Spiral Wound Gaskets

Spiral Wound Gaskets are a robust sealing product widely used across many industrial applications.

Spiral Wound Gaskets consist of a ‘V’ shaped metal strip spirally wound in combination with a soft filler material - normally Graphite, PTFE or Mica depending on the application and customer specification.

Technical details:

  • Spiral Wound Gaskets are suitable for use across a wide gasket stress range and are able to seal fluid pressures up to 400 bar and from cryogenic temperatures up to 1000oC.
  • Available to suit ASME, DIN or JIS standard flanges or to special dimensions in materials to suit mating flange.
  • Available in bespoke sizes to suit vessel or exchanger applications.
  • By combining different winding materials and metals, Spiral Wound Gaskets can be tailored to suit a wide variety of operating conditions.
  • The outer guide ring simplifies assembly and prevents blowout of the gasket.

The gasket is easy to remove after service and does not cause any damage to the flange faces.

Spiral Wound Gasket Profiles

SGIR

The preferred, most common type which offers the best performance. Gaskets supplied with outer guide ring to centralize the gasket and inner ring which acts as a compression stop and prevents inward buckling – used for RF flanges.

SWG-SGIR-Gasket-Diagram.png
SG (No Inner Ring)

Supplied with outer guide ring only – no inner ring.  Used on RF flanges but not recommended over SGIR type.

SWG-SG-Gasket-Diagram.png
RIR

Mainly used for male and female flanges and recess flanges. The inner ring is necessary as a compression stop.

SWG-Type-RIR-Gasket-Diagram.png
R

Mainly used for valve bonnets, male and female flanges, recess flanges, and load bearing flange configurations such as tongue and groove flanges. 

SWG-Type-R-Gasket-Diagram.png

Spiral Wound Gasket Materials

Filler MaterialMax TemperatureASME B16.20 Colour Coding
Graphite 550 ºC Grey Stripe
PTFE 250 ºC White Stripe
Mica 1000 ºC Light Green
Winding MaterialMax TemperatureASME B16.20 Colour Coding
Carbon Steel 500 ºC Silver
316L Stainless 800 ºC Green
304 Stainless 650 ºC Yellow
Duplex 800 ºC N/A
347 Stainless 870 ºC Blue
321 Stainless 870 ºC Turquoise
Monel 400 800 ºC Orange
Nickel 200 600 ºC Red
Titanium 540 ºC Purple
Hastelloy B-2 1000 ºC Brown
Hastelloy C-276 1000 ºC Beige
Inconel 600 1000 ºC Gold
Inconel 625 1000 ºC Gold
Inconel X-750 1000 ºC Light Grey
Incoloy 825 1000 ºC White
Zirconium 702 500 ºC N/A

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