Carbon Steel Outer, Stainless Steel Inner, Graphite Filler Spiral Wound Gaskets: The Industrial Standard for High-Pressure Steam and Process Piping
When it comes to securing raised-face flanges in high-pressure, high-temperature environments, this specific Style CGI spiral wound gasket configuration is the industry workhorse.
Combining a rugged carbon steel outer ring, a corrosion-resistant stainless steel inner ring, and a highly adaptable flexible graphite filler, this gasket delivers an exceptional balance of safety, durability, and cost-efficiency.
It is engineered specifically for standard ASME B16.5 and B16.47 raised-face flanges, where severe pressure fluctuations and thermal cycling are common.
Key Feature Breakdown:
- Carbon Steel Outer Ring Painted or coated for corrosion resistance, this ring acts as a precision guide during installation. It aligns perfectly with the flange bolts and serves as a mechanical compression stop to prevent over-tightening.
- Stainless Steel Inner Ring: Typically crafted from 316L or 304 Stainless Steel, the inner ring is critical for high-pressure systems (Class 900 and above). It acts as an additional compression barrier, prevents the sealing elements from extruding inward, and shields the windings from turbulent, high-velocity fluid flow.
- Flexible Graphite Filler: Known for its outstanding thermal stability, graphite ensures a tight, gas-tight seal from cryogenic temperatures up to 450°C (840°F) in oxidizing atmospheres. It flows easily into flange micro-imperfections to seal perfectly under moderate bolt loads.
Ideal Applications:
- High-pressure steam lines and boiler feed-water systems.
- Refinery and petrochemical processes handling non-corrosive or mildly corrosive hydrocarbons.
- Utilities and power generation plants requiring dependable, standard-compliant sealing.
