Industrial Pumps: Types, Working Principles & Selection Guide

Pumps move everything. Water from a borehole in Kenya to a treatment plant. Crude oil from a wellhead in Nigeria to a refinery. Chemicals through a process reactor in Saudi Arabia. Sewage from a construction site in Dubai to a disposal point. Without pumps, nothing flows.

Choosing the wrong pump means wasted energy, premature failure, constant maintenance, and process downtime. Choosing the right pump means reliable operation for years with minimal intervention. The difference comes down to understanding which pump type matches your fluid, your pressure, your flow rate, and your operating conditions.

This guide covers every major industrial pump type, how each one works, what it is best for, and how to select the right pump for your application.

Two Fundamental Categories

Every industrial pump falls into one of two categories based on how it moves fluid:

Dynamic pumps use a rotating impeller to add velocity to the fluid, which is then converted to pressure. The most common type is the centrifugal pump. Dynamic pumps are best for high flow rates with clean, low-viscosity fluids. They account for approximately 70% of all industrial pump installations worldwide.

Positive displacement (PD) pumps trap a fixed volume of fluid and mechanically force it through the discharge. Types include gear pumps, diaphragm pumps, screw pumps, piston pumps, and lobe pumps. PD pumps deliver consistent flow regardless of discharge pressure and are best for viscous fluids, precise metering, and high-pressure applications.

The simple rule: If you are pumping clean water or light fluids at high flow rates, start with a centrifugal pump. If you are pumping thick, abrasive, corrosive, or chemically sensitive fluids — or need precise dosing — look at positive displacement.

Centrifugal Pumps

Centrifugal pumps are the workhorses of industry. Simple, reliable, efficient, and available in hundreds of configurations from fractional-horsepower utility pumps to massive units moving thousands of cubic meters per hour.

How they work: A motor drives a rotating impeller inside a volute casing. As the impeller spins, it accelerates the fluid outward by centrifugal force, converting mechanical energy into velocity. The volute casing then converts that velocity into pressure. Fluid enters axially through the center (the "eye") of the impeller and exits radially into the discharge pipe.

Key performance parameters:

• Flow rate (Q) — measured in m³/h or GPM

• Head (H) — the height to which the pump can raise fluid, measured in meters. Head is independent of fluid density.

• NPSH (Net Positive Suction Head) — the minimum suction pressure required to prevent cavitation. NPSHa (available from the system) must exceed NPSHr (required by the pump).

• Efficiency — the ratio of hydraulic power output to mechanical power input. Centrifugal pumps are most efficient at their Best Efficiency Point (BEP).

Types of centrifugal pumps:

End-suction pumps — the most common configuration. Single impeller with suction on one end and discharge on top. Used for general water transfer, HVAC circulation, irrigation, and light industrial duty.

Split-case (horizontal split) pumps — the casing splits horizontally for easy maintenance access to the impeller and bearings without disconnecting piping. Used for high-flow water supply, fire protection, and cooling water systems. Available in single-stage and multi-stage configurations.

Vertical turbine pumps — the pump bowls are submerged in the fluid source (a well, sump, or reservoir) and the motor sits above ground level, connected by a long shaft. Used for deep well water extraction, municipal water supply, and irrigation. Ideal for applications where the water level is too deep for a surface-mounted pump to achieve suction.

Multi-stage pumps — multiple impellers arranged in series within one casing, with each stage adding more pressure. Used for high-pressure applications such as boiler feedwater, pipeline boosting, and high-pressure cleaning. Can generate pressures exceeding 100 bar.

Self-priming pumps — designed to evacuate air from the suction line and prime themselves without external assistance. Used where the pump is mounted above the fluid source and the suction line must be cleared of air before pumping can begin.

Best for: Water supply and distribution, cooling water circulation, irrigation, process water transfer, HVAC systems, fire protection, and any application requiring high flow rates of clean or moderately clean fluids.

Limitations: Performance drops significantly with viscous fluids (above ~200 centipoise). Cannot run dry — dry running destroys the mechanical seal within minutes. Not suitable for precise flow metering. Cannot handle high solids content without specialized impeller designs.

Submersible Pumps

Submersible pumps operate entirely underwater, with the motor and pump sealed in a single waterproof unit. They push fluid upward rather than pulling it, which eliminates suction limitations and priming problems.

How they work: The motor and pump are enclosed in a hermetically sealed housing that prevents water ingress. The pump impeller is directly coupled to the motor shaft. When submerged, the pump draws fluid in through an intake screen and pushes it up through the discharge pipe to the surface.

Types:

Borehole / deep well submersible pumps — slim cylindrical design that fits inside a drilled borehole. Available in diameters from 4" to 12"+ for wells of various sizes. Multi-stage impellers generate the head needed to lift water from depths of 50 to 500+ meters. This is the pump type most in demand across Africa for rural and urban water supply projects.

Sewage / wastewater submersible pumps — heavy-duty construction with vortex or channel impellers designed to pass solids without clogging. Used in sewage lift stations, wastewater treatment plants, and construction dewatering. Available with cutting mechanisms for handling fibrous waste.

