Intelligent Compressed Air: What You Need To Know About Deliquescent Dryers

Moisture free air is a “must” for industrial use, for a number of reasons:

  • An awful lot of distribution systems incorporate iron pipe. It’s inexpensive, readily available, easy to work with, rated for pressure, and has a long history of successful installations. Iron pipe will also oxidize (make rust) in the presence of water:
Here’s what we find a lot of the time inside a Reversible Drum Vac that’s been sent in for refurbishment because it’s not drawing effective vacuum anymore.
  • Regardless of what your distribution lines and components are made of, water droplets can erode them. Compressed air itself is a gas; it follows the curves in elbows, and flows around valve discs & regulator diaphragms. Water droplets, on the other hand, run full speed INTO those things, often at high velocity. This eventually causes pitting, which is bad enough…those pits, though, are little pockets for salts, acids, or alkalines to effect their destructive little chemical reactions.
  • When used for blow off applications, anything in your compressed air will get on anything you’re blowing off. If the intent is to remove moisture from a surface, moisture in your compressed air supply decidedly works against your goal.
  • Water can freeze as it is carried along with air flow through orifices. This can quickly block the flow of air. The US Navy lost a submarine, USS Thresher (SSN-593) and all hands in 1963. A number of factors contributed to the sinking, but a significant one was that compressed air being blown into the ballast tanks (to create negative buoyancy) had higher than permissible moisture content, and froze in orifice plates in the lines. The ballast tanks stayed full of water, and 129 sailors & shipyard personnel died as the boat passed crush depth.

There are a number of types of air dryers that are commonly fitted to industrial air compressors to take care of moisture problems. The least expensive one of these is the Single Tower Deliquescent Dryer. Here’s how they work:

Deliquescent dryer: how it works (1)
  • Incoming compressed air enters near the base, where a form of mechanical separation occurs…the air flows back & forth, around trays of desiccant.  The simple act of changing direction causes some of the water to just fall out and collect in the bottom.
  • The air then flows upwards through the desiccant bed. The desiccant in a deliquescent dryer absorbs moisture (as opposed to the adsorption that occurs in a regenerative desiccant dryer) until they get so wet, they dissolve.
  • After the desiccant does its job, moisture free air flows out the top, and gets on with it’s work.

In addition to the low price tag, other things to like about them are:

  • Low pressure drop.
  • No moving parts or electrical components.
  • Can be used outdoors, and in hazardous, mobile, dirty, or corrosive environments.

Of course, there are things to NOT like about them as well:

  • Limited suppression of dew point – because they are drying the air to a specific relative humidity, as opposed to a specific dew point, the attainable dew point is dependent on the incoming air temperature, the chemical composition of the desiccant salt, and the ambient temperature where it’s installed. Unless you use some sort of specialty salt desiccant, the typical dew point is only 20-25ºF lower than the air inlet temperature.
  • Desiccant carryover – speaking of those specialty salts, they’re even more corrosive than the basic sodium chloride that’s often used. Any carryover will wreak havoc on your distribution system and air operated devices.

Deliquescent dryers’ particular set of “pros and cons” presents challenges for their use in industrial settings, for sure. But if the primary concern is preventing pipes from freezing up, then their low cost, low maintenance, and simplicity make them a great choice.

At EXAIR Corporation, we’re keen on compressed air efficiency. The attention to detail we pay to our products – from design, to manufacturing & assembly, to availability, and right on through to technical support – bears out our commitment to helping you get the most out of your compressed air system. If you’ve got questions, we can talk about this all day long…and most of the time, we do. Give me a call.

Russ Bowman, CCASS

Application Engineer
EXAIR Corporation
Visit us on the Web
Follow me on Twitter
Like us on Facebook

Image courtesy of Brian S. Elliott, Wikimedia Commons Creative Commons Attribution-Share Alike 4.0 International License

The Case For The High Lift Reversible Drum Vac

If you need to fill -and empty – a drum with water, or water-like liquid quickly and easily, there’s really no quicker – or easier – way to do it than the EXAIR Reversible Drum Vac.  They’ve been around for decades, and are successfully used in a wide variety of applications.  The Reversible Drum Vac pulls a -96″H2O suction head on a 5, 30, 55, or 110 gallon drum, which makes it ideal for a number of typical Industrial Housekeeping or fluid handling applications.

EXAIR Reversible Drum Vac Systems come in a variety of sizes and configurations to meet the needs of most any application.

In cases where the liquid has a higher viscosity, or is below grade, the High Lift Reversible Drum Vac was developed with those exact situations in mind.  It generates a -180″H2O suction head, and comes with a 20ft vacuum hose.  Since its introduction, the High Lift Reversible Drum Vac has been successfully implemented in numerous uses where the extra suction head has been key:

  • A maker of bottled condiments (think barbecue sauce- or ketchup-like consistency) uses them to clean up accidents when bottles are overfilled, or a conveyor malfunction results in dispensing a bottle’s worth of condiment when there’s not a bottle under the nozzle.  The 20ft hose gives them the reach to service several production lines from one centrally located drum, and the two way pumping action allows them to easily pump the drum into their waste collection system.
  • A precast concrete company uses one for various cleanup applications.  The High Lift RDV‘s suction head is needed, in particular for their hydraulic oil leaks & spills.
  • A ferry operator uses one to clean out the engine room bilge.  They put the High Lift RDV on a deck above the engine room…the 20ft hose extends down to the bilge to pump it out, and when the drum is full, it reaches to the main deck so the drum can be emptied into their waste recycling company’s receptacle.
  • A construction company uses one to clean up the slurry created during concrete cutting operations.  The High Lift RDV is able to keep up with the slurry from even their largest saws, and the 20ft hose allows them to keep the drum conveniently out of the cutting area.

