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<br /> <br />001692 <br /> <br />Friction and other losses in power penstock (Q = 1,000 ft3/S). <br /> <br /> Item Formula Data and computations Maximum loss Minimum loss <br /> (n = 0.0]2) (n = 0.008) <br /> Wye branch 0.75 hv 0.75 (3.57) 2.67 2.67 <br /> Friction in pipe Manning L = 141 ft, llO-inch dia. 0.70 0.3] <br /> s max = 0.00496 <br /> Upper bend 0.25 eet90) I 12 hv 0.25 (19.4/90)1/2 (3.57) 0.4] 0.41 <br /> (~= 19.4 ) <br /> Lower bend 0.25 ~90)]/2 hv 0.25 (16.6/90)1/2 (3.57) 0.38 0.38 <br /> ~= ]6.6) <br /> Bifurcation to two See Tech. Record 3.57 + 4.85 [0.5- 1.22 1.22 <br /> 72-inch pipes 2cos30(28.3)/66.0] 2 <br /> Bend (&= 30) 0.25 eEW90)]/2 hv 0.25 (30/90) 1/2 (4.85) 0.70 0.70 <br /> Friction in branches Manning L avg = 45 ft, 72-inch-dia 0.54 0.24 <br /> (average) s max = 0.0119 <br />! <br /> Bend ~= 0, 60) 0.25 ~90)1/2 hv 0.]25 (60/90) ]/2 (4.85) 0.50 0.50 <br />I <br />I Butterfly valve 0.3 hv 0.3 (4.85) 1.46 1.46 <br />I <br /> Reducer to 60-inch 0.1 (hv2 - hvl) 0.1 (10.10 - 4.85) 0.53 0.53 <br /> Friction in 60-inch Manning L = 8 ft, 60-inch dia. 0.25 O.ll <br /> s max = 0.03]4 <br /> Head losses to units, Hf = 9.36 8.53 <br /> <br />Note: After s max is computed, s min can be calculated from the relationship, s minis max = (n minln max)2 <br /> <br />