Pigging Efficiency

Written by Jerry Ratzlaff on . Posted in Pipeline Pigging

Pigging efficiency, abbreviated as \(\eta_{pig}\) (Greek symbol eta), a dimensionless number, is expressed in percentage and always less than 100%.

 

Pigging Efficiency Formula

\(\large{ \eta_{pig} =  \frac { \left(\frac{ Q }{ \Delta p }\right)_{ap} \;-\; \left(\frac{ Q }{ \Delta p }\right)_{bp} }{ \left(\frac{ Q }{ \Delta p }\right)_{bp}  } 100 \% }\)  

Where:

 Units English Metric
\(\large{ \eta_{pig} }\)  (Greek symbol eta) = pigging efficiency \(\large{dimensionless}\)
\(\large{ ap }\) = after pigging (upstream suction pressure) \(\large{\frac{lbf}{in^2}}\) \(\large{Pa}\)
\(\large{ bp }\) = before pigging (upstream suction pressure) \(\large{\frac{lbf}{in^2}}\) \(\large{Pa}\)
\(\large{ \Delta p }\) = pressure differential \(\large{\frac{lbf}{in^2}}\) \(\large{Pa}\)
\(\large{ Q }\) = volumetric flow rate \(\large{\frac{ft^3}{sec}}\) \(\large{\frac{m^3}{s}}\)

 

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Tags: Efficiency Equations Pipeline Pigging Equations