Long distance buried steel pipeline corrosion monitoring probe anti-corrosion detection technology and the status quo

So far, with the rapid development of our country's economy, strategic planning and market growth in demand for oil and natural gas, oil and gas long distance pipeline construction in our country by leaps and bounds, and by the end of 2012, our country has built in oil and gas pipeline total length of 90000 km, and in the next ten years, our country will also be new oil and gas pipeline 50000 km. Built China's first since 1959, xinjiang karamay oil field oil and gas transmission pipeline to dushanzi refinery crude oil pipeline, development up to now, the development of China's pipeline construction has been 55 years, pipeline the strategic position in national economy is becoming more and more significant, at the same time also more and more get people's attention to the safe operation of pipelines. With daqing, liaohe and victory in the 1970 s, such as the eastern large oilfield development, the Chinese built the northeast, north China and east China region of the pipeline network to now, most of the buried steel pipeline is an average of nearly 30 years of service, in general, the service life of pipelines for 50 years, so the pipeline safety accidents is entering the period of China. One of the pipeline caused by corrosive perforation leakage accidents occur frequently, brings huge economic losses and social impact and environmental hazards. Oil and gas pipeline detection work regularly, therefore, it is particularly important. Today, developed countries attach great importance to detection of oil and gas pipelines into a lot of research, although our country also to oil and gas pipeline detection and the introduction of the research, but also in its infancy, determine the precise location of oil and gas tubes breakage point in time, the overall status of coating and cathodic protection system to reduce the potential factors of unsafe, reduce the economic loss.

Soil is a oil and gas, also, the three material stocks of capillary porous complex systems, the soil moisture, dissolved salts, electrical conductivity, soil physical and chemical properties of inhomogeneity, and electrochemical inhomogeneity of metal materials, metal electrochemical corrosion in soil. Has a tendency to stray current through the metal corrosion caused by soil. In some anoxic soil bacteria and microbial metabolism also took part in the corrosion process. Corrosion monitoring probe international soil for buried steel pipeline corrosion control option is to use an external anti-corrosion layer and the cathodic protection method of protective measures. Including external anticorrosion coating is major means of corrosion protection, cathodic protection as a supplement. External anticorrosion coating selection more petroleum asphalt anticorrosive coating, coal tar enamel coating, dissolving epoxy powder coating, polyolefins adhesive tapes, three composite structure anticorrosion layer, the foam thermal insulation layer. So, external corrosion of soil corrosion including external anti-corrosion coating nonmetal and soil external anti-corrosion layer metal pipeline corrosion failure