Tsykh V. Development of method and instrument for buried pipelines coating damages monitoring

Thesis is devoted to the issue of coating monitoring of buried pipeline situated at the oil and gas complex production facilities. The analysis of basic methods and equipment for buried pipelines insulated coating monitoring is realized. All existing coating defects are divided into two types: holes and coating disbondings. Coating disbonding damage singularity and its influence on buried insolated pipeline electrical parameters variances is analyzed. The feasibility of the phase electromagnetic testing method for such damages detection is proved. An analytical model of specific phase displacement for buried pipeline section with coating disbonding is deduced. An experimental model of buried pipeline section with coating damages is planed and constructed. The technique of experimental investigations and operative embodiment of information and measuring system are developed. The measuring of the information-bearing parameters at the model of buried pipeline is made. A complex method for coating damages detection and identification on the basis of two information-bearing parameters analyzes (the range and the phase of pipeline current) is developed. The technique of buried pipelines coating damages detection is suggested whereby a standardized document project has been developed.