Tag: dust

SHOCKING! One Project Leads To Another

Published on by Brian FarnoLeave a comment

Here at EXAIR, we always have a promotion going. At this time of year, static electricity is running rampant due to the low moisture content in the air. This is easily seen in my garage, where I currently have several projects going. One of which includes a 1″ thick piece of rigid foam insulation, and another part of that same project includes about 10 sheets of drywall.

The main wall that started the project.
Before, there wasn’t even a frame there.

That project, finishing a basement area, also included making some plywood built-ins. Well, if you have ever cut plywood, then you know it can be quite dusty. Put that in a small space and just the dust floating in the air during these dry months resulted in the sheet of rigid foam which was standing up away from the cutting area now holding a nice layer of fine dust to the surface. This dust was all attracted to the surface by the static charge. The charge on the surface was ramped up from the movement to get it into the garage from the store, with lots of friction, attachment, and detachment. I could definitely benefit from something like the Gen4 Ion Air Gun to blow down the sheet and remove anything on the surface before I take it into the house for the project.

I made one cut on a sheet of plywood about 8 feet away from this foam insulation sheet. All the light-colored areas are sawdust that is now hanging on the surface.

Well, if I were to order the Gen4 Ion Air Gun Kit through the current EXAIR promotion, I would also be receiving a free A/C Sensor pen which I could have used to help me trace where voltage is present in our dryer, which decided to break in the middle of the basement project. Luckily, I was able to trace it down to a thermal fuse that had buildup on it. Thankfully, we now have the repair parts on order.

If your facility has dry ambient conditions right now in these winter months, and you are starting to struggle with sheets clinging together, packaging material clinging to products, or operators complaining of nuisance shocks from aspects of their daily tasks, we have a product that can help. Best of all, we have a promotion to deliver a FREE A/C Sensor pen with any EXAIR Static Eliminator purchase.

Whether you need a fixed solution like the Gen4 Super Ion Air Knife, Intellistat Ion Air Nozzle, or Gen4 Ion Air Cannon, maybe you need something that can travel from one workstation to another or is handheld like our Gen4 Ion Air Gun Kit, or the Intellistat Ion Air Gun. Maybe you don’t have compressed air available like I didn’t in the basement. As long as you have access to a standard 120 VAC 3 prong US plug or 230 VAC, then you can use one of the Gen4 Ionizing Points, a Gen4 Ionizing Bar, or even the Varistat Benchtop Ionizer. See the page at the link below for all the offerings and make sure you use the promotional part numbers to get the free A/C Sensor pen which can be used for electrical troubleshooting for free!

If you aren’t sure which static eliminator will be the best fit for your current application, I and the entire Application Engineer team are here to help. We all have knowledge and experience with the products and a wide variety of backgrounds, so we can help determine the best path forward for you and your team. Contact one of us today.

Brian Farno, MBA – CCASS Application Engineer

BrianFarno@EXAIR.com
@EXAIR_BF

UL Hazardous Locations Class 2 Division 1

Published on by Jordan T ShouseLeave a comment

Per the National Electrical Code (NEC) there are (3) classifications for areas that are defined as hazardous.  They are Class I (gases & vapors), Class II (flammable dust) & Class III (fibers). The focus of today’s Blog is on Class II locations.

Class II locations are those that are hazardous because of the presence of combustible dust. Note that the dust must be present in sufficient quantities for a fire or explosion hazard to exist. The fact that there is some combustible dust present does not mean a Class II hazardous location exists. Dust is defined as a combustible material that must exist as a finely divided solid of 420 microns (0.420 mm) or less. This will allow the dust to pass through a No. 40 sieve.  Just as in Class I, Division 1 and 2, the subdivision of Class II into Divisions 1 and 2 identifies the likelihood that there is an explosion hazard.

Division 1 locations are defined as an area where the amount of combustible dust is either suspended in the air or accumulated on surfaces in a sufficient concentration to allow for ignition.  The ignition could be caused by a failure or malfunction of the equipment in the classified area.  Group E & F dust (see chart below) is considered conductive and could penetrate into electrical equipment such as electric motors, control panels, electrical panels, etc., and cause an electrical failure.

Chart1

Group E dusts are metal dusts, such as aluminum and magnesium. In addition to being highly abrasive, and likely to cause overheating of motor bearings if it gets into them. Group E dusts are also electrically conductive and if they are allowed to enter an enclosure, can cause an electrical failure.

Chart2

Group F dusts are carbonaceous. The primary dust in this group is coal dust. Coal dust has a lower ignition temperature than those in Group E. While Group F dust has a higher thermal insulating value than the layer of Group E.  Therefore Group F requires more control of the temperature on the surfaces that the dust settles on. Group E dusts are semi-conductive, however if the voltages are 600 volts or less it is not generally considered a factor.

Chart3

Group G dusts include plastic dust, most chemical dust and food-grain dust. They are not electrically conductive. Generally, these dusts have the highest thermal insulating characteristics and the lowest ignition temperatures. Therefore, the equipment used in Group G areas must have the lowest surface temperatures to prevent ignition of a layer.

Chart4

Lastly, equipment rated for use in Classified Environments has a rating called the Temperature Code or “T-Code”.  This is the temperature or rather, temperature range that the rated device will operate normally and/or in a failed or failing state.  Consider something as common as a light fixture, electric motors, etc., as they could become hot enough to cause ignition depending on the type of dust in the area.  So be sure to check the “T-Codes” for every piece of equipment that will be used within a Classified Environment.

