Water flows from tank A whose level is at elevation 84.0' to tank B whose level is kept at elevation 60.0'. The tanks are connected by 100 ft of 12" pipe (f = XXXXXXXXXXfollowed by 100 ft of 6" pipe...

Water flows from tank A whose level is at elevation 84.0' to tank B whose level is kept at elevation 60.0'. The tanks are connected by 100 ft of 12" pipe (f = 0.020) followed by 100 ft of 6" pipe (f = 0.015). There are two 90° bends in each pipe (K = 0.50 each), K for the contraction is 0.75, and the 12" pipe projects into tank A. If the elevation at the sudden reduction of the pipes is 54.0', find the pressure heads in the 12" and in the 6" at this change in size.