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<br />001692 <br /> <br />Friction and other losses in power penstock (Q = 1,000 :ft?/s). <br /> <br />.~ ~ <br /> <br />Item Fonnula Data and computations Maximum loss Minimum loss <br /> (n = 0.012) (n =0.008) <br />Wyebranch 0,75 hv 0.75 (3.57) 2.67 2.67 <br />Friction in pipe Manning L = 141 ft, 11O-inch dia. 0.70 0.31 <br /> s max = 0.00496 <br />Upper bend 0,25 (6190)1/2 hv 0.25 (19.4/90)1/2 (3.57) 0.41 0.41 <br />(~=19.4) <br />Lower bend 0.25 ~90)1/2 hv 0.25 (16.6/90)1/2 (3.57) 0.38 0.38 <br />~= 16.6) <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 eef90)112 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 />Bend t&'= 0, 60) 0.25 eef90)l/2 hv 0,125 (60/90) 1/2 (4.85) 0.50 0.50 <br />Butterfly valve 0.3 hv 0.3 (4,85) 1.46 1.46 <br />Reducer to 6O-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 0.11 <br /> s max = 0.0314 <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 />