Simulation Study Of Super-high Building Fire Water Supply System Overpressure And Its Pressure Decrease Methods

For the research of overpressure phenomenon of fire hydrant system at early fireextinguishing stage, the model of a super-high building fire hydrant system was establishedwith Flowmaster, and dynamic simulations were made according to the different number ofopening fire hydrant.The main study in this paper are as follows:(1) Introduce the commonforms of high-rise、super-high building fire water supply system and the features of each;(2)Introduce the overpressure phenomenon of fire water supply system and some solvingmethods;(3) Introduce the mathematical theory of Flowmaster;(4) Re-development of firehydrant and sprinkler head with Flowmaster were made;(5) Dynamic simulations of the firehydrant system with common fire pump and analysis of the reason of overpressure weremade;(6) In order to test the effect of pressure reducing, dynamic simulations of the firehydrant system with pressure maintenance pump was made. Analyzing on the reasons of theexistence of overpressure and putting forward to the solving measures.Dynamic simulation results show that:(1)There is serious overpressure phenomenon in fire hydrant system with common firepump at early fire extinguishing stage.(2)The overpressure phenomenon of fire hydrant system with common fire pump is causedby the high fire pump head and small pipe hydraulic loss.(3)The use of pressure maintenance pump can solve system overpressure effectivelywhich is caused by high pump head.(4)The overpressure can not be solved totally by the only using of pressure maintenancepump, because of small pipe hydraulic loss.In order to prevent the overpressure phenomenon of fire hydrant system，the followingmeasures should be taken：Using pressure maintenance pump；increasing the number offloors in which pressure-reducing fire hydrant were used based on hydraulic calculation；decreasing system running time at low flow rate condition.