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« on: July 08, 2007, 10:31:26 PM »
Relating to hicks flat's comments on the previous page about flow rates etc.
Re-reading the initial statement about forcing 64mm work of water through 50mm increases pressure is correct. When pumping volume, the larger the hose, the less pressure required for the same volume/flow rate, as hick correctly stated. however what the initial comment meant was that if you had fixed pump pressure and branch flow rate on a 64mm line, and you restricted the flow (ie adding a 50mm working length) the pressure inside the hose would increase if nothing else changed. Same as when you knock off a branch, the pressure inside the hose increases (except on a smaller scale as the restriction in flow is minimal)
To explain in a tangable fashion: (figures are not accurate - demo only)
A 64mm hose has a flow rate of 400GPM at 700kPa
A 50mm hose has a flow rate of 400GPM at 800kPa
A 200mm hose has a flow rate of 1500GPM at 700kPa (if the pump could do it!)
In lay terms, to achieve the same volume: the smaller the hose, the higher the pressure.
to achieve a flow rate of 400GPM in 50mm hose, Pressure would have to be 800kPa.
This is based on a branch with fixed flow rates, non adjustable etc (as in basic, hick)
I am also familiar with fluid mechanics my friend, and by over-complicating a simple issue, you have not only made your self seem like a jerk, but actually shown your stupidy in not being able comprehend the initial meaning of the statement. Brainiac...