Hi,
I have calculated pressure loss across a reduction and would appreciate someone to proof read my calcs:
I have a pipe flow of 70m3/hr in a DN100 Pipe and need to install a device inline which is a DN50.
Using the formula under heading Permanent pressure drop for incompressible fluids in the link below, assuming Cd=1, I got a result of P1-P2=45969.79
http://en.wikipedia.org/wiki/Orific...an_orifice I redone the calculation using P1-P2=1/2.Rho. V2 and got a result P1-P2=49028.32
The results being more than 45 meters head loss across the reduction seems excessive. Can you please pass comments
Thanks