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6Seefeldt R, Crude oil tank cleaning in tank farms: A problem for the workplace and for environmental protection[J]. Staub-Reinhaltung der Luft ( ISSN 0039-0771 ) ,1993, 53 ( 12 ): 461-464.
7Jepsen E L, Cleaning tank interior with fluid jet, Toftegorg A/S, WO; 9950810; 9521033.
8Manabe N, Liquid jetting appts. For claening interior of oil tank, Taibo Ind Co Ltd, Furukawa Electric Co Ltd, EP; 94112; 0619148.
