# Water Hammer Maximum Surge Pressure for Water

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

## Water Hammer Maximum Surge Pressure for Water Formula

 $$\large{ p_{spw} = \frac { \alpha\; \Delta v_w } { 2.31\;g } }$$

### Where:

 Units English Metric $$\large{ p_{spw} }$$ = maximum surge pressure for water $$\large{\frac{lbf}{in^2}}$$ $$\large{Pa}$$ $$\large{ g }$$ = gravitational acceleration $$\large{\frac{ft}{sec^2}}$$ $$\large{\frac{m}{s^2}}$$ $$\large{ \alpha }$$  (Greek symbol alpha) = pressure wave velocity $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$ $$\large{ \Delta v_w }$$ = water velocity change $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$

### Solve for:

 $$\large{ g = \frac { \alpha \; \Delta v_w } { 2.31\; p_{spw} } }$$ $$\large{ \alpha = \frac { 2.31 \; p_{spw} \;g } { \Delta v_w } }$$ $$\large{ \Delta v_w = \frac { 2.31 \; p_{spw} \;g } { \alpha } }$$