Insulated Gasket

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Insulated Gasket

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Insulated Gasket

Insulated (or isolation) gaskets are critical components in the maritime sector used to prevent galvanic and stray-current corrosion between dissimilar metals (e.g., steel to copper-nickel) and to maintain cathodic protection. They act as a physical barrier while utilizing dielectric materials to electrically separate flange connections.

Key Components & Standards

An insulation kit consists of the central gasket, insulating sleeves for the bolts, and isolating washers to prevent the nuts from shorting the connection. Common gasket types include Type E (full-face) and Type F (raised-face). Standard retainer materials include Glass-Reinforced Epoxy (GRE) such as G-10 or G-11, combined with specialized sealing elements like spring-energized PTFE. These components are designed and manufactured to comply with strict dimensional and performance parameters outlined in ASME B16.5 (for flanges) and API 6A/6D (for pipelines).

Sourcing & Procurement

Sourcing these gaskets requires precise verification of operating temperatures, pressures, and fluid compatibility (such as seawater, hydrocarbons, or inert gases). Marine operators must ensure suppliers provide verifiable mill certificates, dielectric strength ratings according to ASTM D149, and corrosion-resistant hardware. Leading manufacturers supply type-approved products for marine and offshore applications, often offering custom designs for high-pressure systems.