Theoretical Analysis of Impedance Coefficient of D40 Polyurethane Lined Fire Hose
Aiming at the impedance coefficient which is an important parameter that affects the application of D40 polyurethane lined fire hose,this paper proposes a simple and feasible impedance coefficient theoretical analysis method based on classical fluid mechanics theory and fire water supply theory,and obtains the conclusions:the impedance coefficient theoretical values of 0.315 and 0.473 for commonly used 20 m and 30 m D40 PU water hoses;when TL20-B-4DS vertical high-pressure portable fire pump and QLD6.0/4 DC spray water gun are used to connect D40 PU hose for fire extinguishing,the maximum water supply distance is about 500 m and the maximum water supply height is about 100 m under rated pressure and rated flow.This paper points out that the theoretical parameter and its application have positive practical significance in guiding grassroots fire rescue teams to correctly use D40 PU water hoses for fire water supply and firefighting rescue work.
fire hosepolyurethaneresistance factortheoretical analysis
万方数据
维普
