Gaskets and Sheet Jointings

Metcom gasket

This modified graphite gasket is certified for emission control applications. It comprises a thin corrugated steel joint with pressed concentric grooves 6 mm wide. Two adjacent grooves on either side are filled with beads of expanded-graphite Supagraf Tape - either standard or high purity grades, depending on application. When compressed between flanges, the metal corrugations provide a sealing capability that is enhanced by the graphite beads, therefore making for a modified version of a graphite gasket that comes with its own advantages.

Typical applications
Pipelines and pressure vessels with Class 150 to 2500 flanges, or equivalent.

Prime features

  • Thinner than a spiral wound gasket - it can usually be fitted in place of a sheet jointing gasket in a pipe run.
  • Self-locating, and often easier to install than a sheet graphite gasket.
  • When supplied with tapered-slot lugs, this gasket can be used on a variety of flanges with differing bolt diameters and pitch circles.

Metcom Type FG316L gasket is certified as meeting TA-Luft emission control requirements.

Physical properties

  • Standard metal cores in a selection of stainless steels. Other alloys are available.
  • Supagraf graphite thickness: 0.35 mm to 0.5 mm
  • Nominal overall thickness (uncompressed): 1.5 mm
  • Compressed thickness: 0.5 mm

Service capabilities

  • Maximum temperature (oxidising media): 500°C.
  • Maximum temperature (non-oxidising): 550°C.
  • Maximum temperature (steam): 650°C.
  • Pressure range (temperature dependent): Vacuum to 40 MPa/400 bar.

Optional groove filler material
PTFE is available for agggresive chemical conditions, but restricted service capabilities apply. Please consult our technical support team for assistance.

How it is supplied

  • Multi-flange configuration: 1/2-inch to 12-inch, Classes 150-2500.
  • Individual flange configuration: 1/2-inch to 24-inch, Classes 150-2500.
  • Other sizes on application.

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