Drainage / dewatering pumps — lighter-duty submersible pumps for removing water from flooded areas, construction sites, and basements. Handle clean to moderately dirty water with small suspended particles.

Slurry submersible pumps — designed with wear-resistant materials (high-chrome iron, rubber-lined) to handle abrasive slurries in mining, dredging, and industrial applications.

Best for: Water well extraction (Africa, Middle East — massive demand), sewage pumping, construction dewatering, mine dewatering, flood control, and any application where the pump must operate submerged.

Key considerations for Africa and Middle East projects: Borehole submersible pumps are the single most critical pump type for water infrastructure development. Specify pumps with corrosion-resistant stainless steel construction for borehole water, ensure the motor is rated for the local voltage and frequency (380V/50Hz standard in most of Africa and ME), and select the correct flow rate and head for the borehole depth and required surface pressure.

Gear Pumps

Gear pumps are positive displacement pumps that use meshing gears to move fluid. They deliver smooth, pulse-free flow and handle viscous fluids exceptionally well.

How they work: Two interlocking gears rotate inside a close-tolerance housing. Fluid is trapped in the spaces between the gear teeth and the casing wall, then carried from the suction side to the discharge side as the gears rotate. The tight clearances between gear teeth and casing prevent backflow.

Types:

• External gear pumps — two identical gears mesh externally. Higher pressure capability, used for hydraulic systems, fuel oil transfer, and lubrication.

• Internal gear pumps — a smaller gear rotates inside a larger gear. Handles a wider viscosity range, quieter operation, used for food products, resins, and adhesives.

Best for: Fuel oil transfer, lubrication systems, hydraulic power units, chemical dosing of viscous fluids, and food-grade product transfer (chocolate, syrups, creams).

Limitations: Not suitable for abrasive fluids (gear wear), not suitable for low-viscosity fluids at high pressures (internal leakage).

Diaphragm Pumps

Diaphragm pumps use a flexible membrane that moves back and forth to create a variable-volume chamber that draws in and expels fluid. The fluid never contacts the moving mechanical parts, making these pumps ideal for corrosive, abrasive, and hazardous fluids.

How they work: A diaphragm (rubber, PTFE, or thermoplastic) flexes to create alternating suction and discharge strokes. Check valves on the suction and discharge sides ensure one-directional flow. The diaphragm can be driven by compressed air (AODD — Air-Operated Double Diaphragm), electric motor, or hydraulic actuator.

Types:

• AODD (Air-Operated Double Diaphragm) — powered by compressed air, no electricity needed. Ideal for hazardous environments where electrical sparks are prohibited. Can run dry without damage. Self-priming.

• Electric diaphragm pumps — motor-driven, lower operating cost than AODD, suitable for continuous-duty applications.

• Metering / dosing diaphragm pumps — precision pumps that deliver exactly controlled flow rates for chemical injection, water treatment dosing, and laboratory applications.

Best for: Chemical transfer (acids, alkalis, solvents), wastewater with solids, mining slurry, paint and coatings, food processing, and any application with corrosive, abrasive, or shear-sensitive fluids. Also used for chemical dosing in water treatment plants across Africa and the Middle East.

Screw Pumps

Screw pumps use one or more helical screws that rotate inside a close-fitting housing to move fluid along the screw axis. They provide smooth, continuous, low-pulsation flow.

Types:

• Progressive cavity pumps (single screw) — a single helical rotor turns inside a double-helix stator (usually rubber). Handles viscous fluids, slurries, and fluids with high solids content. Common in wastewater treatment, food processing, and oil production (downhole artificial lift).

• Twin screw pumps — two intermeshing screws provide positive displacement without metal-to-metal contact. Used for crude oil transfer, LPG, and clean petroleum products. Can handle multi-phase flow (gas + liquid).

• Triple screw pumps — three screws provide high-pressure, low-pulsation flow. Used for lubrication systems, hydraulic elevators, and fuel oil transfer.

Best for: Viscous fluid transfer, crude oil pumping, food processing, wastewater sludge, and applications requiring low pulsation.

Piston / Plunger Pumps

Piston and plunger pumps are reciprocating positive displacement pumps that generate very high pressures. A piston or plunger moves back and forth inside a cylinder, drawing fluid in through suction valves and forcing it out through discharge valves.

Best for: High-pressure applications — pipeline injection (methanol, corrosion inhibitor), high-pressure cleaning and jetting, hydraulic fracturing, water injection in oil fields, and reverse osmosis desalination.

Key characteristic: Can generate pressures from 100 bar to over 1,500 bar depending on the design.

Fire Pumps

Fire pumps are specifically designed and certified for fire protection systems. They must start automatically, reach full pressure within seconds, and run reliably for extended periods under emergency conditions.

Types: Electric motor-driven (most common in buildings), diesel engine-driven (for sites without reliable electrical supply), and jockey pumps (small pumps that maintain system pressure between fire events).

Standards: NFPA 20 (Standard for the Installation of Stationary Pumps for Fire Protection) governs fire pump selection, installation, and testing. UL Listed and FM Approved certifications are required by most building codes and insurance requirements.

