What are the types of jackets on Stainless Steel vessels?

Stainless Tanks, Vessels, Pan, Kettles can come with the capacity to control the temperature of the product using different types of mediums or as we call it, a jacket, here are the most common:

Conventional Jacket:

A secondary shell typically fabricated with an annular space from the primary vessel to let the heating/cooling medium flow through

Advantages:

• These jacketed vessels can accommodate heavier corrosion allowances.
• Cut-outs can be located to accommodate nozzles passing through the jacket.?
• More budget friendly than other types unless it’s high pressure

Disadvantages:

• The external pressure on the inner vessel due to jacket pressure can require a heavy internal vessel wall.
• In most cases it can’t accommodate high pressure mediums like steam.

?Dimple Jacketed Pressure Vessels:

Sheet type material welded directly to the vessel on 1.5” to 2” centers.?

Advantages:

• Cut-outs for nozzles can be easily located to allow nozzles passing through jacket to inner vessel.
• Better heat transfer than clamp on style.
• Does not require an increase in shell thickness due to jacket pressure.?

Disadvantages:

• Thin wall material is not acceptable for heavier corrosion allowances.
• Fabrication is labor intensive.
• Difficult to repair.

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Half Pipe Coil Jacket:

Split pipe or extruded half pipe shapes welded to shell or head.?

Advantages:

• It offers the most consistent heat transfer throughout the wall the vessel
• Suitable for high pressures on jacket side and for improved heat transfer.?

Disadvantages:

• Can be difficult to route around supports and openings that pass through the jacket area into the primary vessel.

Internal Pipe Coils:

Typically, 2” or 3” NPS internal pipe coils.?

Advantages:

• Cost effective
• More efficient heat transfer.
• Easy to submerge if tank is open top

Disadvantages:

• Hard to maintain/install in closed top tank
• More wetted material causing for more product loss
• Hard to CIP inside Vessels

Bayonet or Bundle Type Insert Heaters:

Pipe or tube bundle type heater inserted through a flanged opening.?

Advantages:

• Easy to replace.
• Easy to control
• Effective in long term temperature stability

Disadvantages:

• Power consumption is usually high
• Not most effective
• Downtime to raise temperature