Interpretation and evaluation of monitoring results for main pipelines hydraulic pressure testing under non-isothermal conditions

The paper examines hydraulic pressure testing of main oil pipelines. The research objective is to identify and describe the characteristic features of pressure changes in pressure testing of the main pipeline, caused by temperature changes. The notions on the interpretation and evaluation of the results for pipeline pressure testing under non-isothermal conditions are given, the number of pressure sampling points and temperature information being limited; and considering the elevation difference along the length of the test section (where applicable). A formula for calculating the fresh water volumetric expansion coefficient correlation with temperature and pressure is proposed. A method for interpreting the hydraulic pressure testing results is developed, considering the parameters spread effect on the coefficients of the volumetric expansion and the modulus of elasticity for the test fluid, as well as the coefficients of linear expansion and Young’s modulus for pipe steel. The application of the method ...