This is a complicated problem without knowing more about the air demand in the different units of the refinery. The best approach is to do a survey of usage rates by each unit. This could be difficult and time-consuming if meters aren't in place. If not, consider installing orifice plates at each unit. The idea is that 300 scfm is a lot of air. Using an estimate of about $250/ year/scfm, this is an additional cost of about $75,000/year; so the demurrage costs will have to be substantial. By doing a load capacity study at normal flow and at peak demand, it will be possible to determine how far you need to go back to the main header. This affects the overall viability of the project.
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