I. A. Abdullin
Kazan State Technological University, Kazan, Russian Federation
R. T. Galiaoutdinov
Scientific and Research Institute of Pumping Engineering Technology apart. 20, house 42, Gavrilova str., Kazan 420137, Russia
Nail F. Kashapov
Kazan Federal University, 18 Kremlevskaya Str., Kazan, 420008, Russia