Question

Water is pumped from a well to a water tower (an above-ground reservoir) through a 330 ft long galvanized iron pipe (ε-0.0005 ft) with a 2-in diameter. The water surface in the well is 10 ft below the ground and the water surface in the tower is 60 ft above the ground. The water is to be delivered at a rate of at least 370 L/min. The sum of the minor loss coefficients is 2.1 a) Using the pump performance curve provided from a pump manufacturer (see figure below), which pump will you choose to meet the needs of this project? (Hint: you will need to derive the system curve, and you must convert Q from cfs to gpm in your equation.) Based on your choice for part a), what is the maximum height that the pump can be placed above the ground if the length of the pipe from the well to the pump is 20 ft and the only minor loss is that due to a sharp entrance? (Hint: you will need to use the flow rate for the pump you have chosen.) b) Series 80-SC Bell & Gossett 240 70 220 3500 R.P.M. 60 BO 60 140 50 40 120 100 80 30 Impelers are trimmed in incre required capacity 40Responsibility for final impeilor siz ing remains with Bel & Gossett. ments to I O 0 Date 3-12-82 0 0 i 00 120 140 I60 l80 CAPACITY IN U.S. GALLONS PER MINUTE lO i5 30 35

Answer 1

oSS L9 Sec o2k -S 41.34 SP oss 十minor nad lasi botol haad loss 2myov had l 29 O + 2.1 2x3 2

2 142-9 fle 9allon -449 em Oppvo x o. 82 peel o..sv 29 0 2.9 2x12.2 2x3), 2 y(%)