Gas Flow in 1/2 Inch Tubing

look at this site:

http://www.pipeflowcalculations.com/

Thanks it is a great help much appreciated..

Neither; X*√2.

Re: I have searched the net until I have blured vision and headache trying to find a ballpark flow in some measurement of the CO2.. I am thinking that it will be totaly dependent on the flow per rpm of the motor. Am I correct? If the motor stalls then there will be no flow except for leakage and of course the faster I run the motor then the higher the flow.

Either the pipe or the motor can limit the flow. With an infinitely big (in diameter) pipe, infinitesimally short, the flow is limited by the rpm of the vane motor (and leakage around the vanes, etc.).

As the pipe gets smaller in diameter, and longer in length, it can start to limit the flow of CO2. You need to know the quantities involved--what RPM range do you plan to be running in, what is the displacement of CO2 per RPM of the pump, and what is the length and diameter of the pipe.

If there is another device being fed by the same CO2 source, you must know the displacement and speed range of that device. (And, will they be fed in parallel (or series).)

Thanks I have enough information at this time to get myself into trouble.. Or out of trouble.. time will tell..

Just enough information can be dangerous... but then again, that seems to be the way I operate most of the time.

Good luck, and be careful, 850 PSI of a compressible fluid can be very dangerous.

...especially if it is propelling a manhole cover in one's direction....

Do you have measurement of how much power you are generating? I suggest you to refer P-H (Pressure-Enthalpy) diagram of CO2 to get drop in enthalpy (per unit weight of CO2) from suction condition to discharge condition. For this you should know temp and pressure at discharge also. Measure it, its easy. Now, you can calculate CO2 weight flow rate just dividing generated power (in heat units) by drop in enthalpy.