Time required to exhaust air though an oriface 6

[cbuck]

Does anybody have the equation(s) to solve for time? I have a container (206 cubic inches) pressurized with air at 600 psi. I need to calculate the time required to vent to atmosphere through an oriface (dia = 0.228 in).
Thanks.

 

[TD2K]

CHD01, the example I was thinking about was a high pressure (5000 psig) injection gas compressor that was depressured on an ESD. The piping downstream of the piping significantly frosts up (in face, it chilled off close to the calculated gas temperature which was well below the allowable temperature for that piping but that's another story) while the piping upstream of the orifice did not.

 

[jparks1994]

A NASA colleague recently showed me that the differential equation for pressure and temperature versus time for gas venting from a vessel can sometimes be separated and integrated to closed form solutions for pressure or temperature versus time. I haven't worked through all the details yet, but when I get to it, I'll post the equations for your review. Also, they may be a bit complicated for posting in this text format. Is there a better way available to post equations with exponents and square roots and exponents inside square roots?

 

[quark]

[/sup]x<sup>2

For this you have to write like this. (/sup)x(sup)2

Put square braces[] for the words /sup and sup so that you will get the required result. For more details go to preview post button below the space where you make your posts. Go to editpost option and there you will find lot of useful tags.

Regards,

Repetition is the foundation of technology</sup>

 

[Haf]

jparks,

The paper I referenced above by J.C. Dutton goes into the differential equations and solutions, if available. There's a link to the paper in one of my above replies.

Haf