Double Jacket Gaskets

What Are Double Jacket Gaskets?

Double jacket gaskets are specialized sealing components designed for high-pressure and high-temperature applications, commonly used in industries such as oil and gas, chemical processing, and power generation. These gaskets feature a unique construction with two metal jackets enclosing a soft filler material, providing enhanced sealing performance, durability, and resistance to extreme conditions. The double layer design ensures superior leak prevention and longevity compared to standard gaskets.

Key Features of Double Jacket Gaskets

• Dual metal jackets for increased strength and corrosion resistance.
• Soft filler material (e.g., graphite or PTFE) for excellent compressibility and seal integrity.
• Suitable for temperatures up to 1000°F (538°C) and pressures exceeding 2500 psi.
• Available in various sizes and custom shapes to fit specific flange configurations.
• Compliant with industry standards such as ASME B16.20 and API 6A.

Technical Specifications

Applications of Double Jacket Gaskets

Double jacket gaskets are ideal for critical sealing applications where reliability is paramount. They are commonly used in:

• Pipeline flanges in oil and gas transmission systems.
• Heat exchangers and boilers in power plants.
• Chemical reactors and pressure vessels.
• High-pressure valves and pumps.

Advantages Over Other Gasket Types

Compared to single jacket or spiral wound gaskets, double jacket gaskets offer:

• Better resilience under thermal cycling and pressure fluctuations.
• Reduced risk of leakage due to the dual-layer protection.
• Longer service life, reducing maintenance costs and downtime.
• Enhanced performance in corrosive environments.

Frequently Asked Questions (FAQ)

What materials are used in double jacket gaskets?
Double jacket gaskets typically consist of outer jackets made from metals like stainless steel or carbon steel, and a soft filler material such as graphite, PTFE, or ceramic fiber, chosen based on application requirements.

How do I select the right double jacket gasket for my application?
Consider factors like operating temperature, pressure, medium (e.g., corrosive fluids), flange type, and size. Consult industry standards (e.g., ASME B16.20) and possibly seek expert advice to ensure compatibility and performance.

Can double jacket gaskets be used in low-temperature applications?
Yes, they can operate effectively in temperatures as low as -100°F (-73°C), provided the materials are selected appropriately, such as using low-temperature resistant fillers and jackets.

Are these gaskets reusable?
Generally, double jacket gaskets are not designed for reuse due to potential deformation and compression set after initial installation. It is recommended to replace them during maintenance to ensure optimal sealing.

What maintenance is required for double jacket gaskets?
Regular inspection for signs of wear, corrosion, or leakage is advised. Ensure proper installation torque and flange alignment to prevent issues. Replacement should follow the manufacturer's guidelines or based on operational conditions.

How do double jacket gaskets compare to spiral wound gaskets?
Double jacket gaskets offer better performance in high-pressure and high-temperature scenarios due to their robust construction, whereas spiral wound gaskets are more flexible but may not provide the same level of durability under extreme conditions.