This paper describes and analyzes the emulsion phenomenon of diesel in commissioning of Products Pipeline by Sinopec and PetroChina in recent years. Studies have shown that the ester anti-wear agent in diesel oil as well as the interface active substance contained in diesel are the emulsifiers of diesel and water, which cause the emulsification of diesel and water under strong shearing in pipeline. On the basis of this background, isentropic simulation experiment is carried out to obtain the emulsion in laboratory by creating a similar shearing stress. The basic properties of diesel, anti-wear properties and emulsion stability are studied, and the rate of water content, surface tension and droplet size are compared and analyzed. Then based on oil-water separation experiment, solutions to diesel emulsification, relevant experience and suggestions for the production of refined oil pipelines are put forward, which may be valuable reference for future commission of Products Pipeline.

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