Dinaseal double jacketed gaskets are a specialised solution for ensuring leak-tightness in systems such as heat exchangers, pressure vessels and applications where excessive movement or vibration is experienced due to thermal expansion. These gaskets are designed to withstand extreme conditions, including high operating temperatures (up to 849°F or 454°C) and significant pressures. The following are concepts unique to the design and manufacture of double jacketed gaskets:

1. Design Concept

The double jacketed gasket consists of two fundamental components:

• Outer Metal Shell: Provides the mechanical structure and support for the package.
• Inner Non-Metallic Filler: Usually made of flexible graphite, which offers superior sealing properties and thermal resistance.

The main function of these gaskets is to create a hermetic seal between the contact surfaces between the flanged joints of the heat exchangers, preventing leakage and supporting thermal movements or expansions without losing sealing efficiency.

1. Material Selection

• Metal Shell Materials: The choice of material will depend on the operating conditions, such as temperature, pressure, fluid type and external environmental factors. The most commonly used materials are:

• Carbon steel: Suitable for general pressure and temperature conditions.
• Stainless steel: Models such as 304, 316L, 321, 347 for applications in more corrosive environments.
• Bronze, Copper, Monel: For specific applications requiring high corrosion resistance or aggressive environments.

• Non-Metallic Filler: The standard filler material is flexible graphite, chosen for its excellent sealing properties, thermal resistance and compressibility.

1. Dimensional Specifications

Double jacketed gaskets are manufactured to parameters governed under ASME B16.20 and TEMA standards, which establish clear and detailed guidelines to ensure effective operation.

1. Manufacturing Process

The manufacture of a double jacketed gasket follows a series of rigorous steps to ensure that each component is of the highest quality and meets the customer’s requirements:

1. Cutting and Forming of the Metal Shell: This begins with the selection of suitable sheet metal, which is cut and shaped to the required dimensions. The cutting process may include techniques such as laser or die cutting to ensure accuracy.
2. Preparation of the Non-Metallic Filler: Flexible graphite is cut and shaped for insertion inside the metal jacket. This material is compressed inside the metal jacket in a way that provides a hermetic seal, allowing some flexibility.
3. Circumference Moulding: Using specialised machinery and personnel, the shell is deformed to generate the circular shape, according to the diameter required.
4. Circumference Cutting and Welding: The cutting and welding process that joins the two ends of the shell is carried out, giving the dimensional measurements required.
5. Internal Partition Testing: In the case of multi-figure gaskets, the internal partitions are fabricated and assembled and welded according to the defined distances (C, E, F, G, H). This step is crucial to ensure that the fluid inside the heat exchanger does not leak.
6. Welding and Final Assembly: The welding or assembly of the metal shell with the internal partitions is carried out, ensuring that there are no gaps where the fluid or gas can escape.
7. Finishing: The gaskets are polished and painted according to the parameters established for identification and quality, adapted to the material used, ensuring optimum finishes and a uniform presentation.
8. Quality Inspection: Rigorous quality testing is carried out to ensure that the gasket meets all required specifications, including visual and dimensional inspections, weld testing, as well as validation of finishes and materials.

1. Common Applications and Conditions of Use

Double jacketed gaskets are widely used in industrial applications where heat exchangers are critical to the process. Some of their most common applications include:

• Shell and tube heat exchangers: Where seal integrity is required to be maintained despite thermal expansion and internal pressure.
• Pressure vessels: In the petrochemical and power industry, to prevent leakage in high pressure systems.
• Applications with excessive movement or vibration: Due to the flexibility of the filler and the robustness of the shell, these gaskets can withstand movement caused by thermal expansion without losing their sealing capability.

Rely on Dinaseal technology to maintain the operational efficiency and safety of your equipment at all times. If you have any questions or concerns, please do not hesitate to contact the sales department of Flexilatina de Colombia, who will be ready to provide the best technical advice and support.