Non-Hazardous Purge Cabinet Cooler Solves Two Problems At Once

Electrical control panel above belt press machine

The image above shows an electrical panel located over a belt press machine.  Belt press machines can be used in a variety of mechanical separation applications, from juice manufacturing to de-watering of grains, and even algae extraction.  The use in this application, however, was to assist in the removal of liquid from styrene via multiple “wedge zones” which force the styrene between an upper and lower belt, applying increasing pressure and forcing the liquid from the styrene roll.

The Plant Manager of the facility which uses this cabinet contacted EXAIR in search of a solution to provide cooling for this enclosure, and wanted to know if we could also provide some means to provide a constant ventilation as well.  We discussed the merits of the Cabinet Cooler in terms of cooling power, and also discussed our Non-Hazardous Purge Cabinet Cooler systems which provide a constant feed of 1 SCFM of compressed air into an enclosure.  This slight airflow into the cabinet provides a slight positive pressure which further helps to prevent any dust from entering the cabinet.  For older cabinets with potentially weakened seals, these systems can provide an added level of protection against harmful dust in the ambient environment.

After sending a Cabinet Cooler Sizing Guide and determining the proper model number (NHP4825), the customer asked about lead time.  They said that the machine was intermittently shutting down and they needed something FAST.  I informed them that EXAIR Cabinet Coolers ship from stock and we can even ship UPS Next Day Air if need be.

Knowledgeable engineering support coupled with a shoe-in solution and on-the-shelf availability got this application under control quickly.  If you’re having a similar experience with your electrical control panels, contact EXAIR’s Application Engineering department for a similar solution experience.

Lee Evans
Application Engineer

Digital Flowmeter Improves Production Scheduling And Upgrade Budgeting

“You can’t manage what you can’t measure” might be the most popular axiom in any process improvement endeavor. And it’s true. We hear it almost every time we discuss a Digital Flowmeter application, and a conversation I just had with a customer was no exception.

Their business is growing, and they’re pushing the limits of their compressed air system. The use compressed air to run their CNC mills in their machine shop, for blow off/cleaning as they assemble products, as well as a variety of pneumatic tools throughout the shop. The CNC machines’ air load was pretty consistent…the rest of the shop; not so much. So they wanted to find out when their compressed air demand peaked, and what it peaked at, in order to make a more informed decision about upgrading their compressor.

From your Digital Flowmeter to your computer screen, the USB Data Logger tells you how much air you’re using…and when you’re using it!

So, they purchased a Model 9095-DAT Digital Flowmeter for 2″ SCH40 Pipe, with USB Data Logger. They installed it immediately, with the USB Data Logger set to record once a second…this told them their consumption at any given time over the course of the day. Every day at closing time, the shop manager pulls the USB Data Logger from the Digital Flowmeter and transfers the data to his computer. After just a few days, he knew exactly how much air they were using…and exactly when they were using it. He’s now using this data (in the short term) to plan certain operations around peak scheduling, and (in the long term) to know what they’re looking at for their next air compressor.

Do you know as much about your compressed air usage as you should? If you’d like to talk about how to measure…and manage…your air consumption, give me a call.

Russ Bowman
Application Engineer
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Two Birds With One Stone (and A Shim)

Blowing off bottles is such a popular application for the EXAIR Super Air Knife, it’s been featured on the cover of our Catalog…several times…and is the “banner” pictures on the Super Air Knives page on our website:

This always makes me thirsty for orange soda.

I had the pleasure of helping a caller from a bottling plant recently with just such an application.  Thing is, they run a couple of different size bottles, and it’s not a very big facility…they didn’t want to, or have room to, install different lengths of Air Knives, and also didn’t want to waste air flow when they were running the shorter bottles.

9″ Air Knives were required for the taller bottles, but their shorter bottles were a little under 6″ tall.  They had considered buying both 6″ and 9″ Air Knives, but called me to see if there was a less expensive, and possibly, easier way.  (There is!)

EXAIR makes, and stocks, every product in our 208 page catalog right here in this building in Cincinnati, Ohio.  We also make custom parts when the need arises…and custom Air Knife shims were the solution to this customer’s application.

By installing two Model 110009 9″ Aluminum Super Air Knives, one on either side of the conveyor (just like the photo above,) they’re able to blow off the taller bottles.  When they run the shorter bottles, they change out the shims for ones that limit the flow to a 6″ curtain.

So…for a little under $50.00 (2017 cost for those custom shims,) they’re going to save almost $550.00 per year in compressed air costs – AND make sure that their compressed air system is optimized & available for other loads throughout the plant.

EXAIR offers the Super Air Knife in lengths from 3″ to 108″, with a 0.002″ shim installed.  They’re ideal for most industrial and commercial blow off applications, right out of the package.  If your application calls for something a little “outside the box,” you may only be a shim away from success.  If you have such an application, give me a call.

