流水管網給水能力の実験的研究（第1報）金町地区放水実験

抄録

In order to ascertain discharging capacities for fire extinguishing purpose of the municipal water supplying nets, we performed 2 experiments besides one preliminary at one section of Kanamachi Katsushika-Ku, Tokyo.
Experiments were made to ascertain natural hose discharging and pump discharging capacities under the case of (1) single pipe line, (2) nets lines. We have computed the discharging amount of Q_c from the total friction loss of lines by using Darcy’s formula for old cast iron pipe, and compared with the values Q_o measured from experiments.
In these experiments mercury manometer was used at the coupling between hose and nozzle for the accurate measurement of Q_o.
We have found that in the 1st experiment the value mean of Q_o/Q_c is 0.31 and the 2nd is 0.40, that is the discharging capacity is about 30～40% of that for the case of cast iron pipe where Darcy’s formula was applied.