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It has been a long time since I have performed a calculation such as what I am about to describe. I have been out of school for a while now, and just haven't had to use any of these skills in the work place. In any event, here are the parameters that are known at this point.

**Length**: 2,355 feet

**Pipe Pressurization**: 20 psi

**Diameter:**20-inch

**Compressor Flow Rate:**11.5 cfm

**Inlet Hot Tap size:**1-inch (This is the size of the tap we will be putting on the pipe to hook our pressure lines to).

**Product:**Air

**Piping:**Carbon Steel

What we are looking to figure out is how long it will take to pressurize this 2,355-foot pipeline to 20 psi. The pipe will be at atmospheric pressure once the hot taps are done and will be open to the atmosphere until the air lines are connected. For some reason I am thinking I need to go through the calculations via Hazen-Williams and then figure out pressure drops, but I am in the dark at the moment. I could be completely wrong at this point. I broke out my open channel hydraulics book for some pipe flow calculations, so I should be able to follow along.

Thanks