Pipe Flow Calculations Forum

Again thank you for your efforts and continuing to assist me. I now have enough information to scale the tanks I am going to be using.

Thank you very muck for your time and trouble, this information will be very useful.

I need to calculate the flow rate of air through a 3/4" orifice from the pressurized side of a 1000 PSI (~250 cu ft at pressure) tank to the open atmosphere and know the time it will take to release 20% - 35% - 50% of the volume of the pressure tank. Tank size ~1.5 cu ft at atmospheric pressure...