A TECHNOLOGY FOR TREATING INNER SURFACE OF TRUNK PIPELINES IN WELD AREAS

摘要

A technology for dressing and coating in weld areas on inner pipe surface and a device for its realization have been developed. The referred technology and device can be used to restore coatings damaged in the welding process, reduce hydraulic resistance, and extend service life of trunk pipelines.rnCurrently, special attention is being paid in the oil and gas industry to extending service life of trunk pipelines. This life depends essentially on the quality of corrosion protection (prevention) of outer and inner surfaces of trunk pipelines [1].rnVarious methods have been developed and are being used widely to protect the outer surface of pipes, especially in weld areas. For instance, after dressing of the weld, Trial-L type of thermosetting collar supplied by the St. Petersburg firm Khimbalt is put on it. The remaining part of the outer pipe surface is reliably insulated by what is called the VUS insulation supplied by the Moscow firm Evrotekhstroi. Such a technology helps extend the pipeline service life to as many as 20-25 years, but the cost in this case rises by 20-25%.