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Structural features of sleeve compensators
Release time:
Aug 16,2021
The sleeve compensator, also known as a tubular expansion joint, is a compensation device used in hot-fluid pipelines. It is primarily designed to absorb and compensate for axial thermal expansion displacements that occur after straight pipelines have been installed. This type of compensator is directly installed in pipelines that convey non-corrosive fluids—whether flowing in one direction or multiple directions. Sleeve compensators are widely used in pipeline systems across various industries, including urban heating, metallurgy, mining, power generation, petrochemicals, and construction. The main components of a sleeve compensator include the sleeve (core tube), the outer casing, and sealing materials.
The sleeve compensator, also known as a tubular expansion joint, is a compensation device used in hot-fluid pipelines. It is primarily designed to absorb and compensate for axial thermal expansion displacements that occur after straight pipelines have been installed. This type of compensator is directly installed in pipelines that convey non-corrosive fluids—whether flowing in one direction or multiple directions. Sleeve compensators are widely used in pipeline systems across various industries, including urban heating, metallurgy, mining, power generation, petrochemicals, and construction. The main components of a sleeve compensator include the sleeve (core tube), outer casing, and sealing materials.
Structural features of the sleeve compensator:
It mainly consists of a sleeve (core tube), an outer shell, and sealing materials. It is used to compensate for axial expansion and contraction of pipelines as well as axial rotation at arbitrary angles. With its compact size and large compensation capacity, it is suitable for media such as hot water, steam, and oil-based fluids. Thermal expansion is compensated through the sliding motion of the inner sleeve relative to the outer shell.
The inner sleeve of the sleeve compensator is connected to the pipeline and employs a high-performance, self-pressurizing dynamic sealing principle and structure. It can freely slide within the outer casing as the pipeline expands or contracts, thereby meeting the sealing requirements of any pipeline. A new synthetic material is used for the seal between the outer casing and the inner sleeve; this material is highly resistant to high temperatures, corrosion, and aging, with an applicable temperature range from -40°C to 150°C, and even up to 350°C under special conditions. This design ensures both axial sliding and complete leak-proof containment of the medium inside the pipe.
The sleeve compensator is equipped with an anti-pull-off device that ensures it won't be pulled apart even when fully extended or contracted, thereby significantly enhancing the overall safety of the pipeline network.
The sleeve compensator is suitable for media with engineering pressures ≤ 2.5 MPa and media temperatures ranging from -40℃ to 600℃.
The sleeve compensator employs a new type of sealing material—the flexible graphite ring—which features high strength, a low coefficient of friction (0.04–0.10), resistance to aging, excellent performance, and ease of maintenance.
The sleeve compensator boasts a long service life, with a fatigue life comparable to that of the pipeline itself. Its sliding surfaces undergo special treatment, providing excellent corrosion resistance even in environments such as saltwater and saline solutions—more than 50 times better than that of austenitic stainless steel. Moreover, if the sealing performance weakens over the years due to wear, the flanges can be re-tightened to restore the sealing effectiveness. Alternatively, the bolts can be loosened, the compression ring removed, and one or two additional sealing rings installed before re-tightening the compression ring and continuing operation.
The sleeve compensator has no requirements regarding chloride ion content and is particularly suitable for systems where the chloride ion concentration in the medium or surrounding environment exceeds the standard.
Directly buried sleeve compensators can be directly buried underground, eliminating the need to install maintenance wells during installation and resulting in lower project costs.
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