September 2017, Vol. 17, No. 4 MANUFACTURING TECHNOLOGY ISSN 1213–2489 44 indexed on: http://www.scopus.com Axial Flow Pump Characteristics and Reliability Analyses at Different Frequency Rotation Mohammad Emal Qazizada, Elena Pivarčiová Technical University in Zvolen, Faculty of Environmental and Manufacturing Technology, Department of Machinery Control and Automation Technology, Masarykova 24, 960 53 Zvolen, Slovakia m.emalqazizada@yahoo.com, pivarciova@tuzvo.sk This paper focused on axial flow pump high operation, reliability, and long service life at different frequency of rotation (DFR). The efficiency of an axial pump varies considerably depending upon the conditions under which it must operate. This article concentrates methods related to the reliability analysis of pumping system operation by a frequency converter. Initially, it is focused to analyze the behavior of individual characteristic curves of the axial pump to find how can be applied for the determination of the most efficient frequency of rotation. Axial flow pumps are often controlled by adjusting their rotational speed, which affects the resulting flow rate and output pressure of the pumped fluid. In addition, the head and flow of fluid transported at different frequencies of rota- tion, to produce a map of reliability characteristic curves to verify the similarity rules for pumps recommendable operating region are discussed. The results showed that the recommendable operating region for a different revo- lution per minute of axial pump can be determined with efficiency. If the axial flow pump is driven outside its operating region, the efficiency decreases, and the reliability and long service life may be affected. Keywords: axial pump, reliability, characteristics, DFR Acknowledgments This paper was prepared within the work on a research project KEGA MŠ SR 003TU Z-4/2016: Research and educa- tion laboratory for robotics. References AHONEN, T. (2011) Monitoring of centrifugal pump operation by a frequency converter. Finland. ISSN: 1456– 4491 BIRD, R. H. (2005). Technical Information Axial Flow Pumps. Peerless Pump Company. Indianapolis, IN 46207- 7026, USA. Available in http://www.peerlessxnet.com/documents/tibs/TIB-20_AXIAL-FLOW-PUMPS.pdf BLOCH, H.P., ALLAN, R.B. (2010). Pump User’s Handbook. Life Extension 3rd Edition. Indian Trail. ISBN– 10: 0–88173–627–9 BENRA, F. K. (2013) Measurement of the characteristics of a centrifugal pump. Rhine–Ruhr. Available in https://www.uni–due.de/sm/Downloads/Praktika/ Centrifugal_Pump.pdf BLIŠT'AN, P. & PACAIOVA, H. (2011). Modelling environmental influence on the pipelines integrity. 11th In- ternational Multidisciplinary Scientific Geo conference and EXPO, Varna; Bulgaria 2011. Volume 2, pp. 645– 652. Code 101584 BOŽEK, P. (2008). Reliability control systems – methodology guide (in slovak). SP Synergia, Trnava, ISBN 978- 80-89291-14-4 CHALGHOUM, I. (2016). Transient behaviour of a centrifugal pump during starting period. Tunisia. Available in http://ac.els–cdn.com/S0003682X16300238/1–s2.0–S0003682X16300238–main.pdf?_tid= 0ce4b 116–1824– 11e6–99c8–00000aab0f01&acdnat=1463045559_ba8aef040e0a29877c1ea1fe568ac0d8 D & D MACHINE AND HYDRAULICS, INC. (2017). Axial flow pump. Fort Myers, Florida. Available in http://www.ddpumps.com/docs/D&D-axial-flow-pump.pdf FERMAN, R. (2015). The user’s role in pump reliability. Available in http://info.empoweringpumps.com/pump– reliability GRUNDFOS RESEARCH AND TECHNOLOGY, (2009). The centrifugal pump. Bjerringbro. Available from http://www.pdfdrive.net/the-centrifugal-pump-pdf-grundfos-e3017890.html HAIDARY, J. (2013) Manual: Chemical engineering laboratory. Kabul University Publisher KARASSIK, I. J. & MCGUIRE, T. (1998). Centrifugal Pumps. Second edition. Chapman & Hall, New York, USA