|Facing Material||Maximum Temperature|
|Mica & Graphite, Zonal||900°C|
Spiral wound gaskets have the ability to recover under the action of fluctuating loads caused by process fluid pressure and temperature changes, flange face temperature variations, flange rotation, bolt stress relaxation and creep.
The gasket-sealing element on the spiral wound gaskets consists of a pre-formed metallic winding strip with layers of a softer, more compressible sealing material which, during compression, is densified and flows to fill imperfections in the flange surfaces when the spiral wound gasket is seated. The metal strip holds the filler giving the spiral wound gasket mechanical resistance and resilience.
Style GR – Utilises an external ring which accurately centres the sprial wound gasket on flange face, provides additional radial strength to prevent gasket blow-out and acts as a compression stop. A general purpose gasket suitable for use with flat face and raised face flanges up to and inclusive of class 2500. Above class 600 an internal ring is recommended.
Style GRI – A Style GR spiral wound gasket fitted with internal ring which gives an additional compression limiting stop and provides heat and corrosion barrier protecting gasket windings and preventing flange erosion. Suitable for use with flat face and raised face flanges and specified for high pressure/temperature service – class 900 and above or where corrosive or toxic media are present.
Style G – Basic construction type. Inner and outer diameters are reinforced with several piles of metal without filler to give greater stability and better compression and sealing characteristics. Suitable for tongue and groove or male and female or grooved to flat face flange assemblies.
Style GIG – Solid inner metal ring acts as a compression stop and fills the annular space between flange bore and the inside diameter of the gasket. Designed to prevent accumulation of solids, reduce turbulent flow of process fluids and minimise erosion at flange faces. Suitable for male and female pipe flanges.