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How Do You Size an AODD Pump?

Sep. 13, 2023

Sizing an Air-Operated Double Diaphragm (AODD) pump is a crucial step in selecting the right pump for your specific application. AODD pumps are versatile and used in various industries for transferring fluids, but selecting the correct size is essential for optimal performance and efficiency. Here are the steps to properly size an AODD pump:


Understand Your Application Requirements:

Start by thoroughly understanding the requirements of your application. Consider factors such as the type of fluid being pumped (chemical, viscous, abrasive, etc.), the flow rate needed, the pressure or head required, and any special conditions like temperature or viscosity.

Calculate Flow Rate (Q):

Determine the required flow rate for your application. This is typically expressed in gallons per minute (GPM) or liters per minute (LPM). Ensure that you account for any variations in flow rate that may occur during operation.

1/4 Inch PVDF/Full Polypropylene Diaphragm Pump

1/4 Inch PVDF/Full Polypropylene Diaphragm Pump

Determine Total Head (H):

Calculate the total head or pressure required to overcome any resistance in the system, including friction losses, elevation changes, and pressure needed to overcome any filters or nozzles. This is typically measured in feet or meters of head.

Select Materials of Construction:

Choose the materials for the wetted parts of the pump (diaphragms, valves, pump body) based on the compatibility with the fluid being pumped. Consider factors such as chemical resistance and abrasion resistance.

Account for Safety Factors:

Add safety factors to your flow rate and head calculations to ensure the pump can handle variations in the system or unforeseen conditions. A common safety factor is 10-20% above the calculated requirements.

Consider Piping and System Design:

Evaluate the piping and system design to ensure it is compatible with the pump's flow rate and pressure requirements. Properly sized pipes and fittings are crucial for achieving the desired performance.

Check Manufacturer's Data:

Review the manufacturer's pump curves and technical data for the AODD pump models you are considering. These curves provide performance data, including flow rates and pressure for different pump sizes.

Choose the Right Pump Size:

Based on your calculations and the manufacturer's data, select an AODD pump size that meets or slightly exceeds your application requirements. It's better to have a pump that can handle slightly more than your needs than one that's underpowered.

Consider Air Supply:

Ensure that you have an adequate and properly regulated air supply to operate the AODD pump efficiently. The air pressure and volume must match the pump's requirements.

Installation and Testing:

Install the selected AODD pump in your system according to the manufacturer's recommendations. Test the pump under actual operating conditions to verify that it meets your application's requirements.

Maintenance and Monitoring:

Establish a maintenance schedule and monitoring system to ensure the continued performance and reliability of your AODD pump. Regularly check diaphragms, valves, and seals for wear and damage.

Consider Automation:

Depending on your application, consider adding automation or control systems to the AODD pump to optimize its operation and responsiveness to changes in demand.

Properly sizing an AODD pump is essential for achieving the desired flow rate, pressure, and reliability in your specific application. It's important to consult with the manufacturer or a pump specialist if you have any doubts or require assistance in selecting the right pump for your needs.