Leadership

SIZING NOZZLE TIPS TO AID CALCULATIONS FOR DISCHARGE

Issue 2 and Volume 93.

SIZING NOZZLE TIPS TO AID CALCULATIONS FOR DISCHARGE Numbers Bearing a Relationship to the Flow Replace the Old Linear Measurement of Tips Assistant Chief NOZZLE tips are commonly sized according to their diameters in inches and fractions of inches. In order to arrive at the value of the flow from any particular nozzle, it is necessary to square this diameter, multiply it by a constant factor (29.83), and the flow in gallons for one pound of pressure per square inch is the result. To get the flow for any other pressure, the square root must be extracted from the pressure; the product of this square root and the flow for one pound of pressure being the total flow. Now, for ordinary field practice it would seem that a simpler method should suffice and would at the same time give firemen a better idea as to the size of nozzle tips…

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