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Metering / Dosing Pump – Plunger Type
High-pressure plunger metering pumps engineered for precise chemical dosing, reliable performance, and continuous operation in demanding industrial applications.
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Precision Reciprocating Pumps for High-Pressure Chemical Dosing
NND Oil & Gas manufactures Plunger Type Metering / Dosing Pumps designed for accurate, repeatable injection of chemicals and process fluids at high pressure. Built on a reciprocating positive displacement design, these pumps are engineered to deliver consistent dosing accuracy even under demanding pressure and temperature conditions found in oil & gas, petrochemical, fertilizer, and other process industries.
Plunger pumps share several design characteristics with diaphragm and piston-type pumps, making them suitable for many of the same applications. What sets them apart is their ability to generate significantly higher discharge pressures, making them the preferred choice wherever high-pressure injection is required. As with all reciprocating pumps, slight pressure pulsation is inherent to the design and can be managed effectively using pulsation dampeners and accessories.
How It Works
A plunger metering pump operates by drawing process fluid into a pumping chamber and displacing it through reciprocating motion of a precision-machined plunger. This positive displacement action ensures a fixed volume of fluid is delivered with each stroke, allowing for highly accurate and repeatable dosing rates. The stroke length and/or speed can be adjusted to vary output flow without compromising accuracy, making the pump ideal for applications where precise chemical dosing directly impacts process quality, safety, or compliance.
Key Features
- Reciprocating, positive displacement plunger design
- High discharge pressure capability for demanding injection applications
- Accurate and repeatable dosing performance
- Capacity adjustment through manual or automated stroke/speed control
- Suitable for low to high viscosity and corrosive chemical fluids
- Robust construction for continuous duty industrial operation
- Available in single (simplex) and multi-head (duplex/triplex/multiplex) configurations for higher flow requirements
- Compatible with heating/cooling jackets for temperature-sensitive fluids
- Self-cleaning and easily accessible valve designs available for low-maintenance operation
Technical Specifications
| Parameter | Details |
|---|---|
| Pump Type | Reciprocating – Plunger Type |
| Capacity Range | From very low flow rates up to high-volume output in simplex configuration; significantly higher capacities achievable in multiplex (multi-pump ganged) configurations |
| Maximum Discharge Pressure | Suitable for high-pressure dosing applications, up to several hundred kg/cm² |
| Capacity Adjustment | Manual control, or automated control via pneumatic, electric, electronic actuators, variable speed drives, or PLC-based systems |
| Operating Temperature Range | Suitable for ambient to high-temperature process fluids |
| Materials of Construction | Stainless steel grades, alloy steels, nickel-molybdenum alloys, high-performance corrosion-resistant alloys, and engineered plastics, selected based on fluid compatibility |
| Configurations | Simplex, Duplex, Triplex, and Multiplex arrangements; fixed-ratio dosing units with batching and automation options |
Available Accessories
- Suction strainers – Y-type and basket-type, with differential pressure indication
- Suction and discharge pulsation dampeners (accumulator/bladder type with gas-charging kits)
- Pressure gauges and pressure switches
- Pressure relief valves
- Injection valves and air-bleeding valves
- Complete dosing system integration with control panels
Applications
Plunger type metering pumps are widely used for:
- Corrosion inhibitor and scale inhibitor injection in oil & gas production
- Methanol and chemical injection in upstream and midstream facilities
- High-pressure dosing in petrochemical and refinery processes
- Chemical dosing in fertilizer and process plants
- Water treatment and boiler feed chemical dosing
- Any application requiring precise, high-pressure, continuous chemical injection
Why Choose NND Oil & Gas
As an ISO 9001:2015 certified manufacturer, NND Oil & Gas designs and builds metering pump systems engineered for reliability under continuous industrial duty. Each pump is manufactured to deliver consistent dosing accuracy, long service life, and ease of maintenance, backed by our engineering expertise across oil & gas, chemical, fertilizer, and process industries in India and overseas.
For technical specifications tailored to your application, or to request a quotation, get in touch with our engineering team.
Frequently asked questions
Both are positive displacement pumps used for dosing, but plunger pumps can generate significantly higher discharge pressures than diaphragm pumps. They are preferred for applications where high-pressure injection is the primary requirement, while diaphragm pumps offer a hermetically sealed, leak-free design suited for hazardous or toxic fluids.
Plunger metering pumps are suitable for a wide range of fluids including corrosion inhibitors, scale inhibitors, methanol, acids, alkalis, and other process chemicals — from low-viscosity liquids to moderately viscous fluids. Material of construction is selected based on fluid compatibility.
Yes. Flow rate can be adjusted by varying the stroke length, stroke speed, or both. Control can be manual or fully automated via pneumatic, electric, or electronic actuators, variable speed drives, or PLC-based systems, without compromising dosing accuracy.
Plunger metering pumps are widely used in oil & gas production, upstream and midstream chemical injection, petrochemical and refinery processes, fertilizer plants, water treatment, and boiler feed chemical dosing — anywhere precise, high-pressure, continuous chemical injection is required.
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