Russ Bowman
Application Engineer
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Pneumatically Conveying Corn Flakes From Large Sacks Using An EXAIR Line Vac

This workspace needs a pneumatic conveyance solution.

I’ve had a string of great Line Vac applications which I’ve been able to write about recently.  Using our Heavy Duty Line Vac to convey small particles, vacuuming alumina dust two applications in the same plant, and removing chips from a plastic CNC router.  But, the application for this blog is a bit different because it involved conveyance of a material to prevent worker fatigue.

Dried corn flakes in super sack.

The dried flakes shown above needed a reliable method to convey between the large sacks in which they’re delivered and the boilers into which they need to be added.  The existing operation has been to have personnel cut open the bags and pour them into the boilers, but this method is taxing for the workers and results in significant fatigue throughout the day as well as spillage around the boilers.  This facility needed a better way to move the corn flakes that was small enough to fit within the confined workspace and capable of quickly emptying the sacks over a distance of ~6.5 ft.

The corn flakes need to be conveyed from the sacks on the right to the boilers on the left.

This customer requested that the solution be made of 316 grade stainless steel, and that implementation and use be as simple as possible.  With a bulk density of ~40 pounds/cubic foot, and merely a desire to move the material as fast as possible over this short distance, I directed them toward our 3” Stainless Steel Line Vac made of 316SS.  To increase the conveyance in the application I also offered our service to convert our standard model 6066-316 Line Vac to a “High Power” unit by increasing the size of the generator holes.

Both of these solutions were deemed as viable because they both allow for fast emptying of the bags (we estimated between 1-2 minutes to completely empty a bag), little-to-no spillage, and far, far less fatigue on the workers in this area (the key driver for searching out a new method of material transfer.

The potential model numbers were presented to management for a purchasing decision.  As this project moves forward, and even after the solution is installed, we’ll be available for product assistance and engineering support.  If you have an application in need of a viable pneumatic conveyor, contact EXAIR.  We’ll be happy to explore the application and offer any potential solutions.

Lee Evans
Application Engineer

EXAIR Cabinet Cooler Systems Vs. Refrigerant-Based Panel Cooling Options

If you’ve got an electrical enclosure that needs heat protection, you’ve got a good number of options at your disposal. Frankly, if any one of them were the “be-all and end-all” solution, the rest of us would be looking for something else to do. Fact is, there are certain situations where one particular method makes more sense than the others, and other situations where one method just won’t work but several others will.

In industrial and commercial settings, these situations will often present conditions where there is indeed an ideal solution. Today, we’ll explore the ones where the choice comes down to a compressed air-operated EXAIR Cabinet Cooler System or refrigerant-based panel cooling.  Let’s consider:

Environment – Now, we’re all going to make sure we protect our gear from the elements, as much as is humanly possible. Your company’s computer server is likely a lot closer to the climate controlled office spaces than the welding or grinding stations. But what happens when sensitive electronics need to be in close proximity to the machinery they’re controlling? And that machinery isn’t in climate controlled office spaces?

EXAIR NEMA 4 Cabinet Cooler System on an enclosure in a hot steel mill.

Even if an A/C type panel cooler would fit on this box, it would be problematic:

  • See all that dust on the ducts? And the belt? And the rails? And the…well, everywhere? Yeah; would be in the filters, condenser coils, the compressor motor bearings and eventually, inside the panel.
  • They make condensate. The big thing about air conditioners is that they lower the humidity…and that water has to go somewhere. Even if a small drain line is easy enough to run, what happens when it gets clogged (that dust is going to find its way here too, by the way)?
  • They’re sensitive to vibration. Every fastener, every brazed joint, every electrical connection, risks cyclical failure if they’re shaken about.

EXAIR Cabinet Cooler Systems are impervious to all of these conditions:

  • The only air they use comes straight from your compressed air supply. We even provide Automatic Drain Filter Separators to make sure this is clean & dry.
  • There are no moving parts. Vibration is not a problem.
  • We offer different levels environmental considerations to meet most any challenge:
    *NEMA 12 (dust tight, oil tight) are ideal for general industrial environments.
    *NEMA 4 (splash resistant) keep liquids out too, and are indoor/outdoor rated.
    *NEMA 4X (corrosion resistant) also keep liquids out, and are stainless steel construction. They’re also available in 316SS construction for the most exacting, harshest, and critical environments such as food service, pharmaceutical, or highly corrosive atmospheres.
    *High Temperature Cabinet Cooler Systems are specified for installation in areas where ambient temperatures exceed 120°F (52°C.)

Location – Sometimes, there’s just not room to mount an air conditioner. The compressor, and, especially, the condenser coils have to take up a finite amount of space, by design.

When there’s no room to use a bulky air conditioner, a compact EXAIR Cabinet Cooler System is ideal.

