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## Main Question or Discussion Point

First, I am very confused as to the difference, if any, between head loss and pressure drop/loss. Can someone help me?

Also, I know that the Darcy-Weisbach equation for head loss due to friction is h

and you can plug that in to get an equation for delta p that is

dp=fL/D*pV

And this is dimensionally correct. My company says that for our applications all flow will be turbulent Re>4000 and the equation for the friction factor can be approximated to

f=(.0337*v

So my problem is, when I plug this into the equation for delta p I get an equation which is not dimensionally correct. Why? And what does it mean?

Also, I know that the Darcy-Weisbach equation for head loss due to friction is h

_{f}=fL/D*V^{2}/2gand you can plug that in to get an equation for delta p that is

dp=fL/D*pV

^{2}/2And this is dimensionally correct. My company says that for our applications all flow will be turbulent Re>4000 and the equation for the friction factor can be approximated to

f=(.0337*v

^{.25})/(V^{.25}*d^{.25}) Which Im assuming is from the Colebrook equation.So my problem is, when I plug this into the equation for delta p I get an equation which is not dimensionally correct. Why? And what does it mean?