Chemical Feed Rate Calculator

Inputs

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Process, well, pipe or treatment flow receiving the chemical dose.
L/min
Target dose as active ingredient. In water treatment, 1 mg/L is approximately 1 ppm.
mg/L
Active ingredient concentration by mass. Example: 12.5% sodium hypochlorite.
% active
Product density relative to water. SG 1.2 means roughly 1.2 kg/L.
Maximum metering pump output at the intended pressure and stroke/speed setting.
L/h
Usable chemical volume in the tank, tote or carboy.
L
Optional margin applied to the target dose before sizing the product feed rate.
%

Results

Default result
Edit inputs
Chemical feed rate(Q_chem)
0.088L/h
Pass

product feed rate including the entered margin

Also computed

Chemical feed rate(Q_chem)Pass1.467mL/min

Chemical feed rate(Q_chem)0.5579gpd

Pump setting(Q_chem/Q_pump)Pass7.333%

pump setting is in a practical screening range

Tank runtime(t_tank)Pass35.51days

Dose with margin(D_eff)2.2mg/L

Active ingredient mass flow(m_dot_active)0.0132kg/h

Chemical feed preview: 1.47 milliliters per minute, pump setting 7.3 percentChemical feed previewProduct feed from target dose, strength, specific gravity and water flow.day tankmetering pumptreated water linePump setting7.3% of rated pump capacityFeed 1.47 mL/min (0.56 gpd); tank runtime 35.51 days.
Method notes 3 notes
  • Feed rate uses Q_chem = Q_water*D*60/(1e6*strength*SG), with strength as a mass fraction and an optional dose margin.
  • 1 mg/L is treated as 1 ppm for dilute water solutions. Make sure the entered dose is as active ingredient, not as purchased product, unless that is your intended convention.
  • Final chemical feed systems need chemical compatibility, pressure rating, calibration drawdown, anti-siphon/backpressure devices, safety controls, analyzer feedback and operator procedures.

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