Pipe dredging is a method applied to the drainage pipeline when it has not reached the protection specifications or is blocked. The purpose is to ensure the drainage function of the drainage pipeline. This operation is generally performed by the municipal protection unit. The use includes hydraulic dredging. , Winches, ball passing and high-pressure water jets, etc. The preparation of this plan requires an analysis of the thickness and primary composition of the obstruction in the pipeline. Pipe dredging can be done before or after the pipe is blocked. It is operated by trained and experienced protection workers.

Pipeline cleaning is a method performed before detailed inspection of the inner wall of the pipeline when the pipeline reaches the protection specification. The purpose of pipe cleaning is to clean the dirt attached to the inner wall of the pipe. Pipeline cleaning should be carried out after the water in the pipeline is drained to ensure that the pipeline will not be contaminated again after cleaning. The things for pipe cleaning are generally high-pressure cleaning vehicles, and some large pipe diameters can also use high-pressure water jets. The preparation of this plan needs to be combined with actual inspection needs and pipeline characteristics for inductive analysis.

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