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You're talking about the major head loss, which really has nothing to do with the fittings, I'm talking about minor head loss. Of course there will be less major head loss in a system if the velocity is lower, but what I was saying is that the fittings, if larger, will increase the minor head loss in the system. The thread IS titled "90 degree fittings" not "what size pipe produces the least amount of friction"
You should go back to school, maybe you will actually learn something next time.
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