Transportation of oil and petroleum products through main pipelines (MP) is accompanied by water accumulations (WA) formation. The most technological method of removing WA is by pumping the flow of oil/petroleum products. Several methods are known for predicting the flow rate, ensuring the beginning of simultaneous removal of the entire volume of WA. The proposed calculation formulas have either not been confirmed experimentally, or were acquired as a result of processing experimental data obtained on tubes of small diameter. The article describes the formula obtained in The Pipeline Transport Institute LLC, as a result of modeling the removal of WA from pipelines up to 1200 mm in diameter and successfully tested experimentally on the MP. The results of comparing the error in calculating the outrigger velocity according to this formula and the dependencies proposed by various authors are presented. New methodology, developed by The Pipeline Transport Institute LLC, enables to identify the locations of WA at a given pumping rate and properties of the pumped liquid, to assess the volume of WA and the additional energy consumption for pumping. An analysis of the operation of all the Transneft’s PJSC MPs was carried out. The sites of increased corrosion hazard of MPs were identified, recommendations given on the choice of a method for cleaning from WA. The article provides an example of the profile study of a technological section of one of the MPs for the location and size of WA at various flow rates and viscosity of the pumped oil.
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