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Volume / Pressure Conversion

Robert Leach
All,

I know this is not necessarily PCDMIS related but it is job related.

The note on the print says:

Max leakage at 5.5 bar: 5 cubic mm per second at atmospheric pressure.

I have a tester that can input 80 psi and I can measure the drop in pressure. For instance I can watch for 1 min and see that it drops to 70psi. Is there a way to convert this into something I can use to satisfy the print callout? Any help would be greatly appreciated.
Parents
  • No *****, and if you remove some of the mass of air within the smaller volume you can equate the 2 pressures meaning two different volumes at the same pressure.



    NO IT'S NOT. The ideal gas law will tell you the mass of escaped air. Using this mass you can then go back and recalculate for standard atmospheric conditions and find the volumetric flow rate. I am an engineer and this is very simple fluid dynamics. I have done these calculations many many times in the past. All he needs is the volume of the chamber he is pressurizing which should either be given or calculated, and if he has a CAD model then he can just get it off of there, and the state variables for the air.

    OK engineer man, whatever you said... You were right about other elements should take into consideration for this calculation, you can't do it without volume, this was taught in college chemistry, but I'm just an inspector not an enginneer. So, you win, have a good day.
Reply
  • No *****, and if you remove some of the mass of air within the smaller volume you can equate the 2 pressures meaning two different volumes at the same pressure.



    NO IT'S NOT. The ideal gas law will tell you the mass of escaped air. Using this mass you can then go back and recalculate for standard atmospheric conditions and find the volumetric flow rate. I am an engineer and this is very simple fluid dynamics. I have done these calculations many many times in the past. All he needs is the volume of the chamber he is pressurizing which should either be given or calculated, and if he has a CAD model then he can just get it off of there, and the state variables for the air.

    OK engineer man, whatever you said... You were right about other elements should take into consideration for this calculation, you can't do it without volume, this was taught in college chemistry, but I'm just an inspector not an enginneer. So, you win, have a good day.
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