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The rotary compensator is a new type of compensator for thermal expansion compensation in thermal pipelines. The structure of a rotary compensator mainly consists of components such as an integral sealing seat, sealing gland, reducers, anti-friction centering bearings, sealing materials, and a rotating cylinder. When installed on thermal pipelines, two or more units are required to be arranged together in groups, allowing for relative rotation that helps absorb the thermal displacement of the pipelines, thereby reducing stress on them. Advantages of rotary compensators: 1. They offer substantial compensation capacity; their placement can be adjusted according to the natural terrain and the strength of the pipes, with a single set of compensators capable of compensating for a 500-m section of pipe ； 2. It does not generate blind plate force resulting from medium pressure, allowing the fixing brackets to be made very small; it is particularly suitable for large-diameter pipes ； 3. Excellent sealing performance, no maintenance required during long-term operation ； 4. Investment **savings ； 5. Easy for design calculations ； 6. The rotary compensator can be installed on steam buried pipes, which helps to significantly reduce costs and improve operational safety. On main pipelines, rotary compensators are generally installed in groups of 150 to 500 meters apart (the spacing can be determined based on the natural terrain); there are over a dozen different installation methods, and the arrangement can be chosen according to the direction in which the pipeline runs. After installing this type of compensator, the spacing between the fixed supports increases; to prevent bending of the pipe section, it is necessary to add guide supports as appropriate. To reduce the frictional resistance during the movement of the pipe section, rolling bearings should be installed on the sliding supports.