- #1
magneticanomaly
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Flow delivered by a pipe can be calculated from input pressure, inlet geometry, pipe length, and a flow coefficient related to pipe cross-section, shape, and roughness. If we create an example of a pipe attached at the bottom of a self-refilling standpipe, which automatically supplies a constant inlet pressure related to its height, let the height of the standpipe be 100 ft, and the length of the horizontal pipe be 1000 feet.
Inlet pressure will be 100 feet of water column. Static pressure along the pipe will vary, linearly I suppose, from 100 ft w/c at inlet to zero at outlet. Delivery will be x gallons per minute.
How will the delivery rate be different if the 1000 feet of pipe is arranged on a 10% grade, so that there is 100 ft w/c of pressure head available over the length of the pipe, but inlet pressure is zero, or negligible, because the pipe inlet is at the level of the surface of the reservoir feeding it?
Thanks!
Inlet pressure will be 100 feet of water column. Static pressure along the pipe will vary, linearly I suppose, from 100 ft w/c at inlet to zero at outlet. Delivery will be x gallons per minute.
How will the delivery rate be different if the 1000 feet of pipe is arranged on a 10% grade, so that there is 100 ft w/c of pressure head available over the length of the pipe, but inlet pressure is zero, or negligible, because the pipe inlet is at the level of the surface of the reservoir feeding it?
Thanks!