In demanding industrial sealing applications where standard gaskets fail, Double Jacket Gaskets provide a robust and reliable solution. Engineered for superior performance in high-pressure and high-temperature environments, these gaskets feature a unique construction that combines metallic strength with sealing resilience. At Kaxite Sealing, we specialize in the design and manufacture of premium double jacket gaskets that meet the rigorous standards of the oil and gas, chemical processing, power generation, and petrochemical industries.
The core principle behind a double jacket gasket is its composite structure. It consists of a soft, compressible filler material—typically non-asbestos sheets like graphite, PTFE, or ceramic fiber—encased within two layers of formed metal jacket. This metal jacket, often made from stainless steel, carbon steel, or exotic alloys like Monel or Inconel, provides structural integrity and contains the filler material under extreme conditions. This design ensures excellent seating stress distribution, prevents blowouts, and offers exceptional resistance to creep relaxation, making them ideal for heat exchangers, pressure vessels, and flanged connections in critical service.
Kaxite Sealing's double jacket gaskets are not just components; they are engineered sealing systems. Our commitment to precision and quality translates into distinct advantages for your operations.
Kaxite Sealing offers a comprehensive range of double jacket gaskets. The specifications are critical for ensuring proper selection and performance. Below are the detailed parameters we engineer to.
| Component | Material Options | Key Properties & Typical Applications |
|---|---|---|
| Metal Jacket | 304/316 Stainless Steel, Carbon Steel, Monel 400, Inconel 600/625, Hastelloy C276, Titanium, Copper | Provides strength and corrosion resistance. SS316 is common for general corrosion; exotic alloys are for severe chloride or acid services. |
| Filler Material | Flexible Graphite (Grafoil), PTFE, Ceramic Fiber, Mica, Non-Asbestos Compressed Fiber | Provides the primary seal. Graphite offers wide temp range and chemical inertness. PTFE is for aggressive chemicals at lower temps. |
| Jacket Thickness | 0.012" (0.3mm), 0.016" (0.4mm), 0.020" (0.5mm), 0.025" (0.63mm) | Thicker jackets offer higher pressure ratings and durability but require higher bolt load for proper seating. |
| Nominal Pipe Size (NPS) | Inside Diameter (ID) Range | Outside Diameter (OD) Range | Standard Pressure Class (ANSI/ASME) | Max Temp Range (with Graphite Filler) |
|---|---|---|---|---|
| 1/2" to 24" | 0.84" to 24.50" | 1.88" to 27.25" | 150, 300, 600, 900, 1500, 2500 | -240°F to +900°F (-150°C to +482°C) |
| 24" and larger (Custom) | Per customer flange drawing | Per customer flange drawing | Custom designs for special applications | Dependent on material combination |
| Parameter | Test Standard | Typical Value (SS316 Jacket / Graphite Filler) |
|---|---|---|
| Recommended Seating Stress | ASME PCC-1 | 20,000 - 30,000 psi |
| Blowout Pressure Resistance | API 6A / ASME B16.20 | > 1.5 x Rated Pressure Class |
| Leak Rate (Helium) | ASME B16.34 / ISO 15848 | < 1 x 10-6 mg/s·m |
| Compression-Recovery (%) | ASTM F36 | 15-25% compression with >85% recovery |
| Chemical Compatibility | N/A | Excellent with most acids, solvents, steam, and hydrocarbons. Specific charts available. |
Q: When should I choose a double jacket gasket over a spiral wound gasket or a kammprofile gasket?
A: The choice depends on service conditions. Double jacket gaskets are often preferred for applications with extreme pressure, high temperature cycling, or where blowout of filler material is a primary concern. They generally have a higher seating stress requirement but offer excellent creep resistance. Spiral wound gaskets are excellent for a wide range of pressures and temperatures and are more forgiving to flange surface imperfections. Kammprofile gaskets are ideal for heat exchanger applications and situations requiring high resilience and excellent performance under thermal cycling. A Kaxite Sealing engineer can help you select the optimal type based on your specific P/T, media, and flange conditions.
Q: How do I properly install and torque a double jacket gasket?
A: Correct installation is crucial. First, ensure flanges are clean, undamaged, and aligned. Place the gasket centered on the flange face. Use lubricated bolts and follow a star-pattern tightening sequence (cross-bolting) in multiple passes. The final pass should achieve the target bolt stress as calculated per ASME PCC-1 guidelines, typically corresponding to 20,000-30,000 psi gasket seating stress. Under-torquing can lead to leakage; over-torquing can crush the filler or damage the metal jacket. Always refer to the specific installation guide provided by Kaxite Sealing with your gasket.
Q: Can Kaxite Sealing provide double jacket gaskets for non-standard or special flange dimensions?
A: Absolutely. Customization is a core strength at Kaxite Sealing. We routinely manufacture double jacket gaskets for proprietary flanges, heat exchanger channels, and vessels with unusual dimensions. Simply provide us with an accurate flange sketch, CAD drawing, or a sample of the old gasket. We can engineer the gasket with custom IDs, ODs, thicknesses, and material combinations to fit your exact application.
Q: What is the lead time for standard and custom double jacket gaskets?
A: For standard sizes and material combinations from our extensive inventory, lead times can be as short as 1-3 business days. For custom-engineered gaskets, including those requiring special tooling or exotic alloys, the typical lead time ranges from 2 to 5 weeks depending on complexity and order quantity. We offer expedited services for urgent requirements—contact our sales team for specific timing.
Q: Are there any media or chemicals that double jacket gaskets are not suitable for?
A: While highly versatile, material compatibility is paramount. Standard graphite-filled gaskets are not recommended for strongly oxidizing acids (e.g., nitric, sulfuric at high concentrations) at elevated temperatures, as they can oxidize. PTFE filler has limitations with certain solvents and at high temperatures. For applications involving molten alkali metals, pure oxygen service, or other exotic media, a thorough review is necessary. Kaxite Sealing provides detailed chemical compatibility guides and engineering support to ensure the selected materials are appropriate for your process fluid.
Q: How does Kaxite Sealing ensure the quality of its double jacket gaskets?
A: Every Kaxite Sealing double jacket gasket is manufactured under a strict quality management system. We perform dimensional inspections on all critical parameters (ID, OD, thickness) using calibrated instruments. Material certifications (MTC) are available for all metal and filler materials. For critical service applications, we can provide additional testing, such as helium leak tests or PMI (Positive Material Identification), to verify alloy composition. Our commitment is to deliver gaskets that meet or exceed the requirements of ASME B16.20, API 6A, and other relevant international standards.
