1) the condition of spray system, the power and lift of pump( make sure the rated pressure), the total flow rate of spray system( make sure the rated flow rate), pressure drop value design by pipe system （make sure the actual working pressure）

2)spray condition, spray angle ( make sure the nozzle qty and distance),spray pattern( make sure flow rate distribution feature). drop size(make sure the spray effect), flow rate( depend on the nozzle orific size and shape)

3) effect condistion,spray pressrue( make sure the nozzle construction and flow speed), impact( make sure the cleaning effect of nozzle, anti impact( make sure the pipe type and break force)

4) media ：density,viscous force,surface tension(make sure the using effect of spray), temperature，pH value