We have been used to calculate the diameter of ringed piping according to ramiform piping, then it result in the bigger diameter and wasting of investment.
长期以来，习惯环状管网管径按枝状管网计算，管径偏大，造成浪费。
2
According to action principle, extinguishing process and efficiency of the sprinkler systems, it is put forward that the ringed arrangements replace the ramiform arrangements.