Proper Plumbing Makes Full Flow Air Knives Operational

Full Flow Air Knives for plate drying
These EXAIR Full Flow Air Knives were in need of an EXAIR Application Engineer’s expertise

Sometimes we get calls or emails from our customers that need help.  Help can be in the form of product selection, heat load calculation, or proper installation.  I had one such interaction with an end user of our Full Flow Air Knives, using them in the manner shown above.

The problem they were having was poor flow and low force from the blow off.  We originally discussed the application over the phone, and after suspecting a plumbing issue may be at play, I asked for a photo.  I received a quick photo of their setup and immediately saw the two knives were poorly plumbed.  The clear/light blue hose, and the dark blue hoses in the photo just aren’t big enough for two knives of this size.

When installing any compressed air driven product, pressure and flow are the name of the game.  Sometimes, as in this case, there was good pressure at the gauge (which, if checked at the inlet of the knife would have shown a significant pressure drop), but there just wasn’t enough flow.  The root cause was diameter of the piping used to deliver the air from the main line to the point of use.

Once the compressed air line sizes were increased, the knives worked flawlessly and the end user could use them as intended – which was blowing debris off of a plate fed through the middle of the two knives.

If you have an application that you think may have a plumbing concern, or any other need for EXAIR products, contact an EXAIR Application Engineer.  We’ll be happy to help.

Lee Evans
Application Engineer

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