Re: calculate air flow rate in pipe at given pressure and temperature.

Flow depends on many factors. Density and viscosity of the fluid are dependent on temperature and resistnce to flow depends on inside diameter and roughness of the pipe. These items are typically correlated on a chart called a MOODY diagram. Find one of these in an engineering book (like Marks Handbook for Mechanical Engineers) or perhaps on the web, and work through a couple of examples to learn how to use it so you can then apply it to your specific problem.