Marine Shell and Tube Heat Exchanger | Durable & Adaptable Design

A marine shell and tube heat exchanger is a standard heat exchange device used in shipboard auxiliary systems. It is also known as a tubular heat exchanger.
The structure is simple, strong, and adaptable. It consists of a shell, tube bundle, tube sheets, baffles, and end covers. The tube bundle is fixed to the tube sheets and enclosed by the shell and covers, creating two independent spaces.
The fluid flowing inside the tubes is called the tube-side medium. The fluid flowing outside the tube bundle and inside the shell is called the shell-side medium. Heat passes through the tube walls, while the two fluids remain separated.
In marine applications, shell and tube heat exchangers are used for cooling, heating, condensation, and heat recovery. They are suitable for harsh engine room environments where reliability, maintainability, and material selection are important.

Technical Specifications：

Note: The final design depends on heat duty, medium type, working pressure, working temperature, flow rate, installation space, and material requirements.

Key Features：

• Robust Structure for Marine Conditions: Marine systems often operate under vibration, temperature changes, pressure changes, and continuous-duty conditions. A shell and tube heat exchanger has a strong mechanical structure, making it suitable for ship engine rooms and marine auxiliary equipment.
• Suitable for Different Marine Media: The heat exchanger can handle many shipboard media, including lube oil, fuel oil, fresh water, seawater, steam, and condensate. It can be used as a cooler, heater, condenser, or heat recovery unit according to the vessel system.
• Easy Cleaning and Maintenance: The structure is practical for marine maintenance. The end cover can be opened for inspection, and the tube bundle can be cleaned when scaling, fouling, or deposits reduce heat transfer efficiency.
• Efficient Heat Transfer: The tube bundle provides the main heat transfer surface. Baffles guide the shell-side fluid across the tube bundle, increasing turbulence and improving heat exchange performance.
• Flexible Material Options: Different materials can be selected according to the medium and working environment. Copper-nickel alloy and titanium are commonly considered for seawater service, while stainless steel, carbon steel, and copper can be selected for other marine applications.
• Custom Design for Shipboard Systems: Raygo Marine can support customized designs based on heat exchange area, medium type, installation space, flow arrangement, nozzle position, pressure rating, temperature rating, and customer drawings.

Working Principle：

A marine shell and tube heat exchanger works by transferring heat between two fluids through the walls of the heat exchange tubes.

• Tube Side
  One fluid flows inside the heat exchange tubes. This side is called the tube side. Depending on the application, the tube-side medium can be oil, water, steam, condensate, or another shipboard fluid.
• Shell Side
  The second fluid flows inside the shell and around the outside surface of the tube bundle. This side is called the shell side.
• Heat Transfer Through Tube Walls
  The two fluids do not mix. Heat transfers through the tube walls. A hotter medium releases heat, while a cooler medium absorbs heat.
• Baffles for Better Heat Exchange
  Baffles are installed inside the shell. They force the shell-side fluid to flow across the tube bundle instead of moving directly along the shell. This increases turbulence, improves contact with the tube surface, and helps raise the heat transfer rate.
• Multi-Pass Flow Design
  The end cover can include internal partition plates. These plates divide the tube side into multiple passes, allowing the fluid to stay inside the exchanger longer and improving heat exchange efficiency.

Main Components：

Available Options：

Material selection is important for marine heat exchangers because different media have different corrosion, temperature, and pressure requirements.

For seawater service, corrosion resistance should be considered carefully. For oil and steam systems, temperature, pressure, and cleanliness requirements should also be checked before material selection.

Applications：

Marine shell and tube heat exchangers are used in many vessel systems. They can serve as coolers, heaters, condensers, and heat recovery units.

Installation & Maintenance：

Correct installation and operation help improve heat exchange performance and extend service life.

Recommended installation and operation points:

• Confirm inlet and outlet direction before installation.
• Follow the designed tube-side and shell-side flow arrangement.
• Make sure flange connections and sealing surfaces are properly aligned.
• Install pressure gauges, thermometers, and safety valves according to system requirements.
• Keep enough maintenance space for end cover removal and tube bundle cleaning.
• Make sure operating pressure and temperature stay within the design range.
• Check whether the selected material is suitable for the medium, especially for seawater service.
• Clean the system before operation to reduce blockage and fouling risks.
• Monitor pressure and temperature during operation.
• Stop operation and inspect the exchanger if abnormal pressure, leakage, or sharp performance drop occurs.

Regular maintenance helps keep stable heat transfer performance and reduce failure risk. Tube bundle fouling, corrosion, gasket aging, and loose fasteners are common issues in long-term operation.

Maintenance Recommendations:

• Inspect the tube bundle regularly.
• Clean scaling and deposits before they reduce heat transfer efficiency.
• Check flange gaskets and fastening bolts.
• Inspect tube sheet areas for leakage, corrosion, or vibration wear.
• Check pressure gauges, thermometers, and safety valves during operation.
• Use suitable cleaning methods according to tube material and fouling type.