Line Pressure Drop

[Kam999]

Just wanted to confirm if a simple ratio ( old delta p / new delta p ) can be used to prorate the pressure drop in a line for a new flowrate.

new dp = ( Q2 / Q1 ) * old dp.

Thanks

 

[kcj]

No, only the electrical people have it so easy as straight linear relationship.

Most hydraulics and water piping is turbulent, and pressure drop is very roughly flow squared. i.e. 2 x flow = (2)^2 = 4 times pressure drop. 3xflow = 9x pressure drop.