-- 作者： max123 -- 发布时间： 2005/02/01 11:59pm http://www.pump-zone.com/pumpchat/showthreaded.php?Cat=&Number=701&page=0&view=collapsed&sb=5&o=&vc=1 Question: Is there a calculation to determine at what level (in a tank or other type of vessel) vortexing will occur. This can be a problem when production decides to draw down as much out of the tank as possible Answer: ANSI/HI 9.8 - 1998, Section 9.8.7 gives the following equation for minimum submergence required to avoid vortexing. I think this equation holds good only for water. S = D + [(0.574Q)/(D^1.5)] Where S is minimum submergence required in inches D is suction bell diameter in inches Q is flowrate in USGPM. As far as my experienced is concerned this is a good equation.