![]() ![]() However, a main limitation of this method is that it is more sensitive to surface and near surface defects rather than interior ones. Those meeting the thickness requirement will be considered for subsequent remanufacturing processes. Before remanufacturing processes, the former can be used to select waste steel tubes of which the residual thickness is within an accepted range in spite of corrosion-induced reduction of the wall. ![]() At present, there are two main NDT methods used in remanufacturing production processes of deep and long composite pipe parts, i.e., the magnetic flux leakage method and the manual endoscope inspection method. The remanufacturing industry is still developing. Therefore, inner wall inspection has become an obstacle in both industrial production and actual service. For example, a specified oil extraction pipe is 9.6 m in length, while its external diameter is only 73 mm, which makes the aspect ratio more than 100. In oil industry, it is usually difficult to produce and inspect composite pipes with a high aspect ratio. The method is basically to synthesize a ceramic coating on the inner wall via self-propagation high-temperature synthesis (SHS) technology to abtain anti-corrosion and wear-resistance properties, thus turning the waste into new products. In recent years, a reliable remanufacturing method has been applied on discarded oil pipes. Their widespread applicability and large consumption have resulted in huge quantities of metal scraps. Long and deep pipes (the aspect ratio > 10) with thermal and mechanical properties are playing a significant role in a variety of fields including oil and gas exploration, nuclear power generation, etc. ![]()
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