Vol. 7 № 2, 2017 p 56-65

Pages

Article name, authors, abstract and keyword

56-65

Analysis of changes in transient processes occurring in the main pipeline as a result of anti-turbulence additive injection

Vladimir V. Zholobov a, Dmitry I. Varybok a, Denis V. Egorov a

a Pipeline Transport Institute, LLC (Transneft R&D, LLC), 47a, Sevastopolskiy prospect, Moscow, 117186, Russian Federation

https://doi.org/10.28999/2541-9595-2017-7-2-56-65

Abstract: A water hammer phenomenon occurs at a rapid change in the flow rate of transported media. An impact wave generated at the flow rate change point is spread along the pipeline, interacts with the equipment and damps according to a certain law. The numeric parametric calculations of wave processes to construct diagrams of the maximum pressure take much time and effort. The sufficient data volume obtained during the numeric calculation with differential diagrams mostly is not used. The purpose of this work is to find an analytical way to built maximum pressure envelope.
The implementation of the fluid movement mode is stipulated at the generation stage after the impact wave, if the initial mode is arbitrary. It is established that the pressure drop amplitude damping task has an apparent new analytical solution in low compressed elastic medium.
The parametric analysis has shown that this solution is more advantageous with an arbitrary combination of mode before and after the impact wave, if compared with available functions in terms of accuracy of the wave amplitude representation. Moreover, it makes it possible to obtain a methods and formulae of a mutual re-calculation of parameters of the wave in medium, either containing anti-turbulence additives (ATA) or not. A parametric analysis of ATA impact of the water hammer wave amplitude is carried out on the basis of these formulae. It is proved that the intensity of wave processes in media with ATA is higher with other conditions being equal. The circumstance dictates the necessity to adjust the protections for such media. There is built an approximate analytical function for pressure distribution after the pressure drop. Combining it with the ratio for the wave amplitude and the recalculation formulae enables analytical building the maximum pressure envelope. When making numerous parametric calculations, the application of the approach presented provides exclusion on the basis of a preliminary analysis of many options, which are of no interest in the field of safe operation of pipelines.

Keywords: wave amplitude, impact pressure, damping, additive, analytical solution, recalculation formulae

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