High Temperature Application Needs High Temperature Filtration

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Two 42″ stainless steel Super Air Knives in need of proper filtration of the compressed air supply

In an undisclosed application, two 42” stainless steel Super Air Knives (shown above) are positioned to provide a needed blowoff function.  The exact purpose of the blowoff wasn’t revealed, but this OEM requested various shims for these knives along with suitable filtration.  Shims, which can be field installed into the knife to adjust the air gap and air flow due to different thicknesses, will directly affect the volume of air and force out of the knife. Determining model numbers and pricing for the requested shims is straightforward, but providing the required filtration proved to be a bit more challenging.

Whenever considering filtration, the first step in product selection is to consider what needs to be filtered from the air; for example, water, dirt, or oil.  This customer needed a method to remove both water and dirt, as well as oil particulate from the compressed air.

The next step is to consider the potential greatest flow (required by the knives) through the filters, which, in turn, requires having knowledge of the intended operating pressure for the application and the air gap set by the shims.  These knives are to be operated at a maximum pressure of 87 PSIG, creating a maximum flow potential of about 260-520 SCFM depending on the chosen shim.  (3.1 SCFM per inch of length for each knife when operating at 87 PSIG * 42 inches per knife * 2 knives = ~260 SCFM;  6.2 SCFM per inch of length for each knife when operating at 87 PSIG and having the additional shims installed * 42 inches per knife * 2 knives = ~520 SCFM)

Lastly, we have to give consideration to the environment into which the filters will be installed.  For example, will the filters be exposed to any kind of wash-down process using specific chemicals; and, what is the ambient temperature in the environment?  The purpose of these questions is to uncover any environmental specifications or limitations.

In this application, those questions uncovered a need to place these filters into a hot environment with temperatures up to 300°F.  Given that our stock filter options have maximum operating temperatures of 120°F, we needed to explore an application-specific solution.

So, the Engineering team at EXAIR sprung into gear to find a suitable, high temperature option, which we in turn presented to the OEM user, offering a specific solution for their specific application.  The high temperature filters for this application are suitable for temperatures up to 450°F with flow rates as high as 600 SCFM at 100 PSIG – a perfect fit!

If you have application-specific needs, we’re happy to discuss and brainstorm potential solutions.

Lee Evans
Application Engineer
LeeEvans@EXAIR.com
@EXAIR_LE

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