# Water Hammer Maximum Surge Pressure for Fluid

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

## Water Hammer Maximum Surge Pressure for Fluid Formula

$$\large{ p_{spf} = \frac{ \alpha \; \Delta v_f \; \gamma_f }{ 144\; g } }$$
Symbol English Metric
$$\large{ p_{spf} }$$ = maximum surge pressure for fluid $$\large{\frac{lbf}{in^2}}$$ $$\large{Pa}$$
$$\large{ \Delta v }$$ = fluid velocity change $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$
$$\large{ g }$$ = gravitational acceleration $$\large{\frac{ft}{sec^2}}$$ $$\large{\frac{m}{s^2}}$$
$$\large{ \alpha }$$  (Greek symbol alpha) = pressure wave velocity $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$
$$\large{ \gamma_f }$$  (Greek symbol gamma) = unit weight of fluid $$\large{\frac{lbm}{ft^3}}$$ $$\large{\frac{N}{m^3}}$$