Experimental study of transient processes in oil pipeline caused by startups of pumping units
DOI:
https://doi.org/10.15587/1729-4061.2016.77190Keywords:
unstable hydrodynamic process, an abrupt pressure change, pressure wave damping factorAbstract
The patterns of pressure changes during transients caused by running the pumping unit were determined with the help of processed industrial data after experiments carried out on the main oil pipeline “Druzhba”.
It was found out, that the actual value of abruptly changing pressure both on the inlet and outlet of the oil pumping station is 15–23 % less than the theoretically expected value, in particular, half the pressure which is created by the pump started.
The actual pressure overload of the linear part of the oil pipeline, caused by running the pumping unit, was analyzed. The exponential dependencies of an abrupt oil pressure change on the distance to the origin of the disturbance were developed. The intensity of damping of high and low pressure waves of the transported oil in the pipeline was assessed.
For the oil pipeline, on which the experiments were carried out, the analytical relation was proposed to calculate a coefficient of pressure wave damping as a function of oil flow rate and the Reynolds number in the oil pipeline before the beginning of the transient caused by running the pumping unit. It was determined that the damping coefficients of increased and decreased pressure waves are almost the same for a specific transitional mode of operation of the pipeline.
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