Spiral wound gaskets consist of a V-shaped metal strip spirally wound in combination with a soft, filler material. The metal strip provides outstanding recovery, while the flexible filler guarantees excellent sealing.
Due to this combination of materials the spiral wound gasket is suitable for sealing under severely fluctuating temperature and pressure conditions. Depending on the application, the spiral wound gasket can be specified with outer and/or inner rings.
Spiral gasket only
Gasket with guide ring to act as a compression stop
Gasket with inner ring
Standard gasket with inner ring and outer rings
Special gasket for RTJ flanges
For large diameter heat exchangers
As HX-R but with inner ring
Where an undesirable reaction between graphite and the medium to be sealed occurs, a spiral wound gasket with a GT-Zone can be effective in producing a seal that will not pollute medium and gives excellent gas tightness.
We precision manufacture a comprehensive range of spiral wound gaskets by winding alternating strips of metal and filler material. By combining different winding materials and metals, gaskets can be tailored to suit a wide variety of operating conditions, but are most typically used for processes involving steam, chemicals, oils and hydrocarbons.
The outer rings rest on the flange bolts, thus locating the gasket centrally on the raised face of the flange. It also supports the sealing element and resists 'blow out'. The ring provides a 'stop' preventing over-compression of the sealing element.
The material construction of a spiral wound gasket is based upon the required operating conditions, typically temperature, pressure and substance. For example, a typical standard spiral wound gasket could be made up of a 316 Stainless Steel inner ring and winding with a graphite filler, and a carbon steel outer ring.
To allow for various chemical compatibilities and pressure/temperature requirements, a selection of filler materials are available, including graphite, PTFE, Non-asbestos and Mica.
|Filler Materials||Temperature Range||Max PSI/BAR||PN Range||Colour Coding|
|Graphite||min -200 max 550 °C||250 bar||10- 320||Grey Stripe|
|PTFE||min - 200 max 250 °C||100 bar||10- 320||White Stripe|
|Nonas||min - 100 max 250 °C||100 bar||10-320||Pink Stripe|
|Mica||min -200 max 1000 °C||100 bar||10-320||Light Green Stripe|
|Winding Materials||Temperature Range||Max PSI/BAR||PN Range||Colour Coding|
|304 Stainless Steel||min-250 max 550 °C||650°C||10-320||Yellow|
|316L Stainless Steel||min - 100 max 550 °C||800°C||10-320||Green|
|347 Stainless Steel||min -250 max 550 °C||870°C||10-320||N/A|
|321 Stainless Steel||min-250 max 550 °C||870°C||10-320||N/A|
|Monel 400||min -125 max 600 °C||800°C||10-320||Orange|
|Nickel 200||min - 250 max 600 °C||600°C||10-320||Red|
|Titanium||min - 250 max 350 °C||450°C||10-320||Purple|
|Hastelloy B-2||min - 200 max 450 °C||500°C||10-320||Brown|
|Hastelloy C-276||min -200 max 450 °C||450°C||10-320||Beige|
|Inconel 600||min - 100 max 950 °C||1000°C||10-320||Gold|
|Incoloy 825||min -100 max 450 °C||450°C||10-320||Gold|
Our highly experienced technicians can advise you on the best sheet materials and manufacturing processes for a wide range of gasket applications.
Spiral wound gaskets are typically used in applications subjected to high temperature, high pressure and toxic chemicals in areas such as petrochemical refineries and chemical processing plants. They can also be used in low temperature applications such as chemical plants, research laboratories and cryogenic facilities.
Spiral wound gaskets are most often used in pumps, pipes, valves, heat exchangers, and systems that encounter high pressures, extreme temperatures and chemical attack. Flexibility is key to the design and manufacture of spiral wound gaskets, enabling the seal to recover under extreme temperature and pressure fluctuations.