
Spiral Wound Gaskets
General Description
A spiral wound gaskets is categorized as semi-metallic gasket that is typically used for high pressure applications. The sealing element is formed by winding two materials (one for sealing, one for resilience) into thin v-shaped spirals.
One material used in the sealing element is usually a metal and the other, referred to as a filler, which is a soft nonmetallic material, typically Teflon, aramid fibre or graphite. Both are chosen for compatibility with the sealing media and their ability to withstand the operating conditions. Different configurations exist to handle different flange designs and operating conditions.
These gaskets have good recovery and good tolerance for flange-surface finish irregularities. The sealing action is the result of a combination of the flow of the metal and soft filler plies when the gasket is compressed. They are particularily suited for assemblies subject to extremes in joint relaxation, temperature or pressure cycling, shock, or vibration.
Available in several standard shapes | |
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SWR | Spiral Wound Metaillic Gasket without centering ring |
SCD | Spiral Wound Metallic Gasket with centering device |
SOR | Spiral Wound Metallic Gasket with centering ring. (Centering ring made of carbon steel stainless steel and other metals) |
SIO | Spiral Wound Metallic Gasket with inner & outer rings. (Rings are made of carbon steel stainless steel and other metals) |
SIOH | Spiral Wound Metallic Gasket with outer ring supplied with bolt holes and inner rings |
SIR | Spiral Wound Metallic Gasket with inner rings. (Rings generally of stainless steel) |
Material Selection Table
Metal winding strip | Filler materials | Guide ring materials inner & outer |
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Stainless Steel 304 / 304L | Asbestos Fiber | Carbon Steel |
Stainless Steel 316 / 316l | Non Asbestos Fiber | Stainless Steel 304 / 304L |
Stainless Steel 316Ti | Graphite | Stainless Steel 316 / 316l |
Stainless Steel 321 | P.T.F.E | Stainless Steel 316Ti |
Stainless Steel 317 / 317L | Ceramic | Stainless Steel 321 |
Monel 400 | Stainless Steel 317 / 317L | |
Inconel 600 | Monel 400 | |
Incoloy 800 / 825 | Inconel 600 | |
Titanium | Incoloy 800 / 825 | |
Nickel 200 | Titanium | |
Nickel 200 |
Flange Standards | |
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ASME/ANSIB16.5 | MSS SP44 (ASME B16.47 SERIES A) (AWWA) |
BS 1560, BS10, BS4504 | DIN FLANGES, JIS FLANGES |
API 605 (ASME B16.47 SERIES B) | FRENCH NF STANDARD |