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## Main Question or Discussion Point

Hello, first time on this site and wondered if any one could help me on what the proper equation or equations would be to answer this question.

I have a 300 cubic foot tank of nitrogen air that will provide nitrogen to a rectangular pipe at 5 psi with a flow rate of 10 CFM to atmosphere at the end of the rectangular pipe. The question is how long would it take the 300 cubic foot tank to empty?

I have a 300 cubic foot tank of nitrogen air that will provide nitrogen to a rectangular pipe at 5 psi with a flow rate of 10 CFM to atmosphere at the end of the rectangular pipe. The question is how long would it take the 300 cubic foot tank to empty?