Class 300 CGI 304 SS / Graphite Spiral Wound Gasket

Product Highlights

• Teadit Style 913M spiral wound gasket configuration
• Designed for compatible ASME Class 300 flange systems
• 304 stainless steel metallic winding
• 304 stainless steel inner ring
• Flexible graphite sealing filler
• Carbon steel outer centering ring
• Alternating metal and soft sealing-material construction
• Inner ring provides additional compression limitation
• Inner ring helps reduce turbulence at the gasket bore
• Inner ring can provide added protection against corrosion or erosion at the bore
• Outer ring assists with gasket centering during installation
• Suitable for demanding industrial pressure and temperature applications when properly specified
• Available in nominal sizes from 1/2" through 12" on this product family

A spiral wound gasket is constructed from alternating layers of formed metallic winding and compressible sealing filler. The metallic winding provides mechanical strength, resilience, and recovery while the soft filler material conforms to the flange sealing surfaces to help create an effective seal.

Teadit's Style 913 uses a spiral wound sealing element with an outer centering ring. Style 913M adds an inner ring to the standard Style 913 configuration.

The inner ring provides additional support at the gasket bore and serves several important functions including compression limitation, reduction of turbulence in the process flow, and added protection against corrosion or erosion in the area between the flanges.

The inner ring distinguishes Style 913M from the standard Style 913 configuration and provides additional support and compression control at the inside diameter of the gasket.

• Acts as an additional compression limiter
• Supports the inside diameter of the spiral wound element
• Helps prevent inward movement or buckling of the winding
• Helps fill the space between mating flange bores
• Can reduce turbulence in the process-media flow
• Can help protect against corrosion and erosion at the gasket bore
• Provides additional stability for demanding flange applications

Teadit notes that inner rings are normally required on ASME-standard spiral wound gaskets using flexible graphite filler unless otherwise specified by the purchaser.

The outer centering ring helps position the spiral wound sealing element correctly between mating flanges before the bolts are tightened.

• Centers the gasket inside the flange bolt circle
• Helps position the sealing element over the correct flange sealing area
• Provides protection to the spiral wound element during handling
• Helps simplify gasket positioning during installation
• Provides additional structural support to the gasket assembly

Teadit identifies flexible graphite as one of the available filler materials for its Metalflex spiral wound gasket family and publishes a maximum filler-material temperature of approximately 842°F / 450°C.

This temperature value applies to the filler material and should not be interpreted as an unconditional operating rating for every completed gasket installation.

Actual gasket suitability depends on the entire gasket construction, process media, operating pressure, flange materials, bolting, temperature cycling, installation conditions, and applicable engineering requirements.

In spiral wound gasket terminology, the Teadit Style 913M uses the same general four-component configuration commonly associated with a spiral wound gasket having both an inner ring and an outer centering ring.

For this product, the construction is:

• Winding: 304 Stainless Steel
• Inner Ring: 304 Stainless Steel
• Filler: Flexible Graphite
• Outer Ring: Carbon Steel

Always order by the required manufacturer style, material combination, nominal flange size, and pressure class rather than relying solely on equivalent terminology from another gasket manufacturer.

Teadit states that standard pipe-size Style 913 and 913M spiral wound gaskets are manufactured to applicable ASME B16.20 requirements.

The gasket should be selected to match the exact nominal flange size, pressure class, and service requirements of the piping system.

The variations offered on this GetPipe.com product are configured for compatible ASME Class 300 flange systems.

Do not select a gasket based only on nominal pipe diameter. Before ordering, verify:

• Nominal flange size
• Pressure class
• Flange configuration
• Process media
• Operating temperature
• Operating pressure
• Gasket material requirements
• Applicable piping specification

Proper flange condition is critical to achieving a dependable spiral wound gasket seal. Flange surfaces should be clean, properly aligned, and free of excessive corrosion, scoring, old gasket material, debris, and other damage that could interfere with gasket compression.

The GetPipe technical CGI / inner-ring spiral wound gasket cut sheet provides additional reference information regarding gasket design parameters, dimensional tolerances, compression guidance, and flange surface-finish considerations.

• Confirm the exact nominal flange size before ordering.
• Verify the flange is Class 300.
• Confirm that the 304 / 304 / flexible graphite / carbon steel material combination is suitable for the intended service.
• Verify chemical compatibility with the process media.
• Confirm actual system pressure and temperature requirements.
• Inspect both flange faces before installation.
• Remove old gasket material, corrosion, dirt, grease, and foreign material.
• Inspect flange faces for excessive scoring or mechanical damage.
• Verify proper flange alignment before installing the gasket.
• Center the gasket carefully inside the flange bolt circle.
• Do not force the gasket into a misaligned flange assembly.
• Use properly sized and rated bolts, studs, nuts, and washers.
• Tighten flange bolts using an approved cross-pattern and multiple-pass procedure.
• Apply the specified bolt load or torque for the flange, gasket, bolting, and service conditions.
• Do not reuse a spiral wound gasket after it has been compressed.
• Pressure-test and inspect the completed flange connection before placing it into service.
• Installation should be performed by qualified personnel familiar with bolted flange assemblies.