Use of compressed air, or “the fourth utility” as it’s called, is widespread in many industries. How you use it in your business is important, for a couple of key considerations:
Compressed air isn’t free. Heck, it isn’t even cheap. According to a Tip Sheet on the U.S. Department of Energy’s website, some companies estimate the cost of generation at $0.18 – $0.30 per 1,000 cubic feet of air. A typical industrial air compressor will make 4-5 Standard Cubic Feet per Minute per horsepower. Let’s be generous and assume that our 100HP compressor puts out 500 SCFM and is fully loaded 85% of the time over two shifts per day, five days a week:
500 SCFM X $0.18/1,000 SCF X 60 min/hr X 16 hr/day X 5 days/week X 52 weeks/year =
$22,464.00 estimated annual compressed air cost
If you want to go jot down some numbers from your compressor’s nameplate and your last electric bill, you can accurately calculate your actual cost. Here’s the formula:
Taking our same 100HP compressor (105 bhp required,) fully loaded 85% of the time, and assuming the motor’s good (95% efficient):
(105 bhp X 0.746 X 4,160 hours X $0.08/kWh X 0.85 X 1.0)÷ 0.95 =
$23,324.20 actual annual compressed air cost
So, our estimate was within 4% of our actual…but the point is, $22,000 to $23,000 is a significant amount of money, which deserves to be spent as wisely as possible, and that means using your compressed air efficiently. Engineered solutions like EXAIR Intelligent Compressed Air Products can be a major part of this – look through our Case Studies; implementing our products have saved companies as much as 60% on their compressed air costs.
Health & Safety
Injuries and illnesses can be big expenses for business as well. Inefficient use of compressed air can be downright unsafe. Open ended blow offs present serious hazards, if dead-ended…the pressurized (energized) flow can break the skin and cause a deadly air embolism. Even some air nozzles that can’t be dead ended (see examples of cross-drilled nozzles on right) cause a different safety hazard, hearing loss due to noise exposure. This is another case where EXAIR can help. Not only are our Intelligent Compressed Air Products fully OSHA compliant in regard to dead end pressure, their efficient design also makes them much quieter than other devices.
Efficient use of compressed air can make a big difference in the workplace – not only to your financial bottom line, but to everyone’s safety, health, and livelihood. If you’d like to find out more about how EXAIR can help, give me a call.
Visit us on the Web
Follow me on Twitter
Like us on Facebook
Over the years, EXAIR has come across a variety of different types of blow-off devices. We have seen copper tubes, pipes with a crushed end, fittings with holes drilled into them, and modular flex lines. For compressed air use, these are very dangerous and very inefficient. In many instances, companies will go through a mixed bag of items to make a blow-off device for their application. It is inexpensive to do. But what they do not realized is that these items are very unsafe and will waste your compressed air, costing you much money in the long run.
When EXAIR started to manufacture compressed air products in 1983, we created a culture in making high quality products that are safe, effective, and efficient. Since we stand by our products, we created a program called the Efficiency Lab. We test blow-off devices against EXAIR products in noise levels, flow usage, and force measurements. With calibrated test equipment, we compare the data in a detailed report for the customer to review. If we are less effective, we will state that in the report, but this is very rare. With this quantified information, we can then determine the total amount of air savings and safety improvements that EXAIR products can offer.
With our Efficiency Lab, it is quite simple to do. For starters, you can go to our Product Efficiency Survey on our website to give the conditions for testing. If you wish for a side by side analysis, you can place your pneumatic device in a box and send it to EXAIR. We will run the tests at the specified conditions or in a range of settings. We will then return your pneumatic device back to you with a report of the comparison. This report can be used to show managers, executives, HSE, etc. on the improvements that EXAIR can provide in cost savings and safety.
In a recent Efficiency Lab, a customer sent us a water jet nozzle that he was using to blow off product passing on a conveyor (reference photo above). The customer supplied us with the required information to test. They had three water jet nozzles on a manifold that had ¼” NPT male connections. The air pressure was set at 75 PSIG (5.2 bar), and the air pattern was round. Their annual usage for this blow-off device was 7000 hours continuous, and their electric rate for their facility was $0.10/KWh. The reason that they sent their nozzle to EXAIR was because the operation was very loud, and they believed that they were wasting compressed air. They asked me for a recommendation and what the payback period might be with my selection.
