Research on the reliability of X70 steel gas pipelines under SRB main control factors

Abstract

Sulfate-reducing bacteria (SRB) corrosion is the main type of corrosion that occurs when steel for transportation gas pipeline (X70) passes through the soil.Based on the actual corrosion data of hanging pieces in an engineering site and SRB preparation liquid experiments, the corrosion characteristics of X70 pipeline steel under the action of SRB were studied, and the safety of gas transmission pipelines was evaluated. The weight-loss method and scanning electron microscope analysis method were being used. According to the industry standards, the SRB biofilm protection efficiency was selected as the evaluation index to analyze the pipeline safety capabilities. The research results are as follows: (1) Considering the main control factors for SRB, it is found that the corrosion behavior of X70 steel was related to biofilms, SRB metabolism and the formation of corrosion products; (2) the railway crossing section had the highest degree of corrosion, and the areas adjacent to it were also seriously corroded. There was a certain connection between stray current and SRB corrosion, so as to determine the promotion effect of stray current on SRB corrosion. The processing capability was assessed to be severely insufficient, requiring and corrosion and pressure resistance tests. In engineering, high-performance materials or temporary coatings can be used, but targeted microbial control based on the SRB corrosion mechanism has greater engineering value.

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“…Nevertheless, after being immersed in the SRB medium for 4 days, i corr decreases, probably due to biofilm formation [58]. The biofilm that forms on the metal surface effectively decreases the ionic and electronic conductivity of steel [59][60][61]. After immersion for 11 days in the SRB medium, i corr starts to increase.…”