Water Hammer Pressure Increase

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

Water Hammer Pressure Increase Formula

\(\large{ p_{inc} =   \frac { 0.070 \;v \;l  }   { t  } + p_i  }\)   

Where:

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

Solve For:

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

 

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Tags: Pressure Equations Water Hammer Equations