Research On Microwave Nondestructive Testing Of Oil Tanker Pipeline And Oil Storage And Transportation Pipeline

Petroleum is the "blood of industry" and has played an irreplaceable role in the development of global industry,while also making outstanding contributions to social and economic development.The utilization of petroleum cannot be separated from transportation.At present,tanker piping and petroleum storage and transportation pipelines are the main methods of petroleum transportation.At present,China's oil imports are mainly concentrated in the Middle East and Africa.In 2017,global crude oil seamount was 40.1 million BPD,of which China accounted for 19%,reaching 7.8 million BPD.Due to geographical reasons,the main channels for China's oil imports are stored and transported through tankers.Oil spills will cause serious environmental pollution problems and large economic losses.To ensure the safe and stable transmission of oil and gas,it is necessary to conduct regular safety testing on pipelines.At present,non-destructive testing methods are often used in oil and gas pipeline testing,such as ray testing,ultrasonic monitoring,magnetic particle testing,etc.are commonly used non-destructive testing methods.These methods have their own advantages and limitations.In recent years,microwave technology has developed rapidly and has been applied to the defect detection of tanker piping and oil and gas pipelines.In this paper,the non-destructive testing of oil tanker pipeline and petroleum storage and transportation pipelines based on microwave reflection is studied.The designed monitoring system has the characteristics of high detection efficiency and high detection accuracy.The oil tanker pipeline is basically the same with the oil storage and transportation pipeline material,mostly carbon steel,both oil tanker pipeline and oil storage and transportation pipelines can be regarded as microwave waveguides.In this paper,firstly,the principle of nondestructive testing of tanker lines and oil storage and transportation pipelines surface based on microwave reflection is summarized;Then the experiment is designed to build a microwave metal pipeline surface nondestructive testing system.Combined with the actual situation of the types of defects(such as pipe wall corrosion,cracking,depression,weld defects,etc.)of the oil tanker pipeline and the oil storage and transportation pipelines,using the above defects with the pipeline material specimen preset simulation experiment was carried out,the signals that can be used to locate and identify the defects are studied and extracted,and the response curves between the parameters and the location and size of the defect are determined;Then the variation rule of reflected signal of pipe defect under the condition of changing distance between waveguide probe and specimen is studied,and compares the similarities and differences between other indicators under the ordinary detection conditions;The safety evaluation criteria and evaluation methods of pipelines with defects in service commonly used in the world is studied in this paper,a defect rating method for the oil tanker pipeline and the oil storage and transportation pipelines is designed according to the specifications of parameters such as the types and sizes of defects in each standard.Taking an example as the background,this method is used to evaluate the defect grade of an oil pipeline project.In this paper,the nondestructive testing system of microwave pipeline is designed,and various influencing factors of microwave technology applied to pipeline testing theory are analyzed in detail.It provides a defect detection and rating method for detecting/locating defects,determining defect size and evaluating defect grade.