Cubage calculation and installation piping of expansion tanks

Analyses the problems of an existed formula and provides another formula. Discusses the relations between minimum setting height and the system style, the connection position,and the influence of the connection position of expansion pipe and circulating pipe on the water circulation. Points out that the distance between these pipes and their diameter can be decreased in the case of high rise buildings. Presents the position of the constant pressure point for the system with both expansion pipe and circulating pipe.