High-Performance Double Jacket Gaskets for Bulk OEM and ODM Solutions from Leading Manufacturers
In demanding industrial sealing applications, where extreme pressures, aggressive chemicals, and wide temperature swings are the norm, standard gaskets often fall short. This is where the engineered superiority of Double Jacket Gaskets becomes critical. As a cornerstone of high-integrity sealing solutions, these gaskets are specifically designed to contain the most challenging media in refinery, chemical processing, petrochemical, and high-pressure pipeline services. Kaxite Seals has refined the design and manufacturing of these robust sealing components, leveraging decades of material science and engineering expertise to deliver unmatched reliability and safety.
The fundamental design involves a soft, conformable filler material—typically a resilient graphite or PTFE sheet—encased within a dual-layer metal jacket. This construction combines the sealing prowess of the soft filler with the formidable mechanical strength, blowout resistance, and environmental protection of the metallic jacket. The result is a gasket that can maintain a leak-tight seal under severe bolt load variations, thermal cycling, and system pressures that would compromise other gasket types.
Key Features & Design Advantages
- Exceptional Blowout Resistance: The double-layer metal jacket provides superior containment, preventing the internal filler from being extruded under high internal pressure or fluctuating loads.
- Superior Creep Relaxation Resistance: The metal jacket shoulders a significant portion of the bolt load, minimizing the stress on the soft filler. This dramatically reduces gasket relaxation over time, ensuring a sustained seal throughout maintenance cycles.
- Excellent Thermal & Chemical Performance: By selecting appropriate jacket materials (like 316 Stainless Steel, Monel, or Titanium) and compatible fillers (Grafoil®, PTFE, Ceramic), these gaskets can operate reliably from cryogenic temperatures up to 900°C (1652°F) and resist a vast array of corrosive fluids.
- Enhanced Sealing on Imperfect Flanges: The soft filler compensates for minor flange distortions, scratches, or surface irregularities, ensuring an effective seal even on less-than-ideal flange conditions.
- Wide Pressure & Temperature Range: Capable of performing in services from full vacuum to over 20,000 psi (1380 bar) and across the extreme temperature spectrum.
Detailed Product Specifications & Materials
The performance of a Double Jacket Gasket is directly dictated by the material selection for its jacket and filler. Kaxite Seals offers a comprehensive range of standard and custom combinations to meet specific service requirements.
Standard Metal Jacket Materials
| Material | ASTM Standard | Common Service Temperature Range | Key Corrosion Resistance Properties |
|---|---|---|---|
| 304 Stainless Steel | A240 | -250°C to 800°C | Good general corrosion resistance to oxidising atmospheres, nitric acid, and many organic chemicals. |
| 316/L Stainless Steel | A240 | -250°C to 800°C | Superior to 304 due to Molybdenum content; excellent resistance to sulphates, chlorides, and phosphoric acid. |
| Monel 400 | B127 | -150°C to 600°C | Exceptional resistance to hydrofluoric acid, seawater, sulfuric and hydrochloric acids, and alkalies. |
| Inconel 600 | B168 | -250°C to 1100°C | High resistance to oxidation, carburization, and chloride stress-corrosion cracking. |
| Titanium Gr. 2 | B265 | -250°C to 350°C | Outstanding resistance to chlorides, wet chlorine, oxidising acids, and seawater. |
| Carbon Steel | A516 Gr.70 | -50°C to 500°C | Economical choice for non-corrosive hydrocarbon services, steam, and water. |
Standard Filler Materials
| Filler Material | Max. Continuous Temp. | pH Range | Key Applications & Notes |
|---|---|---|---|
| Flexible Graphite (Grafoil® style) | 450°C (Inert/Reducing) 900°C (Oxidising with inhibitor) | 0-14 (excluding strong oxidisers) | Universal filler for most services. Excellent thermal conductivity, creep resistance, and sealability. Not for strong oxidising acids. |
| PTFE (Polytetrafluoroethylene) | 260°C | 0-14 (Universal) | Near-universal chemical resistance. Ideal for aggressive chemical services, food, and pharmaceutical. Low creep resistance. |
| Ceramic Fiber (High-Temp) | 1260°C | Depends on binder | For extreme high-temperature applications such as furnace doors, exhausts, and incinerators. |
| Compressed Non-Asbestos Fiber (CNAF) | 300°C | 2-12 | General-purpose, cost-effective filler for water, steam, and mild chemical services. |
Standard Dimensions & Pressure Ratings
| Flange Face Type | Standard | Available Sizes (NPS) | Standard Thickness | Typical Pressure Class (ASME B16.5) |
|---|---|---|---|---|
| Raised Face (RF) | ASME B16.20, B16.21 | 1/2" to 60" | 1.5mm, 3.0mm (Filler Dependent) | Class 150 to Class 2500 |
| Ring Type Joint (RTJ) | ASME B16.20 | 1/2" to 60" | Per R, RX, BX Groove Specifications | Class 150 to Class 2500 |
| Flat Face (FF) | ASME B16.21 | 1/2" to 60" | 1.5mm, 3.0mm | Class 125, Class 150 |
| Male-Female (M-F), Tongue & Groove (T-G) | ASME B16.20 | 1/2" to 60" | 1.5mm, 3.0mm | Class 150 to Class 900 |
Frequently Asked Questions (FAQ) About Double Jacket Gaskets
Q: When should I specify a Double Jacket Gasket over a Spiral Wound Gasket?
