Fire Safety Science Digital Archive

The projection of water spray on to an outdoor risk is most effective when the spray nozzles are placed as close as possible to the risk, without risk of damage to the nozzle system by a fire on the risk. The effect of wind on spray reaching the risk is also reduced by using nozzles delivering spray uniformly over the area covered. Nozzles with a hollow spray cover are less effective than nozzles with a peaked or uniform spray cover. Excessive wastage of water by projection beyond the risk being protected may be minimised by using spray nozzles of small cone angle.