Temperature control is essential in many industrial processes. In industries like chemical processing, oil and gas, pharmaceuticals, and food production, even small temperature changes can affect product quality, reaction rates, or process safety.
To maintain stable operating conditions, many manufacturers use jacketed stainless steel tanks. Tank jackets allow heating or cooling fluids to circulate around the vessel, helping operators precisely control the temperature of the process inside.
Keep in mind that different jacket styles provide different levels of pressure resistance, heat transfer performance, and structural support. Choosing the right configuration ensures the vessel performs efficiently under the conditions required by your process.
Pressure vessel jacketing is a thermal management solution that surrounds a tank with a channel or passageway for circulating heating or cooling media. These fluids—such as steam, water, glycol, or thermal oil—flow through the jacket to transfer heat to or from the vessel’s contents.
The basic principle behind tank jacketing is heat transfer. As the heating or cooling fluid moves across the outside surface of the vessel, thermal energy is either added to or removed from the process fluid inside the tank.
Depending on the application, the goal may include:
A properly engineered jacketing system provides uniform temperature distribution across the vessel, preventing hot spots or cold zones that could negatively impact the process.
Tank jacketing can also improve energy efficiency by providing controlled heating and cooling exactly where it is needed, rather than relying on external heating systems or environmental temperature control.
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The three most common jackets are:
1. Conventional tank jacketing
2. Dimple tank jacketing
3. Half-pipe coil jacketing
Conventional jacketing is one of the simplest designs used for temperature-controlled vessels. This configuration adds a second stainless steel layer around the tank, creating a cavity between the vessel wall and the outer jacket.
Heating or cooling fluid flows through this cavity to transfer heat across the tank surface.
Internal baffles are often welded inside the jacket space to guide the fluid and distribute it evenly around the vessel. This helps maintain consistent temperature control across the tank wall.
Conventional jackets are typically best suited for:
As vessel size and operating pressure increase, the outer jacket must become thicker to handle the added stress. This can make conventional jacketing more expensive for larger tanks.
Dimple jackets provide a lighter and often more cost-effective alternative to conventional jacketing.
In this design, a thin stainless steel sheet is attached to the vessel using a pattern of spot or plug welds. When the jacket is pressurized during fabrication, the weld pattern forms raised dimples that create channels for fluid flow.
Heating or cooling media moves through these channels, transferring heat across the tank surface.
Dimple jackets offer several advantages:
However, dimple jackets are not ideal for processes that involve frequent or rapid temperature cycling. Large temperature swings can place stress on the weld points over time, which may eventually lead to fatigue.
For this reason, dimple jackets are commonly used in applications where temperatures change gradually.
Half-pipe coil jackets are designed for applications that require higher pressure capabilities and greater structural strength.
Instead of enclosing the vessel in an outer shell, this design uses pipe that has been split in half and welded directly to the tank wall. The pipe is wrapped around the vessel in a spiral pattern, forming a coil through which heating or cooling fluids flow.
As the fluid moves through the coil, heat transfers through the vessel wall to control the temperature of the contents inside.
Half-pipe jackets are particularly effective for:
Because the coil is welded directly to the tank shell, this configuration can handle higher stresses and provides reliable performance in demanding environments.
Selecting the right jacket style depends on the specific requirements of the process. Factors such as pressure, temperature range, vessel size, and heating or cooling speed all influence which configuration works best.
In general:
Working with a manufacturer experienced in stainless steel vessels ensures the jacket design matches the needs of your process.
If you're planning a custom vessel, the right jacketing configuration can make a significant difference in process performance and efficiency.
Use our Tank Designer to configure your stainless steel tank and receive an instant quote based on your specifications.