Flex Element : Any of a variety of devices that permit relative angular movement of the riser or tendon in order to reduce bending stresses caused by vessel motions and environmental forces. (RP 2T)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}