# Pigging Efficiency

Pigging efficiency, abbreviated as \(\eta_{pig}\) (Greek symbol eta), 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:

\(\large{ \eta_{pig} }\) (Greek symbol eta) = pigging efficiency

\(\large{ ap }\) = after pigging

\(\large{ bp }\) = before pigging

\(\large{ \Delta p }\) = pressure differential

\(\large{ Q }\) = volumetric flow rate

Tags: Equations for Efficiency Equations for Pipeline Pigging