Best for: Building fire sprinkler systems, industrial fire protection, high-rise buildings, warehouses, and any facility requiring code-compliant fire suppression.

How to Select the Right Pump

Selecting a pump requires matching the pump characteristics to your system requirements. Here are the key parameters:

Step 1 — Define the fluid. What are you pumping? Water, crude oil, chemicals, sewage, slurry? What is the viscosity, temperature, specific gravity, solids content, and chemical composition? This determines whether you need a centrifugal or positive displacement pump, and what materials of construction are required.

Step 2 — Determine flow rate. How much fluid must be moved per hour (m³/h or GPM)? This is the primary sizing parameter.

Step 3 — Calculate total head. Total dynamic head (TDH) = static head (elevation difference) + friction losses in piping + pressure required at discharge point. This determines the pump's pressure capability.

Step 4 — Check NPSH. Calculate the net positive suction head available (NPSHa) from your system. The pump's NPSHr must be lower than NPSHa to avoid cavitation.

Step 5 — Select the pump type. Based on fluid properties, flow, head, and application.

Step 6 — Choose materials. Cast iron for clean water. Stainless steel for corrosive fluids. High-chrome iron for abrasive slurries. Bronze-fitted for seawater. Rubber-lined for aggressive slurries.

Step 7 — Specify the motor. Voltage, frequency (50Hz or 60Hz), protection class (IP55 standard for industrial), hazardous area classification (ATEX/IECEx for explosive environments).

Quick Reference: Which Pump for Which Job?

Supply from Kasko Makine

Kasko Makine supplies industrial pumps for water infrastructure, oil and gas, chemical processing, power generation, construction, and fire protection projects:

Centrifugal pumps: End-suction, split-case, vertical turbine, multi-stage, self-priming. Cast iron, stainless steel, and bronze-fitted construction.

Submersible pumps: Borehole pumps (4"–12"), sewage pumps, drainage pumps, slurry pumps. Stainless steel and cast iron. 50Hz and 60Hz motors.

Positive displacement pumps: Gear pumps, diaphragm pumps (AODD and electric), screw pumps, progressive cavity pumps, metering/dosing pumps.

Fire pumps: Electric and diesel-driven, NFPA 20 compliant, UL Listed / FM Approved, with jockey pumps and controllers.

Complete pump packages: Pump + motor + baseplate + coupling + suction and discharge piping + control panel — engineered and shipped as a complete unit ready for installation.

We also supply the pipe, flanges, fittings, and fasteners that connect to your pumps — single-source procurement for your entire project.

FAQ SCHEMA

Q: What are the main types of industrial pumps?
A: Industrial pumps are divided into two categories: dynamic pumps (centrifugal, which use a spinning impeller — about 70% of all installations) and positive displacement pumps (gear, diaphragm, screw, piston — which trap and push fixed volumes of fluid). Centrifugal pumps are best for high-flow, low-viscosity applications. Positive displacement pumps are best for viscous, abrasive, or precise-metering applications.

Q: What type of pump is used for borehole water extraction?
A: Submersible borehole pumps are the standard for extracting water from drilled wells. The pump and motor are lowered into the borehole and push water to the surface. They are available in 4" to 12"+ diameters with multi-stage impellers capable of lifting water from depths of 50 to 500+ meters. Stainless steel construction is recommended for corrosion resistance.

Q: What is the difference between a centrifugal pump and a positive displacement pump?
A: A centrifugal pump uses an impeller to add velocity and pressure to fluid — flow rate varies with pressure. A positive displacement pump traps a fixed volume of fluid and pushes it through the discharge — flow rate stays constant regardless of pressure. Centrifugal pumps are best for clean, high-flow applications. PD pumps are best for viscous fluids, high pressures, and precise metering.

Q: What pump is best for pumping crude oil?
A: Twin screw pumps or gear pumps are commonly used for crude oil transfer due to their ability to handle viscous fluids and multi-phase flow (oil + gas). For downhole artificial lift, progressive cavity pumps (single screw) are standard. For high-volume pipeline transfer, centrifugal pipeline pumps may be used for lighter crudes.

Q: What pump do I need for a fire sprinkler system?
A: A fire pump certified to NFPA 20 standards is required. Options include electric motor-driven centrifugal pumps (most common in buildings with reliable power) or diesel engine-driven pumps (for sites without reliable electricity). The pump must be UL Listed or FM Approved, with automatic start capability and a jockey pump to maintain system pressure.

Q: How do I determine the right pump size for my project?
A: You need four key parameters: flow rate (how much fluid per hour), total dynamic head (elevation difference plus friction losses plus required discharge pressure), fluid properties (viscosity, temperature, solids content, corrosiveness), and NPSH available (suction conditions). Provide these to the pump supplier for selection and sizing.

Request a pump quotation — send us your flow rate, head/pressure, fluid type, and application, and our engineering team will select and quote the right pump. Contact us via WhatsApp at +90 (537) 521 1399 or email info@kaskomakine.com. We deliver across Africa, the Middle East, Central Asia, and beyond.