Underflow Header : (See Related Term: Underflow Manifold.) A pipe, tube, or conduit into which two or more hydrocyclones discharge their underflow. (Bul 13C)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}