Studies On Optimizing Design Of Hydrant Ringed Water Supply Inside Buiklings

Fire protection of buildings is the most important of buildings water supply and drainage engineering design. Fire hydrant system is the basic and extensively adopted technique of buildings fire protection at present in our country. 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.This paper studied and summarized the water supply mode based on the research of characteristic and constitution of fire hydrant system. The paper gave 10 basic modes of water supply according to vertical division block and the key equipment in the block division, 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 disputing system of steady high pressure water supply, and pointed out the possibility and necessity of classifying this system out from temporary high pressure and constant high pressure water supply system, and listed modes of steady high pressure water supply system.This paper discussed the modality of ringed piping 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 and that diameters of hydrant ringed piping should be ensured after calculation. On this base, the paper gave a new way of hydraulic calculation according to the ringed hydrant piping characteristic that there is one region of fire at same time and there is one sprinkle region of hydrant system in the buildings. This method used FEM to build mathematic model. 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 inside and outside of water supply piping calculation and It is excel Hardy Cross-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 diameters value calculated in theory of hydrant ringed piping is less than the value of manual. So it is recommended that the conclusion should be accepted by <> and <> .