Undersized Plumbing Creates a Performance Problem

Sometimes we get calls or emails from our customers experiencing a problem with their application already using EXAIR products.  These calls can range from difficulties associated with installation angle, installation, or, in many cases, the compressed air plumbing to the product itself.

That was the case in the application of the photos above.  The end user had been using our model 6084 Line Vac to move plastic pellets from the floor to the top of a machine hopper, and they needed to increase the flow.  The problem, was that they weren’t getting the performance from the 6084 that they thought they should.

Chip Vacuum 1
                                                                 EXAIR model 6084 Line Vac used for conveying plastic pellets


Chip Vacuum 2
Model 6084 Line Vac used to convey plastic pellets from the floor to the top of a machine hopper


Given the bulk density of the plastic pellets in this application, the end user should’ve been able to move more than enough material in the time they desired for the application needs.  But, instead, the Line Vac was moving little-to-no material and even “stalling” – a condition in which the conveyed material could enter into the Line Vac and then cease to convey.

What we found, after exchanging contact information and discussing the photos above, is that the compressed air line feeding the Line Vac is too small, creating a pressure drop and leading to an inadequate compressed air flow.  This, in turn, leads to lower air velocity at the exhaust of the Line Vac, which simultaneously means lower vacuum and material flow at the inlet.

The end result is the condition described by the end user – a low flow, or no-flow, of the material being conveyed.

After our discussion the end user set out to make the required change to the supply line, providing proper flow to the Line Vac at the proper pressure, and moving the material as required.

It’s always rewarding to help an end user solve their problems.  If you have an application problem and think EXAIR might be able to help, contact an EXAIR Application Engineer.

Lee Evans
Application Engineer

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