Quote:
Originally Posted by Myka
I'm with fkshiun on this one! If you pump 500 gph through a 1" pipe you will get a lot more psi coming out the end than you will if that pipe was 4". That's not difficult to wrap the brain around. However, it is much more difficult on your pump to pump the water through a 1" pipe than though a 4" pipe because it will have to work harder because of the resistance.
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Quote:
Originally Posted by banditpowdercoat
In theory, running a larger pipe will NOT increase head pressure because its measures in a 1" square area for PSI. BUT, the pump outlet is a specific diameter. Lets use 1" for this example. Now, take the 1" pump outlet and increase the pipe size to 4" for the rise up to the tank. Now the pump will only pump so much, Right? Should not pump any more GPH with a 1" pipe or a 4" when pipes are run horizontal. BUT. The weight of the water in the 4" pipe is much heavier than the 1" for each foot of pipe for the vertical rise. Now, the pump outlet is still 1" diam, even though the 4" pipe. This creates more head pressure at the PUMP because the pump has all the weight of the 4" pipe's water forcing into a 1" pipe. It's Hydraulics principle. The reason Hyd cylinders can have so much force with a little power input.
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Sorry but you folks are incorrect. First off more pressure doesn't mean more flow, yes the smaller the pipe the more pressure, head pressure so less flow. Actual head pressure is only a function of density, height and gravity not cross sectional area. You also however have losses from pipe design which includes pipe friction from pipe diameter, finish, flow regime, and the number and types of fittings used. Bottom line is the bigger the pipe the better as fiction reduces with larger pipe sizes, however you will max out the benefit depending on flow rate.