The pipe inner coating technology

Pipe internal  coating construction technology at present, the gas pipeline inner coating of drag reduction technology in Europe and the United States developed countries has been widely used in pipeline industry, for example, Canada and Germany has built large diameter pipeline, spray on the inner wall of the pipeline, epoxy coating, in order to reduce the friction of gas transportation. To make the internal coating of drag reduction technology in pipeline reflect its good characteristics in the actual operation, we must attach importance to pipeline inner coating, because the pipeline inner coating is a key technology of the internal coating construction, internal coating quality will directly influence on the performance of the internal coating technology and service life. Could be attained only the use of advanced and reliable technology, high quality of coating steel pipe, and effectively extend the service life of pipeline, greatly improve the efficiency of the pipe production run after.

Pipe internal coating technology research starts late in our country, especially in long distance, large diameter gas pipeline engineering has not yet been application examples, to strengthen the research. As astringent NingLan, zhong wu, west to east gas pipeline length for the construction of gas pipeline, internal coating drag reduction technology will get promoted, therefore, must carefully study and master the coating technology of internal coating, strictly control the quality of the coating process, promote the application of internal coating technology in our country.

The inner coating technology at home and abroad, the development level of the pipe coating process and equipment is with the development and application of various anticorrosive coatings in and continuous development. Tennessee gas pipe in 1955 for the first time in practical application of coating steel pipe. After decades of development, with the practical value of the new technology and new technology appear constantly. Many foreign famous steel pipe plant and pipeline construction engineering company has accumulated rich practical experience, such as the German mannesmann, Japanese NKK and Dutch Selmers, NOVA, Canada, the United States of CRC and Singapore BrederoPrice company, has a complete and suitable for different pipe diameter and length of surface pretreatment and spraying production line, and have many years of construction experience and good performance. Overall, foreign companies in coating production line technical level is higher than domestic, and its high degree of automation equipment, low failure rate, trouble-free operation time is long, wide suitable diameter range and the overall coating quality is reliable. For the Japanese steel pipe (NKK) flow chart of the internal coating carbon steel pipe.

Although coating in the pipe coating aspects in China started late, but in recent years, various oilfields are successively set up the pipe coating technology team for tackling key problems and coatings used in internal coating, the inner surface pretreatment and sprayer and so on has carried on the deep research, has obtained many encouraging results, such as daqing YouJian construction technology research institute of successful development of medium and small diameter pipe internal coating a film forming technology, can improve the efficiency of 34 times; Construction technology research institute of China petroleum and natural gas corporation successfully developed steel pipe inner surface of powder electrostatic spraying technology, ensure the quality and safety of the pipe inner coating production; Zhongyuan oilfield, shengli oilfield developed internal coating of steel pipeline repairing patch coater machine and coating detection, which can realize repairing, testing, integration, fill the blank of domestic pipe internal coating repairing technology. Recently, victory YouJian pipe 2 CRC introduced from the United States within a liquid epoxy coating and coating production line, can be completed within 60 920 mm diameter of coating operations. The results of this study greatly shorten the gap with developed countries, to promote the oil and gas pipe internal coating technology promotion and application in our country.