The ability to control the flow of materials has been a staple in human civilization since 4000 BCE. This includes the creation of pipes which have appeared as early as 2400 BCE from the Egyptians. These piping systems have since then been improved on to be made stronger, lighter, cheaper, of various styles, and in a variety of materials. One of these styles is the sanitary flange pipe.
Sanitary flange pipe and fittings is one of the larger milestones in piping innovation. Sanitary flange pipes came about due the stringent cleanliness controls in certain industries such as food and pharmaceutical. Both of these use a highly corrosive and caustic soap to sanitize surfaces and, in most cases, entire rooms. Sanitary flange pipes allow for pipe systems to be taken apart easily so that components can be easily cleaned out on a regular sterilization process, and are generally made of 316 Stainless Steel to withstand the corrosive nature of the cleaning compound.
EXAIR Line Vac Air Operated Conveyors have always been well suited for these applications since the internal components are smooth and can be cleaned out easily and sanitized. They have also been made out of 316 Stainless Steel for years which provides superior corrosion resistance and can withstand most caustic cleaners and oxidants. Type-316 Stainless Steel is the preferred material for many food and pharmaceutical applications. Before EXAIR’s Sanitary Flange Line Vac, we noticed our customers would use the standard smooth Line Vac and weld a sanitary flange onto the ends, or installing adaptors on our Threaded Line Vac.
With that thought we decided to make things easier and developed the Sanitary Line Vac which follows the basic design of the Standard Line Vac and operates with the same performance characteristics. Sanitary Flange Line Vacs come in four sizes: 1-1/2”, 2”, 2-1/2”, and 3”. These sizes are the most common sizes for Line Vacs and covers the majority of application needs.
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.
Cody Biehle Application Engineer EXAIR Corporation Visit us on the Web Follow me on Twitter Like us on Facebook
Conveyor systems come in many shapes, sizes, and configurations. They can be run at different speeds, and are made of various materials, depending what they’re carrying, and why they’re carrying it. And sometimes, they’re hilarious:
If you’re looking to move solids, in bulk, through pipe, there’s not a simpler way to do it than with an EXAIR Threaded Line Vac. Like our ‘standard’ Line Vacs, they use compressed air to generate a powerful vacuum flow to get air behind the pieces and carry them along:
But, while the ‘standard’ Line Vacs are made for use with Conveyance Hose, the Threaded Line Vacs have male NPT threads so you can pipe them in line. We have a range of options, depending on the nature of your applications:
Sizes: 3/8 NPT to 3 NPT.
Materials: aluminum, 303SS, 316SS, and hardened alloy.
Environment: the materials of construction listed above may be important because of the nature of the product being conveyed, but they also have different temperature ratings. Our Stainless Steel Line Vacs also come in a High Temperature design, in case the material – or the environment – is particularly hot:
Aluminum: 275°F (135°C)
Heavy Duty Hardened Alloy: 400°F (204°C)
303 or 316SS: 400°F (204°C)
High Temp 303 or 316SS: 900°F (482°C)
If you’ve got a conveyor application you’d like to discuss, give me a call.
Russ Bowman Application Engineer EXAIR Corporation Visit us on the Web Follow me on Twitter Like us on Facebook
As an Application Engineer, I get the pleasure to speak to many companies about trying to find a simple, long-lasting, powerful but quiet type of transfer systems. They have operators that climb steps to dump bags of material in hoppers above. Or they need a compact way to remove scrap from your process. Or they have budgetary constraints to convey material from point A to point B. If your company had to tackle any of these issues, EXAIR can help you. We manufacture Air Operated Conveyors that do not have any moving parts, very compact in design, and have a high throughput capacity. They can attach easily to standard hoses, pipes, or sanitary flanges. These inexpensive conveyors are designed to make conveyance safer and ergonomically better for your operators. EXAIR calls this product line, Line Vacs™.
The Line Vacs use a small amount of compressed air to generate a vacuum by a Venturi effect. The unique design generates a high velocity to create a powerful vacuum on one side. Once the product reaches the throat area of the Line Vac, the compressed air will carry the product the rest of the way. We can reach horizontal distances up to 100 feet (30 meters) and vertical heights up to 20 feet (6 meters). EXAIR manufactures a variety of Line Vacs in different sizes, styles, and materials. In this blog, I will cover our most powerful and abrasion resistant type, the Heavy Duty Line Vacs.
