Spiral wound gaskets are special semi-metallic gaskets of great strength and resilience. Manufactured by spirally winding V-shaped metal strips and strips of non-metallic filler with good sealing characteristics, they are suitable for use under heavy operating conditions at high temperature and pressures. Applications include the sealing of flange joints, boilers, heat exchangers, valves and pressure vessels. Inner rings and outer rings may be added to reinforced the gasket. A range of metals and filler materials are available to suit different applications. Standard Tesitallic spiral wound gaskets are made to fit ANSI B 16.5 and BS 1560 flanges. Spiral wound conforming to ASME B16.20 specification on request. Colour coding to industry standard is available. Nominal thickness available is 4.5mm and 3.2mm. Special request is required for a nominal thickness of 6.4mm. Non standard spiral wound gaskets are available in various dimension and shapes for use as flange gasket, manhole gasket, handhole gasket or other applications. Spiral wound gaskets is only suitable for circular or moderately non-circular shapes.Limitations on size and shape largely depends on practical considerations in the manufacture of the gasket.
Material Selection Table |
Component
|
Material Type
|
Application Remarks
|
Metal strips & rings
|
Stainless Steel SUS 304
|
450 oC good corrosion resistance
|
Metal strips & rings
|
Stainless Steel SUS 304L
|
450 oC high corrosion resistance
|
Metal strips & rings
|
Stainless Steel SUS 316
|
630 oC good corrosion resistance
|
Metal strips & rings
|
Stainless Steel SUS 316L
|
630 oC high corrosion resistance
|
Metal strips only
|
Monel
|
630 oC very high corrosion resistance. Not for use in high sulphur atmospheres
|
Rings only
|
Carbon Steel
|
For general use
|
Filler
|
Compressed Asbestos
|
500 oC good chemical resistance
|
Filler
|
Graphite
|
630 oC good chemical resistance
|
Filler
|
PTFE
|
300 oC excellent chemical resistance. For use in food and potable water application
|
|
Standard Spiral Wound Dimension Tables