Water Hammer Upstream Pipe Length

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Water Hammer Upstream Pipe Length Formula

\(\large{ l =   \frac{ \left( p_{inc} \;-\; p_i  \; \right) \; t }{ 0.070 \; v }  }\)     (Water Hammer Upstream Pipe Length)

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

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

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

\(\large{ v =   \frac{ t }{ 0.070 } \; \frac{ 1 }{ l \;  \left( p_{inc} \;-\; p_i  \; \right) }  }\)

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

 

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Tags: Water Hammer