Yea, this is probably one of my most used tables when I have a fluids problem. It allows me to go back and forth between gpm and ft3/min in about a second by just looking up the pipe size from the table. I thought the same thing that it might account for Darcy friction factors, but I dont think it does. I tried it yesterday taking the pressure drop, scaling it to the length of pipe that was given in the problem, converting it to a head loss and comparing it to what I calculated manually. It didnt work, but maybe I just made a mistake somewhere. Calculating the friction factor isnt hard, but it requires calculating the reynolds number which requires you to look up the kinematic viscosity or absolute viscosity and density which can be a time waster.
Oh on another note, besides bringing a second book that has a table of Prandtl numbers, is it listed in a table in the book somewhere for various fluids other than water? For some reason the sample exams like to use liquid sodium.