Chemical Injection and Dosing Pumps

A chemical injection pump puts a measured amount of chemical into a pressurized line on every stroke, through an injection valve or a quill. Call it a chemical dosing pump, and you are describing the same machine by what it is set to deliver. Three things decide which one you need: the chemical, the pressure at the point of injection, and the signal that tells the pump how fast to run.

Cleanflow stocks chemical injection pumps from Chem-Tech, Pulsafeeder, LMI, and MEC-O-MATIC. All of them are electric chemical injection pumps, 115 or 230 V. There are no pneumatic or solar oilfield pumps here. Injection valves, foot valves, liquid ends, and rebuild kits are for chemical metering pumps.

Choose by the Chemical

Sodium hypochlorite and chlorine

Liquid chlorine for water treatment is sodium hypochlorite, and it gives off gas inside a pump head. In a standard diaphragm pump, that gas collects, the head loses prime, and the dose stops.

Two designs get around it. A peristaltic pump pushes gas and liquid through the tube together: the Chem-Tech XP and XPV, and the MEC-O-MATIC Dolphin and VSP.

A degassing head vents the gas back to the tank: the Chem-Tech Series 100 Degas, the LMI C HI and B9 HI, the LMI B series in its chlorine-handling version, and the Pulsafeeder degassing head conversion kit for a PULSAtron already installed.

Any of them will hold a chlorine residual; choose between them on pressure and control below.

Acids, caustics and corrosion inhibitors

These do not off-gas, so the question is what touches the chemical. Pulsafeeder builds the PULSAtron C Plus and E Plus with glass-filled polypropylene, PVC or PVDF heads and PTFE-faced diaphragms. LMI's B and C series use clear acrylic heads with PVDF valve cartridges. The Chem-Tech XP and XPV run a Norprene tube as standard and a Fluran tube where Pulsafeeder calls for more chemical resistance.

Check your chemical against the manufacturer's compatibility chart for the head, the balls, the seats and the tube, then choose the pump.

pH, coagulant and other low-pressure feeds

Where the line pressure is low, a peristaltic pump with a simple speed control gives an accurate dose at the lowest cost. The MEC-O-MATIC Dolphin runs 13 to 97 GPD and the VSP 12 to 20 GPD, both at 25 PSI. For a steady, fixed dose at up to 100 PSI, the motor-driven Chem-Tech Series 100 covers 3 to 30 GPD.

Choose by Pressure and Flow

The pump has to beat the pressure at the injection point with margin, and on every model the pressure rating falls as the flow rises, so read both figures at the point you need. The table lists each pump on this page with its range as the manufacturer publishes it. High-pressure chemical injection pumps, for lines above 125 PSI, are the PULSAtron E Plus and the LMI B and C models at their smallest flows.

The Pulsafeeder degassing head kit converts a PULSAtron of up to 30 GPD for hypochlorite service. The MEC-O-MATIC flow indicator and Viton tube kit are accessories for the Dolphin and VSP.

Choose by Control

There are three ways to set the dose.

• Manual. Dials or a knob hold one rate until you change it. The C Plus, the two-dial LMI pumps, the XP, the Dolphin, and the VSP.
• Water-meter pulse. The pump takes a contact from a water meter and doses in proportion to flow. The XP pulse-input model, and a PULSAtron fitted for external pacing.
• 4-20 mA. The pump follows a controller that reads a chlorine residual or a pH value. The E Plus, the LMI B9, C9 and B9 HI, and the XPV, which also accepts a Hall effect or water meter signal.

If the process flow varies through the day, a pulse or 4-20 mA pump keeps the dose right. If it does not, a manual pump is enough.

Where Chemical Injection Pumps Go

The same chemical injection pumps do four jobs.

• Water treatment. Chlorination and pH correction at a municipal plant, a wastewater plant or a private well.
• Boilers and cooling towers. Scale and corrosion inhibitor into feedwater and recirculating loops.
• Agriculture. Fertigation and nutrient dosing through irrigation lines.
• Industry. Process chemical feed on a production line and in power generation. Chemical injection pumps for oil and gas at up to 300 PSI, for inhibitor, biocide, and scale control on surface lines. These are electric pumps, not pneumatic or solar wellhead injectors.

Pulsafeeder lists all of these for every line stocked here. The pump is the same across them; the chemical, the pressure, and the signal pick the model.

The Four Brands

Pulsafeeder PULSAtron solenoid diaphragm pumps carry the widest pressure range on the page and NSF 61 on their PVDF and PVC degassing-head models. KOPkits and valves are in the Pulsafeeder collection.

Chem-Tech is Pulsafeeder's water-conditioning line: the peristaltic XP and XPV, certified by the WQA to NSF/ANSI/CAN 61 and 372, and the mechanical diaphragm Series 100. Tubes, grease, and KOP kits are in the Chem-Tech collection.

LMI, from Milton Roy, makes solenoid diaphragm pumps in two-dial and electronic versions, with auto-degassing chlorine models. Liquid ends and valves are in the LMI collection.

MEC-O-MATIC is Pulsafeeder's low-pressure peristaltic line for chlorine, pH, and coagulant feed.

Chemical Injection Pumps for Sale in Canada and the USA

Every chemical injection and dosing pump on this page ships from our Winnipeg warehouse across Canada and the USA, with free shipping on orders over $199, a 30-day return or exchange window through our returns portal, and each manufacturer's warranty. Send the chemical, the dose, the process flow, and the pressure at the injection point to info@cleanflow.ca or call 1-866-335-1078, and we will size the pump.