Inspection Scheme Design and Corrosion Risk Assessment of Gas Pipe-Jacking Pipeline

Abstract

In view of the imperfection of the pipe-jacking pipeline corrosion parameter detection device and testing system，a set of flexible surrounding pipeline detection device was designed.With the support of ground test pile，this device could measure relevant potential and current easily，meeting the data requirements of corrosion risk assessment.Finally，the resistivity calculation of the anti-corrosion layer based on the current potential method，the judgment of the damage point of the anti-corrosion layer based on the close interval potential (CIPS)，the diagnosis of the sacrificial anode performance based on the current trend，and the prediction of the corrosion rate based on the current density of the test piece were established.Furthermore，the single risk assessment methods regarding the electrical resistivity of the anti-corrosion layer，the damage point，the sacrificial anode performance，the cathodic protection effect and the corrosion rate were formulated.The comprehensive evaluation system of corrosion risk of the local monitoring points and the whole pipe section was established，which would have great guiding significance for the preventive management of the pipeline.

Keywords

• pipe-jacking pipeline|detection device|corrosion parameter collection|performance evaluation|corrosion evaluation system