EXAIR Cabinet Cooler Systems have a small footprint…a NEMA 12 550 Btu/hr system, for example, installs through a ½ NPS knockout, is under 6” tall, and just over 1” in diameter.

Reliability – We talk to callers all the time about the frustration of:

  • Having to replace a burned out Variable Frequency Drive because their panel cooler failed.
  • Constantly resetting controls that have tripped due to an overheat condition because they missed, or don’t have time for, their panel cooler’s maintenance.
  • Down time and lost production while waiting for replacement parts…or a whole new panel cooler.

Even in less aggressive environments, filters and coils can slowly accumulate dirty buildup, which reduces the unit’s cooling power.  Then, a heat wave hits early in the season, and your machine trips out (if you’re lucky) or burns out (if you’re not) -either way, that part or process you were in the middle of is scrap, and you’re back to step one.

EXAIR Cabinet Cooler Systems are not affected by this – in fact, a system with thermostat control may just sit there dormant through the winter, and “spring” (pun intended) into action when that first heat wave rolls through.  And it’ll be just as powerful as that last hot day, the previous autumn.

Availability – Let’s say you installed some new equipment recently, and its first exposure to the heat of summer created one of the frustrating situations above.  An air conditioner-type panel cooler will require:

  • “Invasive surgery” on your enclosure. Most of these require a sizeable rectangular hole for installation.
  • These systems can pull 5 amps or more, which might mean a dedicated circuit breaker & wiring.
  • Many are built-to-order, so you might have to wait, depending on their assembly schedule.  And they might be busy, because if the heat just started causing you problems, you’re probably not the only one.
  • Once it’s received, installed, and wired up, you may still have to wait for the compressor’s oil (special oil for use with refrigerant) to settle before you start it up the first time.

EXAIR Cabinet Cooler Systems are stock products.  We ship same day, across the country, with orders received by 3pm EST.  They install in minutes, and most of the preparation can be done today, so you’re ready to install when it comes in tomorrow – which isn’t a big deal…most Cabinet Cooler Systems weigh only 5lbs or less, so expedited shipping isn’t near as painful to your wallet as a big box full of electric motor, copper coil, and refrigerant.

Environment (friendly, that is) – No matter how well they’re built, a refrigerant system is going to leak sooner or later.  And every whiff through an aging seal, or sudden loss through a failed tube, will contribute to the ozone depletion that today’s strict controls and high attention to CFC’s are trying to prevent.

Our Cabinet Cooler Systems are solely compressed air operated…the only thing they exhaust is the air from inside the enclosure.

Durability – Refrigerant leaks. Electric motors wear out.  Coils corrode.  Filters clog.  A GOOD warranty on an air conditioning type panel cooler is two years.  And it won’t cover environmental effects.

All EXAIR Compressed Air Products have a Five Year Built To Last Warranty.  But if you supply your Cabinet Cooler System with clean, dry air, it’s going to run darn near indefinitely, maintenance free.

Don’t trust your critical electronics to anything less than the assurance provided by an EXAIR Cabinet Cooler System. If you’d like to find out which one(s) are right for your needs, give me a call.

Russ Bowman
Application Engineer
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EXAIR Vortex Tubes: As Much Cold Air As You Need, As Cold As You Need It

If you’re looking for a reliable, consistent flow of cold air, there’s really no better way to produce it than with a Vortex Tube. There are no moving parts…the air flow and temperature from a particular model, set to a specific cold fraction, is only influenced by the compressed air supply pressure & temperature.

Pressure is easy to control…all you need is a suitable regulator.  Temperature CAN be a variable, depending on your type of compressor, if you have a dryer system (and what type it is,) and sometimes, ambient conditions…if, for example, a long pipe is run through a very hot environment like a foundry or a blast furnace operation.  In cases where supply pressure and/or temperature can be limitations, a higher capacity Vortex Tube, set to a lower Cold Fraction, may be specified.  Which brings me to the user inquiry that inspired today’s blog…

This particular customer uses our Model 3215 Vortex Tubes (15 SCFM, 1,000 Btu/hr) to provide cooling to analyzer systems that monitor certain quality parameters in their manufacturing processes.  The ability to precisely control the temperature in these systems makes for repeatable and accurate measurement of these parameters.   Their compressed air supply in this area is regulated to 80psig, they have a refrigerant-type dryer and climate-controlled facility, so their supply temperature is a consistent 70°F.  You couldn’t ask for better conditions for a successful Vortex Tube application, and they’ve worked great, for years.

