Assembling method for jacketed pipe and its pipe lining apparatus

Abstract

The invention discloses an assembly method of jacketed pipes and a pipe inserting device. The method comprises the following steps: firstly, welding inner pipes of the jacketed pipes in pairs, and sheathing outer pipes of the jacketed pipes after heat treatment, weld seam detection and a hydraulic test; lifting the welded inner pipes while sheathing the outer pipes, and then lifting the outer pipes to ends of the inner pipes; mounting the pipe inserting device respectively on a front end and a rear end of the outer pipe; translating and sheathing the outer pipes outside the inner pipes one by one; and finally welding various outer pipes, and finishing assembly. The assembly method has the advantages of saving construction materials, having low equipment investment and simple construction steps, being capable of effectively protecting jacketed pipe materials and the like; and the pipe inserting device has the advantages of simple structure, convenient installation and use, less construction materials, lower equipment investment, simplified construction steps and the like.

Description

technical field [0001] The invention relates to a pipeline assembly technology and a device used in the assembly process, in particular to a casing assembly method and a pipe threading device applied to a pipeline dissolution system. Background technique [0002] Pipeline dissolution is a new technology adopted in newly built and expanded alumina plants in recent years, and it is one of the main processes for producing alumina by Bayer process. The core device of the pipeline dissolution system is a jacketed tube dissolution device. The current jacketed pipe production is to weld the inner pipe first, and then wear the outer pipe after the water test and pressure test are completed. When wearing the outer pipe, the inner pipe is usually fixed at a certain height with a manual hoist, and then the outer pipe is passed through the inner pipe section by section with a self-made trolley by laying the track, and then the outer pipe is welded. The existing construction method not...

AI Technical Summary

Problems solved by technology

The existing construction method not only requires a large one-time investment and large construction materials, but also has cumbersome construction steps and a long construction period

Correspondingly, the existing pipe threading device is also mainly a combination device that uses a small pulley to cooperate with the rail erection, but this device has many components, complicated installation, and a large investment in equipment, and it is not very convenient to use

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