Research On Detection Technology Of Outer Anticorrosion Layer Of Gas Pipeline Crossing Section Of River

The number of pipelines across rivers in the oil and gas pipeline network is increasing year by year.Because the conventional detection method of buried pipeline on the road cannot be directly applied to the pipeline in the crossing section of the river,the situation of pipeline external corrosion protection cannot be accurately mastered,which leaves certain hidden dangers for the safety of pipeline operation.This paper takes the river crossing section of gas pipeline as the research object,and studies the relevant technology of detection of the outer anti-corrosion layer of pipeline crossing section.Based on the existing detection system of the outer anti-corrosion layer of pipeline crossing section,the paper carries out improvement research and conducts indoor and field tests.The main research contents of this paper are as follows:(1)Investigate the existing detection technology and corresponding detection system for the outer anti-corrosion layer of the underwater crossing section of gas transmission pipeline at home and abroad,analyze its performance characteristics and summarize its development direction.(2)Analysis of pipeline underwater crossing period of external anticorrosive coating testing system,the principle of the pipe system,the signal transmission model is established,the gas pipeline underwater crossing period of external anticorrosive coating evaluation methods were analyzed,and determine the R(tube circuit longitudinal resistance),L(tube circuit of inductance),C(tube circuit of capacitance),G(tube circuits of conductance)for measuring the parameters,such as key parameters,and study the related parameter variables affect change signal transmission pipeline.(3)The analysis of the existing gas pipeline crossing river section of the performance characteristics of external anticorrosive coating testing system,composition,etc.,determine the deficiency of system,on this basis,the proposed gas pipeline underwater crossing the anticorrosive layer outside segment detection system of a transmitter,a receiver and analysis software improvements,as well as new RTK positioning measurement integrated improvement program.(4)On the gas pipeline crossing river section of the external anticorrosive coating testing system for laboratory calibration,and the field test study on the system,the instrument on the function and use of the existing problems of further modify and perfect,in order to ensure the applicability of the equipment at the scene and functional integrity,and through the field tests verify the application effect of improved scheme.