Which system will create more dynamic pressure?

Question

Ive had an ongoing debate about pipe sizing and wether or not reducing the size of the pipe on a given valve as you go will help any as far as dynamic pressure for the sprinklers example. 10 sprinklers evenly spaced over 300ft of pipe. In one system the pipe size is reduce as it goes. It starts at 2" pvc and ends at 3/4" pvc. The second system runs 2" pipe the entire length. Which system under the most ideal conditions will have better dynamic pressure ie. Get the water to spray better from each sprinkler?

fluffernut · Answer

How much water are you going to need for 10 heads.....total GPM.  Curious if you are staring with 2 inch pipe.  I don't have the charts anymore.  What is the friction loss for the 300 feet plus the fittings?  Yes, if pressure is going to be a problem, you are skating on the pressure edge, keeping the pipe size up a size to reduce friction loss makes sense.  Staying with 2" seems a bit wasteful.  For sure you are not loosing pressure......so in theory your friend is right. If you are running more water than a 3/4 inch line can manage.....greater than about 8-10 gpm for feed a big sprinkler head, squishing it down into a 3/4 inch will increase velocity and result in the water "vaporizing" as it comes out.  Pressure will remain the same.  You can only increase pressure with a pump or by causing the water to fall......run down hill.  You loose pressure through friction loss due to pipe size, length and any bends, fittings, etc it must pass.

Anonymous · Answer

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Which system will create more dynamic pressure?

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