EXAIR High Lift Reversible Drum Vac Systems come in different configurations for 30, 55, or 110 gallon drums.

EXAIR Corporation has a variety of Industrial Vacuums to meet most any cleanup need.  They’re all compressed air operated, which means they have no electric motors to burn out, or moving parts to wear out.  If you’d like to find out more, give me a call.

***Order before 5/31/2021 and get a FREE Vac-u-Gun with any qualifying Industrial Vacuum System purchase***

Russ Bowman, CCASS

 

 

 

Application Engineer
EXAIR Corporation
Visit us on the Web
Follow me on Twitter
Like us on Facebook

Empty and Fill Machine Sumps with the Reversible Drum Vac Systems

EXAIR has a variety of Industrial Housekeeping products for your specific applications. Let’s explore the capabilities of our Reversible Drum Vac (RDV). The RDV is a safe, maintenance free system that is purpose built to recover liquids, oils sludge and chips from machine sumps. Since it is reversible, it will also fill your sumps from a fresh drum of machining fluids. This system does not require electricity and runs on compressed air. The RDV is maintenance free as it has no moving parts.

The RDV comes in 2 models which includes a “High Lift” version of the RDV and creates a maximum lift up to 15 feet of water column. The RDV comes in 4 capacities of 5, 30, 55 and 110 gallon drums while the High Lift comes in 30, 55 and 110 gallon drums. Let’s now focus on the RDV and the options for purchase.

The first thing to consider when purchasing your RDV is the capacity which I just mentioned of 5, 30, 55 and 110. Once you decided the capacity we have 3 models to choose. The Model 6196 is your basic model and comes with the vacuum unit, stand pipe, vacuum hose and aluminum wand. It is the basics of what you need to empty and fill your machine sumps.

The model 6296 is the same as the 6196 but also includes drum dolly, ABS spill recovery kit, tool holder and all tools.

The model 6396 is includes everything as describe with the Model 6296 but also includes the drum, drum dolly, upgrade to heavy duty aluminum tools, ABS spill recovery kit, tool holder and air hose.

Please visit our website www.ERXAIR.com to experience all of our products, videos, blogs and catalog information. I am happy to take your call or e-mail regarding any questions you have regarding our products, pricing and lead times.

Eric Kuhnash
Application Engineer
E-mail: EricKuhnash@exair.com
Twitter: Twitter: @EXAIR_EK

Industrial Housekeeping Promo: Free Vac-U-Gun

Are you in need of a new vacuum system or upgrade your new old system? Well now’s the time to do it! Starting March 1st, 2021 and running through May 31st, 2021, we are offering a free Vac-U-Gun system with any order of one of our Industrial Housekeeping Vacuum Systems. Our Vac-U-Gun system is a versatile tool that can help you clean up surfaces and transfer the material from point A to point B. The Vac-U-Gun can also be used as a powerful blow gun simply by unscrewing the generator and flipping it around. Best of all these units have no moving parts meaning they will run almost indefinitely and are maintenance free.

Vac-U-Gun System

Our industrial housekeeping products are designed to either handle dry solids or liquid.

If you need to handle solid material our Chip Vac system is the perfect choice. The system can handle both dry and damp material and transfer it into one of our standard open top steel drum (or use one of your own drums). If you are working with a heavier or abrasive material then look no further then the Heavy Duty Dry Vac which provides superior performance and abrasion resistance for use with materials as garnet, ground glass, blasting and tumbling media.

Chip Vac system From left to right: 5gal, 30gal, 55gal, 110gal

For your dustier applications we offer the Heavy Duty HEPA Vac system, which uses the same vacuum generator as the Heavy Duty Dry Vac but provides a higher level of filtration. The HEPA rated filter meets the requirements of 99.97% filtration at the 0.3 micron level.

Heavy Duty HEPA Vac system from left to right: 30gal, 55gal, 110gal

If liquids are what you need the Reversible Drum Vac system which can pump 55 gals in 90 secs is an good choice. The Reversible Drum Vac also comes in a High Lift version which can be used to pump liquids that have a much thicker viscosity and move liquids up to 15’ deep. When it comes filtering out solids from your liquid we also have the High Lift Chip Trapper and the Chip Trapper system. The Chip Trapper systems allow you to filter out solids suspended in the liquid; this is perfect for filtering out chips from your coolant tanks for machining.

Chip Trapper System from left to right: 30gal, 55gal, 110gal

If you need to clean up both liquids and solids, choose our new EasySwitch Wet-Dry Vac system. The EasySwitch allows you to easily switch the unit from being able to vacuum up solids to being able to suck up liquids (hence the name). All you have to do is remove the HEPA filter from the latch on the lid. There are no tools involved, no springs or cumbersome closures. Switch from liquids to dry materials in less than 15 seconds.

The New EasySwitch Wet-Dry Vac system

If you have any questions about compressed air systems or want more information on any of EXAIR’s products, give us a call, we have a team of Application Engineers ready to answer your questions and recommend a solution for your applications.

Link to our Promotion Page

Cody Biehle
Application Engineer
EXAIR Corporation
Visit us on the Web
Follow me on Twitter
Like us on Facebook