Calibration of chemical feed pumps is important to ensure that the proper amount of water treatment products are being fed to your systems. All chemical feed pumps are designed to pump at a certain rate; however, the actual flow rate can vary depending upon many conditions. Factors such as discharge pressure, chemical viscosity, type of suction (flooded or lift), and pump age will effect the flow rate. This simple procedure should be used on a regular basis to ensure that you are feeding the proper amount of product to your water systems.
Prior to running calibration on chemical pumps, review product MSDS forms and use proper personal protective equipment.
If you are using the same calibration cylinder to calibrate multiple pumps, be sure to rinse it with water between calibrations.
(Pump capacity, gph x Pump speed, % x Pump stroke, %)
(1, gph x 50% x 50%) = (1 x 0.5 x 0.5) = 0.25 gph
((mL pumped, 1 min x 60 minutes) / 3,785)) = gallons per hour
(50 mL x 60 minutes) / 3,785 = 0.79 gallons per hour
Depending on your system, you will need to adjust your pump or controller settings to account for any difference between the design and actual feed rates.