Air operated double diaphragm (AODD) pumps are workhorses across many industries—but that doesn’t mean any pump will do. Husky AODD pumps can handle a wide range of chemicals, viscosities, and flow rates, so the challenge isn’t “can it pump this?” but “which configuration is actually right for my job?”

When you match Husky pump size, materials, and configuration to your fluid and process, you get stable flow, longer life, and fewer surprises. When you don’t, you see cavitation, wear, and air consumption that eats into your operating budget. The best way to avoid that is to walk through a few key questions before you settle on a model.

Start with the fluid: what exactly are you pumping?

The first question is always the product itself. Pumping water is not the same as pumping glue, epoxy, tomato paste, or a strong acid—each has its own viscosity, density, and chemical behaviour.

Think through:

• Is the fluid thin, thick, or highly viscous?
• Is it neutral, corrosive, or solvent based?
• Does it contain solids or abrasives?

Husky pumps are available in both metal and plastic housings with different diaphragm, seat, and ball materials, so you can match the wetted parts to the fluid. A food slurry, a solvent borne coating, and sulfuric acid might all use Husky pumps—but with very different materials and internal components.

Clarify the application: what is the pump doing?

Next, define the actual job the pump performs. The same fluid can need very different setups depending on how it’s being used.

Ask yourself:

• Is the pump feeding another pump, a machine, or a spray system?
• Is it doing simple transfer from tank to tank?
• Is it unloading a truck or tote?
• Is it part of a potting, dosing, or metering application?
  

Applications that involve feeding downstream equipment can have tighter stability and pulsation requirements than simple transfer. Unloading and long distance transfer may need higher flow and more attention to suction conditions. Being clear on the role helps narrow down size and configuration right away.

Pipe size, flow, and where the pump sits

Husky AODD pumps move a lot of volume at relatively low pressure, which means pipe size and layout matter a lot.

Consider:

• Pipe diameter: Because discharge pressure is modest, you want pipe diameters as large as practical to keep pressure drop low. Don’t choke a large pump with small lines.
• Required volume: How many litres per minute (or gallons per minute) do you actually need for the process? That dictates pump size and line sizing.
• Pump position: Are you lifting the product (suction height), or is it flooded suction? How long are your suction and discharge hoses?

Long discharge runs introduce more pressure loss. High suction lift makes priming more challenging. Both factors can push you toward a larger Husky size to keep speeds down and reduce stress on diaphragms and check valves.

Duty cycle: intermittent or running around the clock?

How often and how long the pump runs has a direct impact on the size you should choose.

If the pump runs 24/7 or close to it, you generally don’t want it cycling at high speed all day. A better strategy is:

• Choose a larger Husky pump
• Run it at a lower cycle rate for the same flow
  

Yes, the pump is bigger and costs more upfront, but the lower stroke rate means less wear on packings, diaphragms, seats, and balls. Over time, that usually translates into lower maintenance cost and less downtime.

For intermittent service—short runs, batch transfer—smaller sizes at higher speeds can be just fine, as long as line sizing and air supply are correct.

Safety and environment: do you need ATEX?

If your pump will operate in a hazardous or potentially explosive atmosphere, you may need ATEX approved equipment.

ATEX certified Husky pumps are designed to operate safely in explosive environments when used as specified by the manufacturer. That means they won’t become an ignition source under normal operating conditions. If you’re working with flammable solvents, vapours, or dust in classified areas, make ATEX compliance a mandatory checkbox, not an afterthought.

Ball material: density matters for some fluids

Internal check balls are easy to overlook, but they are critical for proper suction and seating—especially with dense or challenging fluids.
For high density fluids like sulfuric acid, you typically want heavier balls such as Viton® or PTFE:

• Viton® is more expensive but denser and heavier, which improves suction lift and seating for heavy liquids.
• PTFE is also suitable and chemically resistant, though slightly less dense than Viton®.

In contrast, Santoprene® is lighter than water and will tend to float in many fluids. That makes it a poor choice for high density liquids and applications with significant suction height. Matching ball density to fluid density is essential when you’re asking the pump to pull product up several metres on the suction side.

Don’t ignore air consumption

Every AODD pump needs compressed air, and compressed air is not free. A Husky running hard can consume a lot of air—often hundreds of litres per minute in continuous operation.

Roughly:

• A continuously running pump can easily use on the order of 750–850 L/min of air.
• In real life, many applications are intermittent, so average consumption is lower—but still significant.
  

When you’re sizing and selecting, include air usage in your cost picture. Make sure your compressor has the capacity to support the pump plus everything else in the plant. Your compressor supplier can help choose the right compressor once they know your Husky’s air demand and duty cycle.

Need help sizing and specifying a Husky pump?

Choosing the right Husky AODD pump is about more than matching a catalogue flow number. You need to understand your fluid, application, line layout, duty cycle, safety requirements, and air system—and then map those to the right size and materials.

HMFT can help you:

• Review your process requirements and existing piping layout
• Match Husky pump size, housing, diaphragms, balls, and seats to your fluid
• Factor in duty cycle, air consumption, and any ATEX or safety requirements
• Build a clear, documented pump specification you can trust long term
  

If you’d like to talk through your application and get to a confident Husky selection instead of guessing from a chart, reach out to HMFT to schedule a pump sizing and selection review.