Quality Double Jacket Gaskets from Reliable Wholesale Suppliers in China
What are Double Jacket Gaskets?
In demanding industrial applications where sealing integrity is non-negotiable, the Double Jacket Gaskets stands as a pinnacle of reliability and performance. Also known as double-jacketed gaskets, these are sophisticated sealing components engineered for extreme environments characterized by high pressure, high temperature, corrosive media, and significant thermal cycling. Unlike simple filler-based gaskets, a Double Jacket Gaskets features a durable metal outer shell—typically stainless steel, carbon steel, or exotic alloys—that encases and compresses a precisely cut filler material, such as flexible graphite, PTFE, or ceramic fiber. This double-walled construction provides superior containment, prevents filler blow-out, and offers exceptional resilience against system fluctuations. For professionals in oil & gas, chemical processing, power generation, and pharmaceutical sectors, specifying the correct Double Jacket Gaskets is a critical decision impacting safety, efficiency, and operational costs. The Kaxite brand has built its reputation on delivering gaskets that meet and exceed these rigorous demands through advanced engineering and stringent quality control.
Core Advantages of Kaxite Double Jacket Gaskets
Choosing Kaxite Double Jacket Gaskets provides a measurable return on investment through enhanced performance and longevity. Here are the key benefits that set our product apart:
- Unmatched Sealing Performance: The metal jacket provides a robust barrier, creating an initial seal on the flange face. The soft, compliant filler material then conforms to micro-imperfections, ensuring a leak-tight seal even under low bolt loads. This dual-action sealing is highly effective for challenging services.
- Exceptional Blow-Out Resistance: The outer metal jacket fully confines the filler material, preventing its extrusion or erosion under extreme cyclic pressure, vacuum, or temperature conditions. This design is crucial for preventing catastrophic seal failure in volatile systems.
- Superior Thermal & Chemical Stability: Kaxite gaskets are engineered with material combinations that withstand thermal shock and resist a vast array of corrosive chemicals, acids, and solvents. They maintain seal integrity across a wide temperature range.
- High Pressure & Temperature Capability: The inherent strength of the metal jacket allows these gaskets to perform reliably in ASME B16.5 Class 900 and higher pressure classes, and at temperatures exceeding those suitable for standard spiral wound gaskets.
- Re-sealing Capability: Unlike many gasket types that permanently deform, the resilient filler within a Kaxite double jacket gasket can often accommodate minor flange movements or re-torquing procedures, allowing for re-sealing without immediate replacement.
- Long Service Life & Reduced Maintenance: The durable construction resists creep relaxation and degradation, leading to longer gasket life, reduced downtime for replacements, and lower total cost of ownership.
Technical Specifications & Material Selection Guide
To ensure optimal performance, Kaxite Double Jacket Gaskets are available in a comprehensive range of specifications. Proper selection hinges on understanding your specific service conditions. Below are the detailed parameters and material options.
Standard Construction & Dimensions
- Conforms To: ASME B16.20, API 6A, DIN, and other international standards.
- Standard Sizes: From ½" NB to 48" NB and larger, custom sizes available.
- Pressure Ratings: Suitable for Class 150 through Class 2500 and beyond.
- Jacket Thickness: Typically 0.008" to 0.020" (0.2mm to 0.5mm), depending on material and application.
- Filler Thickness: Varies based on jacket type; standard fill depths ensure optimal compression.
