There will be more or less air leakage in any vacuum system, which is inseparable from the user's process environment. The higher the vacuum environment, the greater the air leakage trend. In this case, the user It is a fairly common problem that the required vacuum does not meet the technological requirements. It is very important for vacuum technicians to check the vacuum system, find out the location of the leak, determine the size of the leak, and remove it in time.

The vacuum container still cannot reach the required vacuum degree after being pumped for a long time. There may be the following reasons: the vacuum pump and the vacuum unit work poorly, the material in the vacuum system is outgassed, the vacuum system leaks, and the air leak and outgas coexist. The simplest and most commonly used method to detect the above problems is the static boost method, which can easily detect the total leak rate of the pumped container and the system without using additional instruments or substances, and can determine where the problem lies. The static boost method is to use an appropriate vacuum gauge to measure the pressure of the container at regular intervals to obtain a pressure-time curve.

There will definitely be gas leakage in the actual vacuum, but if the total amount of gas leaking into the vacuum chamber does not affect the normal operation of the system, this gas leakage can be ignored. The maximum leak rate allowed by the vacuum system under normal operation becomes the maximum allowable leak rate. In the process of vacuum metallurgy, the vacuum pump must continue to pump air to maintain the vacuum degree of the system. This kind of system only requires that the pressure can reach the required vacuum degree when it is balanced, and the existing leak rate is also allowed.