A3.in. schedule 40 commercial steel pipe (with an actual inside diameter of 3.068 in.) carries 210of sae 40 crankcase oil at the rate of 6.0 gal/min. the oil specific gravity is 0.89, and the absolute viscosity is 6.6×10-7lb s/ft2. calculate the pipe size required to carry the same flowrate at approximately one-half the pressure drop of the 3-in. pipe. both pipes are horizontal.