Spiral Wound Gasket

Spiral wound gaskets are manufactured by spirally winding a V-shaped metal strip and a strip of non-metallic filler material. The metal strip provides outstanding recovery, while the flexible filler guarantees excellent sealing. Spiral wound gaskets can be reinforced by an outer and  inner ring. The outer centring ring controls the compression and holds the gasket centrally within the bolt circle. The inner ring increases the axial rigidity and resilience of the gasket.

Spiral wound gaskets can be used for sealing flange joints, manhole and handhold covers, tube covers, boilers, heat exchangers, pressure vessels, pumps, compressors and valves; in industries such as petrochemical, pharmaceutical, shipbuilding, and food processing, in power industries and nuclear power stations. They are ideal for steam, oil, liquids, gases, acids, alkalines, various organic media and solvents.

 Types of spiral wound gaskets

Basic construction type, without the inner and outer ring. Suitable for tongue and groove, male and female or grooved to flat face flange assemblies.
Solid inner metal ring acts as a compression stopper. To prevent accumulation of solids, reduce turbulent flow of process fluids and minimize erosion, damages of gasket between flange bore and the inside diameter, the annular space is filled up by solid inner metal ring.  Suitable for male and female pipe flanges.
Solid outer ring accurately locates the gasket on the flange face to give the additional radial strength to prevent the gasket blowout and acts as a compression limiter. In case of installing the outer ring, it is very easy to install the gasket to flange face because the end of outer ring will touch at bolts – Suitable for use with flat face and raised face flanges. For class 900 and above an internal ring is recommended.
A inner ring and outer ring type gasket will give an additional compression limiting stopper for gasket inner and outer side. It will prevent the corrosions on flange face at annular space. – Suitable for use with flat face and raised face flanges and specified for high pressure and temperature service – Class 900 and above or where corrosive or toxic media are present.
Materials for spiral wound gasket

 

Inner & Outer Rings

  • Carbon steel
  • Stainless Steel
  • Monel
  • Nickel
  • Hastelloy Alloy

Metal Strip

  • Stainless Steel
  • Monel
  • Nickel
  • Hastelloy Alloy

Filler Materials

  • Graphite
  • Non-asbestos
  • PTFE
  • MICA
  • Ceramic