The Dynamic Simulation In Hydrant Ringed Water Supply

Fire protection of buildings is the most important of buildings water supply and drainage engineering design. Now, fire hydrant system is the basic and extensively adopted technique of buildings fire protection. We have been used to calculate the diameter of ringed piping according to ramiform piping in project practice, then it result factitious error.This paper studied and summarized the water supply mode based on the research of characteristic and constitution of fire hydrant system, and it also discuss the performance of every mode. The modes can be expanded and fit together in the practice of engineering according to the difference of buildings' construction. Besides, the paper analyzed the cause of the overpressure problems of firefighting water supplying system, and effectual measures prevented the overpressure problems were proposed according to experiences.This paper discussed the real modality of hydrant ringed water supply in the procedure of fire fighting. It figured out that there was flow of water not only in the calculated pipeline but also in other pipelines. On this base, the paper gave a way of hydraulic calculation according to the ringed hydrant piping characteristic. This method used FEM to build mathematic mode. It is more accurate than traditional method at the aspect of calculating head loss, pipe flow and node pressure of hydrant. This mathematic model can also be used in the in side and outside of water supply piping calculation. A calculation program is made and an accurate convenient software is offered to engineering design.Analyzed the outcome of an engineering practice calculation, the real velocity of flow in the least diameters of manual is less than the best velocity of flow, so the diameters values can be minished.