AODD vs Electric Diaphragm vs Centrifugal Pumps: What's the Difference
When it comes to pumping fluids – whether that’s chemicals, waters or slurries – choosing the right pump can have a big impact on safety, efficiency and cost.
In this guide, we break down the key differences between three common pump types:
AODD pumps
Electric Diaphragm Pumps
Centrifugal Pumps
⚙️ How Each Pump Works
AODD (Air-Operated Double Diaphragm) Pumps
- Powered by compressed air.
- Two diaphragms flex alternately, drawing in and pushing out fluid.
- No electric motor or rotating components.
✅ Best for: Hazardous, abrasive, or viscous fluids. Can run dry, self-prime, and handle solids.
Electric Diaphragm Pumps
- Similar diaphragm mechanism but powered by an electric motor.
- Usually, one diaphragm or a mechanical crank system.
- Often quieter and more energy-efficient than AODD.
✅ Best for: Smaller flow applications where air isn't available or energy efficiency is a priority.
Centrifugal Pumps
- Use a spinning impeller to create centrifugal force and move fluid.
- Continuous, non-pulsating flow.
- Requires priming and cannot run dry.
✅ Best for: High-volume, low-viscosity fluids like water, mild chemicals, and fuel.
Advantages & Disadvantages
AODD Pumps
Advantages:
- Versatile across various industries
- No electricity is needed
- They run dry safely
- Excellent for solids & slurries
Disadvantages:
- They use more energy - air compressors consume more power compared to an equivalent electric motor.
- Pulsating Flow
- Noisy without mufflers
Electric Diaphragm Pumps
Advantages:
- More energy efficient than an AODD
- Quieter Operation
- Compact for small systems & spaces
Disadvantages:
- Not suitable for flammable zones unless ATEX-rates
- Less forgiving with solids
- More complex electronics
Centrifugal Pumps
Advantages:
- High flow rates
- Smooth, continuous flow
- Simple, low-cost design
Disadvantages:
- Cannot run dry
- Poor suction lift
- Can't handle viscous or abrasive fluids well
Choosing between an AODD, electric diaphragm, or centrifugal pump comes down to your application’s needs: the fluid type, safety requirements, flow rate, and energy concerns. Not sure what suits your process best? Get in touch with Crest Pumps — we’re happy to help you match the right pump to your system.
Want to know more about AOD pumps? Head to our complete guide to AOD pumps