Type F Insulation Gasket

Type F Insulation Gasket

Core Features

  • Precision “Ring-Joint” Design: The Type F gasket is specifically engineered to fit within the bolt circle of the flange. It is designed to sit exclusively on the raised-face portion of the flange, ensuring that the insulating material is not exposed to external environmental contaminants.
  • High-Dielectric Strength: Manufactured from premium insulating materials such as G-10 (Epoxy Glass), G-11, or Reinforced Phenolic. These materials provide a high-resistance barrier that effectively stops the flow of galvanic current between dissimilar metal flanges.
  • Controlled Compression: The gasket is sized to the Inner Diameter (ID) and the Bolt Circle’s Inner Diameter. This “Ring Type” configuration allows for high-sealing pressures on the raised face without the risk of the gasket “walking” or shifting during high-torque bolting.
  • Near-Universal Chemical Resistance: Depending on the face seal material (Nitrile, Viton, or PTFE), Type F gaskets are compatible with a wide range of media, including hydrocarbons, sour gas, and aggressive chemicals.
  • Complete Kit Integration: As part of an I.K. Set, the Type F gasket is supplied with full-length Insulating Sleeves (Mylar, Nomex, or G-10) and Insulating Washers, providing 360-degree electrical isolation for each bolt.

At Kriloha Ltd., we recognize that in pipeline integrity, “Isolation” is the first line of defense against the silent destruction of corrosion. A failed insulation kit can lead to rapid metal loss and catastrophic leaks. The Kriloha Type F Insulation Gasket is our engineered answer for “Internalized Protection.” As a premier global provider of flange isolation technology, Kriloha Gaskets has mastered the Precision Machining required to produce gaskets that fit perfectly within the bolt circle of any standard ANSI, API, or DIN flange.

The engineering of our Type F series is based on Dielectric Reliability. Unlike full-face gaskets (Type E), the Type F design is protected by the bolts themselves, making it less susceptible to accidental damage during handling. At Kriloha, we often incorporate a Spring-Energized PTFE or Viton Seal into the face of the insulating retainer. This “Dual-Seal” technology ensures that while the G-10/G-11 body provides the electrical gap, the elastomer seal provides the “Bubble-Tight” fluid containment, even under fluctuating pressures.

Manufacturing these kits at Kriloha involves strict Dielectric Breakdown Testing. We ensure every material batch meets the required Kilovolt (kV) resistance standards. Whether you are isolating a high-pressure gas header or a municipal water main, Kriloha Type F Insulation Gaskets provide the mechanical invincibility and electrical agility your facility demands. By choosing Kriloha Ltd., you are investing in a “Corrosion-Zero” technology that significantly extends the lifespan of your critical infrastructure.

Primary Use Cases

  • Cathodic Protection Systems: The essential component for isolating pipeline segments to ensure that cathodic protection currents remain focused on the intended buried or submerged sections.
  • Dissimilar Metal Flanges: Preventing “Galvanic Corrosion” where a stainless steel pipe meets a carbon steel flange or other mixed-metal junctions.
  • Oil & Gas Transmission Lines: Providing long-term electrical isolation in high-pressure transport lines to prevent electrochemical degradation.
  • Water & Wastewater Treatment: Isolating pumps and valves from the main pipeline to prevent stray current interference and localized pitting.
  • Refinery & Petrochemical Plants: Sealing and isolating critical heat exchangers and pressure vessels.

FAQs

What is the main difference between Type F and Type E?

Type E (Full Face): Covers the entire flange face, including the bolt holes. It is easier to center but more exposed to the environment.

Type F (Ring Type): Fits only inside the bolt circle. It is better protected from external moisture and easier to install in existing tight-clearance pipelines.

Can I use a Type F gasket with flat-face flanges?

It is generally recommended for Raised Face (RF) flanges. For flat-face (FF) flanges, a Type E (Full Face) is typically preferred to prevent flange rotation or stress.

What is the temperature limit for G-10 vs. G-11?

G-10 (Standard): Suitable for temperatures up to +130°C to +150°C.

G-11 (High-Temp): Retains its mechanical strength and insulation properties up to +180°C to +200°C.

Are the sleeves and washers included?

Yes. A Kriloha “I.K. Set” (Insulation Kit Set) includes the Type F gasket, one insulating sleeve per bolt, two insulating washers per bolt, and two plated steel washers per bolt.

How do I ensure a proper seal during installation?

Clean the flange faces thoroughly. Because Type F gaskets are “Ring Type,” careful centering is required. Tighten bolts in a “star” pattern to the torque specifications provided by Kriloha to ensure uniform compression of the insulating retainer and the seal.

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