Well SeanB, that is what I am asking. I am unsure only because I have seen only one vague reference to the procedure.
And thank you chicopee I will try looking into it.
Again leak rates have units of Pressure*Volume/s not Mass/s. When detecting the leak, the leak rate is measured in that fashion giving units of Pa L /s, as an example.
So its not as simple as finding what fraction of the flow the contamination is.
I believe you are missing the point entirely. This section of the EPA protocol requires experimental data, where as I want to derive an estimate of the maximum acceptable leak rate into the process line to maintain a specific purity.
The equipment cannot be tested as we are not in possession...
I think I have come across a method in High-Vacuum Technology - A Practical Handbook (Marsbed H. Hablanian):
It states that 'if the temperature and species of gas are known, the pressure term in this case can be directly converted into density and hence mass flow.' So then, my example:
For...
Hi all,
I am curious, how does one convert between a contamination level of process flow measured in PPM to its corresponding leak rate.
As an example given a process flow with a known mass flow rate, gas species, pressure, temperature and allowable contamination level (say 0.2 PPM) how do we...
