Speaker
Description
This article mainly introduces the treatment of the internal leakage of the helium liquefier. The Linde L70 helium liquefier I run was found to be difficult to maintain the vacuum, the system is difficult to carry out. Gradual investigation of the problem, that is cold box internal pipeline leakage. Then I and my colleagues in the Linde company's proposal to develop a maintenance plan, the first pipeline separation, and then split the cold box, leak detection, welding repair. Because the leak is very small, leak detection takes a lot of time, try a variety of leak detection methods, and ultimately find the leak and repair successfully. After the repair, helium liquefier works well so far.The maintenance was carried out at the location of the plant, to avoid the cold box sent back to the original factory testing and maintenance. It is hoped that these experiences will help the helium liquefier users in a similar situation.