Dinaseal double jacket gaskets are a specialized solution to ensure 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. Below are detailed concepts for the design and manufacturing of double jacket type packaging:
- Design Concept
Double jacket packaging consists of two fundamental components:
- External Metal Shell: Provides the mechanical structure and support to the packaging.
- Internal 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 leaks and supporting movements or thermal expansions without losing sealing efficiency.
- Selection of Materials
- Materials for the Metal Shell: The choice of material will depend on the operating conditions, such as temperature, pressure, type of fluid and external environmental factors. The most 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 that require high resistance to corrosion or aggressive environments.
- Non-Metallic Filler: The standard material for filler is flexible graphite, chosen for its excellent sealing properties, thermal resistance and compression capacity.
- Dimensional Specifications
Double jacket packaging is manufactured according to parameters governed by ASME B16.20 and TEMA standards, which establish clear and detailed guidelines to ensure its effective operation.
- Manufacturing Process
The manufacturing of double jacket packaging follows a series of rigorous steps to ensure that each component is of the highest quality and meets customer requirements:
- Cutting and Forming of the Metal Shell: It begins with the selection of the appropriate metal sheet, which is cut and shaped according to the required dimensions. The cutting process may include techniques such as laser or die cutting to ensure precision.
- Preparation of the Non-Metallic Filler: The flexible graphite is cut and molded to be inserted inside the metallic shell. This material is compressed within the metal jacket so that it provides an airtight seal, allowing some flexibility.
- Circumference Molding: Using machinery and specialized personnel, the shell is deformed to generate the circular figure, according to the diameter required.
- Circumference Cutting and Welding: The cutting and welding process is carried out that joins the two ends of the shell, giving the dimensional measurements specific to the request.
- Internal Partition Test: In the case of multi-figure packaging, internal partitions are manufactured and assembled, which are 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.
- Welding and Final Assembly: Welding or assembly of the metal shell with the internal partitions is carried out, ensuring that there are no spaces through which the fluid or gas can escape.
- Finishes: The packages are polished and painted according to the parameters established for identification and quality, adapted to the material used, ensuring optimal finishes and a uniform presentation.
- Quality Inspection: Rigorous quality tests are carried out to ensure that the packaging meets all required specifications, including visual and dimensional inspections, welding tests, as well as validation of finishes and materials.
- Common Applications and Conditions of Use
Double jacket packaging is widely used in industrial applications where heat exchangers are critical to the process. Some of its most common applications include:
- Shell and tube heat exchangers: Where it is required to maintain seal integrity despite thermal expansion and internal pressure.
- Pressure vessels: In the petrochemical and energy industry, to prevent leaks in high pressure systems.
- Applications with excessive movements or vibrations: Due to the flexibility of the filling and the robustness of the shell, these gaskets withstand movements caused by thermal expansion without losing their sealing capacity.
Trust Dinaseal technology to maintain the operational efficiency and safety of your equipment at all times. If you have any questions or concerns, do not hesitate to contact the commercial department of Flexilatina de Colombia, who will be ready to provide the best technical advice and support.