolerances
Inner ring I.D.Gasket I.D. ≤ 600 ≤ 24" ≥ 26" & ≤34" ±0.5
>600 & ≤800 >24" & ≤ 34" ≥ 36" & ≤60" ±0.9
>800 & ≤1600 >34" & ≤60" - ±1.3
>1600 >60" - ±1.6
Gasket O.D. ≤ 600 ≤ 24" ≥ 24" ±0.9
>600 & ≤1600 >24" & ≤60" >24" & ≤60" ±1.8
>1600 >60" - ±2.2
Outer ring O.D - - ≥ 1/2" &≤ 60" ±0.9
≤ 600 ≤ 24" - 0-1.0
>600 & ≤1000 >24" & ≤34" - 0-1.8
>1000 & ≤1600 >34" & ≤60" - 0-2.2