Air Operated Double Diaphragm Pump: Frequently Asked Questions

Air Operated Diaphragm Pumps are a common choice of pump in factories, but before you make your choice, we want to run you through the benefits and downsides of owning a Diaphragm Pump, to ensure you know what you're getting! Keep reading to find out more.

What are the benefits of using a Diaphragm Pump?

Air Operated Double Diaphragm Pumps (AODD) have a huge list of benefits over electric centrifugal style pumps.

  • - The first and most relevant benefit of using a Diaphragm Pump would be the versatility of the pump. Air Operated Double Diaphragm Pumps have no BEP (Best Efficiency Point) and do not experience any adverse effects when operated at different flows and pressures. In short, one pump can do a lot of flows and pressures without damaging the pump.
  • - "AODD pumps can be abused." This is a statement you may hear often in a busy factory and it does carry some truth; you can run Air Operated Diaphragm Pumps dry for extended periods of time, they can be dropped, switched on and off and they do have solid handling capabilities, which makes AODD's the perfect choice for many factories. However, just because you can abuse them doesn't mean you shouldn't take care of them!
  • - Another great benefit of using a Diaphragm Pump is that they are all self-priming, most of them up to 9 meters wet! Self-priming means the pump will actually lift media up out of a holding tank, through the pump and onward.

Are there any downsides to using a Diaphragm Pump?

As good as the pumps are, they do have some operational downsides, a few of which are listed below.

  • - Compressed air is one of the most expensive ways to power a pump, meaning that air pumps cost a hefty amount of money to run.

If this is one of your biggest worries about purchasing a Diaphragm Pump, you should take a look at our article, 'Are Your Diaphragm Pumps Costing You Too Much?' Tapflo have got the answer to help reduce your reservations surrounding Air Pumps.

  • - Air pumps are also noisy when running at high pressures.
  • - The flow of air pumps is very uneven and can only be fixed with a pulsation dampener.

What is the maximum viscosity of media an Air Operated Double Diaphragm Pump can pump?

The maximum viscosity that most AODD pumps can handle is 15,000 CPS, at this point the max flow is as little as 20% of the nominal flow on water. It is always advised that when pumping products over 2,000 CPS, you ensure it’s a flooded suction to assist with the flow rate.

What different types of applications can I use an Air Operated Double Diaphragm Pump for?

AODD pumps can come in Plastic, Stainless, Cast Iron, Aluminium and Sanitary Formats. This opens up lots of applications and media types that you can pump with an AODD pump. With ATEX, FDA, EHEDGE cert available there is an air pump for all requirements.

You can also use Diaphragm Pumps for tank emptying in place of a Submersible Pump. Not sure how this is possible? Have a read of our article, 'Should I be using a Submersible Pump or an Air Pump?'

Case Study

A customer contacted Tapflo looking for 10 Diaphragm Pumps urgently; the only spec provided was as below.

Application Details:

Quantity: 10

Capacity: 500 l/hr

Head: 6m vertical + 100m horizontal

AOD pumps need to handle site run off water discharging to central storage tank. The water is mainly rainwater but could be contaminated, so Polypropylene/Viton has been requested.

Pump Offered: T50 PTT

½” HDPE with PTFE Internals

55LPM Max

8 Bar Max Pressure

The pump was supplied with 10 x Tapflo Filter Install Kits for controlling speed and ensuring clean dry air is put into the pump. An order was placed a week after the enquiry was made, beating a number of other suppliers to the punch.

If you require an Air Operated Double Diaphragm Pump or any other pump, or need assistance in choosing the best product, don't hesitate to give us a call on 023 8025 2325 or email us on [email protected]

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