Double Jacket Gaskets Custom Solutions for Wholesale Suppliers and Manufacturers

What is a Double Jacket Gaskets?

A Double Jacket Gasket is a high-performance sealing solution engineered for the most demanding industrial applications. It is constructed from two concentric metallic jackets, typically made from materials like 304/316 stainless steel, carbon steel, or exotic alloys. These jackets encase and compress a resilient filler material, such as flexible graphite, ceramic fiber, or PTFE. This unique design combines the structural strength and blowout resistance of metal with the excellent conformability and sealing properties of the soft filler. Primarily used in heat exchangers, pressure vessels, reactors, and piping systems, double jacket gaskets are the go-to choice for sealing flanged connections under extreme conditions of high temperature, high pressure, and challenging chemical media.

Key Advantages of Kaxite Double Jacket Gaskets

• Superior Sealing Performance: The dual-metal jacket construction provides exceptional resistance to flange rotation and distortion, maintaining a leak-tight seal even under severe thermal cycling and pressure fluctuations.
• Enhanced Blowout Resistance: The robust outer jackets act as a containment system, preventing the soft filler material from being extruded under extreme internal pressures, a common failure point for standard gaskets.
• Wide Temperature & Pressure Range: Capable of performing reliably from cryogenic temperatures up to 1500°F (815°C) and pressures exceeding 2200 psi (150 bar), depending on material selection.
• Excellent Chemical Compatibility: By selecting appropriate jacket and filler materials (e.g., Hastelloy jackets with PTFE filler), Kaxite gaskets can handle aggressive acids, caustics, and solvents.
• Long Service Life & Reduced Maintenance: Their durability translates to fewer shutdowns for gasket replacement, lowering overall maintenance costs and improving plant safety and efficiency.
• Reusability: In many cases, due to their robust metal construction, Kaxite Double Jacket Gaskets can be reused after careful inspection, unlike non-metallic gaskets.

Detailed Product Specifications & Materials

Kaxite Sealing offers a comprehensive range of Double Jacket Gaskets, customizable to meet exact operational parameters. Below are the standard specifications and available material options.

Standard Construction & Dimensions

• Design: Double concentric metallic jackets (inner and outer) with a soft filler core.
• Standards: Manufactured to ASME B16.20, API 601, and DIN standards. Custom sizes and profiles are available.
• Available Styles: Self-centering, flat face, raised face (RF), and ring-type joint (RTJ) profiles.
• Thickness: Standard thicknesses range from 1/8" (3.2mm) to 1/4" (6.4mm).
• Size Range: From 1/2" NB to 60" NB and above, covering all standard and special flange sizes.

Metallic Jacket Materials

Filler Materials

Frequently Asked Questions (FAQ) About Double Jacket Gaskets

Q: When should I choose a double jacket gasket over a spiral wound or a solid metal gasket?
A: Choose a Double Jacket Gasket when you need a robust seal for applications involving high pressure, high temperature, thermal cycling, or potential flange rotation. They offer superior blowout resistance compared to spiral wound gaskets and better conformability to flange irregularities than solid metal gaskets (like ring-type joints). They are often the preferred choice for heat exchanger channels and covers, reactor manways, and critical pipeline flanges.

Q: How do I select the right material combination (jacket and filler) for my application?
A: Material selection is critical. Follow these steps: 1) Identify the media (chemical composition). 2) Determine the continuous and peak operating temperature and pressure. 3) Consider flange facing type and condition. As a rule, the jacket material must resist external corrosion from the atmosphere/insulation and internal media exposure. The filler must be chemically compatible with the process fluid and stable at the operating temperature. Consulting Kaxite Sealing's engineering team is recommended for critical services.

Q: Are double jacket gaskets reusable?
A: They can be, but with caution. Unlike non-metallic gaskets, the metal jackets often retain their shape. If, upon disassembly, the gasket shows no visible damage—such as deep compression marks, cracks, corrosion, or filler extrusion—it may be carefully reinstalled for the same service. However, for critical, hazardous, or high-pressure services, Kaxite strongly recommends installing a new gasket to ensure optimal sealing integrity and safety.

Q: What is the proper installation torque for a double jacket gasket?
A: There is no single universal torque value. The correct bolt load depends on the gasket thickness, filler material, flange material (ASME class), and bolt size/grade. Always follow the equipment manufacturer's specifications or refer to ASME PCC-1 guidelines for bolted joint assembly. Using a calibrated torque wrench and a proper cross-pattern tightening sequence is essential to achieve uniform compression and avoid gasket distortion or flange damage.

Q: Can Kaxite provide double jacket gaskets for non-standard or large diameters?
A: Absolutely. Custom fabrication is a core strength of Kaxite Sealing. We routinely manufacture gaskets in diameters exceeding 60 inches and for unique flange profiles not covered by standard catalogs. Our engineering team can work from your drawings, CAD files, or even physical samples to produce a gasket that meets your exact dimensional and performance requirements.

Q: How do double jacket gaskets perform in fire-safe scenarios?
A: Kaxite Double Jacket Gaskets, particularly those constructed with stainless steel jackets and flexible graphite or mica-graphite filler, are inherently fire-safe. In a fire, the graphite filler does not burn but may oxidize slowly if directly exposed to flame, while the metal jackets maintain a mechanical barrier, helping to prevent catastrophic blowout. For certified fire-safe applications, ensure the specific gasket construction complies with standards like API 607 or API 6FB.