Chart5

When you are looking for expert advice on Hazardous Location Cabinet Coolers or safe, quiet and efficient point of use compressed air products give us a call.   We would enjoy hearing from you.

Jordan Shouse
Application Engineer

Send me an Email
Find us on the Web 
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Twitter: @EXAIR_JS

More Benefits Than Being Adjustable

Published on by Brian Farno2 Comments

Years ago I was working with a pet food manufacturer who was having issues with their bag opening machine. The problem they had with their existing setup was the dust from manufacturing processes would get sucked into the venturi and start to decrease their performance. Hence, they needed a better solution that wouldn’t need to be replaced and could be cleaned.

Adjustable E-Vac

The bags were empty, and this vacuum generator was positioned to pull the bag open. The bags were made of a non-porous material as they had a coating on them and thus the actual action of opening the bag was not difficult. Enter dust through the throat of a small venturi, and it caused several downtimes that were not scheduled. When looking at the performance characteristics of their existing system I crossed that over to an EXAIR model 840008M – Adjustable E-Vac w/ Straight Through Muffler. This unit was able to open the bag and hold it open for their machine needs. The throat passage of the unit was also larger than their existing generator and the biggest benefit, the Adjustable E-Vac could easily be taken apart and cleaned. To see how easy they are adjusted, which is the same method used to take them apart, check out this previous video blog linked in the image below.

The process changed from changing an existing vacuum generator out, scrapping the old one, and putting in a new one to keeping two on hand. One (EXAIR Adjustable E-vac) that is in operation and functioning, then after a designated amount of time (predictive maintenance), they change it out for the spare (EXAIR Adjustable E-vac) vacuum generator. The second part of the process involves breaking the used one down (without the need for any specialized tools), to clean each of the three pieces on the unit. The refurbished unit is then reassembled, benchmarked for performance, and put on the shelf for the next maintenance cycle.

While this system uses the same volume of compressed air as their previous solution, we still save money in the amount of unusable replacements they were ordering with repairable units, allowing them to keep a working spare on hand. So it saves the customer money on the life of the product. A further benefit is the customer can also get the EXAIR Adjustable E-Vacs quickly as they are standard stock item for us at EXAIR and can ship the same day on orders received by 2 PM ET.

If you want to discuss how an Adjustable E Vac makes sense for you and your team, contact an Application Engineer today!

Brian Farno
Application Engineer
BrianFarno@EXAIR.com
@EXAIR_BF

Hazardous Locations – Class 2 Div 1, Groups E, F & G 

Published on by Jordan T ShouseLeave a comment

Per the National Electrical Code (NEC) there are (3) classifications for areas that are defined as hazardous.  They are Class I (gases & vapors), Class II (flammable dusts) & Class III (fibers), the focus of today’s Blog is on Class II locations.

Class II locations are those that are hazardous because of the presence of combustible dust. Note that the dust must be present in sufficient quantities for a fire or explosion hazard to exist. The fact that there is some combustible dust present does not mean a Class II hazardous location exists. Dust is defined as a combustible material that must exist as a finely divided solid of 420 microns (0.420 mm) or less. This will allow the dust to pass through a No. 40 sieve.  Just as in Class I, Division 1 and 2, the subdivision of Class II into Divisions 1 and 2 identifies the likelihood that there is an explosion hazard.

Division 1 locations are defined as an area where the amount of combustible dust is either suspended in the air or accumulated on surfaces in a sufficient concentration to allow for ignition.  The ignition could be caused by a failure or malfunction of the equipment in the classified area.  Group E & F dust (see chart below) are considered conductive and could penetrate into electrical equipment such as electric motors, control panels, electrical panels, etc., and cause an electrical failure.

Chart1

Group E dusts are metal dusts, such as aluminum and magnesium. In addition to being highly abrasive, and likely to cause overheating of motor bearings if it gets into them. Group E dusts are also electrically conductive and if they are allowed to enter an enclosure can cause an electrical failure.

Chart2

Group F dusts are carbonaceous, the primary dust in this group is coal dust. Coal dust has a lower ignition temperatures than those in Group E.  While Group F dust has a higher thermal insulating value than the layer of Group E.  Therefore Group F requires more control of the temperature on the surfaces that the dust settles on. Group E dusts are semi-conductive, however if the voltages are 600 volts or less it is not generally considered a factor.

Chart3

Group G dusts include plastic dusts, most chemical dusts and food-grain dusts. They are not electrically conductive. Generally these dusts have the highest thermal insulating characteristics and the lowest ignition temperatures. Therefore, the equipment used in Group G areas must have the lowest surface temperatures to prevent ignition of a layer.

Chart4

Lastly, equipment rated for use in Classified Environments have a rating called the Temperature Code or “T-Code”.  This is the temperature or temperature range that the rated device will operate normally and/or in a failed or failing state.  Consider something as common as a light fixture, electric motors, etc., as they could become hot enough to cause ignition depending on the type of dust in the area.  So be sure to check the “T-Codes” for every piece of equipment that will be used within a Classified Environment.

Chart5

When you are looking for expert advice on Hazardous Location Cabinet Coolers or safe, quiet and efficient point of use compressed air products give us a call.   We would enjoy hearing from you.

Jordan Shouse
Application Engineer

Send me an Email
Find us on the Web 
Like us on Facebook
Twitter: @EXAIR_JS