Metal Jacket Material Options
The jacket material is selected for corrosion resistance, temperature capability, and strength.
| Material Grade | Common Designation | Max Temp (°C/°F) | Key Properties & Typical Applications |
|---|---|---|---|
| 304 Stainless Steel | AISI 304, SS304 | 750°C / 1382°F | Excellent general corrosion resistance. Ideal for steam, water, mild chemicals, and food processing. |
| 316/316L Stainless Steel | AISI 316/L, SS316 | 800°C / 1472°F | Superior pitting & chloride resistance. Standard for chemical, petrochemical, and marine environments. |
| 321 Stainless Steel | AISI 321, SS321 | 815°C / 1499°F | Stabilized with titanium for improved intergranular corrosion resistance in high-temp service. |
| Carbon Steel | AISI 1020/1035 | 540°C / 1004°F | High strength, cost-effective for non-corrosive, high-pressure services like steam and oil. |
| Alloy 20 | UNS N08020 | 540°C / 1004°F | Outstanding resistance to sulfuric acid and other aggressive chemicals. |
| Monel | UNS N04400 | 540°C / 1004°F | Excellent resistance to seawater, hydrofluoric acid, and alkaline solutions. |
| Inconel 600/625 | UNS N06600 / N06625 | 1095°C / 2003°F | Exceptional oxidation resistance and strength at very high temperatures (furnaces, heat treatment). |
Filler Material Options
The filler provides the conformable sealing element. Kaxite offers high-purity, certified filler materials.
| Filler Material | Temperature Range | pH Range | Key Characteristics & Applications |
|---|---|---|---|
| Flexible Graphite (GRAFOIL®-type) | -240°C to 3000°C* (-400°F to 5432°F*)*Inert/Reducing atmospheres |
0-14 (except strong oxidizers) | Superior thermal conductivity, excellent chemical resistance (excluding strong oxidizers), highly compressible. The default choice for most high-temperature services. |
| PTFE (Virgin or filled) | -260°C to 260°C (-436°F to 500°F) |
0-14 (Universal) | Nearly universal chemical resistance, low friction, FDA compliant. Ideal for corrosive chemical services and ultra-clean applications. |
| Ceramic Fiber (High-Temp) | Up to 1260°C (2300°F) | 2-12 | For extreme high-temperature applications in oxidizing atmospheres where graphite is unsuitable (e.g., furnace flanges, incinerators). |
| Mica/Graphite Composite | Up to 870°C (1600°F) | 0-14 | Provides excellent fire-safe performance and is often used in heat exchanger applications. |
Standard & Optional Features
- Inner/Outer Rings: Standard with an outer centering ring for easy alignment. Inner rings (I-Rings) are optional to prevent filler erosion in high-velocity flow or to provide buckling control.
- Coatings: Anti-stick coatings (e.g., PTFE, DLC) can be applied to facilitate gasket removal and prevent adhesion to flange faces.
- Identification Tags: Laser-etched tags for full traceability (Material, Heat No., Size, Pressure Class).
Frequently Asked Questions (FAQ) About Double Jacket Gaskets
Q: When should I choose a Double Jacket Gasket over a Spiral Wound Gasket?
A: The choice depends on service conditions. Double Jacket Gaskets are generally preferred for applications with higher risk of filler extrusion, more severe thermal cycling, or where a more robust, containment-focused design is needed. They often outperform spiral wound gaskets in high-pressure steam, hot oil, and certain corrosive chemical services where cyclic conditions are present. Spiral wound gaskets offer more flexibility and are excellent for a wide range of services, but the double jacket design provides superior blow-out resistance. A Kaxite engineer can help you make the correct selection based on your specific P/T ratings and media.
Q: How do I determine the correct material combination (Jacket & Filler) for my application?
A: Material selection is a three-step process. First, identify the chemical compatibility of both jacket and filler with your process media using chemical resistance charts—PTFE filler is best for broad chemical resistance, graphite for high heat. Second, consider the maximum continuous and cyclic temperature—this often dictates the jacket material (e.g., 304/316 SS for most services, Inconel for extreme heat). Third, factor in pressure and potential for thermal shock. Kaxite provides detailed selection guides and offers complimentary engineering support to verify your material choice for safety and longevity.
Q: What are the proper installation and torque procedures for a Double Jacket Gasket?
