Flux Leakage 2 : This is the magnetic field forced out into the air by the distortion of the field within the pipe caused by the presence of a discontinuity. (RP 5A5)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}