9. Calibrating Chemical Feed Pumps
CALIBRATION OF CHEMICAL FEED PUMPS:
The chemical feed pumps actual flow
rates can differ from the calculated flow rate by as much as 2 times depending
on the amount of back pressure provided by the process fluid. The pumps must be calibrated to ensure that
the correct dose of chemical is being injected.
Once the pump has been calibrated and the multiplier is known it won’t
change over the entire % speed range provided the % stroke remains the same.
- If the pump is supplied with a
calibration column on the suction side of the pump: Fill the calibration column with chemical and
switch the valving, so the pump is drawing from the calibration column
only. With a stop watch, time how long
the pump takes to empty a metered volume of chemical out of the calibration
column. Divide the volume pumped by the
time it took and correct the units to GPH and compare to the settings on the
pump. i.e. A chemical pump pumps 200mL out of a
calibration column in 30 seconds. Flow
Rate = 200mL / 30 secs = 6.6667 mL/sec * (60 sec/min * 60 min/hr.)/1000 mL/L /
3.78L/gallon = 6.35 GPH.
- If the pump isn’t supplied with a
calibration column, then the chemical injection point must be removed from the
process piping and a graduated container would be used to capture the chemical
being pumped while timing how long it takes to fill a specific volume. The pump flow rate is calculated in the same
method as above.
- To calculate the multiplier, divide the
actual flow rate by the calculated flow rate of the pump. To use the example above, if the calculated
flow rate was 5.25 GPH and the calibrated flow rate was 6.35 GPH, the
multiplier would be equal to 6.35 GPH / 5.25 GPH = 1.21.
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