A: While both are high-performance gaskets, Double Jacket Gaskets are often preferred in services with extremely high pressure, severe thermal cycling, or where the media is highly aggressive and could penetrate or degrade the windings of a spiral wound gasket. The solid metal jacket provides a more complete barrier. They are also excellent for applications with potential for flange rotation or distortion, as the jacket offers greater mechanical strength. For standard high-pressure/temperature refinery services, spiral wound gaskets are common, but for the most severe conditions, engineers often upgrade to a double jacket design from Kaxite Seals.
Q: How do I select the right jacket and filler material combination?
A: Material selection is a three-step process. First, identify the chemical compatibility of both jacket and filler with your process media using corrosion charts—Kaxite Seals engineers can assist with this. Second, ensure both materials can withstand the maximum and minimum continuous operating temperatures of your system. Third, consider pressure: higher pressures may require a higher yield strength jacket material like Inconel. A common, robust combination for refinery services is a 316 Stainless Steel jacket with Flexible Graphite filler. For hot, concentrated sulfuric acid, a Monel jacket with PTFE filler might be specified.
Q: What is the recommended bolt torque or bolt stress for installing Double Jacket Gaskets?
A: Installation torque is critical and varies based on gasket size, pressure class, jacket material, and filler type. It is not a one-size-fits-all value. Kaxite Seals provides detailed, gasket-specific installation guidelines with each order, which include recommended bolt load values (in MPa or psi) based on ASME PCC-1 guidelines. Using a calibrated torque wrench and a proper cross-pattern tightening sequence is essential to achieve even compression and avoid distorting the metal jacket, which could lead to a leak path.
Q: Can Double Jacket Gaskets be reused after disassembly?
A: Generally, no. Double Jacket Gaskets are designed as one-time-use sealing components. During installation, the soft filler compresses and conforms to the flange faces, and the metal jacket deforms slightly to create a custom seal. Upon disassembly, this deformation is permanent. Reusing the gasket will not restore it to its original geometry, and the seal integrity will be compromised, posing a significant risk of leakage. Always replace with a new Kaxite Seals gasket during maintenance.
Q: Do you offer custom shapes and sizes outside the standard flange dimensions?
A: Absolutely. Kaxite Seals specializes in manufacturing custom-engineered sealing solutions. We can produce Double Jacket Gaskets in virtually any size, from small instrument connections to large heat exchanger channels, and in non-standard shapes like oval, square, or rectangular. We work from customer-supplied drawings or CAD models to ensure a perfect fit for unique or proprietary equipment.
Q: How does the performance of a Kaxite Seals Double Jacket Gasket compare to other brands?
A: Kaxite Seals differentiates itself through precision manufacturing and quality control. Our jackets are meticulously formed from seamless, defect-free metal strips with precise overlap joints that are spot-welded for integrity. Our filler materials are sourced from premium-grade mills and are uniformly compressed to exact density specifications. This results in a gasket with consistent thickness, uniform density, and optimal sealing performance across its entire surface. Furthermore, our technical support team provides unparalleled service in material selection and application engineering, ensuring you get the right gasket for the job, every time.
Q: Are these gaskets suitable for offshore or subsea applications?
A: Yes, with the correct material specification. For offshore and subsea environments, resistance to seawater corrosion, high external pressure, and sour service (H2S) is paramount. Kaxite Seals manufactures Double Jacket Gaskets using super duplex stainless steels (e.g., S32750), Inconel 625, or Titanium jackets combined with specialty fillers to meet NACE MR0175/ISO 15156 standards for sour service. The robust construction provides excellent resistance to the hydrostatic pressures and corrosive conditions found in subsea equipment.
Typical Industrial Applications
- Refinery & Petrochemical: Reactor flanges, hydrocracker units, catalytic reformers, high-pressure heat exchangers, and blowdown systems.
- Chemical Processing: Agitated reactors, autoclaves, high-pressure polymerization vessels, and lines carrying corrosive acids/alkalies.
- Oil & Gas Production: Wellhead equipment, Christmas tree assemblies, flow lines, manifold systems, and gas compression stations.
- Power Generation: High-pressure steam lines, turbine casing joints, boiler feedwater systems, and geothermal power plant equipment.
- Pharmaceutical & Food: Sterilizer (autoclave) doors, high-pressure reaction vessels requiring compliance with FDA or USP Class VI standards (using PTFE fillers).
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