A vacuum leak test is a crucial procedure used to measure the leak rate in microns per hour.
This test is essential for ensuring the integrity and performance of vacuum systems.
What is the range of a vacuum leak test? (3 Key Points)
1. Leak Rate for Critical Applications
For critical applications, such as the processing of superalloys or reactive metals, the leak rate should be less than 5 microns/hour.
2. Leak Rate for Normal Vacuum Applications
For normal vacuum applications, the acceptable leak rate is generally between 10 to 20 microns/hour.
3. Method of Conducting the Leak Rate Test
The leak rate test involves pumping the furnace down to a specified low pressure, typically 1 x 10^-4 torr or better.
The pumping system is then isolated from the furnace chamber.
The vacuum level is monitored and recorded after 30 minutes and again after 60 minutes.
The difference in vacuum levels over this period is used to calculate the leak rate in microns per hour.
This calculated leak rate is then compared against the acceptance criteria defined by the governing specifications.
This method ensures that the vacuum system maintains its integrity and performance.
It prevents any significant air or water leaks that could compromise the vacuum level and overall efficiency of the furnace.
The use of specific leak detection methods, such as the blowing method or the suction nozzle method with helium mass spectrometers, further enhances the accuracy and reliability of the leak testing process.
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