The Heavy Duty Line Vacs are engineered to move abrasive materials with increased conveyance rate. They range from ¾” O.D. standpipes as our smallest up to 3” O.D. standpipes for hose connections. The construction is made from a hardened alloy to resist wear from abrasive bulk products like steel parts, sand, glass, ceramic, etc. The Heavy Duty Line Vac can create a high vacuum level to pick up heavier objects as well as conveying larger volume of material. If purchased as a kit, the Line Vac will come with a filter, regulator, and a mounting bracket. This adds overall value in mounting, controlling, and protecting the Line Vac for years to come. This simple device has no moving parts and is a great product to use in rugged industrial applications. You will not have to worry about any motors or bearing prematurely wearing out.
If you need to convey heavy materials like steel shot or abrasive products, the Heavy Duty Line Vac could be a blessing for you. Not only can they transfer material safely and quickly, but they also will ergonomically help in saving the backs and knees of your operators. For our U.S. and Canadian customers, we are running a promotional ad. You will receive a 2” Flat Super Air Nozzle, a $72.00 value, for free from now until the end of October 2020 with a qualified purchase online. If you would like to discuss your conveying application further, please contact an Application Engineer at EXAIR. We may have a solution for you.
Desiccant dryers come in different forms. They are designed for water sensitive areas as they can reach a dew point to -40oF (-40oC) and below. That means that water will not condense in the compressed air lines until the temperature is below the dew point. The desiccant inside these units will adsorb the water vapor as compressed air passes through a bed. Once the desiccant bed is full of water vapor, it will have to be regenerated.
A typical system will use two towers that will switch back and forth. One tower is used to remove the water from the compressed air system, and the other is used to regenerate the desiccant. In this blog, I will cover how the desiccant can be regenerated with a Heat of Compression (HOC) type of desiccant dryer.
An air compressor is not an efficient device. For every eight horsepower of energy to make compressed air, only one horsepower is used as work. And for compressed air drying, the type of desiccant dryer is important. Regeneration of desiccant beads can be done either with non-heated or heated means. The non-heated, or heatless version will use 15% of your compressed air to purge through the regeneration tank. The air escapes into the atmosphere with the water vapor and is wasted.
With the heated type desiccant dryers, they come in three different categories. One type uses a heater to increase the temperature of the compressed air. At the elevated temperature, the purge requirement can be reduced to 7% for the regeneration of desiccant. But, still compressed air is wasted. To cut the purge to zero, a blower-type heated desiccant dryer can be used. Instead of heating the compressed air, the blower will push ambient air through a heater to regenerate the desiccant bed. But can you get more efficient than that?
Well, what if you can remove the heater and the blower? The heat of compression type of desiccant dryers can do that. Remember above when I mentioned that “for every eight horsepower of energy to make compressed air, only one horsepower is used as work”. The seven horsepower of energy that is lost is given off as heat. The HOC dryer uses that heat to regenerate the desiccant bed. So, the overall energy is reduced even further. There is a restriction when using this type of dryer. The air compressor will have to be oil-free because oil will coat the desiccant beads and stop the adsorption rate.
When the air is compressed, heat is generated. This heated air can reach around 200oF (93oC). With the higher temperature, air can hold more water vapor. As the heated air passes through the desiccant bed that needs to be regenerated, the water vapor is picked up from the desiccant beads. The saturated air would then pass through an aftercooler. The aftercooler reduces the air temperature below 100oF (38oC) which will cause the water to drop out. From the aftercooler, the air will then pass through the desiccant bed in the drying tower. When the cycle time is reached, the towers will switch to regenerate the second tower.
With these types of dryers, the desiccant beads will start to degrade from regeneration. To help replace them, EXAIR offers a Line Vac. Instead of climbing a ladder with many bags of desiccant, the Line Vac can do this safely and ergonomically. EXAIR Line Vacs use a small amount of compressed air to generate a powerful vacuum by a Venturi effect. The unique design of the generators creates a high velocity of air to create a low pressure on one side and a powerful thrust on the other. The Line Vac can pick up and move solid material vertically up to 20 feet (6 meters). You can watch a video on the operation of a Line Vac HERE. The EXAIR Line Vacs are very quiet, compact, rugged, and powerful. To replace the desiccant, it can do it quickly and safely.
If you need to convey solid materials in a quick and easy way, an EXAIR Line Vac could be a solution for you. We have them in a variety of materials and designs to match your application. Ergonomically, they can save the back-wrenching labor of picking up bags, climbing stairs, and dumping material into towers. If you want to know if the EXAIR Line Vac could work for you, an Application Engineer at EXAIR can help to recommend the best unit for you.