​The corrugated compensator can absorb the expansion of the pipeline. The bellows expansion joint is a compensation device that uses the effective expansion and deformation of the elastic elements of the bellows expansion joint to absorb the dimensional changes caused by thermal expansion and cold shrinkage of pipes, ducts or containers.

It can absorb axial, lateral and angular displacement. In hydropower stations behind the dam, corrugated pipes (usually called expansion joints) are usually installed at the indirect joints of the dam and the lower flat section of the penstocks near the volute to compensate for changes in the penstock displacement caused by the direction of water flow and ground settlement.