A: Correct installation is critical. Always start with clean, undamaged, and aligned flange faces. Never reuse a Double Jacket Gasket. Place the gasket centered on the flange. Use a cross-bolting pattern (star pattern) to tighten bolts gradually and evenly in multiple passes (typically 30%, 60%, 100% of final torque). Use the recommended bolt torque values specified by ASME PCC-1 or the flange manufacturer, adjusted for your bolt lubrication. The goal is to achieve a uniform compressive load across the gasket face. Under-torquing can cause leaks; over-torquing can crush the filler and damage the jacket, compromising the seal.
Q: Can Kaxite Double Jacket Gaskets be used in heat exchanger applications?
A: Yes, they are an excellent choice for many heat exchanger applications, particularly for channel, shell, and floating head flanges. The key is selecting the right filler. For high-temperature thermal oil or steam services, flexible graphite filler is standard. For applications involving severe thermal cycling, the double jacket design helps contain the filler and maintain seal integrity. Optional inner rings are highly recommended for heat exchangers to prevent filler erosion from high-velocity cross-flow. Kaxite provides gaskets to TEMA dimensions and standards.
Q: Are these gaskets suitable for sour service (H2S) environments as per NACE MR0175/ISO 15156?
A: Yes, Kaxite can manufacture Double Jacket Gaskets compliant with NACE MR0175/ISO 15156 for sour service. This requires strict control over the hardness and composition of the metal jacket materials (typically specified with a maximum hardness of 22 HRC for carbon/low-alloy steels). We use certified sour-service grade materials and processes, and provide full material certification (MTC) documenting compliance for your records and safety audits.
Q: Do you offer custom shapes and sizes outside the standard ASME B16.20 range?
A: Absolutely. While we stock a wide range of standard sizes, a significant portion of our work involves custom-engineered solutions. We can manufacture Double Jacket Gaskets in oval, rectangular, obround, and other irregular shapes to fit heat exchangers, reactors, and proprietary equipment. We work from your supplied drawings or CAD files, ensuring precise dimensions and the correct selection of materials for your unique application. Our engineering team reviews all custom orders to validate design suitability.
Industries & Critical Applications
Kaxite Double Jacket Gaskets are specified by engineers and maintenance professionals across a spectrum of industries where failure is not an option. Their reliability makes them indispensable in the following applications:
- Oil & Gas Refining & Petrochemical: High-pressure and high-temperature reactor flanges, crude/vacuum unit exchangers, reformer and coker unit flanges, sour gas pipelines (NACE compliant).
- Chemical & Pharmaceutical Processing: Agitated reactors, distillation columns, autoclaves, and critical piping carrying aggressive acids, solvents, and high-purity intermediates.
- Power Generation (Fossil, Nuclear, Waste-to-Energy): Main steam lines, turbine flanges, boiler feed pump systems, and flue gas ducting where temperatures and pressures are extreme.
- Pulp & Paper: Digester and bleach plant equipment handling corrosive liquors and high temperatures.
- Marine & Offshore: Seawater cooling systems, engine exhausts, and critical piping on FPSOs and platforms where reliability is paramount.
- Heating & Thermal Fluid Systems: Hot oil systems, heat transfer fluid (HTF) circuits, and thermal oxidizers.
- View as
Stamped Jacket Gasket
Kaxite Sealing's Stamping Jacket Gasket offers superior sealing performance for industrial applications, crafted from durable materials to prevent leaks and ensure long-lasting reliability. Its innovative design provides an easy installation and enhanced protection, making it ideal for machinery professionals seeking efficiency and peace of mind. Experience unmatched durability and precision with this standout solution that addresses common sealing challenges effectively.
Double-Jacketed Gasket
Kaxite Sealing's Double-Jacketed Gasket offers superior sealing performance for industrial applications, combining durable materials and innovative design to prevent leaks under extreme conditions. Ideal for engineers and manufacturers, it enhances safety and efficiency, delivering lasting reliability and peace of mind. With its unique dual-layer construction, it outperforms standard options for critical environments. Rely on Kaxite for trusted sealing solutions.
