Metal Jacketed Gaskets Suppliers for High-Pressure Industrial Sealing Solutions

Everything You Need to Know About Metal Jacketed Gaskets

In the demanding world of industrial sealing, where extreme pressures, temperatures, and corrosive media are commonplace, standard gaskets often fall short. This is where Metal Jacketed Gaskets come into play. As a cornerstone of reliable flange sealing in critical service applications, these gaskets offer a robust solution that combines the compressibility of a soft filler with the strength and resilience of a metal armor. At Kaxite Sealing, with decades of engineering expertise, we specialize in designing and manufacturing high-performance metal jacketed gaskets tailored to withstand your most challenging operating conditions.

A metal jacketed gasket is essentially a composite sealing element. It features a soft, pliable filler material—such as compressed non-asbestos fiber (CNAF), graphite, PTFE, or ceramic—fully encased in a thin, form-fitting jacket of metal. This construction delivers the best of both worlds: the metal jacket provides structural integrity, blow-out resistance, and protection for the filler from chemical and thermal degradation, while the soft filler ensures excellent conformability to flange surfaces, creating a tight, initial seal.

Key Applications and Industries

Metal jacketed gaskets are the seal of choice for numerous critical applications across a wide range of industries. Their design makes them particularly suitable for:

• Oil & Gas (Upstream, Midstream, Downstream): Wellheads, Christmas trees, manifolds, heat exchangers, and pipeline flanges handling crude oil, natural gas, and sour service (H2S) environments.
• Chemical & Petrochemical Processing: Reactors, columns, vessels, and piping systems involving aggressive acids, alkalis, solvents, and high-pressure reactions.
• Power Generation: High-pressure steam systems, turbine casings, boiler feedwater systems, and other high-temperature utility services in fossil fuel and nuclear plants.
• Pharmaceutical & Food Processing: Hygienic and sanitary applications requiring cleanability, non-contamination, and resistance to cleaning-in-place (CIP) chemicals, often utilizing stainless steel jackets with PTFE fillers.
• Marine & Offshore: Seawater cooling systems, fuel lines, and hydraulic systems on ships and offshore platforms where corrosion resistance is paramount.
• Pulp & Paper: Digesters, bleach plants, and chemical recovery units dealing with caustic liquors and high temperatures.

In-Depth Product Parameters & Specifications

At Kaxite Sealing, we engineer our metal jacketed gaskets to precise specifications. The performance is determined by the combination of jacket material, filler material, gasket style, and dimensions. Below is a detailed breakdown of our standard parameters.

1. Metal Jacket Materials

The jacket material is selected based on corrosion resistance, temperature capability, and cost. Common standards include ASTM, ASME, and DIN.

2. Filler Materials

The filler provides the seal. Selection depends on temperature, chemical compatibility, and required sealing force.

• Flexible Graphite: Superior temperature resistance (-400°F to 3000°F+ in inert atmospheres), excellent chemical resistance except strong oxidizers, low creep relaxation. Ideal for high-temperature steam and heat transfer fluids.
• Compressed Non-Asbestos Fiber (CNAF): Aramid, glass, and elastomer binders. Good general-purpose performance for water, oil, gases, and moderate chemicals up to 500°F (260°C). Cost-effective.
• PTFE (Polytetrafluoroethylene): Nearly universal chemical resistance, excellent for cryogenic to 500°F (260°C) services. Low friction, non-stick. Used in ultra-pure and highly corrosive services.
• Ceramic Fiber: For extreme high temperatures exceeding 2000°F (1093°C), often in conjunction with high-nickel alloy jackets. Used in furnaces, reformers, and high-temperature processing.
• Mica/Graphite Composites: Used in specific high-temperature, high-pressure applications like head gaskets.

3. Gasket Styles & Profiles

Kaxite Sealing manufactures several standard styles to suit different flange types and pressure classes.

4. Standard Dimensions & Tolerances

Kaxite Sealing gaskets are manufactured to ASME B16.20, API 6A, and customer-specific drawings. Key dimensional parameters include:

• Inside Diameter (ID): Typically matches flange bore. Tight tolerance to prevent flow restriction.
• Outside Diameter (OD): Matches flange OD or gasket contact area. Prevents overhang.
• Thickness: Standard thicknesses are 1/16", 1/8", 3/32", and 1/4". Custom thicknesses available.
• Jacket Thickness: Usually between 0.010" to 0.032" (24 to 20 gauge), depending on size and pressure.
• Surface Finish: Jacket surfaces can be supplied plain, anti-stick coated (e.g., PTFE, silicone), or with sealing serrations.

