Spiral Wound Gaskets

Spiral wound gaskets are used in bolted flange connections where a compressible seal is needed to accommodate flange surface irregularities and changes in operating conditions. They are commonly found in industrial piping, valves, pressure vessels and heat exchanger flange connections.

A typical spiral wound gasket is made by winding a profiled metal strip together with a soft filler material. The metal winding provides structural support, while the filler helps the gasket conform to the flange sealing surfaces under compression.

Types of Spiral Wound Gaskets

Different flange arrangements call for different gasket constructions. The main types include:

Basic Type (R)

Consists of the spiral wound sealing element without inner or outer guide rings. It is generally used in applications where the gasket is properly confined within a suitable flange recess.

Outer Ring Type (CG)

Includes an outer guide ring to help position the gasket within the bolted flange connection and limit excessive compression. This construction is commonly selected for raised-face flanges.

Inner & Outer Ring Type (CGI)

Includes both an inner ring and an outer guide ring. The inner ring provides additional support at the inner diameter, while the outer ring helps with positioning and compression control. This design is used in applications where the inner ring is required by the applicable standard or service conditions.

Inner Ring Type (RIR)

Combines the spiral wound sealing element with an inner ring but no outer guide ring. It is used for suitable flange configurations where internal support is needed and gasket positioning is provided by the joint design.

Materials & Construction

Spiral wound gaskets are available with different winding metals and filler materials.

Common winding materials include stainless steel grades such as 304, 316 and 316L. Other alloys may be selected for specific service conditions.

Flexible graphite and PTFE are widely used filler materials. Graphite is commonly selected for industrial applications involving elevated temperatures, while PTFE is used where its chemical compatibility is suitable.

Inner and outer rings can also be supplied in different materials according to the gasket design and operating requirements.

Applications & Gasket Selection

Spiral wound gaskets are used in a range of industrial equipment, including:

• Pipeline flange connections

• Pumps and valves

• Heat exchanger flanges

• Pressure vessels

• Chemical processing equipment

• Industrial maintenance and replacement projects

The correct gasket depends on the flange standard, nominal size, pressure class, facing type and operating conditions. Material compatibility and the applicable gasket construction requirements should also be checked before ordering.

Custom Sizes & Bulk Supply

CORA SEALS supplies spiral wound gasket options for industrial maintenance contractors, equipment manufacturers, piping suppliers and distributors.

Standard and custom configurations can be reviewed according to customer drawings, specifications or samples.

Request a Quote

Send us your required gasket type, flange standard, nominal size, pressure class, materials and quantity. If you have a drawing or existing gasket specification, include it with your inquiry so we can review the requirements before quotation.