The main pipe layout of a water distribution system is shown in Fig XXXXXXXXXXThe water demand for the system (domestic + fire) is 2,300 gpm and is supplied at point A. At point I, the most...

The main pipe layout of a water distribution system is shown in Fig. 6.27. The water demand for the system (domestic + fire) is 2,300 gpm and is supplied at point A. At point I, the most unfavorable as far as loss of head is concerned, it is assumed that a fire plus the domestic flow requires 900 gpm. At other intersection points it is estimated that the amounts shown will be required to satisfy the normal domestic demand. The elevations at intersections of mains are as follows:

(a) Determine the required diameters of pipes AB, BC, CF, and FG, assuming that the maximum, allowable head loss in the system is 2‰. (Hint: Use sections aa, bb, cc, and dd in your analysis.)

(b) What is the minimum possible pressure at point I? Is it acceptable? Assume that a pressure of 30 psi is available at point A.