What is the smallest size iron pipe you can use for a 165 ft. piping system designed to carry 900c.f. per hour of gas at 1 psi? Specific gravity is 0.6 with a total pressure of 1/2 inch water cone.

What is the smallest size iron pipe you can use for a 165 ft. piping system designed to carry 900c.f. per hour of gas at 1 psi? Specific gravity is 0.6 with a total pressure of 1/2 inch water cone.