Well, I've never done ANY formal university-level courses in fluid mechanics. But I have spend 20 years working on coupled nonlinear fluid/mechanical/thermal problems (working together with CFD specialists) and I've interviewed a lot of graduate or postgraduate engineers looking for jobs - so I've come to my own conclusions about who is talking the most sense in this thread.I can't do anything else and I don't get paid for convince you. If I were in your company it would be different though.
IMO the practical thing to do here is not get into arguments about teminology or who wrote the best textbook, nor is it to start coding up formulas in a spreadsheet or Mathematica.
Why not go and buy some reputable professional software that does the calcs? If your company is so strapped for cash you can't pay a few hundred dollars for software, maybe it's time to start looking for another job.
Or http://www.efunda.com/formulae/fluids/calc_pipe_friction.cfm looks fairly credible to me. What it does is clearly documented, which is usually a good sign.