Manhole Gasket (GCF-105-IG Style)

Manhole Gasket (GCF-105-IG Style)

Core Features

  • Reinforced Mineral Fiber Matrix: Constructed from high-density, texturized Mineral Fibers (inorganic rock/glass microfibers) integrated with a high-strength Inconel wire mesh for maximum blowout resistance and structural integrity.
  • Graphite Saturated & Coated: The mineral fiber structure is deeply impregnated with high-purity flexible graphite and finished with an external graphite coating to provide superior sealing and anti-stick properties.
  • Extreme Thermal Resilience: Specifically engineered for high-heat environments, maintaining its sealing “bite” at continuous operating temperatures up to 650°C (1200°F).
  • Superior Conformability: The soft, compressible mineral fiber core allows the gasket to conform perfectly to irregular, pitted, or “bowed” surfaces common on older boiler manway plates and handhole covers.
  • Anti-Corrosion Chemistry: Formulated with passive corrosion inhibitors to protect the seating surfaces of the pressure vessel from pitting or galvanic corrosion during long-term service.
  • Non-Sticking Surface: The heavy graphite finish ensures the gasket releases cleanly from the metal during inspections, eliminating the need for aggressive scraping or chemical cleaners.

At Kriloha Ltd., we understand that a manhole seal is a critical safety boundary. When a boiler is brought up to full pressure, the gasket must manage both extreme heat and the mechanical “shifting” of the manway plate. The Kriloha Manhole Gasket (SUNWELL GCF-105-IG Style) is our heavy-duty solution for steam-side reliability. As a premier global supplier of high-performance seals, Kriloha Gaskets has mastered the “Wire-in-Fiber” technology to ensure your vessel stays leak-free from start-up to blow-down.

The engineering of the GCF-105-IG style centers on Elastic Compression. We utilize Inconel wire reinforcement because of its superior strength at “red-heat” temperatures. This wire is braided into a high-bulk mineral fiber carrier and then vacuum-impregnated with flexible graphite. The graphite acts as the primary sealing medium, flowing into the microscopic pits of the seat, while the mineral fiber and Inconel provide the “mechanical backbone” that prevents the gasket from being extruded by internal pressure.

Manufacturing these gaskets at Kriloha involves a precision Die-Forming process. We produce these in standard elliptical sizes (e.g., 11″x15″, 12″x16″) as well as custom round or obround shapes. Every gasket is inspected for “Density Consistency” to ensure it doesn’t “thin out” in one spot under load. By choosing Kriloha Ltd., you are investing in a “High-Integrity” seal that reduces the risk of “steam-cuts” on your expensive boiler seats and ensures a fast, safe return to service during every maintenance cycle.

Primary Use Cases

  • Steam Boiler Manholes: The industry standard for sealing large elliptical or round manway openings on high-pressure steam boilers.
  • Boiler Handholes & Inspection Ports: Providing a reliable, easy-to-install seal for smaller access points in water-tube and fire-tube boilers.
  • Hot Water Storage Tanks: Ideal for large-scale commercial calorifiers where frequent inspection and high thermal stability are required.
  • Economizer Access Doors: Resisting high-heat flue gases and thermal cycling in the exhaust sections of industrial boilers.
  • High-Pressure Process Vessels: Used in chemical and food processing for large-diameter access ports on steam-jacketed equipment.
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FAQs

What is the benefit of the IG (Inconel-Graphite) style over standard fiber gaskets?

Standard fiber gaskets are often limited to lower temperatures. The GCF-105-IG style combines the heat resistance of mineral fibers with the strength of Inconel, making it a high-performance steam gasket that can handle much higher pressures without hardening.

Does this gasket require any sealant or “Gasket Goo”?

No. The heavy graphite coating is designed to seal “dry.” Applying grease or sealants can interfere with the graphite’s ability to conform to the seat and may cause the gasket to slip during installation.

Are these gaskets reusable?

Kriloha strongly recommends using a new gasket every time the manway is opened. While the metal reinforcement stays intact, the graphite-mineral fiber structure is permanently compressed during the first use to create the seal.

How do I specify the correct size?

You need three measurements: the Inside Diameter (ID – Long and Short axis), the Flange Width (the thickness of the ring), and the Gasket Thickness (usually 1/4″ or 3/8″).

What if my boiler seat is pitted or uneven?

The GCF-105-IG style is specifically designed for this. Its high compressibility (up to 30-40%) allows it to “fill in” the low spots on a worn seat better than a rigid spiral wound or metallic gasket.

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