Water Hammer Flow Velocity

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

Water Hammer Flow Velocity Formula

 $$\large{ v = \frac{ \left( p_{inc} \;-\; p_i \right) \; t }{ 0.070 \; l } }$$

Where:

 Units English Metric $$\large{ v }$$ = flow velocity $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$ $$\large{ p_i }$$ = inlet pressure $$\large{\frac{lbf}{in^2}}$$ $$\large{Pa}$$ $$\large{ p_{inc} }$$ = pressure increase $$\large{\frac{lbf}{in^2}}$$ $$\large{Pa}$$ $$\large{ l }$$ = upstream pipe length $$\large{ft}$$ $$\large{m}$$ $$\large{ t }$$ = valve closing time $$\large{sec}$$ $$\large{s}$$