4. Fabrication of Shell & Tube Heat Exchangers

  • Define the heat exchanger requirements based on application, fluid properties, temperature, and pressure conditions.
  • Develop detailed engineering drawings and specifications.
  • Choose materials for the tubes, shells, headers, and other components based on the operating conditions and compatibility with the fluids involved.

 

 

  • Cut tubes to the required lengths.
  • Expand or roll the tubes to ensure a tight fit within the tube sheets.
  • Fabricate tube sheets, which are usually made of a material compatible with the tubes.
  • Drill holes in the tube sheet to accommodate the tu
  • Insert the tubes into the tube sheet, ensuring a secure and leak-tight fit.
  • Weld or mechanically bond the tubes to the tube sheet.
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  • Fabricate the shell or casing that will house the tubes.
  • Weld or connect the shell components.
  • Install baffles inside the shell to direct the flow of fluid and enhance heat transfer.
  • Baffle design depends on the specific requirements of the heat exchanger
  • Insert the assembled tube sheet and tube bundle into the shell.
  • Secure the tube bundle in place, ensuring proper alignment.
  • Install headers or manifolds at the ends of the tubes to facilitate fluid inlet and outlet.
  • Weld or connect the headers securely.
  • Perform additional welding to ensure the integrity of the heat exchanger.
  • Inspect welds for quality and perform any necessary finishing processes.
  • Conduct pressure tests to ensure the heat exchanger can withstand the specified operating pressures.
  • Check for leaks and structural integrity.

Apply any required surface treatments, such as painting or coating, for corrosion resistance.

Perform quality control inspections at various stages of production to ensure compliance with design and safety standards.

Generate documentation, including “as-built” drawings, material certifications, and test reports.

Package the heat exchanger for transportation and dispatch.