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What are the common types of sleeve compensators?
Release time:
Jan 19,2022
What are the common types of sleeve compensators? Typically, conventional sleeve compensators use oil-impregnated asbestos packing as the sealing material. The packing is arranged in multiple concentric rings inside the stuffing box and is compressed by a pressure flange. When the pipeline contracts, the inner tube moves relative to the outer tube, and the oil-impregnated asbestos packing ensures a tight seal between the two.
What are the common types of sleeve compensators? Typically, ordinary sleeve compensators use oil-impregnated asbestos packing as the sealing material. The packing is arranged in multiple concentric rings inside the stuffing box and is compressed by a pressure flange. When the pipeline contracts, the inner tube moves relative to the outer tube, and the oil-impregnated asbestos packing ensures a tight seal between the two.
As the number of relative movements between the end ring and the gland increases due to bolt tightening, gradual wear and tear occur. Consequently, leakage is likely to happen, requiring frequent replacement of the packing material, which in turn leads to substantial maintenance and inspection efforts. In an elastic sleeve compensator, under the action of a spring, the sealing packing is constantly kept in a compressed state.
This prevents leakage of the medium within the pipe. The flexible sleeve compensator features a corrosion-resistant stainless steel sleeve; thanks to its smooth inner surface and short packing length, axial thrust is minimal, reducing packing wear, minimizing excessive maintenance workload, and extending service life. However, due to the inclusion of a spring, the cost is relatively high. It is therefore less suitable for large-scale applications in the thermal power industry.
The injection-type sleeve compensator allows the sealant to be injected from the outside through an injection port, and it can also facilitate remote injection over long distances. The sealant boasts excellent self-lubricating properties and a low coefficient of friction, providing protective effects on the mating surfaces. Different formulations of sealants can accommodate media at various temperatures. However, due to the presence of the injection port, this type of compensator cannot be used in directly buried pipelines.
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