The Rate Is Right?

This morning, we played our own little version of a popular segment of the game show “The Price Is Right,” right here in the Application Engineering department. Brian Farno (our manager and host extraordinaire) presented us with a question (that he already knew the answer to after speaking with a current customer):

What would you expect the conveyance rate to be, for an EXAIR Model 6083 1-1/2” Aluminum Line Vac, conveying hot-melt glue pellets, across a total distance of 15 feet vertically & 100 feet horizontally? (And please note we normally have a bulk density in lbs./ft3 and/or other associated information about pipe bends, product shape etc. – but we took our best shot at it anyway).

Our office doesn't look like this.  I kinda wish it did, though...
Our office doesn’t look like this. I kinda wish it did, though…

We didn’t have those cool podiums to stand behind that recorded our answers on the screen, but here’s what we came up with:

Russ Bowman: 5 lbs per minute
Dave Woerner: 10 lbs per minute
Justin Nicholl: 8 lbs per minute
Professor Penurious: 1 lb per minute (Insert $1 bid joke here)

Now, we had all referenced our wealth of data charts for conveyance rates with our Line Vac product series. We used several very different materials over a few different lengths/heights, and use that data to estimate what a user might expect to see, based on how close their application is to our actual test conditions. I actually used this data for my answer – a 1-1/2” Aluminum Line Vac conveyed tumbling media (64 lbs/cu ft; the lowest bulk density material we tested for) at a rate of about 5-1/2 lbs/minute, going 20 feet vertically.

Left: hot-melt glue pellets.  Right: tumbling media
Left: hot-melt glue pellets. Right: tumbling media

Turns out, Dave came the closest without going over: they were actually getting a little over 11 lbs per minute…again, going 15 feet up and 100 feet over. The user was so pleased with the results, they’re incorporating a Line Vac in a similar application, involving hot-melt glue pillows. We’ve now added their data to our database and are pleased with the knew knowledge.

If you have an application involving hopper loading, bulk material conveying, chip removal, parts transfer, etc., and would like to find out how an EXAIR Line Vac can help, give me a call. We might both be impressed with the results. Come on down!

Professor Penurious, by the way, is still concentrating on hosting the game shows.  Stay tuned…

Russ Bowman
Application Engineer
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Floating Plates With Compressed Air

Yesterday, I had the opportunity to work with a customer who was familiar with our product and was looking to roll out EXAIR’s Super Air Nozzle in various parts of the plant. Before purchasing our products, the customer was using (4) open 5/16″ aluminum tubing to move or “float” a 12 inches by 12 inches plate of aluminum. This plate is .187 inches thick and needed to be moved six inches against the wall of their conveyor. The (4) open tubes moved the plate, but the customer had some safety concerns. First, the open pipes violated the OSHA standard 1910.242(b) that any open pipe that can be dead ended must only be pressurized to 30 PSIG. Second, to move the plate successfully the shop pressure needed increase to 100 PSIG which increases the amount of load on the compressor and could lead to higher maintenance in the future. Finally, the noise level of open pipes was well over 110 dBA which was another OSHA violation.


Considering all of these problems the customer contacted me, looking for an air nozzle to use instead of the open pipe. After a short discussion we decided to try (3) HP 1125 nozzles. Once the customer installed the air nozzles, they only used 2 of the air nozzles, and they were able to move the plate easily across the conveyor. This netted them several key results. The most noticeable at the plant was how quiet the operation became. Instead of dealing with noise levels in excess of 110 dBa (which is equivalent to the noise level of a turbo-fan aircraft at take off)  the HP1125 comes in at 83 dBA which is roughly the noise of a milling machine.  This was much more pleasant to the operator and any plant passersby.  The most important was the operation now complied with OSHA safety requirement of 1910.242(b).  Because of the width of the Flat Nozzle and the overhang of the cap, the nozzle can not be dead ended.  Since the unit can not be dead ended, pressure above 30 PSIG can be safely used.  Finally, the most economically result was that the air savings for the units.

The 5/16 tube had an ID of .183 and was 18″ long. When supplying it with 100 PSIG of compressed air, it will flow 22.8 SCFM of compressed air, so the customer was using 91.3 SCFM. The HP1125 nozzle uses 37 SCFM at 80 PSIG, so they were able to use 74 SCFM, which means each minute they were using 17.3 fewer cubic feet. At a cost of $0.25 per 1,000 Cubic feet, the HP1125 saved $0.26 per hour or $6.23 per day or $1,557 per year with 250 working days.

Replacing (4) open tubes with (2) HP1125 Flat Super saved $1,557 per year in compressed air savings, an OSHA violation, employees hearing, and lowered the system pressure from 100 psi to 80 psi.  Needless to say the customer was sold on the benefits on our products, and is looking for any more open pipes in his facility.

Dave Woerner
Application Engineer