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Dobson Gaskets is a leading UK manufacturer of gaskets and sealing products

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+44 (0) 1535 607257
 

Address

E Dobson and Co [Gaskets] Ltd
Unit 1
Holme Mill Ind Estate
Fell Lane
Keighley
West Yorkshire
BD22 6BN

Call Us Now

+44 (0) 1535 607257

Call Us Now

+44 (0) 1535 607257
 

Opening times

Mon - Thur 8.00 - 17.00
Fri 8.00 - 16.00

spiral gaskets

Spiral Wound Gaskets

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.

Type RF1

Type RF1

Spiral gasket only

Type SG

Type SG

Gasket with guide ring to act as a compression stop

Type RF IR

Type RF IR

Gasket with inner ring

Type SG IR

Type SG IR

Standard gasket with inner ring and outer rings

Type SG-RTJ

Type SG-RTJ

Special gasket for RTJ flanges

Type HX-R

Type HX-R

For large diameter heat exchangers

Type HX-RIR

Type HX-RIR

As HX-R but with inner ring

Special Profiles

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.

The Manufacture of Spiral Wound Gaskets

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.

Key Features

  • Temperature: Up to +1000°C.
  • Fluid Pressures: Up to 250 bar
  • Provides outstanding performance over a wide range of media and temperatures including steam, chemicals, oils and hydrocarbons.
  • Because of the robust design of the spiral wound gasket, it is simple to install without damage, although care should be taken in transporting and installing large diameter gaskets without inner or outer guide rings.
  • The gasket is non-adhesive and is easily removed.
  • All graphite gaskets produced undergo rigorous testing and are supplied to recognised national and international standards.

The Manufacturing Proccess Of A Spiral Wound Gasket

Spiral Gasket Materials

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

Filler Materials Temperature Range Max PSI/BAR PN Range
Graphite min -200 max 550 °C  250 bar  10- 320
PTFE min - 200 max 250 °C  100 bar  10- 320
Nonas min - 100 max 250 °C  100 bar  10-320
Mica min -200 max 1000 °C  100 bar  10-320

Spiral Winding Materials

Winding Materials Temperature Range Max PSI/BAR PN Range
304 Stainless Steel min-250 max 550 °C  650°C  10-320
316L Stainless Steel min - 100 max 550 °C  800°C  10-320
347 Stainless Steel min -250 max 550 °C  870°C  10-320
321 Stainless Steel min-250 max 550 °C  870°C  10-320
Monel 400 min -125 max 600 °C  800°C  10-320
Nickel 200 min - 250 max 600 °C  600°C  10-320
Titanium min - 250 max 350 °C  450°C  10-320
Hastelloy B-2 min - 200 max 450 °C  500°C  10-320
Hastelloy C-276 min -200 max 450 °C  450°C  10-320
Inconel 600 min - 100 max 950 °C  1000°C  10-320
Incoloy 825 min -100 max 450 °C  450°C  10-320

 

NEED ADVICE?
Talk to a Technician

Our highly experienced technicians can advise you on the best sheet materials and manufacturing processes for a wide range of gasket applications.

CALL: +44 (0) 1535 607257

SPIRAL WOUND GASKET APPLICATIONS
Essential for Critical 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.

  • Petrochemical
  • Pharmaceutical
  • Nuclear Energy
  • Oil and Gas
  • Offshore
  • Marine
  • Pump and Valve

Gasket Sheet Materials

We supply a vast range of gasket materials, available to buy directly or order from us. For more information visit the Gasket Sheet Materials page

  • PTFE Gasket Sheet
  • Rubber Gasket Sheet
  • Spiral Wound Gasket Sheet
  • Teflon Gasket Sheet
  • Viton Gasket Sheet
  • Graphite Gasket Sheet
  • Novus Gasket Sheet
  • Flexitallic Gasket Sheet
  • Closed Cell Foam Gasket Sheet
  • Neoprene Foam Gasket Sheet
  • Sponge Gasket Sheet
  • Durlon Gasket Sheet
  • Grafoil Gasket Sheet
  • Paper Gasket Sheet
  • High Temperature Gasket Sheet
  • Head Gasket Material Sheet
  • Exhaust Gasket Sheet
  • Fiber Gasket Sheet