I just started hydraulics and this is the first problem I'm trying to solve. Please take that into consideration! 1. The problem statement, all variables and given/known data Given Two Pipes Water is 50 degrees Celsius http://img31.imageshack.us/img31/9752/74467684.jpg [Broken] I wanna see if I understand this stuff correctly. YL = The pressure lost through both pipes L - Length of pipe ID - Inner diameter [ I'm not entirely sure what eA and eB mean - I think it says something about the quality of the surface? How smooth it is?] 3. The attempt at a solution So I got these three formulas http://img11.imageshack.us/img11/963/yyyyyyj.jpg [Broken] I'm looking at my class notes and I got a few things missing. Ra and Rb are "Reynolds" number for the pipes, yes? I imagine it's constant. And the strange symbol at the bottom of Reynolds formula, that misshapen "V", that is a constant as well, yes? I hope it turns out there are only these equations. It seems like a fairly simple problem.