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The prefabricated direct buried compensator is resistant to soil pressure, can be self-oriented, can achieve the same life as a directly buried pipeline, and does not require maintenance and replacement. At the same time, it has good bending resistance and can be directly installed on the pipeline as part of a rigid pipeline. . What is the difference between a prefabricated direct buried compensator and an external pressure ripple compensator?
In the laying of hot water pipelines, many supports can be reduced to reduce engineering costs. Especially in the urban central heating pipe network has already occupied a considerable share.
Compared with the directly buried corrugated compensator, the external pressure corrugated compensator also has good bending resistance and can be directly installed on the pipeline as part of a rigid pipeline.
The compensator itself is provided with a drainage and drainage port, which can meet the intermittent heating system of high-temperature pipelines. In addition, the bellows is stretched when the external pressure corrugated compensator is working, which has higher stability than other types of axial compensators, and can largely solve the problem of instability during pipeline operation.
Due to the characteristics of its internal structure, it can greatly simplify and optimize the design work of the pipe network, and at the same time, it reduces the construction difficulty to a considerable extent.
Directly buried corrugated compensators and external pressure corrugated compensators are different due to different applications. The external diameter corrugated compensator with the same diameter is about 25% higher than the directly buried corrugated compensator. The external pressure corrugated compensator does not reflect the product's characteristics and functions in the hot water pipe network, causing waste of technology and functions.
Compared with the traditional trench installation, directly buried pipelines have a sufficient length, and the friction between the pipeline and the soil can prevent the pipeline from moving, form anchor points, and play a role of fixed supports, saving pipelines. Due to the fixed support, the direct buried pipeline has a series of advantages such as low engineering cost and convenient construction.
However, due to the difference in the length of the pipeline and the heating of the pipeline, the position of the anchor point will move, which will increase or decrease the compensation amount of the corrugated compensator on both sides of the anchor point, which will bring hidden dangers to the operation of the pipeline. During installation, the installation length of the compensator should be adjusted according to the installation temperature.
The ripple compensator that cannot be put into operation in that year should be adjusted to shorten the value according to the above formula. After the installation of the ripple compensator and the pipeline is completed, pipeline purging and system pressure test are performed.
The pipeline is separated from the equipment that does not carry out the purge and pressure test with a blind plate. After the two ends that are reliably installed are fixed, the purge and pressure test are performed. If the pressure test is performed in sections, when the blind end of the section is a secondary fixed support, temporary reinforcement measures shall be taken to prevent the fixed support from being pushed down.
Protect the ripple compensator during the system pressure test. When the corrugated compensator does not have a pre-tension rod structure, some accessories should be made on the corrugated compensator to protect the corrugated compensator, so as not to damage the corrugated compensator during pipeline pressure test.