Does anyone know the density of air at 2,500 PSI? One other Question.
Does anyone know the density of air at 2,500 PSI? One other Question.
(OP)
Just curious if anyone knows what the density of air is at 2,500 PSI? I'm assuming 70 degrees F for my calcs at a standard elevation.
One other question. I have been asked to determine how long a high pressure bottle of compressed air with a rated volume of 300 ft^3 can supply a piece of equipment downstream of a regulator before running out of air at the required pressure.
I figure the easiest way to solve it is to just do a mass balance on it and the density into the regulator times a flow rate = density out of the regulator times a flow rate. Sound right?
One other question. I have been asked to determine how long a high pressure bottle of compressed air with a rated volume of 300 ft^3 can supply a piece of equipment downstream of a regulator before running out of air at the required pressure.
I figure the easiest way to solve it is to just do a mass balance on it and the density into the regulator times a flow rate = density out of the regulator times a flow rate. Sound right?





RE: Does anyone know the density of air at 2,500 PSI? One other Question.
If you remove the air slowly, so that the tank stays at constant temperature, then your approach should work. If you're removing air fast enough, temperature in the tank will drop, giving you lower pressures than what you would expect.
RE: Does anyone know the density of air at 2,500 PSI? One other Question.
PV x (molecular weight of the gas)/RT = d
RE: Does anyone know the density of air at 2,500 PSI? One other Question.
RE: Does anyone know the density of air at 2,500 PSI? One other Question.
I suppose you would need to dry the air as or after it's compressed, or you would have liquid water in there, too, which would throw the numbers off some.
RE: Does anyone know the density of air at 2,500 PSI? One other Question.
280K 300K
150 bar 0.00529 0.00578
200 bar 0.00407 0.00446
Just interpolate for the desired T,P conditions.
RE: Does anyone know the density of air at 2,500 PSI? One other Question.
---then for an isothermal source, the rate of pressure decrease is directly proportional to the mass flow rate.
-----for an adiabatic tank, pv^k =constant which yields p/m^k= constant where p is source pressure and m the mass in the tank. k, the spec ht ration Knowing the flow rate from the regulator allows calculation of mass in the source as a function of time and therefore, the source pressure as a function of time.
RE: Does anyone know the density of air at 2,500 PSI? One other Question.