EVOLUTION® Isolation Gaskets
The EVOLUTION® Isolation Gasket is GPT's patented, fully encapsulated flange isolation solution, developed to provide dependable electrical isolation, leak prevention, and long-term sealing performance in critical pipeline applications. Designed for use in oil and gas, petrochemical, water, and industrial systems, EVOLUTION® helps protect pipeline assets from corrosion while supporting effective cathodic protection programmes.
Unlike many conventional isolation gaskets, EVOLUTION® features a slim 1/8-inch (3 mm) profile, making installation easier and reducing many of the alignment and assembly challenges associated with thicker gasket designs. The fully encapsulated construction allows the gasket to remain in place during hydrostatic testing without compromising its electrical isolation properties.
At the heart of the design is a proprietary GPT coating specifically engineered for demanding oil and gas environments. This advanced material delivers outstanding resistance to impact, abrasion, and mechanical damage while maintaining performance when exposed to aggressive media commonly found in pipeline systems. The coating is resistant to H₂S, steam, CO, CO₂, and numerous corrosive chemicals encountered in upstream, midstream, and downstream operations.
EVOLUTION® has successfully achieved API 6FB fire test recognition across multiple sizes and pressure classes, demonstrating its ability to maintain sealing integrity under fire exposure conditions. The gasket also provides a significantly higher temperature capability than traditional GRE-based isolation gaskets, making it suitable for more demanding operating environments.
Unlike conventional GRE products that may be vulnerable to permeation, hydrolysis, chemical attack, thermal degradation, emissions, blowout, and fire-related failures, EVOLUTION® is engineered to provide enhanced reliability throughout the service life of the pipeline. Its advanced design helps minimize flange corrosion, improve sealing performance, and maintain electrical isolation in aggressive operating conditions.
The gasket's monolithic construction eliminates the laminated layers commonly found in many GRE isolation products. By removing the risk of delamination, EVOLUTION® offers improved structural integrity, increased durability, and reliable performance in high-pressure applications.
When installed with mica insulating sleeves and washers, EVOLUTION® is suitable for operating temperatures up to 500°F (260°C). Extensive qualification testing has been completed, including successful API 6FB 3rd Edition Fire Testing, providing confidence in safety-critical and high-consequence service applications. Learn more in our Case Studies.
Features & Benefits
- Fully encapsulated isolation gasket design
- Maintains electrical isolation during hydrostatic testing
- Supports cathodic protection and corrosion mitigation programmes
- API 6FB 3rd Edition fire-tested performance
- Superior resistance to H₂S, CO₂, steam, CO, and aggressive chemicals
- Higher temperature capability than conventional GRE isolation gaskets
- Monolithic construction eliminates delamination concerns
- Enhanced leak prevention and flange corrosion protection
- Suitable for critical pipeline sealing and isolation applications
- Available across multiple sizes and pressure classes
Applications
- Fire-safe flange insulation in conjunction with cathodic protection
- Insulation between dissimilar metals to prevent galvanic corrosion
- Wellhead isolation from inter-connected flow lines
- Valve connections
- Christmas Tree connections
- Pump connections
- Compressor connections
- Mating mismatched ring-joint to raised-face flanges (EVOLUTION® will seal in ring-joint, raised-face and flat face/slip-on flanges)
- Eliminate fluid trap corrosion between ring-joint (RTJ) flanges where high concentrations of CO2, H2S and other aggressive hydrocarbon media are present
- Eliminate turbulence and flow-induced erosion between ring-joint (RTJ) flanges.
- Full Face (Type E) Available
- To seal between flanges subjected to vibration/cavitation (i.e., compressor stations).
- For slip-on flanges and coated flanges, please contact GPT engineering
- Some smaller diameter sizes, EVOLUTION® may be supplied with C-ring only