Centrifugal Pump vs. Reciprocating Pump: What’s the Difference?
Centrifugal Pump vs. Reciprocating Pump
The main difference between a centrifugal pump and a reciprocating pump is how each moves fluid. A centrifugal pump uses a rotating impeller to generate centrifugal force, producing smooth but pressure-dependent flow — best suited to high-flow, low-to-medium pressure applications. A reciprocating pump uses positive displacement, moving fluid through the back-and-forth motion of a piston, plunger, or diaphragm, producing a constant flow rate even at high pressure, though with some pulsation.
Most industries use pumps to carry out operations and manufacture products. Any place that needs to move fluid or increase its pressure will likely have a pump. The two types used are centrifugal and reciprocating (positive displacement).
Each has distinct strengths: reciprocating pumps are self-priming, energy efficient, and deliver constant flow at high pressure, while centrifugal pumps offer simpler construction, lower upfront cost, and smoother flow for high-volume, lower-pressure applications. The right choice depends entirely on your specific flow, pressure, and fluid-handling requirements.
Let’s have a look at the two:
Centrifugal Pumps
What is a centrifugal pump?
A centrifugal pump is a rotodynamic pump that uses centrifugal force to move fluid, transferring rotational energy from one or more driven rotors called impellers.
A centrifugal pump uses centrifugal force to move fluid, transferring rotational energy from one or more driven rotors, called impellers. The fluid enters the impeller and is discharged with centrifugal force along the impeller’s circumference through the vane tips.
Usually, an electrical motor powers a centrifugal pump. A centrifugal pump has about 40-50% efficiency on low flow/high head applications.
Common applications of centrifugal pumps include:
- Water supply and municipal distribution systems
- HVAC and building water circulation
- Irrigation and agricultural water transfer
- General industrial fluid transfer where high flow matters more than high pressure
- Firefighting and fire suppression systems
Reciprocating Pumps
What is a reciprocating pump?
A reciprocating pump is a positive displacement pump that moves fluid using the back-and-forth motion of a piston, plunger, or diaphragm, displacing a fixed volume of fluid with each stroke.
Reciprocating pumps are positive displacement pumps that work by capturing a moving fluid in a cavity and discharging a fixed amount of it via mechanical pressure. This fluid displacement takes place with a plunger, piston or diaphragm, depending on the design of the reciprocating pump.
As we learned in the working principle of reciprocating pumps, piston or plunger pump works like a simple bicycle pump – the first stroke of the pump creates a vacuum, releasing the inlet valve and shutting the outlet valve as it creates a suction effect to draw fluid into the piston chamber. As the motion is reversed, the opposite happens due to compression as the inlet valve is under pressure. This pressure causes the inlet valve to close and opens the outlet valve, discharging the fluid in the piston chamber.
A diaphragm pump features an expanding and decreasing cavity. When the cavity expands the liquid is sucked in at the inlet side and when the cavity decreases, the fluid is discharged on the discharge side.
Types of reciprocating pumps include:
- Piston pumps: Suited to moderate-pressure, general fluid transfer
- Plunger pumps: Built for higher-pressure applications like chemical injection and high-pressure washing
- Diaphragm pumps: Fully isolate the process fluid from moving parts, ideal for corrosive or hazardous chemical metering
Reciprocating pumps are further classified as single-acting (discharging on one stroke direction) or double-acting (discharging on both directions), and as simplex, duplex, or triplex based on the number of cylinders working in parallel.
Difference Between Centrifugal and Reciprocating Pump
The main difference between centrifugal and reciprocating pumps lies in how each generates flow: centrifugal pumps rely on rotational velocity from an impeller and perform best at low-to-medium pressure with high flow, while reciprocating pumps use positive displacement and maintain constant flow even at high discharge pressure.
Let’s break it down into a table so you can see and compare the difference between centrifugal and reciprocating pumps.
| Key Features | Centrifugal | Reciprocating |
| Construction | This is simple in construction. | This is complicated in construction. |
| Head or Pressure application | This works on low or medium pressure head. | Reciprocating pump work at the High-pressure head (high discharge pressure) |
| Discharge | Discharge is high (through small heads) | Discharge is low (at high heads) |
| Relief valve requirement | No | Recommended to protect the pump |
| Flow | Smooth | Pulsating |
| Flow rate accuracy and delivery | Variable | Constant |
| Self-priming | No | Yes |
| Space consideration | Depends on flow rate and discharge pressure | Small |
| Initial cost | Low, easy-to-install | High (up to four times the cost of centrifugal) depending on the desired flow rate and pressure |
| Power consumption and efficiency | High power consumption, low efficiency | Low power consumption, high efficiency |
| Maintenance needs | Low, with fewer moving parts. | High, but low total cost of ownership |
| Zero leakage | Magnetic drive technology (can be expensive) | Double diaphragm and leak protection |
| Fluid handling | Used to pump a range of liquids, including clean, clear, abrasive fluids, dirty water, and oil. Can be used to lift highly viscous liquids. | Suitable for clean, clear, and non-abrasive fluids (low viscosity) |
Which Pump Should You Choose?
Use this quick guide to match pump type to your application:
- Choose a centrifugal pump if: you need high flow at low-to-medium pressure, a lower upfront cost, and simple, low-maintenance operation
- Choose a reciprocating pump if: you need constant, accurate flow at high pressure, self-priming operation, or precise metering/dosing capability
- Consider fluid properties too: centrifugal pumps handle a broader range of viscosities and abrasive fluids, while reciprocating pumps are best matched to clean, low-viscosity fluids unless a diaphragm design is used for corrosive chemicals
In summary, the difference between centrifugal and reciprocating pumps lies in their construction, pressure handling, flow characteristics, and overall performance. Centrifugal pumps are known for their simplicity and suitability for low to medium-pressure applications, offering smooth flow but variable flow rate accuracy and delivery.
On the other hand, reciprocating pumps, with their more intricate construction, excel in high-pressure scenarios, delivering a constant flow despite pulsations. They are self-priming but come with a higher initial cost, but their power efficiency, low total cost of ownership, and leak protection advantages make them a good fit for demanding industrial settings. Choosing between these pump types depends on your application requirements and priorities.
If you need help evaluating the difference between centrifugal and reciprocal pumps and deciding which one is right for your system, call us at 1-800-367-4180 (toll-free). As your industrial pump supplier in Canada, we’re here to help you choose, install, maintain, and monitor a variety of equipment. And to answer questions about things you’ve previously tried gone wrong.
