Chemical Injection & Dosing Pumps (pH, Biocides, Inhibitors, Polymers)
Hit your ppm targets with digital diaphragm metering for clean reagents and peristaltic for off-gassing, slurries and polymers. We package pumps with back-pressure/relief valves, calibration columns, pulsation dampeners, degassing valves and injection quills—plus controllers and signals for PLC/BMS integration. Brands: LMI (PD/TD, KML/KBL), Neptune (500/600), Emec, Walchem (controllers), Grundfos (CR utility/transfer), Finish Thompson & Iwaki (mag-drive transfer), J.L. Wingert (columns, quills, tanks).
Best-Fit Pumps for Injection & Dosing
| Dosing Duty | Best Pump Type | Recommended Brands | Why It’s Best |
|---|---|---|---|
| Chlorine, acids/alkalis, inhibitors (clean reagents) | Digital diaphragm metering (PVDF/PTFE heads) | LMI PD/TD; Neptune 500/600; Emec; Walchem | High turndown, accurate stroke control, easy remote signals |
| Off-gassing hypo, polymer make-down, slurries | Peristaltic (hose/tube) metering | LMI KML/KBL | Self-priming, gas-tolerant, runs dry; fluid only touches hose |
| Bulk chemical transfer to day tanks | Mag-drive sealless centrifugal | Finish Thompson DB/UC; Iwaki MX/MD | Leak-free containment; strong compatibility range |
| Building utility water for dilutions | Multistage / end-suction utility pumps | Grundfos CR; NB/NK | Reliable pressure/flow backbone for dosing systems |
| Verification & injection hardware | Calibration columns, quills, back-pressure & relief | J.L. Wingert | Auditable dosing with proper back-pressure and check valves |
| Monitoring & control | pH/ORP/conductivity controllers and I/O | Walchem | Closed-loop ppm control, alarms and remote communications |
Note: We confirm chemical compatibility, viscosity/SG, required turndown, line pressure, gas-entrainment, and signal/communication needs.
Recommended Injection/Dosing Packages (Placeholders)
Tip Share chemical (SDS), target ppm and flow window, discharge pressure, piping materials, available signals (4-20 mA, pulse, Modbus, relay) and enclosure rating. We’ll return curves and a complete BOM.
How We Engineer Dosing Skids
- Accuracy & turndown—right pump head, stroke profile and dampening for metering devices.
- Line control—back-pressure, relief and anti-siphon to stabilize flow into the process.
- Gas & solids—peristaltic for off-gassing/slurries; degassing valves where needed.
- Signals—4-20 mA, pulse, relay, remote enable, and controller integration.
- Verification—calibration columns and sampling points for auditable dosing.
Common Injection/Dosing Uses
- pH neutralization and alkalinity control
- Disinfection (hypo, bromine, peroxide)
- Corrosion/scale inhibitors
- Coagulants/flocculants and polymers
- Anti-scalants for RO and cooling towers
- Boiler treatment and oxygen scavengers
- Food & beverage additives (non-contact)
- Process batching and micro-dosing
- Wastewater nutrient dosing
- Colorants and flavor dosing
Hit Spec. Hold Setpoint.
Send chemical (SDS), target ppm and flow window, discharge pressure, available signals and enclosure class. We’ll quote a complete injection package—fast.
Injection & Dosing FAQs
Peristaltic vs. diaphragm—when to choose each?
Use diaphragm for clean reagents and tight accuracy at pressure. Choose peristaltic for off-gassing, slurries or when the fluid must be isolated from the mechanism.
How do you stabilize dose into varying line pressure?
We add back-pressure valves, relief, check valves and pulsation dampeners; the controller (or 4-20 mA) trims stroke/speed to hold setpoint.
What information do you need to quote a dosing skid?
Chemical (SDS), ppm and flow range, discharge pressure, ambient and enclosure class, materials restrictions, available signals and any validation requirements.