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    Development of Process Control Charts ( and R) for Evaluating Performance of 8004 Fan Nozzles

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    Fan nozzles are very popular for spray applications. Problems can arise, however, from the use of worn out nozzles. An example would be the over-application of the chemicals. The objective of this study was to develop and R process control charts for evaluating the performance of 8004 brass fan nozzles. The nozzle was considered to be worn out when its flow rate exceeded 110% of the nominal flow rate at the selected nozzle pressure (1692 ml/min @ 347.5 kPa). Water was used in all the trials. Twelve 8004 fan nozzles were used in this study. The flow rate from each nozzle was measured as a function of time in hours. The nozzles began to wear at 398.05 hours. All the nozzles had worn out after 591.2 hours. and R charts were developed for each nozzle. A typical plot is shown. Plots of the sample grand average (), average sample range (t) and system range (Rs) values of the flow rate of 8004 fan nozzles at specific lifetime are shown. Rs values indicate that the control must be based on control charts for each individual nozzle on the boom. This is unfortunate from an economic point of view because it requires more measurements and is more expensive than controlling the whole system as one unit.


    nozzle wear, nozzle evaluation

    Author Information:

    Krishnan, P
    Associate Professor, University of Delaware, Newark, DE

    Seemans, D
    Former undergraduate student, University of Delaware, Newark, DE

    Gottfried, S
    Research Associate I, University of Delaware, Newark, DE

    Kemble, LJ
    Research Associate II, University of Delaware, Newark, DE

    Committee/Subcommittee: E35.22

    DOI: 10.1520/STP25140S