Speed 5 : The frequency at which a vibrating screen operates, usually expressed in RPM or CPM; the bowl rpm of a decanting centrifuge; the rotor rpm of a perforated cylinder centrifuge. (Bul 13C)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}