Now, due to a plant expansion, they’re installing some of these analyzer systems in a location where the compressed air supply is limited to 60psig.  The required cooling capacity is going to be the same, so the Project Manager reached out to us to see if they could get the same amount of cooling with this new pressure limitation.  Here’s how they’re doing it:

We publish the rated performance of Vortex Tube products for a supply pressure of 100psig.  The Model 3215 Vortex Tube consumes 15 SCFM @100psig and, when set to an 80% Cold Fraction (meaning 80%…or 12 SCFM…of the 15 SCFM supply is directed to the cold end,) the cold air will be 54F colder than the compressed air supply temperature.  Here’s the performance table, so you can follow along:

EXAIR Vortex Tube Performance Table

Now, their supply is at 80psig.  Since air consumption is directly proportional to absolute supply pressure (gauge pressure PLUS atmospheric, which is 14.7psi at sea level,) we can calculate their units’ consumption as follows:

(80psig + 14.7psia) ÷ (100psig + 14.7psia) = 0.83 X 15 SCFM (@100psig) = 12.4 SCFM (@80psig)

So, with a 50°F temperature drop (from a supply @70°F,) they were getting 12.4 SCFM of cold air at 20°F.

As you can see from the table above, they’ll only get a 46°F drop at 60psig…and the flow won’t be as high, either.  So…we’ll need to get more air through the Vortex Tube, right?  Let’s use a little math to solve for what we need.

We still need 20°F cold air from 70°F compressed air, so, at 60psig, we’re looking at a Cold Fraction of ~70%.  And we still need 12.4 SCFM, so:

12.4 SCFM ÷ 0.7 = 17.7 SCFM @60psig (required supply)

Our Model 3230 Vortex Tube uses 30 SCFM @10opsig…at 60psig it’ll consume:

(60psig + 14.7psia) ÷ (100psig + 14.7psia) = 0.65 X 30 SCFM (@100psig) = 19.5 SCFM (@60psig)

That’s about 10% more flow than they needed, theoretically, which was close enough to start.  From there, they “dialed in” performance by regulating the supply pressure and Cold Fraction (see video, below):

If you’d like to find out more, or work through a cooling application, give me a call.

Russ Bowman
Application Engineer
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How Do I Estimate The Cost Of My Compressed Air?

Saving Money and Compressed Air

One of the best features of EXAIR products is the engineering behind the designs.  For example, our nozzles are designed to generate a maximum force possible per CFM of compressed air.  This means that the compressed air consumed by the device is at its maximum possible efficiency, which in turn reduces the compressed air demand in an application, reducing the cost of the solution.

But, how do you determine the cost of a compressed air driven product?

Step 1 – Quantify flow

The first step to determine compressed air cost is to quantify the flow rate of the product.  Most pneumatic equipment will have a spec sheet which you can reference to determine air consumption, but open pipe blowoffs and drilled holes won’t provide this type of information.  In those cases, or in any case where the compressed air flow is unknown or questionable, a compressed air flow meter can be used.  (We have Digital Flowmeters for use on compressed air piping, with or without data logging capability, and with serial or wireless communication.)

Step 2 – Calculate flow over time

Once the flow rate is known, it’s time to determine flow rates per day/week/month/year.  To do so, we will perform a bit of short and easy math.  What we will do, is use the known flow rate of the device, and multiply this by the total time in operation to determine daily, weekly, monthly, and annual usage rates.  For example:

A 1/8” open pipe blowoff will consume 70 SCFM.  In an 8 hour shift there are 480 minutes, resulting in a total consumption of 33,600 SCFM per 8 hour shift.

Step 3 – Determine cost

With a quantified flow rate, we can now determine the cost.  Many facilities will know the cost of their compressed air per CFM, but for those which don’t, a cost of ($0.25/1000 standard cubic feet) can be used.  This value is then multiplied by the total compressed air consumption from above, to give a quantified dollar amount to the compressed air driven device.

Using the flow rate from above:

If (1) shift is run per day, 5 days per week and 52 weeks per year, this open pipe blowoff will have an annual cost of $2,184.00.

Step 4 – Compare

At this point we know the real cost of the device.  The benefit to quantifying these flow rates, is when making a comparison to an alternative such as an engineered solution.  For example, if we were to replace the open pipe blowoff reference above with an EXAIR 1010SS 1/8” NPT nozzle, the compressed air demand would drop to 13 SCFM, yielding the following flow rates and costs:

If (1) shift is run per day, 5 days per week and 52 weeks per year, this open pipe blowoff will have an annual cost of $405.60.

Comparing these two solutions on an annual basis yields a difference of $1,778.40.  This means an air savings which correlates to $1,778.40 per year – just by replacing ONE open pipe blowoff with an engineered solution.  Replacing multiple open pipe blowoffs will yield repeat savings.

The 1010SS EXAIR Micro Air Nozzle

Determining the cost of a compressed air driven device can clarify the impact of a truly engineered solution.  If you have an interest in determining the cost of the compressed air devices in your facility, contact an EXAIR Application Engineer.  We’ll be happy to help.


Lee Evans
Application Engineer

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