Question: A horizontal pipeline system, composed of 6-in. ID pipe, carries cooling water at about WF for a lean oil cooler and a product cooler. The product cooler needs much less cooling water than does the lean oil cooler. (Lengths given are equivalent lengths; that is, they include bends, fittings, etc.) Outlets exist at points 3 (lean oil cooler) and 5 (product cooler) and the outlet pressures may both be taken to be 0 psig. The inlet is supplied by a pump capable of maintaining a 30-psig pressure. It has become necessary to increase the flow supplied at point 3, with less flow required at point 5. If a 6-in. line is installed from point 4 to point 3, as indicated, what will be the flow rate in this branch? Assume f - 0.015 over the entire system
