A metering pump delivers a precise, repeatable chemical dose against the system back-pressure. Selection is set by four things: the dose rate (typically litres per hour), the injection pressure the pump must overcome, the chemical being dosed — which fixes the wetted materials (liquid end, diaphragm, valves, seals) — and the required accuracy and control (manual, pulse, or 4–20 mA / digital). Solenoid-diaphragm pumps suit low flows and modest pressure; motor and hydraulic-diaphragm and plunger pumps reach higher flow and pressure with API 675 accuracy; peristaltic pumps handle abrasive or off-gassing chemicals.
Pump data and material options come from the engineering reference database. Always verify chemical compatibility, turndown and back-pressure with the manufacturer and calibrate on the actual chemistry before commissioning.
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