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 根据自喷系统的作用原理、灭火过程和效率，提出用环状管网代替目前广泛采用的枝状管网的观点。
3.
In our country , sprinkler systems always adopt ramiform arrangements . because its ' security and reliability is low , it ' s necessary to study on ringed arrangements and hydraulic calculation of the sprinkler systems 在我国，自动喷水灭火系统管网一直采用枝状布置，安全性与可靠性低，曾出现火灾发生后自喷系统不能有效灭火的现象。
4.
Then hydraulic calculation of the most disadvantageous district in ramiform pipe system is carried out . the influences of different design forms on the choice of piping diameter and fire pumps are also discussed 针对枝状管道系统，对满足条件的几种最不利区域形式进行了水力计算，讨论了这几种不同选择形式对系统管道管径的确定和水泵选择的影响。
5.
On the basis of the sprinkler systems " ringed arrangements , fem is used to build mathematic model of sprinkler systems . the mathematic model applies to both the ringer arrangements and the ramiform arrangements . vb6 . 0 is used to compile caculation program , and a practical engineering use it to caculate 在自喷系统环状布置的基础上，采用有限单元法建立了同时适用与枝状管网和环状管网的自喷系统水力计算的数学模型，采用vb6 . 0编写计算程序，并用该程序对一示例工程进行实际应用。
