Anti-corrosion method of urban natural gas long-distance pipeline

Abstract

The invention discloses an anticorrosion method for an urban natural gas long-distance pipeline. The method comprises the following steps that rust in the natural gas long-distance pipeline is cleaned through a special pipeline internal cleaning device, rust outside the pipeline is cleaned through rust removing equipment, meanwhile, three concave grooves distributed at equal intervals are machined in the exterior of the pipeline through mechanical equipment and washed, then the interior and exterior of the pipeline are dried through a blowing drying device at the steady temperature, and the drying time is at least one hour. According to the method, anticorrosion layers are arranged internally and externally, the internal corrosion layer is poured onto the inner wall of the pipeline through a pressure device after being proportionally mixed with a foaming agent and water, cleaning and even smearing are conducted through the pipeline internal cleaning device, the internal corrosion layer is formed after cooling solidification, the external corrosion layer is arranged on the outer wall of the pipeline likewise, and the internal corrosion layer and the external corrosion layer are formed by mixing various components according to a certain weight proportion, so that the internal corrosion layer and the external corrosion layer have high anticorrosion capacity, and the anticorrosion effect is good.

Description

technical field [0001] The invention relates to the technical field of pipeline anticorrosion, in particular to an anticorrosion method for urban natural gas long-distance pipelines. Background technique [0002] Long urban natural gas transportation pipelines need to transport more natural gas, and steel materials are mostly used in existing pipelines. The interior of the pipeline is corroded by gases such as carbon dioxide in natural gas, making the exterior of the pipeline extremely vulnerable to strong corrosion; The outside of the pipeline is caused by an electrochemical reaction in the soil. The electrochemical reaction is due to the difference in potential between the pipeline and the soil electrolyte, forming a primary battery that causes electrochemical corrosion of the steel pipe, and the pipeline is deeply buried in the ground and is infiltrated by rain and snow. Underground and other weather factors lead to corrosion. The speed of pipeline corrosion depends on th...

AI Technical Summary

Problems solved by technology

[0002] Long pipelines for urban natural gas transportation have to transport more natural gas, and steel materials are mostly used in existing pipelines. The inside of the pipeline is corroded by gases such as carbon dioxide in natural gas, which makes the outside of the pipeline extremely vulnerable to strong corrosion; The outside of the pipeline is caused by an electrochemical reaction in the soil. The electrochemical reaction is due to the difference in potential between the pipeline and the soil electrolyte, forming a primary battery that causes electrochemical corrosion of the steel pipe, and the pipeline is deeply buried in the ground and is infiltrated by rain and snow. Underground and other weather factors cause corrosion, and the speed of pipeline corrosion depends on the composition of the soil, the type and quantity of salt, pH value, moisture content, resistivity, air permeability, bacteria and other factors; the existing anti-corrosion The method is only to delay corrosion by applying an anti-corrosion layer, but the effect is not good

Images