42 PI-121 January 2020
Flow Charts
Nozzle Selection Chart
Flow
Rate
(gpm)
Size of
Fixed
Orifice
(in.)
Quantity and Size of Gun Nozzles
2 Nozzles 3 Nozzles 4 Nozzles 5 Nozzles 6 Nozzles
2.1 .023 .016 .013 .011 .010 .009
2.3 .024 .017 .014 .012 .011 .010
2.5 .025 .018 .014 .012 .011 .010
2.7 .026 .018 .015 .013 .012 .011
2.9 .027 .019 .016 .013 .012 .011
3.1 .028 .020 .016 .014 .012 .011
3.4 .029 .021 .017 .015 .013 .012
3.6 .030 .021 .017 .015 .013 .012
3.8 .031 .022 .018 .015 .014 .013
4.1 .032 .023 .018 .016 .014 .013
4.4 .033 .023 .019 .017 .015 .014
4.6 .034 .024 .020 .017 .015 .014
4.9 .035 .025 .020 .017 .016 .014
5.2 .036 .025 .021 .018 .016 .015
5.5 .037 .026 .021 .019 .017 .015
5.8 .038 .027 .022 .019 .017 .016
WJTA recommends maximum rear thrust of 60 lbs.
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