Research on the Overall Heat Transfer Coefficients of Crude Oil Pipeline and Product Pipeline Laid in One Ditch

Abstract

Crude oil pipelines and product pipelines laid in one ditch is a new construction technology, which not only saves construction costs but protects the environment. Overall heat transfer coefficients of the crude oil pipeline and product pipeline laid in one ditch are important parameters that are used to calculate the oil temperature along the pipeline and influence the design and operation of the whole pipeline. Formulas regarding soil temperature field, heat emission coefficient between the pipeline and the soil, as well as overall heat coefficients of the crude oil pipeline and product pipeline laid in one ditch are deduced by conformal mapping. Then the oil temperatures along the pipeline are calculated. Comparing the temperatures for double-pipeline and single-pipeline conditions, the results calculated by the overall heat transfer coefficient formulas with pipelines laid in one ditch are more accurate than those with a single pipeline.