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

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.

1. Yoganandh J., Natarajan S., Kumaresh Babu S. P. Erosive wear behavior of high-alloy cast iron and duplex stainless steel under mining conditions. Journal of Materials and Perfomance. 2015. Vol. 24(9). pp. 3588–3598.
2. Verichev S. N., Mishakin V. V., Nuzhdin N. A., Razov E. N. Experimental study of abrasive wear of structural materials under the high hydrostatic pressure. Ocean Engineering. 2015. Vol. 99. pp. 9–13.
3. Weihui Xu, Chuanchang Gao, Jun Liu, Weishu Wang. Hydraulic transient numerical study of superhigh parameter motor-pump in drainage system of mine emergency. Energy Procedia. 2011 2^nd International Conference on Advances in Energy Engineering (ICAEE). 2012. Vol. 14. pp. 464–469.
4. Yuanqiang Tan, Hao Zhang, Dongmin Yang, Shengqiang Jiang, Junhua Song, Yong Sheng. Numerical simulation of concrete pumping process and investigation of wear mechanism of the piping wall. Tribology International. 37th Leeds-Lyon Simposium on Tribology. Special issue: Tribology for Sustainability: Economic, Environmental, and Quality of Life. 2012. Vol. 46(1). pp. 137–144.
5. Ramkrishna Dandapat, Arghya Deb. A probability based model for the erosive wear of concrete by sediment bearing water. Wear. 2016. Vol. 350. pp. 166–181.
6. Olizarenko V. V., Dolganov A. V. Influence of mining-geological and technological factors on efficiency of mine drainage. Collection of reports of the 66-th scientific-technical conference. Magnitogorsk : Magnitogorsk State Technical University, 2008. Part 1. pp. 169–172.
7. Zaripov A. Kh. Assessment of energetic effectiveness of work of pumping plants and compressed airdelivery systems. Izvestiya vuzov. Gornyy Zhurnal. 2010. No. 4. pp. 74–77.
8. Dolganov A. V. Analisis of Energy Consumption the Ores Drainages Installation Were Carried out in the Field Copper and Sulfur Compounds South Ural. Gornoe oborudovanie i elektromekhanika. 2011. No. 2. pp. 39–41.
9. Aliev N. A., Isaev A. E., Ponomarenko M. V., Aliev P. N. Methods of increasing of longevity of barreltype mine pumps. Mechanical Engineering problems : collection of scientific proceedings. Donetsk : Donetsk National Technical University, 2006. pp. 317–327.
10. Dolganov A. V., Velikanov V. S., Savelev V. I. Experimental investigations of attrition of centrifugal pumps. Extraction, fi nal processing and use of natural stone : collection of scientific proceedings. Magnitogorsk : Magnitogorsk State Technical University, 2010. pp. 195–203.
11. Aleksandrov V. I., Gorelkin I. M. Hydraulic Calculation of Mine Water Pipeline System with Taking Into Account Head Losses on Transportation of Solid Particles. Gornoe oborudovanie i elektromekhanika. 2013. No. 7. pp. 44–47.
12. Teleguz E. N., Papayani F. A., Treyner N. B. Centrifugal pumps TsNSSh 300-140…800 for mine drainage. Ugol Ukrainy. 2004. No. 7(571). pp. 20–23.
13. Kosmin V. G., Patsera S. T., Protsiv V. V. Analysis of reasons of insuffi cient wear resistance of pump details for hydroabrasive mixtures. Modern innovation technologies of engineering stuff training for mining industry and transport. 2015. No. 1(2). pp. 83–89.
14. Maleev V. B., Morgunov V. M., Martsis T. V. Determination of significant factors, making an influence on efficiency of mine drainage operation. Naukovi pratsi Donetskogo natsionalnogo tekhnichnogo universitetu. Seriya girnicho-elektromekhanichna. 2013. No. 1 (25). pp. 104–118.
15. Morgunov V. M., Martsis T. V. Substantiation of parameters and development of technical measures for the reduction of costs on mine drainage. Naukovi pratsi Donetskogo natsionalnogo tekhnichnogo universitetu. Seriya girnicho-elektromekhanichna. 2013. No. 2 (26). pp. 183–189.
16. Ponomarenko M. V., Aliev N. A., Kononenko A. P. Cleaning of underground water-collectors from slime. Mechanics of liquid and gas : materials of the IV international scientific-technical student conference. Donetsk : Donetsk State Technical University, 2005. pp. 146–149.
17. Dolganov A. V. Slurry of coppes and pyrites pits: problems and ways of decision. Gornyy informatsionno-analiticheskiy byulleten. 2013. No. 4. pp. 10–14.
18. Ovchinnikov N. P., Sukhanov D. K. Experience ofexploitation of pumps of the Central Pump Station (K) of kimberlite mines. I, II international conference “Technical sciences — from theory to practice”: collection of scientific reports. Saint Petersburg : Scientific journal “Globus”, 2015. pp. 17–19.
19. State Standard GOST 6134-2007. Dynamic pumps. Method of testings. Moscow : Standartinform, 2008. 101 p. (in Russian)
20. State Standard GOST ISO 10816-1-1997. Mechanical vibration. Evaluation of machine vibration by measurements on non-rotating parts. Part 1. General guidelines. Moscow : Izdatelstvo standartov, 1998. 29 p. (in Russian)
21. State Standard GOST R ISO 18434-1-2013. Condition Monitoring And Diagnostics Of Machines — Thermograph — Part 1: General Procedures. Moscow : Standartinform, 2013. 39 p. (in Russian)
22. Batsezhev Yu. G., Kostyuk V. S. Electric drive and power supply : tutorial for universities. Moscow : Nedra, 1989. 292 p.
23. Aliev N. A. Vibration diagnostics of the barrel-type pumps with the forecasted distribution of unbalanced rotor mass. Naukovi pratsi Donetskogo natsionalnogo tekhnichnogo universitetu. Seriya girnicho-elektromekhanichna. 2004. No. 83. pp. 225–234. (in Ukrainian)
24. Aliev N. A. Vibration monitoring of mine pump units. Ugol Ukrainy. 2005. No. 5. pp. 33–36.
25. Shulzhenko N. G., Efremov Yu. G., Gontarovskiy P. P. Means of vibration diagnostics, asessment of thermal resistance and resource of energetic and transport equipment. Vibratsiya mashin: izmerenie, snizhenie, zashchita. 2012. No. 3. pp. 40–43.
26. Menshikov S. S. Hydrotransport slurry pumps parametrical diagnostics methods. Obogashchenie Rud. 2012. No. 2. pp. 37–39.
27. Centrifugal console pumps K8/18, K20/30 and electric-pump aggregates on theirbasis. Exploitation guidance. N49.888.000 RE. Available at: http://motor-electro.ru/files/K8.pdf (accessed: 26.01.2016). (in Russian)
28. Vlasov A. B., Mukhin E. A. Method of calculation of temperature of amature windings of electric machine on the basis of quantitative thermography. Vestnik Murmanskogo gosudarstvennogo tekhnicheskogo universiteta. 2012. No. 4. Vol. 14. pp. 671–680.