Kaxite Sealing Metal Jacketed Gaskets: FAQ

Q: When should I choose a metal jacketed gasket over a spiral wound gasket?

A: The choice depends on the application. Metal jacketed gaskets are often superior in applications with high risk of filler erosion or chemical attack, as the jacket fully protects the filler. They are also preferred for heat exchanger channels, small diameters, and where a flat, solid seating surface is needed. Spiral wound gaskets (also a Kaxite Sealing specialty) are better for higher pressure classes (especially with inner rings), wider flange tolerances, and applications requiring more resilience and better sealability on rough surfaces due to their spring-like action.

Q: How do I select the right metal jacket and filler material for my service?

A: Material selection is critical and requires analyzing the full service conditions. You need to consider: 1) Fluid Media: Its chemical composition, pH, and presence of trace corrosive elements (e.g., chlorides, H2S). 2) Temperature: Both continuous operating temperature and any thermal cycling. 3) Pressure: Operating and design pressure. 4) Flange Material & Surface: To avoid galvanic corrosion. Kaxite Sealing's engineering team can assist with this analysis. As a rule, 316SS with flexible graphite is a very robust, widely applicable combination for harsh chemical and high-temperature services up to about 1500°F.

Q: Can metal jacketed gaskets be reused?

A: Generally, metal jacketed gaskets are not designed for reuse. During initial bolting, the soft filler compresses and conforms to the specific imperfections of the flange faces. The metal jacket may also undergo slight deformation. Removing and re-installing a used gasket will not reliably recreate the same sealing geometry, leading to a high probability of leakage. For critical services, Kaxite Sealing always recommends using a new gasket for each assembly.

Q: What are the recommended bolting and installation practices for Kaxite Sealing metal jacketed gaskets?

A: Proper installation is key to performance. Follow these steps: 1) Ensure flange faces are clean, undamaged, and aligned. 2) Inspect the gasket for any damage prior to installation. 3) Do not apply sealants or lubricants to the gasket sealing faces unless specifically recommended (e.g., anti-seize on graphite filler in some cases). 4) Use a calibrated torque wrench and follow a cross-pattern bolting sequence. 5) Torque to the recommended value provided by Kaxite or based on ASME PCC-1 guidelines, considering the flange rating and gasket style. Re-torquing after a short heat cycle is often recommended for high-temperature services.

Q: My application involves severe thermal cycling. Are metal jacketed gaskets suitable?

A: Yes, certain styles are excellent for thermal cycling. The Double Jacketed with Center Ring (Kammprofile) style is specifically designed for this challenge. The solid metal core provides robust dimensional stability, resisting the crushing effect of bolt load and maintaining seal during temperature changes. The soft filler in the grooves accommodates minor flange movement. For extreme cycling, Kaxite Sealing may also recommend specific filler materials like flexible graphite, which has low creep relaxation.

Q: Does Kaxite Sealing offer custom-designed metal jacketed gaskets?

A: Absolutely. While we stock a wide range of standard sizes and styles for common flange standards (ANSI, DIN, JIS), a significant portion of our business is engineering custom sealing solutions. We can manufacture gaskets to any non-standard size, create complex profiles, use specialty metal alloys (Hastelloy, Tantalum, etc.), apply custom coatings, and develop gaskets for proprietary equipment. Our process begins with a detailed review of your P&ID, operating conditions, and flange specifications.

Q: How do I identify a failing metal jacketed gasket, and what are common failure modes?

A: The most obvious sign is external leakage. Upon disassembly, inspect the used gasket. Common failure modes include: 1) Jacket Creep/Over-compression: The metal jacket is visibly crushed or extruded beyond the flange edges, indicating excessive bolt load or a gasket style mismatch for the pressure. 2) Filler Degradation: The soft filler is powdery, washed out, or chemically attacked, which can happen if the jacket was damaged or the filler material was incompatible. 3) Corrosion of Jacket: Pitting, cracking, or thinning of the metal jacket, pointing to incorrect material selection for the media. 4) Blow-Out: A section of the gasket is torn or missing, often due to insufficient bolt load or high internal pressure spikes.