We manufacture Spiral wound gaskets which are semi-metallic, comprising of a spirally wounded preformed metal strip and a nonmetallic filler material, such as graphite or PTFE on the outer periphery of the inner ring and superposed metal with non-metallic windings are continually wound until the required outer diameter is attained.
The spiral wound gasket is commonly used with flange surface finishes created using Mirage flange facing machines. These gaskets used in the oil, gas and petrochemical industries are engineered to cope with high pressures, extreme temperatures and chemical attack. Fluctuations in the above, along with temperature differential across the flange face and bolt stress relaxation, demand a gasket with flexibility and recovery.
The need for the gasket to recover from changing conditions cannot be overemphasized.
Spiral wound gaskets (SPW Gaskets) can be used over the complete temperature range from cryogenic to approximately 2000°F and in all pressures from vacuum to the standard 2500 psi flange ratings, They are more resilient than any other type of metallic gasket with higher flexibility and recovery characteristics to maintain a seal under variable working conditions.
Also on the gasket, is a solid outer ring used for centring and controlling compression. This minimizes the risk of material creeps through over-tightening.
For the toughest conditions, spiral wound gaskets are available with an additional inner ring. This protects the windings (particularly the filler), from contamination, or attack by the product travelling past the pipeline joint.