Testing on oil pipeline

The development direction of the oil pipeline testing technology
Oil pipeline usually been in running from within and outside environmental corrosion, internal corrosion mainly by the transmission medium, pipe joint effusion, dirt and pipeline stress formed; external corrosion is usually due to failure of the coating, failure to produce. The internal corrosion commonly used love pipes, corrosion inhibitor and other means to deal with in recent years with the strengthening of the pipeline owners of the pipeline operation and management, and the stringent requirements of the transmission medium, internal corrosion in large part to get control. At home and abroad oil pipeline corrosion control main development direction of the outer anti-corrosion, pipeline inspection focusing on coating defects and pipe defects due to external corrosion caused by. In recent years, with the widespread popularity of computer technology and applications, domestic and international testing technology has been rapid development, pipeline inspection technology gradually formed pipe internal and external detection technology (coating detection, intelligent detection) two branches. Under normal circumstances, the coating is damaged, the failure at the bottom of the pipeline is also subject to corrosion, the pipeline external detection techniques aim is to detect the coating and cathodic protection on the basis of the validity of, to achieve the purpose of detecting the tubular body corrosion defects by digging detected, and for The most current layout North The condition is detected in the pipeline is very effective. In-line inspection technology used to discover both inside and outside the pipe corrosion, local deformation and weld cracks and other defects, but also indirectly determine the integrity of the coating.

Outside of the pipe detection technology
Buried pipeline commonly used coating and the power-law protection (CP) protection system consisting of the combined effects of external corrosion control plays a complementary role of these two methods: the coating is cathodic protection that is economical and effective, and cathodic protection also coating to pinholes or injury under control. The method has been recognized as the best protection approach and has been widely used for corrosion control of buried pipelines. Coating detection technology is in pipeline excavation under the premise of, use of special equipment on the ground non-contact coating comprehensive performance testing, scientific, accurate and economical aging and damage the coating defect positioning, the size of the defect classification statistics, a comprehensive evaluation of defect size, number and proposed corrective action plan to guide the pipeline owners grasp the pipeline coating condition and maintenance, and practical to ensure the integrity of the coating and integrity. Domestic implementation of the outside of the pipe detection technology began in the mid-1980s, the detection methods include standard pipe / ground-sensing Pearson (Pearson) the coated insulation resistance test tube current test. The test results an important role in the overall evaluation of the coating to the accurate positioning, but the defect, reasonable guidance overhaul there was still a big gap. In recent years, the World Bank loans, and exchanges with foreign pipeline company, outside of the pipe testing equipment due to the price is relatively cheap, more convenient operation, the foreign pipeline outside the technology has been widely used in Petroleum Pipe Coating detection, currently the outside of the pipe detection technology basically reached the advanced level of developed countries, which is widely used in practical work outside the detection technology include: standard pipe / ground-sensing, Pearson detection, fine-pitch potential test, the audience current multi-frequency test, DC gradient test.

In-line inspection technology
In-line inspection technology is a variety of non-destructive testing (NDT) equipment on the Island pig (PIG), originally used as a purge of non-smart changed information collection, processing, storage and other functions of intelligent pipeline defect detection (SMART PIG), through the movement of the pig in the pipeline to achieve the purpose of detecting pipeline defects. As early as 1965 U.S. Tuboscopc had the magnetic flux leakage (MFL) non-destructive testing (NDT) technology successfully applied to the inside of the oil pipeline detection, followed by other non-destructive testing techniques have also generated, and try to find the broad application prospects. Famous foreign monitoring company by the United States Tuboscopc GE PII, the UK's British Gas, Germany Pipetronix, Corrpro Canada, and its products have basically reached a series and diversification. Within the detector can be divided according to the functions used to detect pipeline geometry deformation diameter measurement for pipeline leak detection, magnetic flux leakage detector for detection of volumetric defects due to corrosion, used in crack plane defect detection vortex detector, ultrasonic detector, and based on the elastic shear wave crack detection equipment.