The main waterline into a tall building has a pressure of 90 psiaat 16 ft elevat

Question

The main waterline into a tall building has a pressure of 90 psiaat 16 ft elevation below ground level. How much extra pressure doesa pump need to add to ensure a waterline pressure of 30 psia at thetop floor 450 feet about ground?
I believe the steps would go 1) solve for P which = gravity*density*h 2) Add that to the needed pressure at top 3) Take value from # 2 and subtract the incomingpressure
But I hate ridiculous english units and cannot seem to makethem work out.
I believe the steps would go 1) solve for P which = gravity*density*h 2) Add that to the needed pressure at top 3) Take value from # 2 and subtract the incomingpressure
But I hate ridiculous english units and cannot seem to makethem work out.

Explanation / Answer

I think your steps are correct. What you're maybe missing is thefact that psia is pounds per inches squared, so you need to convertyour feet to inches before you do any calculating. (This goes forany other constants as well) Alternatively, you can just multiplythe psia by (144) to convert it to pounds per feet squared. Hope that helps.

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