DETERMINATION OF THE CAPACITY OF PIPELINES TRANSPORTING LIQUID PRODUCTS, DEPENDING ON THE THERMOBARIC CONDITIONS

Abstract

The article discusses the issues of calculating the capacity of pipelines through which liquid hydrocarbon products are transported, depending on thermobaric conditions. These calculations are important for such urgent tasks of pipeline transport practice as carrying out an inventory and establishing the fact of illegal withdrawal of oil/oil products from the pipeline. The work provides a fundamental equation of the state of the stopped pipeline, in consideration of which the focus of attention is on changing the geometric capacity of the pipeline depending on the change in temperature and pressure of the pumped medium. When considering the change in volume, from the classical equations of mechanics, refined dependencies were obtained for two cases: underground and above-ground laying. A comparison of the obtained relationships has been made, in which it has been found that a number of effects such as a change in gas volume and a temperature factor «mask» the effect of leakage/illegal sampling, preventing their identification from the pressure/temperature change data. An analytical explanation of the processes occurring in the shut down pipeline will allow further quantification of the uncertainties that arise, which will facilitate the decision and allow adjustments to be made to the software used.