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AODD Configurator

AODD Configurator

Water treatment sector

19 September 2019

The water treatment sector is one of the most difficult areas in which to work, due to the severe working conditions of the pumps.

Fluids with the following specifications are often treated:

  • extreme pH balances, both low and high
  • high density and viscosity
  • high concentration of suspended solids and abrasiveness
  • presence of debris of a size that cannot be overlooked
  • presence of solid filaments

Debem has been working in this field for more than thirty years and has acquired a wealth of experience in this sector which is reflected in the design of pumps ideal for usage.

Which pumps does Debem recommend?

CENTRIFUGAL PUMPS (MB, DM and IM Series – see https://www.debem.com/prod/electric-centrifugal-pumps/)

The fluid needs to be cleaned well to use these kinds of pumps.

Proposals in polypropylene and PVDF have nothing to fear from acidic or basic environments.

AODD PUMPS (see https://www.debem.com/prod/air-operated-double-diaphragm-pumps/)

The way they function allows for an all-round usage in this sector.

  • Acidic or basic corrosive fluids

Debem recommends plastic materials such as polypropylene and PVDF or metallic ones like aluminium or AISI 316L stainless steel, thus covering all the different kinds of applications.

The internal parts in contact with the fluid (membrane, balls, ball seats and O-rings) can then be configured in a vast range of these and other materials.

  • Viscous and high density fluids, start-ups from dry

The operating principle (see https://www.debem.com/operation-diaphragm-pumps/ and https://www.debem.com/alternating-volumetric-pumps/) allows fluids whose viscosity and density by far surpass those of water, to be treated.

In practise, they are similar to plunger volumetric pumps.

The positive side of these kind of pumps is their operating capacity even from dry: often when the pump and system are starting up, the pump needs to be triggered by an empty suction hose; this is not a problem and the considerable effort of the membrane is alleviated by the “Long-Life” Debem profile.

  • Fluids with a high concentration of suspended solids

Debem offers the possibility of configuring AODD pumps to provide particular resistance to abrasion, thanks to the variety of materials it makes use of.

  • Fluids with debris and filaments

The intrinsic function of the AODD pumps allows for fluids with suspended solids to be transferred: the balls with their alternating movement, leave room for solids whose size depends solely on the dimension of the pump in question.

Generally, this involves small-large sizes which allow solids to pass with an average diameter ranging between 4 and 10 mm.

On the subject of this, in 2018, Debem developed a new AODD pump model whose main circuit made up of ball seats, balls and cages is replaced by a flap circuit (with flap valves) placed horizontally.

This is the new FullFlow. For further info: https://www.debem.com/products/fullflow-502/

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