I recommended the model 1101 Super Air Nozzle as our standard round pattern with a ¼” NPT male connection. With our engineered design, the Super Air Nozzle can entrain the “free” ambient air into the air stream to generate a hard-hitting force; using less compressed air. Also, with this suggestion, they will not have to redesign their blow-off station; just remove the water jet nozzles and replace them with the Super Air Nozzles. We tested the water jet nozzle, and we found that it used 17.5 SCFM (496 SLPM) at 75 PSIG (5.2 bar). The noise level was measured at 91.2 dBA for a single nozzle. As a comparison, the model 1101 Super Air Nozzle will only use 13.3 SCFM (376 SLPM) of compressed air at 75 PSIG (5.2 bar); and, the noise level was reduced to 73 dBA for each nozzle.
The first thing that is important to me is safety. High noise levels will cause hearing damage. OSHA generated a standard 29CFR-1910.95a with a chart for Maximum Allowable Noise Exposure. To calculate the noise level for three nozzles, I will reference a previous blog that I wrote: “Measuring and Adding Sounds”. With three water jet nozzles, the total sound is 96 dBA. From the OSHA table above, the usage without hearing protection is less than 4 hours a day. With the Super Air Nozzles, the noise level will be 78 dBA for all three nozzles; well below the requirement for 8 hours of exposure. It is difficult to put a monetary value on safety, but using PPE should never be the first step as a solution.
For the annual savings and the payback period, I will only look at the electrical cost. (Since the Super Air Nozzle is using less compressed air, the maintenance and wear on your air compressor is reduced as well).
The air savings is calculated from the comparison; 17.5 SCFM – 13.3 SCFM = 4.2 SCFM per nozzle. With three nozzles, the total compressed air savings will be 12.6 SCFM for the blow-off station. An air compressor can produce 5.36 SCFM/KW of electricity at a cost of $0.10/KWh. For an annual savings, we have the figures from the information above; 7000 hours/year * 12.6 SCFM * $0.10/KWh * 1KW/5.36 SCFM = $1,645.52/year. For the payback period, the model 1101 Super Air Nozzle has a catalog price of $44.00 each, or $132.00 for three. The customer above did not disclose the cost of the water jet nozzles, but even at a zero value, the payback period will be just under 1 month. Wow!
Not all blow off devices are the same. With the customer above, they were able to reduce their noise levels and compressed air consumption. If your company decides to select an unconventional way to blow off parts without contacting EXAIR, there can be many hidden pitfalls; especially with safety. Besides, if you can save your company thousands of dollars per year as well, why go with a non-standard nozzle? If you have a blow off application and would like to compare it against an EXAIR product, you can discuss the details with an Application Engineer. What do you have to lose?
The gun has a number of benefits starting with the metal 3/8″ NPT inlet which permits air flows high enough to operate our model 1106 – 1/2″ Super Air Nozzle. With the 1106 Super Air Nozzle on the gun it will provide 3.3 lbs of force to provide ample cleaning, clearing, or cooling air for the tough industrial jobs.
Secondly, the gun offers an over molded grip that is ergonomic and rugged to handle the industrial environments that maintains its grip even when doused in coolants.
Third, the gun offers a cast 4 finger blade style trigger that permits ergonomic easy trigger pull that can be easily used throughout a work shift. In the event the trigger becomes damaged it can also be easily replaced with stock parts direct from EXAIR.
Fourth, we easily offer any of the Heavy Duty Safety Air Gun combinations with extensions up to 72″ in length and with or without the Chip Shield option.
Lastly, as mentioned in first point, the gun and extensions can be combined with any of the EXAIR Super Air Nozzles up to 1/2″ NPT inlet. Whether you need a small precision puff of air from the Atto Super Air Nozzle, the forcefull blast of the 1106 1/2″ Large Super Air Nozzle, or anywhere in between, there is an engineered nozzle for it and we can couple them with the Heavy Duty Safety Air Gun.
To find out what kind of Safety Air Gun can fill the needs of your application, feel free to contact us. If you are using an existing non-engineered gun and would like to explore the safe, quiet world of engineered air nozzles coupled with safety air guns, then feel free to reach out to us and inquire about our FREE Efficiency Lab Service.
As margins get tighter and cost of manufacturing climbs, industries are looking into different areas to be more efficient. A big focus nowadays is in their compressed air system. Why is this? Manufacturers are starting to realize that it takes an abundant amount of electricity to make compressed air. That is why EXAIR manufactures compressed air products for optimization to get the best efficiency. But what many manufacturers don’t realize is that quiet little hissing sound from there compressed air lines is costing them much money. That is why EXAIR has the Ultrasonic Leak Detector.
Energy Star, a federal voluntary program ran by the Environmental Protection Agency, offers energy-efficient solutions. EXAIR has partnered with Energy Star because it underscores our commitment to improve energy savings. They even wrote an excerpt about compressed air leaks here: Energy Tips: Minimize Compressed Air Leaks. With compressed air leaks, it can be as much as 30% of your compressed air usage.
