Improving power efficiency of underloaded pipelines with variable frequency drives

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Published Mar 31, 2020
Pavel. A. Revel-Muroz Georgy N. Matveev Leonid M. Bekker Konstantin Y. Shtukaturov

Abstract

The paper considers the option to reduce power consumption in the operation of the underloaded trunk pipeline by engaging additional pump units with lower rotor r.p.m. control using variable frequency drive. Under these conditions, the operating point of the pumps (delivery rate, head) approaches to the rated output, thus increasing the efficiency of the pumps and decreasing the electricity power consumption for pumping operations. The paper presents comparative calculations of operating conditions for a section of the trunk pipeline with a specified pumping capacity of 35 million t/year (60 % of the design load) when one, two and three main line pumps with variable frequency drives are engaged. The power consumption for pumping is calculated using the dependence of the variable frequency drive and motor efficiencies on the electric motor load and rotational speed. Based on the results of calculations, the electric energy saving is determined when additional pumping units are engaged. The experience has shown that when the second main line pump was engaged, the electric energy saving for pumping was 3.7% compared to the condition with one pump running. However, if the third pump is engaged, the saving is only 1.9 % – the decrease is due to lower motor and variable frequency drive efficiencies in the underloaded condition.

How to Cite

1.
Revel-Muroz PA, Matveev GN, Bekker LM, Shtukaturov KY. Improving power efficiency of underloaded pipelines with variable frequency drives. PST [Internet]. 2020Mar.31 [cited 2020Jul.8];4(1(3):4-. Available from: https://pipeline-science.com/index.php/PST/article/view/111

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Keywords

power efficiency improving, trunk pipeline, variable frequency drive, energy saving, main line pump, booster station

References
[1] Mikhailov А. V. Effectiveness of using various types of pumping units in conditions of reduced performance of oil trunk pipelines [dissertation abstract]. Ufa: USPTU Publ.; 1999. 24 p. (In Russ.)
[2] Gumerov A. G., Kolpakov L. G., Bazhaikin S. G., Vekshteyn M. G. Centrifugal pumps used in the systems for oil collection, preparation and pipeline transmission. Мoscow: Nedra Publ.; 1999. 295 p. (In Russ.)
[3] Gubin V. E., Gubin V. V. Oil and oil products pipeline transportation. Мoscow: Nedra Publ.; 1982. 296 p. (In Russ.)
[4] Mikhailov D. A., Golianov A. I. On the head distribution of pumping stations equipped with pumping units with variable frequency drive. Transport and Storage of Oil Products and Hydrocarbons. 2011(1):6–8. (In Russ.)
Section
Original Work