Minimum Bend Radius : The minimum radius (R) that a pipe with a tube OD (D) can be bend around and remain in the elastic region. R= E(D/2)/Sy. (R is in inches). E=30x106psi
George E. King Engineering, 5000 Oilfield Terms: A Glossary of Petroleum Engineering Terms, Abbreviations and Acronyms, US 2010. http://gekengineering.com/Downloads/Free_Downloads /Glossary_of_Petroleum_Engineering_Terms_25_August _2010.pdf, (Oil - Amer) {593}