Additive Injection Pumps for Water, Oil & Process Fluids
Precise, pulse‑free dosing of corrosion inhibitors, scale control agents, coagulants, emulsion breakers and more—using API 675 metering pumps, electric diaphragm pumps, and progressive‑cavity skids from LMI, Neptune, Walchem, Emec and Netzch.
Which Pump Technologies Thrive in Additive Injection?
| Requirement | Best Technologies | Brands | Notes |
|---|---|---|---|
| Low‑flow, high accuracy (≤1 GPH) | Solenoid/SERVO metering | LMI PD, Walchem EWN | ±1 % steady‑state accuracy, stroke‑length turndown 1000:1 |
| High‑pressure pipelines (to 3000 PSI) | Hydraulic diaphragm/API 675 | Neptune 500/600, Grundfos DDA HP | Double diaphragm w/ internal relief; leak detection |
| Viscous polymers (1000 cP+) | Progressive‑cavity dosing | Netzsch | Constant flow, low shear, API 675 frame‑mount |
| Offshore / hazardous zone | Pneumatic AODD skids | Wilden H PX, Yamada NDP | ATEX certified, run‑dry capable |
Placeholders for Your In‑Stock Dosing Pumps
How We Size Additive‑Injection Pumps
- Turn‑down & stroke optimization for ±1 % accuracy across the full range.
- NPSH & degassing for off‑gassing chemicals (e.g., NaOCl).
- Viscosity correction on PC and diaphragm flow curves.
- Tubing & back‑pressure valves matched to discharge pressure.
- Skid integration with calibration columns, relief valves & drains.
Typical Additives & Fluids
- Corrosion / scale inhibitors
- Biocides (oxidizing & non‑oxidizing)
- Coagulants & flocculants
- Demulsifiers, emulsion breakers
- Surfactants & foaming agents
- pH adjustment acids/caustics
- Polymer feed (sludge dewatering)
- Drag‑reducing agents (pipelines)
- Chlorination / de‑chlorination
- Hydrate inhibitors (MEG)
Need Precise Dosing in 24 hrs?
Send us chemical SDS, desired GPH & pressure, and we’ll spec an injection pump that lasts.
Additive Injection FAQs
What's the difference between hydraulic & mechanical diaphragm metering pumps?
Hydraulic diaphragm pumps isolate the wetted diaphragm with oil, handle higher pressures (1500–3000 PSI), and include an internal relief. Mechanical versions are direct‑acting, simpler, and ideal for medium pressure (up to ~350 PSI).
How much turn‑down do I need?
Most water treatment skids need at least 10:1. Modern digital‑drive solenoid pumps (LMI PD) offer 1000:1 without losing accuracy.
Can I dose polymer with a diaphragm pump?
Yes—provided you stay below ~500 cP and keep suction flooded. Above that, we recommend progressive‑cavity pumps with low RPM and degassing heads.