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Evaluation of dependability indicators of NK, NKV and NPS type pumps

https://doi.org/10.21683/1729-2646-2016-16-4-11-16

Abstract

One of the strategic areas of development of all oil refineries (OR) in the Russian Federation is the improvement of equipment dependability and safety. The regulatory framework often does not take into consideration the design features of devices which, on the one hand, standardizes the service conditions, but, on the other hand, may cause inefficient maintenance of individual types of equipment. Due to the unpreparedness of the Russian oil refining complex to migration from scheduled preventive maintenance to condition-based maintenance, a large number of obsolete equipment and unceasing growth of technology complexity in modern ORs, it is required to improve and update the statistical and analytical base of dependability indicators of the equipment in operation. Russian and foreign experience of OR operation shows that damaged OR pump equipment can cause significant material damage and human casualties. A fair share of faults and failures that can cause accidents in ORs is concentrated in pump and compressor facilities. Ensuring safety of equipment operation and ORs as a whole requires reducing the probability of accidents. To that effect, technical condition monitoring facilities are deployed and equipment diagnostics are performed. A priori information analysis is also an option.

Results. The article presents the results of documental inspection of performed maintenance of NK, NKV and NPS type pumps of a Russian OR conducted for the purpose of improving dependability and safety of pump operation. Probabilistic and statistical methods were used. The article presents an analysis of dependability indicators based on Gomertz-Makeham parametric distribution. This distribution is widely used in survival analysis and characterizes both system deterioration, and the influence of factors that do not depend on operation time. The authors analyze maintenance operations and repair cycles, identify the least dependable pump components and most frequent repair operations, show the influence of total operation time on pump dependability indicators. For the inspected pumps, the availability factors, utilization factors and average time between maintenance have been defined. The analysis identified that the availability factor of pumps depends not only on the average time between maintenance (that in turn depends on the frequency of required maintenance), but also on the utilization factor of the pumps. Beside the conventional dependability indicators, i.e probability of no-failure and failure rate, based on pump failure rate analysis ultimate times to failure for the inspected pumps were identified. Ultimate time to failure is the operation time beyond which gradual deterioration process significantly accelerates and causes a growth of the number and/or quality of partial failures. A significant accumulation of partial failures results in the loss of function or destruction of equipment. This dependability indicator is the most important in insuring the normal operation from the point of view of operating services.

Conclusions. The article shows taht the identification of the ultimate time to failure for improved dependability and reliability of equipment operation must involve regular updates of input data in order to identify the beginning of the process of equipment “aging” for prevention of accidents caused by out-of-limit tear and wear of equipment.

About the Authors

I. R. Baykov
Ufa State Petroleum Technological University
Russian Federation

Doctor of Engineering, Head of Department of Industrial Thermal Power Engineering;

Professor, Director General of ANO CE RB,

Ufa



S. V. Kitaev
Ufa State Petroleum Technological University
Russian Federation

Doctor of Engineering, Professor of the Department of Transportation and Storage of Oil and Gas, 

Ufa



Sh. Z. Fayrushin
Ufa State Petroleum Technological University
Russian Federation

Postgraduate,

Republic of Bashkortostan , Ufa 



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Baykov I.R., Kitaev S.V., Fayrushin Sh.Z. Evaluation of dependability indicators of NK, NKV and NPS type pumps. Dependability. 2016;16(4):11-16. https://doi.org/10.21683/1729-2646-2016-16-4-11-16

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ISSN 1729-2646 (Print)
ISSN 2500-3909 (Online)