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Unformatted text preview: ChE 374Lecture 31Pump Scaling Series and parallel pumps: Series * Goal: provide greater head for the same flow rate * H tot = H 1 + H 2 * Pump performance curve is the vertical sum of each individual pump * bhp tot = bkp 1 + bkp 2 at the operating point * Issues: If the pumps are not the same capacity, then if the flow is too large, the smaller pump may operate beyond its free delivery flow rate (beyond where its H drops to zero). At that poiint, the pump acts as a loss, not a gain in head, and damage may result. In this case, shut off the pump and bypass it with a valve. This is not a problem for equal sized pumps. Parallel * Goal: increase V for the same head * Pump performance curve is the horizontal sum of each individual pump * H 1 = H 2 * V tot = V 1 + V 2 * bhp tot = bkp 1 + bkp 2 at the operating point * W whp = g V H tot * = g V H tot /bhp tot * Issues: Different sized pumps: if head is greater than the shutoff head of the smaller pump,...
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This note was uploaded on 03/11/2012 for the course CHE 374 taught by Professor Davidlignell during the Fall '12 term at Brigham Young University, Hawaii.
- Fall '12