Questions regarding the leakage rate of the vacuum system
Thread Content
This post was last edited by gwd1988 on 2022-11-3 at 15:56. The air leakage amount calculated according to the construction and acceptance specifications for steel pipelines carrying toxic and flammable media in the petrochemical industry differs significantly from the value estimated using empirical formulas; it’s really confusing
In the second method, density is a variable.
Based on this, once the vacuum pump reaches its maximum operating vacuum level, its exhaust gas consists of air leaks in the system plus gaseous solvents that have not fully condensed, right?
I would also like to ask regarding the first diagram: which standard is used in the formula for estimating the leakage amount? Thank you very much
The first formula should represent the total system leakage rate that needs to be taken into account when calculating the pumping speed of a vacuum pump, with the vacuum pump in operation； The second is the vacuum level test of the vacuum system, an indicator specified by the standards: the increase in vacuum level after the vacuum pump is turned off. There’s no comparison between the two, right? .
. The purposes and uses of these two formulas are different. The 50.7 kg/h in the previous formula refers to the maximum allowable exhaust volume of the equipment when the vacuum system is in operation and the pressure is maintained at 10 kPa, including leaks from the equipment’s dynamic seals. The 0.15 kg/h in the latter formula represents the allowable leakage amount, as estimated from the pressure testing results of statically sealed equipment. .