Flange, Loose : A flange, as manufactured, not intended to be made integral with another piece of API Spec 6A equipment. They are blind, threaded, spacer, welding neck, and studded adapter flanges. (Spec 6A)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}