Pigging Efficiency

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

 

Pigging Efficiency Formula
\(\large{ \eta_{pig} =  \frac { \left(\frac{ Q }{ \Delta p }\right)_{ap} \;-\; \left(\frac{ Q }{ \Delta p }\right)_{bp} }{ \left(\frac{ Q }{ \Delta p }\right)_{bp}  } \;100 }\)
Symbol	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	\(\large{\frac{ft^3}{sec}}\)	\(\large{\frac{m^3}{s}}\)