-- 作者： max123 -- 发布时间： 2005/02/02 00:09am http://www.pump-zone.com/pumpchat/showthreaded.php?Cat=&Number=419&page=3&view=collapsed&sb=5&o=&fpart=1 Q: i want to ask about the method of sizing the vent pipes of storage water tank A: You must know the maximum discharge flow from the tank and select an entering/leaving air hole whith very low differential pressure across it, pipe and mesh (if you see an API tank detail you will a "goose neck" for venting). A rule of thumb for API tanks is to do the venting hole one or two pipe size bigger than pump suction (i.e. if pump suction pipe is 8" a 10" "goose neck" should be enough)