Pipeline suitable for conveying ultralow-temperature medium

Abstract

The invention discloses a pipeline suitable for conveying an ultralow-temperature medium. The pipeline comprises a pipeline body and a functional layer arranged on the outer surface of the pipeline body; the functional layer is sequentially provided with a heat-insulation system layer and an anti-collision protection outer layer from inside to outside; the heat-insulation system layer comprises acold-insulation material layer and / or a vacuum cold-insulation layer; the cold-insulation material layer is realized in the mode that the pipeline body is directly wrapped with a cold-insulation material; the vacuum cold-insulation layer comprises an inner-wall sleeve and an outer-wall sleeve, two layers of sleeve pipelines are connected through a support, and a vacuum is formed between the two layers of sleeve pipelines; and a concrete sleeve serves as the anti-collision protection outer layer. According to the pipeline, the pipeline body is paved with expansion joints and the cold-insulationto meet process and soil environment requirements, the pressure bearing capacity of the pipeline meets the road requirement, a comprehensive scheme meets the relevant requirements of the burying environment, and the problem that chemical raw materials at the ultralow temperature (minus 162 DEG C) cannot be conveyed in a buried mode can be solved.

Description

Technical field [0001] The invention relates to a pipeline suitable for transporting ultra-low temperature medium, belonging to the field of petrochemical industry. Background technique [0002] The pipeline material for liquefied natural gas (LNG) is usually austenitic stainless steel, such as dual grade 304 / 304L, 304L, etc. The excellent low-temperature physical properties and low price of austenitic stainless steel make the material widely used in the LNG industry. However, due to the large shrinkage of the material, it is necessary to design expansion joints as a compensation for secondary stress. Although the design of expansion joints can effectively solve the problem of contraction of the secondary stress of the pipeline, it increases the design width of the pipe rack, and cannot realize the burying of ultra-low temperature medium pipelines, and it cannot meet the needs of low temperature medium submarine buried pipelines. It becomes LNG The technical bottleneck of the pi...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a pipeline suitable for transporting ultra-low temperature medium, and the present invention can solve the problem that ultra-low temperature (-162 degrees) chemical raw materials cannot be transported underground

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