Pipe Expansion Joint Insulation Jackets

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Removable Insulation Jackets for Pipe Expansion Joints

Pipe Expansion Joints, also known as compensators, are commonly overlooked piping system components through which much heat can be lost. Insulation jackets can help.

Expansion Joint



Pipe Expansion Joint with Insulation Jacket


About Pipe Expansion Joints
Pipe expansion joints serve a vital function in many high temperature piping systems. If you follow the piping system in a building long enough, once you get past the copious amount of gate valves, globe valves, wye strainers, tee’s, elbows and other components, you will run into an expansion joint. Expansion joints are necessary in systems that convey high temperature substances such as steam , or to absorb movement and vibration. A joint is made of bellows that are essentially convolutions that will allow compensation for expansion and contraction based on temperature changes in the system. When such piping systems are subjected to extreme and volatile temperatures, the drastic temperature shifts cause expansion when the piping heats up.

Based on the operating temperatures of a steam system, that difference could be quite a few inches. Add on the length of the overall joint, and the diameter of the pipe and joint, you will end up with several square feet of very hot system emitting heat into your mechanical spaces.

Insulated jackets from Thermaxx are a great solution to insulating this piece of equipment. Not only are there many different designs and shapes that need to be accounted for, but also the movement itself creates a challenge from an insulation standpoint.

Designing the jacket is a key piece to properly insulating an expansion joint, as there are many designs and configuration of joints, including those with lube ports and supporting brackets. Proper materials contribute to a successful install, like Teflon jacketing material to allow for easy movement as the joint expands and contracts.

As with all parts of your mechanical system, there are valuable BTU’s escaping if the system isn’t insulated properly. There is no reason to leave the expansion joints bare and waste valuable heat and money.

Common Grooved Pipe Expansion Joint Manufacturers are Victaulic & Tyco Mechanical

Insulating Pipe Expansion Joints
Expansion and the subsequent contraction puts a great deal of stress on pipes and drastically increases the chance of cracking, which can lead to heavy repair and replacement costs and problematic failures. Expansion joints absorb movement, vibration, and – as its name implies – expansion in the system. Because the expansion joint must be flexible, hard stay-in-place insulation is often not a viable option. As a result, expansion joints frequently go completely uninsulated.

Thermaxx Jackets Removable Insulation Jackets for Pipe Expansion Joints
Expansion joints used in high temperature systems can become extremely hot and can account for significant waste of valuable energy. If this is the case in your plant, we urge you to consider removable insulation jackets.

  • The Right Fit: Our pipe expansion joint jackets are part of our standard product line and come in sizes from 2” -12”.  If a different size is required, we can also design a custom product too.
  • Convenient:  These insulation jackets come equipped with velcro and d-rings for your convenience as well as seal flaps to connect the jacket to insulation.  For most applications, our insulation covers can accommodate the necessary movement of the expansion joint. Unlike hard insulation, our insulation covers do not interfere with the expansion joints ability to perform its necessary function – compensating for expansion.  Our insulation covers are designed to be taken off and put back into place easily. Personnel of any skill level can remove and replace the covers in a few short minutes.
  • Cost effective: Our jackets come in a standard thickness of 1″-2″. Expansion joints can get very hot, and much of the heat radiates away from the surface and out of the piping system, resulting in significant energy loss. Our expansion joint insulation covers prevent heat transfer, accommodating temperatures up to 6000F and keep energy where it belongs – in the piping system. If the expansion joint is in a risky location or the potential cost of failure due to accident is extremely high, our insulation covers can protect the internal bellows of the joint from damage or protect the expansion joint from weld splatter.
  • High Quality: We create these insulation jackets with the user and shelf life in mind.  That’s why we back each product with a 5-year warranty.

Got Questions? We’ll be more than happy to help you determine if and which types of insulation jackets are appropriate for your expansion joints and specific application. Contact us today!


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