Basic construction, inner and outer diameters are reinforced with several piles of metal without filler to give greater stability and better compression characteristics. Suitable for tongue and groove or male and female or grooved to flat face assemblies.
Solid inner metal ring acts as a compression stop and fills the annular space between flange bore and the inside diameter. Designed to prevent accumulation of solids, reduce turbulent flow of process fluids and minimize erosion of flange faces.Suitable for male and female pipe flanges.
Utilizes an external ring which accurately centers gasket on flange face: provides additional radial strength to prevent gasket blowout and acts as a compression stop. A general purpose gasket suitable for use with flat face and raised face flanges.
Suitable for use with flat face and raised face flanges and specified for high pressure/temperature service or where corrosive or toxic media are present.
Note on use of inner rings: ASME B16.20 which covers spiral wound gaskets requires the use of solid metal inner rings in:
- Pressure Class 900, nominal pipe sizes 24” and larger
- Pressure Class 1500, nominal pipe sizes 12” and larger
- Pressure Class 2500, nominal pipe sizes 4” and larger
- All PTFE filled Spiral Wound gaskets.
ASME B16.20 recommends the use of inner rings if the user’s experience has shown inward buckling of the gasket.
Flexitallic recommends the use of inner rings for the following applications:
- Vacuum service or suction side of rotary equipment such as pumps and compressors.
- Aggressive media, high pressure or temperature.
- Surface finishes smoother than 125 micro-inch.
- If over compression of the gasket is a concern.
It is customary to select inner ring material to be the same as the metal winding.
Style HE gaskets are used for heat exchangers where pass bars may be required. The outer portion is of standard spiral wound construction, whereas the rib partition is normally of single or double jacketed style, securely fastened to the I.D. of the spiral wound portion.
This style is identical to the Style HE, except that it is fitted with an outer guide ring.
Note-Style HE and Style HE-CG gaskets have a primary seal of spiral wound construction with its inherent resiliency and excellent sealing quality. It is necessary that dimensional drawings locating the pass ribs and the configurations be submitted for all inquiries and orders for these style gaskets.
Style HE-CGI With Spiral Wound Outer Ring
The Style HE-CGI is a variation of the style CGI spiral wound gasket, developed for use on heat exchanger TEMA type flange arrangements. In conjunction with an inner ring, the standard spiral wound construction also supports an outer wound steel nose, designed for the purpose of accurate gasket location. It is also available with solid metal outer ring.
This style designates a specially sized CG gasket to be used on standard ring joint flanges. The outer ring is dimensioned to cover the ring joint grooves and to prevent the spiral wound portion from entering the groove. This type of gasket should be used only as a maintenance repair item.
The carrier ring gasket consists of two spiral wound gaskets placed in a specially machined metallic ring. The major advantages of the carrier ring are its high recovery, and ease of handling compared to standard spirals.
Style 625 spiral wound gaskets are similar to Style R gaskets, with a thickness of 0.0625”. These gaskets are widely used wherever space restrictions indicate the need for a wafer thin gasket design capable of sealing high pressures.
These gaskets are used for boiler handhole and tube cap assemblies. They are available in round, oval, obround, square, pear and diamond shapes. Please note Style T gaskets rely on internal pressure in the boiler to properly seat the gasket. This means, when a hydrostatic test is performed on the gasket, the pressure exerted against the plate will further compress the gasket-and it is necessary to tighten each nut to compensate for the additional compression of the gasket under load.
Style M, MC & MCS
These styles are designed for boiler manhole cover assemblies. They are usually round, obround or oval shape, depending of course , upon the manhole plate configuration. Style MC gaskets have pre-formed inner and/or outer rings made of spiral windings. This centering guide permits the gasket to assume its correct position and to compensate for inequalities in plate contours and fillets in cold-pressed plates as well as to prevent shouldering and pinching caused by radial misplacement. Style MCS gaskets are manufactured with a solid metal inner and/or outer ring which also prevents over compression of the gasket in high pressure systems.
Style LS & LSI
The style LS spiral wound gasket has been engineered by Flexitallic to provide an alternative to sheet gaskets in Class 150 and Class 300 service. Style LS gaskets have the inherent strength, resiliency and blowout resistance of spiral wound gaskets, yet require low bolt load for seating. They are manufactured with high purity Flexicarb flexible graphite filler or PTFE filler for optimum sealability, and are available for the full range of standard Class 150 and Class 300 flanges, as well as other non-standard low pressure flanges. US PATENT 5161807.