Connection changing method for low-flame-point material pipeline

Abstract

The invention provides an internal-plugging device for cleaning a low-flame-point material pipeline, belonging to the technical field of material pipelines. According to the invention, the method comprises the following steps: 1) preparing a low-flame-point material in a reflux pipeline; 2) cutting off an intended butt joint position of the pipeline to form a new pipe orifice; 3) pressing in a piston from the pipe orifice to the pipeline so as to lead the piston to move in the pipeline to the position meeting the required distance of the welding operation safety requirement; 4) cleaning a section of the pipeline between the piston and the pipe orifice by water, removing the low-flame-point material residues in the section of the pipeline; 5) installing and welding a flange on the pipe orifice; and 6) pulling out the piston from the pipeline and butting joint the pipeline with another pipeline through the flange. The device provided by the invention comprises a piston and a piston pullrod, wherein a sealing ring is arranged on the circumference of the piston. By using the method and the device provided by the invention, the project difficulty in reducing the low-flame-point material during the connection-changing process of the pipeline can be reduced and the scrapped low-flame-point material generated in the process of pipeline transformation can be also reduced.

Description

technical field [0001] The invention relates to the technical field of material pipelines, in particular to a method for reconnecting low-flame point material pipelines and an internal blocking device. Background technique [0002] At present, when reconnecting low-flame point material pipelines, the low-flame point materials in the entire pipeline must be emptied first, and then the entire pipeline should be cleaned, and the pipeline can only be cut and connected after confirming that there is no low-flame point material in the pipeline Operation, that is, to carry out pipeline reconnection operations. However, since the length of the low-flame point material pipeline is generally long, the method for reconnecting the material pipeline requires cleaning the entire pipeline and detecting the content of the low-flame point material in the entire pipeline. It takes a long time, and there is also the disadvantage that a large amount of low-flame point waste materials generated...

AI Technical Summary

Problems solved by technology

However, since the length of the low-flame point material pipeline is generally long, the method for reconnecting the material pipeline requires cleaning the entire pipeline and detecting the content of the low-flame point material in the entire pipeline. It takes a long time, and there is also the disadvantage that a large amount of low-flame point waste materials are difficult to deal with after cleaning the entire pipeline

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