Type MCHG (Modified Critical High Pressure) Insulation Gasket

Type MCHG (Modified Critical High Pressure) Insulation Gasket

Core Features

  • Dual-Seal Engineering: The MCHG (Modified Critical High Pressure Gasket) is a sophisticated evolution of the standard CHG design. It features a Stainless Steel 316 core bonded with G-10 or G-11 Epoxy Glass, but with a modified sealing face that incorporates both a primary spring-energized PTFE seal and a secondary fire-safe or environmental backup.
  • High-Modulus Laminate: Utilizing a high-density G-10 retainer, the MCHG offers extreme compressive strength (up to 65,000 PSI). This allows the gasket to maintain its structural and electrical integrity even under the massive bolt loads required for Class 2500# or API 10,000 PSI flanges.
  • Modified Groove Geometry: The “Modified” aspect of the MCHG refers to a proprietary groove design that prevents seal “roll-out” during high-velocity gas flow. This makes it the preferred choice for injection lines where “searching gases” like Hydrogen or CO2 are transported at high pressures.
  • Zero-Wicking Technology: The G-10/G-11 surfaces are engineered with a hydrophobic finish, ensuring that moisture cannot penetrate the laminate. This prevents “electrical tracking” and ensures that the cathodic protection (CP) remains 100% effective in submerged or high-humidity environments.
  • Thermal Expansion Matching: The expansion coefficient of the MCHG’s metallic core is precision-matched to standard carbon steel piping. This prevents the “breathing” effect during thermal cycling, which can cause standard phenolic gaskets to leak or lose electrical isolation.

At Kriloha Ltd., we recognize that as energy infrastructure pushes into deeper waters and higher pressures, the demands on “Isolation” become absolute. A standard insulation kit is a consumable; the SUNWELL MCHG is a structural asset. As a premier global provider of high-integrity seals, Kriloha Gaskets recommends the MCHG for applications where the cost of a leak—either fluid or electrical—is catastrophic.

The engineering of our MCHG series is based on Dynamic Containment. While traditional gaskets are static, the MCHG is “Live.” The spring-energized elements react to pressure surges, ensuring that the seal face is always under positive tension against the flange. At Kriloha, we utilize a specialized vacuum-bonding process to fuse the G-10 laminate to the steel core, creating a single, inseparable unit that resists delamination even during rapid gas decompression (RGD).

Manufacturing these kits at Kriloha involves strict Acoustic Emission and Dielectric Testing. We ensure that the MCHG provides a total electrical break of over 20 Mega-Ohms even when fully torqued. Whether you are isolating a high-pressure subsea manifold or a critical refinery header, SUNWELL MCHG Insulation Gaskets provide the mechanical invincibility and electrical agility your facility demands. By choosing Kriloha Ltd., you are investing in a “Future-Proof” technology that secures your highest-value infrastructure against the twin threats of corrosion and high-pressure failure.

Primary Use Cases

  • Ultra-High Pressure Gas Injection: The gold standard for EOR (Enhanced Oil Recovery) lines where CO2 or Nitrogen is injected at pressures exceeding 5,000 PSI.
  • Hydrogen Service Pipelines: Providing a “Gas-Tight” seal for hydrogen transport, where the molecule size requires a superior spring-energized PTFE barrier.
  • Critical Subsea Tie-ins: Used in subsea manifolds where the gasket must provide decades of maintenance-free electrical isolation against aggressive seawater.
  • High-Vibration Compressor Stations: The MCHG’s metallic core provides the fatigue resistance necessary for flanges located near heavy rotating equipment.
  • Extreme Sour Service: Fully NACE MR0175 compliant for use in the most aggressive H2S environments found in global production.
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FAQs

What is the “Modified” difference in the MCHG?

The MCHG features a Reinforced Sealing Groove and often a secondary environmental seal. This prevents the primary seal from being dislodged by high-velocity gas and provides an extra layer of protection against external contaminants.

Can the MCHG handle Rapid Gas Decompression (RGD)?

Yes. The high-bond strength between the steel core and the G-10 laminate, combined with specialized RGD-resistant seals, makes the MCHG ideal for high-pressure gas applications where sudden pressure drops occur.

Is it compatible with API 6A flanges?

Absolutely. The MCHG can be custom-machined to fit the specific dimensions and pressure requirements of API 6A (Wellhead) and API 17D (Subsea) equipment.

How do I prevent “Shorting” during installation?

Because the MCHG is used in extreme-pressure lines, flange alignment is critical. Use the Kriloha G-10 Sleeves provided in the kit; these are significantly stronger than Mylar and will not crack under the high bolt loads required for MCHG gaskets.

What comes in the Kriloha MCHG I.K. Set?

The kit includes: (1) MCHG Gasket with Spring-Energized seals, (1) G-10 Insulating Sleeve per bolt, (2) G-10 Insulating Washers per bolt, and (2) Zinc-Plated (or Stainless) Steel Backup Washers per bolt.

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