Expansion Compensators are essentially a small diameter externally pressurized expansion joints where the bellows is protected by and guided within pipe housing. While the industry also offers an “internally” pressurized compensator to serve the same function, it is an inferior product, susceptible to bellows squirm. Only “externally” pressurized bellows offer stability under large axial movements in small diameter piping.

Compensators are used primarily in building riser systems to compensate for thermal expansion and concrete shrinkage. They are designed to absorb straight axial compression and extension and can be installed in horizontal piping as well. Proper anchoring is critical for longevity of your system. Piping should be guided in accordance with EJMA regulations.

Mark David Canada Inc. offers four types of expansion compensators: