LNG conveying pipeline

Abstract

The invention discloses an LNG conveying pipeline. The LNG conveying pipeline comprises an inner pipe and an outer pipe, and a cavity is formed between the inner pipe and the outer pipe. The outer pipe and the inner pipe are the same in length. An inner pipe male head is arranged at one end of the inner pipe, and an inner pipe female head is arranged at the other end of the inner pipe. The inner pipe male head is matched with the inner pipe female head. An outer pipe male head is arranged at one end of the outer pipe, and an outer pipe female head is arranged at the other end of the outer pipe. The outer pipe male head and the outer pipe female head are matched. A first outer thread is arranged on the outer side of the inner pipe male head, and a first inner thread is arranged on the innerside of the inner pipe female head. A second outer thread is arranged on the outer side of the outer pipe male head, and a second inner thread is arranged on the inner side of the outer pipe female head. The first outer thread and the first inner thread are matched, and the second outer thread and the second inner thread are matched. According to the LNG conveying pipeline, thread connection is adopted, the work efficiency is high, the whole pipeline can be subjected to vacuum pumping after LNG conveying pipeline connection is finished, and the heat preservation effect is good.

Description

technical field [0001] The invention relates to a component of a fluid delivery pipeline, in particular to an LNG delivery pipeline. Background technique [0002] When using pipelines to transport LNG, the external environment has a great influence on the temperature of the liquid in the pipeline. The external environment mainly transfers heat to the liquid in the pipeline through direct heat conduction and heat radiation. Vacuum pipes are generally produced in sections and delivered to the site for assembly, usually by welding or flange connections. The welding connection is to weld the butt jointed inner pipes, and then wrap the insulation cotton at the joints for heat preservation. This method has many procedures, takes a long time, and the heat preservation effect is poor; the flange connection will cause the cooling capacity to be easily lost from the joint. It will lead to poor cold insulation effect and poor heat insulation effect at the joint. Contents of the inv...

AI Technical Summary

Problems solved by technology

The welding connection is to weld the butt jointed inner pipes, and then wrap the insulation cotton at the joints for heat preservation. This method has many procedures, takes a long time, and the heat preservation effect is poor; the flange connection will cause the cooling capacity to be easily lost from the joint. It will lead to poor cold insulation effect at the joint and poor insulation effect

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