When a leak occurs, it emits an ultrasonic noise. The EXAIR Ultrasonic Leak Detector can pick this up. It has a frequency range from 20 KHz to 100 KHz, above human hearing, so it can make the inaudible leaks, audible. With three sensitivity ranges and LED display, you can find very minute leaks. It comes with headphones and two attachments; the parabola attachment to find leaks up to 20 feet (6 meters) away, and the tube attachment for local proximity to define the exact location of the leak.
In the Energy Tips from Energy Star, they reference estimated leak rates and costs associated with these leaks. They also recommend a leak prevention program with reference materials to help improve energy savings. As part of that program, an Ultrasonic Leak Detector is the best way to begin.
To tell a common success story about the Ultrasonic Leak Detector, an EXAIR customer had a 50-horsepower air compressor. It started to overwork, overheat, and occasionally shut down. He thought that he would need to buy a larger air compressor to keep his plant running. In discussing his problems and requirements, he decided to purchase an Ultrasonic Leak Detector from EXAIR to check for leaks as a possible cause. He checked every fitting and connection in his facility. When he finished checking the compressed air system, he found 91 leaks. (You will be surprised with your system if it is not well maintained).
If we look at a very small 1/16” (1.6mm) diameter hole at 80 PSIG (5.5 bar), it will cost you $360 a year per leak (based on 6000 working hours per year). Thus, 91 leaks at $360/year will equal $32,760 per year. After the fittings were reworked with piping compound, the compressor was back operating in a normal range. There was no need to buy a larger air compressor with capital funds, and he was able to save $32,760 a year by finding and fixing the leaks.
As a little secret with the Ultrasonic Leak Detector, it can do more than find compressed air leaks. Any issue that creates an ultrasonic noise, the Ultrasonic Leak Detector can find it. This will include air damper seals, circuit breakers, cracked rubber belts, gas burner leaks, refrigerant leaks, worn bearings, and air brake systems on trucks. It is a handy tool to find potential issues or problems in other areas other than compressed air systems.
For optimization of your compressed air system, it is very important to find and correct leaks in your piping system. The Ultrasonic Leak Detector can help you do that. It is an inexpensive way to solve an expensive problem, compressed air leaks. If you would like to discuss the features and benefits in more detail, you can contact an Application Engineer at EXAIR. We will be glad to help you.
As mentioned in my post last week. The supply side of compressed air systems within a facility is critical to production. The quality of air produced by your compressor and sent to the demand side of the system needs to be filtered for both moisture and particulate. One method to dry the air, that is the topic for this blog, is deliquescent type dryers.
These dryers operate like an adsorbent dryer such as a desiccant medium dryer. The main variance is that the drying medium (desiccant) actually undergoes a phase change from solids to liquids. Because of this the material is used up and cannot be returned to its original state for reuse. The liquids formed by the desiccant dissolving in the removed water vapor are then filtered out of the air stream before it is passed on to the demand side of the air system.
There are many compounds that are used to absorb the moisture in the wet compressed air. A few options are potassium, calcium, or sodium salts and many that contain a urea base. The desiccant compound must be maintained at a minimum level for the dryer to contain enough media to successfully dry the air.
These dryers are generally a single tank system that is fed with compressed air from a side port near the bottom of the tank. The air then travels up past drip trays where the desiccant and water mixture fall and ultimately ends up in the bottom of the tank. The air then goes through a material bed that must be kept at a given level in order to correctly absorb the moisture in the air. The dry air is then pushed out the top of the tank.
As the desiccant material absorbs the liquid from the compressed air flowing through the tank it falls onto the drip trays and then into the bottom of the tank where it is drained out of the system. This process can be seen in the image below.
The dew point that this style dryer is able to achieve is dependent on several variables:
Compressed air temperature
Compressed air pressure / velocity
Size and configuration of the tank
Compression of the absorption media
Type of absorption media and age of media
These dryers are simplistic in their design because there are no moving parts as well as easy to install and carry a low startup cost.
Some disadvantages include:
Dewpoint range 20°F – 30°F (Again this is according to the media used.)
Dissolved absorption material can pose a disposal issue as it may not be able to be simply put down a drain
Replacement of the absorption material
Even with disadvantages the ability to supply the demand side of a compressed air system for a production facility is key to maintaining successful operations. If you would like to discuss any type of compressed air dryer, please contact us.
The supply side of a compressed air system has many critical parts that factor in to how well the system operates and how easily it can be maintained. Dryers for the compressed air play a key role within the supply side are available in many form factors and fitments. Today we will discuss heat of compression-type dryers.
