Circular (Circumferential) Magnetization : Circular magnetization is the production of a magnetic field in a pipe wall or coupling such that the magnetic field is oriented circumferentially. (RP 5A5)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}