This study compares and analyzes the differences between Chinese and American fire water supply systems,and delves into the underlying reasons for the static pressure zoning regula-tions at fire hydrant outlets in the Technical code for fire water supply and hydrant systems(GB 50974-2014).Using case analysis method,the pressure variations at the lowest fire hydrant out-lets in fire water supply systems under different building heights and system configurations were investigated.Results show that:the 1.0 MPa limit for static pressure at fire hydrant outlets may lead to overpressure damage risks in temporary high-pressure systems under certain circumstances;the regulation that sets the design pressure of pressure stabilizing pumps in temporary high-pres-sure fire water supply systems as the fire pump's zero-flow head plus 0.10 MPa is unreasonable.Based on these findings,improvements to the criteria for fire hydrant system zoning and reevalu-ation of the set values for pressure stabilizing pump design pressure are proposed.
Fire hydrant systemStatic pressure at fire hydrant outletPressure stabilizing pump design pressureNFPA
NETL
NSTL
万方数据
