Optimization of Powerful Two-stage Screw Centrifugal Pump Oleg Baturin, Grigorii Popov, Daria Kolmakova, Vasilii Zubanov, Julia Novikova and Anastasia Korneeva MATEC Web Conf., 220 (2018) 03009 Published online: 29 October 2018 DOI: 10.1051/matecconf/201822003009