Spray Nozzle Flow Rate Calculator

This calculator is meant to assist you with estimating the flow rate of a spray nozzle at pressures that aren't listed in a catalog or if you do not have a catalog readily available.  Many nozzle companies use a part number that describes the spray angle and flow rate at 40 PSI.  For instance, a "6520" is usually a 65° angle flat fan nozzle flowing ~2 GPM at 40 PSI.  In the example below, the flow rate at 150 PSI is calculated to be ~3.87 GPM.  Ultimately this calculator can be used to determine the required flow rate for a spray header, please see our Spray Coverage Calculator for assistance with determining the number of nozzles required.

Directions: Change the blue INPUT numbers and Click the Update button.

This equation is based upon the formula Q2 = Q1 x (Square Root of P2 / P1).  Q1 and P1 are the known flow rate and pressure. Q2 is the resulting flow rate for the pressure in question P2.   Q2a, Q2b and Q2c refer to the nozzle type in question.

 

  INPUT Theoretical Flow
  Specific Gravity
(Water = 1)
Known
Flow
Known
Pressure
Desired
Pressure
Flat Fan
Hollow Cone
Solid Stream
Full Cone
(<120° angle)
Full Cone
(>120° angle)
  Sg Q1 P1 P2 Q2a Q2b Q2c
 
    GPM PSI PSI GPM GPM GPM
         
  Gallons
per Hour
GPH     GPH GPH GPH
     
       
  Liters
per Minute
LPM (Q1) BAR (P1) BAR(P2) LPM (Q2a) LPM (Q2b) LPM (Q2c)
 

Note: There are factors besides specific gravity, such as liquid temperature, that effect flow rate.  This data is based upon using water at 70°F and is only meant as a reasonable guide for typical spray nozzle applications.  It is always a good idea to discuss your application requirements with spray nozzle professionals such as TPS, as we've specialized in spray nozzle applications for over 25 years.

 

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