With everything that has been going on in the world these last few months, it seems crazy to think we’re knocking on the door of summer. The weather is warming up and it’s time to… More
Since air compressors use a lot of electricity to make compressed air, it is important to use the compressed air as efficiently as possible. EXAIR has six simple steps to optimize your compressed air system. (Click HERE to read). Following these steps will help you to cut your overhead costs and improve your bottom line. In this blog, I will cover a few tips that can really help you to save compressed air.
To start, what is an air compressor and why does it cost so much in electricity? There are two types of air compressors, positive displacement and dynamic. The core components for these air compressors is an electric motor that spins a shaft. Like with many mechanical devices, there are different efficiencies. Typically, an air compressor can put out anywhere from 3 SCFM per horsepower to 5 SCFM per horsepower. (EXAIR settles on 4 SCFM/hp as an average for cost calculations.) Equation 1 shows you how to calculate the cost to run your air compressor.
Cost = hp * 0.746 * hours * rate / (motor efficiency)
Cost – US$
hp – horsepower of motor
0.746 – conversion KW/hp
hours – running time
rate – cost for electricity, US$/KWh
motor efficiency – average for an electric motor is 95%.
As an example, a manufacturing plant operates a 100 HP air compressor in their facility. The cycle time for the air compressor is roughly 60%. To calculate the hours of running time per year, I used 250 days/year at 16 hours/day. So operating hours equal 250 * 16 * 0.60 = 2,400 hours per year. The electrical rate for this facility is $0.08/KWh. With these factors, the annual cost to run the air compressor can be calculated by Equation 1:
Cost = 100hp * 0.746 KW/hp * 2,400hr * $0.08/KWh / 0.95 = $15,077 per year in just electrical costs.
There are two major things that will rob compressed air from your system and cost you much money. The first is leaks in the distribution system, and the second is inefficient blow-off devices. To address leaks, EXAIR offers an Ultrasonic Leak Detector. The Ultrasonic Leak Detector can find hidden leaks to fix. That quiet little hissing sound from the pipe lines is costing your company.
A University did a study to find the percentage of air leaks in a typical manufacturing plant. For a poorly maintained system, they found on average that 30% of the compressor capacity is lost through air leaks. Majority of companies do not have a leak preventative program; so, majority of the companies fall under the “poorly maintained system”. To put a dollar value on it, a leak that you cannot physically hear can cost you as much as $130/year. That is just for one inaudible leak in hundreds of feet of compressed air lines. Or if we take the University study, the manufacturing plant above is wasting $15,077 * 30% = $4,523 per year.
The other area to check is air consumption. A simple place to check is your blow-off stations. Here we can decide how wasteful they can be. With values of 4 SCFM/hp and an electrical rate of $0.08/KWh (refence figures above), the cost to make compressed air is $0.25 per 1000 ft3 of air.
One of the worst culprits for inefficient air usage is open pipe blow-offs. This would also include cheap air guns, drilled holes in pipes, and tubes. These devices are very inefficient for compressed air usage and can cost you a lot of money. As a comparison, a 1/8” NPT pipe versus an EXAIR Mini Super Air Nozzle. (Reference below). As you can see, by just adding the EXAIR nozzle to the end of one pipe, the company was able to save $1,872 per year. That is some real savings.
By following the Six Steps to optimize your compressed air system, you can cut your energy consumption, improve pneumatic efficiencies, and save yourself money. With the added information above, you can focus on the big contributors of waste. If you would like to find more opportunities to save compressed air, you can contact an Application Engineer at EXAIR. We will be happy to help.
One thing that is found in virtually every industrial environment is an air compressor. Some uses for the compressed air generated are: powering pneumatic tools, packaging, automation equipment, conveyors, control systems, and various others. Pneumatic tools are favored because they tend to be smaller and more lightweight than electric tools, offer infinitely variable speed and torque, and can be safer than the hazards associated with electrical devices. In order to power these devices, compressed air must be generated.
There are two main categories of air compressors: positive-displacement and dynamic. In a positive-displacement type, a given quantity of air is trapped in a compression chamber. The volume of which it occupies is mechanically reduced (squished), causing a corresponding rise in pressure. In a dynamic compressor, velocity energy is imparted to continuously flowing air by a means of impellers rotating at a very high speed. The velocity energy is then converted into pressure energy. We’ve discussed the different styles of air compressors here on the EXAIR Blog in the past. Today I’d like to highlight the rotary compressors, one of the positive-displacement types of compressors.
Positive-displacement compressors are broken into two categories: reciprocating and rotary. The rotary compressors are available in lubricant-injected or lubricant-free varieties. Both styles utilize two inter-meshing rotors that have an inlet port at one end and a discharge port at the other. Air flows through the inlet port and is trapped between the lobes and the stator. As the rotation continues, the point inter-meshing begins to move along the length of the rotors. This reduces the space that is occupied by the air, resulting in an increase in pressure.
In the lubricant-injected varieties, the compression chamber is lubricated between the inter-meshing rotors and bearings. This lubricant protects the inter-meshing rotors and associated bearings. It eliminates most of the heat caused by compression and acts as a seal between the meshing rotors and between the rotor and stator. Some advantages of the lubricant-injected rotary compressor include a compact size, relatively low initial cost, vibration free operation, and simple routine maintenance (replacing lubricant and filter changes). Some drawbacks to this style of compressor include lower efficiency when compared with water-cooled reciprocating compressors, lubricant carry over must be removed from the air supply with a coalescing filter, and varying efficiency depending on the control mode used.
