In the oil, gas vehicles, the pipeline transport plays an irreplaceable role in the oil and petrochemical companies an important part of the infrastructure, pipeline operation and management of infrastructure construction management work is the most important part. Pipeline coating a long time since the emergence of underground aging, brittle hair, stripping, off cause pipeline corrosion, pipeline leakage or even fatal incidents often occur; in urban construction, road construction and other third parties is not clear due to pipeline construction exact location of the leak caused by the transmission medium, explosions and other accidents are not unusual. Meanwhile stray current will also have a very strong pipeline buried metal corrosion, cathodic protection techniques for pipelines also has a amazing role in the destruction. To avoid security incidents, to ensure pipeline in the physical and efficient integrity of the pipe inspection always less than control, pipe inspection to identify defects in the outer protective coating, is important to grasp the pipeline route.
According to data, the bulk of our oil and gas pipelines have entered the pipe inspection and defect fixes necessary cycle planned for the pipeline coating modified desperately needed. My company based on years of experience in construction for pipeline coating repair and protect defect removal, master pipeline route and provide an important scientific basis for depth.
Pipeline rust main reasons are: soil chafing, air corrosion, stray existing pipeline corrosion hazards of oil, natural gas, city gas and normal water offer pipes buried outer coating time since the emergence of prolonged aging, brittle hair, burning, off, In case of leakage will cause incalculable economic loss and security threats. Complex Services 1, outer coating testing ground trenchless underground pipeline detection and mapping the outer pipe coating damage detection, location, seriousness of the damaged point to classify the restoration of top priority outer coating warmth performance evaluation, grading pipeline coatings Comprehensive assessment report and corrective recommendations 2, cathodic protection cathodic protection system parameters state detection test tube ground potential (powered off) test DC voltage gradient and close interval potential test (DCVG, CIPS) evaluate the effectiveness of the cathodic protection system 3, the spurious Current test pipe breakage stray current inflow and discharge direction and size of AC interference voltage, current density test tube ground potential (powered off) 4 24 hours of nonstop testing, soil testing soil medium corrosive corrosive situ perseverance of soil properties Analysis of soil corrosivity evaluation of soil resistivity trials