Two-section cutting method of contamination in products pipeline by dynamic volume fraction judgment

During the batch transportation of products pipelines, adjacent batches will inevitably blend with each other. At present, the receiving of contamination plugs at receiving stations is often performed by means of constant-volume-fraction three-section cutting method, whose cutting volume fraction is more conservative, leading to more volume of contamination. In this paper, the cutting judgment method based on dynamic volume fraction was proposed by using the dilution effect of oil product quality potential sufficiently. In this method, the first and second judging volume fraction are calculated by using the volume fraction distribution curve of contamination receiving station, the maximum volume fraction of pipeline gasoline/ diesel mixture, and the effective volume of receiving tank, and they are taken as the criteria of two-section cutting and used to regress the mixing volume fraction distribution curve formula. And accordingly, the cutting volume fraction corresponding to the minimum contamination is obtained. By virtue of this method, the two-section cutting of contamination plug in the short pipeline is realized, the quality of oil products is controlled effectively, the cutting volume of contamination is reduced, the contamination disposal cost is cut down appropriately, and the building and operating expenses of contamination tanks are saved.