Heat of compression-type dryers are a regenerative desiccant dryer that take the heat from the act of compression to regenerate the desiccant. By using this cycle they are grouped as a heat reactivated dryer rather than membrane technology, deliquescent type, or refrigerant type dryers. They are also manufactured into two separate types.
The single vessel-type heat of compression-type dryer offers a no cycling action in order to provide continuous drying of throughput air. The drying process is performed within a single pressure vessel with a rotating desiccant drum. The vessel is divided into two air streams, one is a portion of air taken straight off the hot air exhaust from the air compressor which is used to provide the heat to dry the desiccant. The second air stream is the remainder of the air compressor output after it has been processed through the after-cooler. This same air stream passes through the drying section within the rotating desiccant drum where the air is then dried. The hot air stream that was used for regeneration passes through a cooler just before it gets reintroduced to the main air stream all before entering the desiccant bed. The air exits from the desiccant bed and is passed on to the next point in the supply side before distribution to the demand side of the system.
The twin tower heat of compression-type dryer operates on the same theory and has a slightly different process. This system divides the air process into two separate towers. There is a saturated tower (vessel) that holds all of the desiccant. This desiccant is regenerated by all of the hot air leaving the compressor discharge. The total flow of compressed air then flows through an after-cooler before entering the second tower (vessel) which dries the air and then passes the air flow to the next stage within the supply side to then be distributed to the demand side of the system.
The heat of compression-type dryers do require a large amount of heat and escalated temperatures in order to successfully perform the regeneration of the desiccant. Due to this they are mainly observed being used on systems which are based on a lubricant-free rotary screw compressor or a centrifugal compressor.
No matter the type of dryer your system has in place, EXAIR still recommends to place a redundant point of use filter on the demand side of the system. This helps to reduce contamination from piping, collection during dryer down time, and acts as a fail safe to protect your process. If you would like to discuss supply side or demand side factors of your compressed air system please contact us.
If you’re a regular reader of the EXAIR blog, you’re likely familiar with our:
This guideline is as comprehensive as you want it to be. It’s been applied, in small & large facilities, as the framework for a formal set of procedures, followed in order, with the goal of large scale reductions in the costs associated with the operation of compressed air systems…and it works like a charm. Others have “stepped” in and out, knowing already where some of their larger problems were – if you can actually hear or see evidence of leaks, your first step doesn’t necessarily have to be the installation of a Digital Flowmeter.
Here are some ways you may be able to “step” in and out to realize opportunities for savings on your use of compressed air:
Power: I’m not saying you need to run out & buy a new compressor, but if yours is
aging, requires more frequent maintenance, doesn’t have any particular energy efficiency ratings, etc…you might need to run out & buy a new compressor. Or at least consult with a reputable air compressor dealer about power consumption. You might not need to replace the whole compressor system if it can be retrofitted with more efficient controls.
Pressure: Not every use of your compressed air requires full header pressure. In fact, sometimes it’s downright detrimental for the pressure to be too high. Depending on the layout of your compressed air supply lines, your header pressure may be set a little higher than the load with the highest required pressure, and that’s OK. If it’s significantly higher, intermediate storage (like EXAIR’s Model 9500-60 Receiver Tank, shown on the right) may be worth looking into. Keep in mind, every 2psi increase in your header pressure means a 1% increase (approximately) in electric cost for your compressor operation. Higher than needed pressures also increase wear and tear on pneumatic tools, and increase the chances of leaks developing.
Consumption: Much like newer technologies in compressor design contribute to higher efficiency & lower electric power consumption, engineered compressed air products will use much less air than other methods. A 1/4″ copper tube is more than capable of blowing chips & debris away from a machine tool chuck, but it’s going to use as much as 33 SCFM. A Model 1100 Super Air Nozzle (shown on the right) can do the same job and use only 14 SCFM. This one was installed directly on to the end of the copper tube, quickly and easily, with a compression fitting.
Leaks: These are part of your consumption, whether you like it or not. And you shouldn’t like it, because they’re not doing anything for you, AND they’re costing you money. Fix all the leaks you can…and you can fix them all. Our Model 9061 Ultrasonic Leak Detector (right) can be critical to your efforts in finding these leaks, wherever they may be.
Pressure, part 2: Not every use of your compressed air requires full header pressure (seems I’ve heard that before?) Controlling the pressure required for individual applications, at the point of use, keeps your header pressure where it needs to be. All EXAIR Intelligent Compressed Air Product Kits come with a Pressure Regulator (like the one shown on the right) for this exact purpose.