Flow safety of crude oil pipeline YOYO system

When crude oil pipelines shut down for some reason, a YOYO system can be used between non-accident stations to make crude oil flow in round trips between stations to avoid coagulation accidents. The YOYO system consists of storage tanks and screw pumps respectively set up in two adjacent pumping stations. Its operation process is similar to forward and backward transmission technology, but the purposes are different. Workflow of the YOYO system is detailed, heat transfer mathematical models of its operation process are built and the initial conditions and height differences of forward and backward transmission are discussed. Based on a calculation case of pipe section, the temperature drop law of YOYO system during its running is discussed. The flow safety of oil pipeline with YOYO system is analyzed, and results indicate that the method is a potential safety measures for accidental pipeline.