Available in a full range of styles and materials, our spiral wound gaskets are manufactured in accordance with ASME B16.20 for use in all industry flanges, including ASME/ANSI B16.5, ASME B 16.47, Series A & B. American Seal & Packing assures strict adherence to these specifications as routine inspection procedures are applied throughout the manufacturing process. In addition, we maintain trace ability of all materials used in our gasket construction to provide material certifications as required.Normal Pressure: from 150# to 2500#Normal Diameter: from 1/2'' to 60''Usage: Flat and raised faced diameter flanges up to and inclusive of Class 2500.Technical Benefits: >Metallic winding suited for cyclic loading
>Outer ring center gasket
>Inner/outer ring provides additional blow-out strength
>Inner/outer ring provides a compression stop
>Prevents flange erosion
>Prevents inward buckling
>Reduces turbulent flow
>Recommended for high pressure/temperature applicationsApplicable Standards: >ASME B16.20
>Suited for ASME B16.47 series A/B flangesMetallic StripThe standard thickness of the metallic strip is 0.2 mm.FillerFiller is normally used for thickness from 0.5 mm to 0.6 mm.
- Flexible graphite
- AsbestosCentering ringThe centering ring does not come into direct contact with contained fluid. It is normally made of carbon steel and electro plated or painted to avoid corrosion. Other materials are available on request.Inner ringInner ring is used to avoid excessive compression due to high seating stress in high-pressure service and it is also used to reduce turbulence in the flange area. It is normally made of the same material as the gasket metallic srtip.Manufaturing sizesThis limitations are general and can vary according to the special customer.Thickness
The standard manufacturing thickness for spiral wound gaskets are: 3.2 mm; 4.5 mm; 6.5 mm (measured across metallic strip not including the filler, which protrudes slightly beyond the metal).
The tolerance of the gasket diameters (d1, d2, d3, d4, s, s1) are stipulated by ASME B 16.20 and DIN 2632-2638 standards. The gaskets designed for non-standard flanges meet the recommendations by the ASME B 16.20.
The dimensions of the standard SWG meet the ASME, BS and EN (DIN) standards.
Style CG - Utilizes an external ring which accurately centers 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. See note at bottom of page 8 for inner ring requirements.
Style CGI - A Style CG 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. See note at bottom of page 8 for inner ring requirements.
Style R - Basic construction type. Inner and outer diameters are reinforced with several plies 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.
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