Vacuum system installation
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Dear friends, you must have been exposed to a lot of design, installation, and debugging of high vacuum or vacuum systems. What do you think? In order to improve everyone's understanding of vacuum systems, I suggest that everyone discuss the technology in this area (mainly leak elimination technology). First, let me talk about my feelings. I have made several sets of negative pressure distillation tower systems, including a Φ2000X55000 tower and a Φ500X9000 tower system. The required working vacuum is about 10mmHg. A two-stage Roots water ring vacuum unit is used. During installation, the small flange uses metal gaskets. * * The orchid adopts carbon steel plate welding treatment. After leak detection and elimination of leak points with 2 kg of positive pressure, the vacuum leakage amount reaches the standard (less than 5%) at one time.
The water ring vacuum pump we used was easy to install. However, during debugging, smoke came out from the machine seal. Later, it was changed to an external one.* * Solve the problem after cooling the water supply ； Two sets of units were used, one in use and the other in standby. At that time, the two units were not well isolated and the vacuum degree of the system could not be increased. Later, the solution was solved by adding a fluorine-lined valve with good sealing performance.
High vacuum systems such as three-stage Roots pump water ring pump units and five-stage jet pumps can have a vacuum of less than 1kpa； The vacuum system requires no leakage or very small leakage. Otherwise, even if high vacuum equipment is used, it will be difficult to achieve the high vacuum during actual operation. It is best to use concave and convex surfaces instead of convex surfaces for flanges. It is best to use vacuum valves for valves to reduce external leakage. It is best to use winding mats or PTFE mats for mats. ； The resistance between the process equipment and the vacuum pump should be minimized, such as reducing elbows, valves, etc., so that the high vacuum of the vacuum pump can fully function.