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CONTRIBUTION OF THE NORTH-EASTERN FEDERAL UNIVERSITY TO DEVELOPMENT IN THE MINERAL MINING INDUSTRY AND PERSONNEL TRAINING
EQUIPMENT AND MATERIALS
ArticleName Experimental studies of operating properties of pumping unit with worn impeller
DOI 10.17580/gzh.2016.09.17
ArticleAuthor Ovchinnikov N. P., Vikulov M. A., Bochkarev Yu. S., Dovidenko G. P.
ArticleAuthorData

Mining Institute, Ammosov North-Eastern Federal University, Yakutsk, Russia:

N. P. Ovchinnikov, Associate Professor, Candidate of Engineering Sciences, ovchinnlar1986@mail.ru
M. A. Vikulov, Head of a Chair, Doctor Engineering Sciences
Yu. S. Bochkarev, Senior Lecturer
G. P. Dovidenko, Associate Professor, Candidate of Engineering Sciences

Abstract

One of the methods of necessity to ensure efficiency and reliability of mine dewatering plants when working in abnormal operating conditions is the reduction in their standard overhaul time, which is actively used, for example, in mines of the Urals and Yakutia. In copper–pyrite mines of the Southern Ural, the overhaul time of multi-section pumps is 248–1000 hours, and in kimberlite mines of the Western Yakutia, the overhaul repair of multi-section pumps is carried out every 248–1000 hours at the general standard of 6500 hours. Despite the reduction the turnaround periods, impellers of multi-section pumps in the process of pumping of saline waters pregnant with mechanical impurities lose approximately 3 to 10 % of initial weight, depending on the sequential number of the wheel in the shaft pattern, which can lead to the shift of the electric pump mode off the optimum range of the pressure curve and induce rotor imbalance or other signifi cant problems. Thus, experimental research of efficiency of a pumping unit with an impeller with reduced metal content by 3–10% of its initial condition due to wear is an urgent scientific task. The full-scale experiment was conducted on a laboratory plant equipped with cradle-mounted pump K8/18 in 2 stages. The first stage was the measurement of operating parameters (pressure at the inlet, greenshanks and outlet of the pump; the pump fl ow; the rotational speed of the electric motor; the capacity of three phases), RMS value of vibration velocity and temperature at the test points during operation of the pump with a new impeller 1.008 kg in weight. The second stage was the measurement of the above characteristics during operation of the pump with the worn impeller 0.952 kg in weight, i.e., with the reduced metal content by 5.5% as against the new impeller. The experiment was carried out in accordance with the state standards GOST 6134-2007, GOST ISO 10816-1-1997 and GOST R 18434-1-2013. The results of the experiment have shown that in case of the reduced metal content of the impeller of pump K8/18 by 5.5% relative to the original condition:
– the pump flow has decreased by 3.9%, the full dynamic pressure pump — by 4.3%, the required power —by 1.3%;
– the RMS values of vibration velocities at the vibration measurement points have increased 1.1–1.5 times;
– the temperature at the control points has increased by 7.2–34.3%, depending on the sequential number of the control point.

keywords Pump, wear, impeller, operating properties, laboratory plant, operating parameters, vibration, temperature
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