Spiral Wound Gaskets

Spiral wound gaskets have extremely strong sealing capacity and are used across many different industries:

Their versatility and the fact that they have the ability to handle temperature and pressure fluctuations means that they can be adapted to suit most operating conditions and applications.
Spirals are ideal for very high pressure applications or in very corrosive or high temperature environments such as pipelines in the chemical and petroleum industries. The gaskets can seal fluid pressures up to 250 bar and have a temperature range of between minus 200˚C to 1000˚C.
Spiral wound gaskets are formed using a combination of soft nonmetallic packing or flexible graphite non asbestos or PTFE materials and winding strips of metal which are alternatively wound on the outer edges of winding mandrels. The inner ring and outer ring winding materials typically used are carbon steel and stainless steel 304, 316, and 316L.
The gaskets can also be manufactured with variable densities, i.e. relatively low density gaskets for vacuum service up to extremely high density gaskets having a seating stress of approximately 30,000 psi. They are easy to install and remove and will not cause damage to the flange surfaces.
Spiral wound gaskets must be sized to ensure the spiral wound component is seated between flange surfaces. If it protrudes beyond a raised face or into a flange bore, mechanical damage and leakage may occur.

How They Fit

Spiral wound gaskets rely on the mechanical characteristics of a formed metal spiral strip, rather than the compressive characteristics of more traditional gasket materials. Spiral wound gaskets comprise a mix of metallic and soft non-metallic packing material. This results in alternating layers of filler and metal. The filler material in these gaskets acts as the sealing element, with the metal providing structural support.
The construction of these gaskets provides for excellent sealing especially to the static sealing element of pipe, valve, pump, thermal exchange, condensing motorcycle, auto vent-pipe, tower ,plain hole and hole of flange, etc.

Styles of Spiral Wound Gaskets

Spiral wound gaskets are manufactured in three styles, and all manufactured to ASME B 16.20 Standard.

Standard Gaskets – Carbon or S/S outer ring only

This is the most common choice for RF and FF flanges.

Inner Ring Gaskets –As per Standard Gasket but with inner ring also, usually S/S

This is a standard gasket with an additional inner ring fitted to provide an additional compression stop. This construction means that the sealing element is protected from heat and corrosion. Inner rings are standard on all gaskets NPS 24” class900#, NPS 12” and above in 1500# and NPS 4” and above in 2500#. All spiral wound gaskets with PTFE filler have inner rings fitted.

Style R Sealing Gaskets

These gaskets are sealing elements only, although they have several additional layers of winding strip for use in tongue and groove and male/female flanges. They are also available in oval , round and diamond shape for valve bonnet and handhole applications, 3.2mm and 4.5mm thick.