In the lubricant-free varieties, the inter-meshing rotors have very tight tolerances and are not allowed to touch. Since there is no fluid to remove the heat of compression, they typically have two stages of compression with an inter-cooler between and an after cooler after the second stage. Lubricant-free compressors are beneficial as they supply clean, oil-free compressed air. They are, however, more expensive and less efficient to operate than the lubricant-injected variety.
Each of these compressors can deliver air to your Intelligent Compressed Air Products. If you’re looking to reduce your compressed air consumption and increase the safety of your processes contact an EXAIR Application Engineer today. We’ll be happy to discuss the options with you and make sure you’re getting the most out of your compressed air usage.
Return on Investment (ROI) is a measure of the gain (preferably) or loss generated relative to the amount of money that was invested. ROI is typically expressed as a percentage and is generally used for financial decisions, examining the profitability of a company, or comparing different investments. It can also be used to evaluate a project or process improvement to decide whether spending money on a project makes sense. The formula is shown below-
- A negative ROI says the project would result in an overall loss of money
- An ROI at zero is neither a loss or gain scenario
- A positive ROI is a beneficial result, and the larger the value the greater the gain
Example – installing a Super Air Nozzles (14 SCFM compressed air consumption) in place of 1/4″ open pipe (33 SCFM of air consumption consumption) . Using the Cost Savings Calculator on the EXAIR website, model 1100 nozzle will save $1,710 in energy costs. The model 1100 nozzle costs $42, assuming a $5 compression fitting and $45 in labor to install, the result is a Cost of Investment of $92.00. The ROI calculation for Year one is-
ROI = 1,759% – a very large and positive value. Payback time is only 13 working days!
If you have questions regarding ROI and need help in determining the gain and cost from invest values for a project that includes an EXAIR Intelligent Compressed Air® Product, feel free to contact EXAIR and myself or one of our Application Engineers can help you determine the best solution.
Recently I took a call from an existing customer that is questioning their Heavy Duty Line Vac Kit setup. They are experiencing around a 38 psig pressure drop from before the filter in the system to the inlet of the Line Vac. At first glance, they assumed this was due to the filter restricting the flow. They then posed the question, “Do I have to run this filter or can I take it out? I mean I already have a filter at my compressor.” The answer is yes, install the filter. It will keep dirt, scale and condensate from entering the Line Vac or other components downstream. In the case of a Line Vac, a filter will also prevent this unwanted debris from getting into the material being conveyed.
However, this is a great question, especially when assuming the filter is causing the pressure drop – but that was not the case for this application. So more questions were asked to our customer to determine what the root cause of the pressure drop could be. Seeing a pressure drop across a filter can be caused by several factors.
One would be an inappropriately sized filter. This can restrict the volumetric flow of air through to the point of use causing a pressure drop. All of the filters supplied with our product kits are auto-drain, have 5 micron filter elements and appropriately sized to operate the product at 80 psig inlet pressure so this was not the problem.
The next issue could be that the filter is clogged, this brought on another question. If you see more than a 5 psig pressure drop across a filter from EXAIR then we suggest changing out the filter element as it could be clogged and not permitting the full volumetric flow through. This installation was fairly new and a quick test without a filter element installed proved it was not the filter element that was clogged.
That brought us to the last variable, the length, size, and number/type of fittings between the filter and the Heavy Duty Line Vac. This length of pipe was more than 30′ in length and was only appropriately sized for a 10′ length or shorter run. The customer was using a 1/2″ Schedule 40 black iron pipe to feed a 2″ Heavy Duty Line Vac at 80 psig inlet pressure. The 2″ Heavy Duty Line Vac Kit will utilize 75 SCFM at 80 psig inlet pressure. That will need a 1/2″ Sched. 40 pipe that is 10′ long or less in order to not have friction loss within the feed pipe. Armed with this information the customer is researching whether or not the line needs to stay that long. If it does, they will have to re-plumb the system with a minimum of a 3/4″ Sched. 40 black iron pipe.
Luckily this was all able to be discussed within a few hours of time and the customer is on their way to an optimal supply system for their in-line conveyor. One brief phone call took this customer from lackluster performance and thinking a product was not going to work for what they need, to performing beyond their expectations, and being able to keep up with their production needs.
If you have a product or any part of your compressed air system that you question why it may be performing or not performing a certain way, please do not hesitate to reach out to our knowledgeable team of Application Engineers. We are always interested in finding a solution to your needs.
A manufacturing company in Ohio altered their production process to start making face masks for the COVID-19 pandemic. It was important for them to change their machines over quickly to start making Personal Protective Equipment, or PPE. As their operation began to produce many masks, they needed a way to extract the face masks from their cutting machine. They contacted EXAIR as we are known for safe, efficient, problem solving products with high quality standards that are in stock and ready to ship to our customers.
At the end of the production line, the face masks went through an inspection/cutting machine. The individual masks would be moved into two carts that were roughly 6 feet (1.8 meters) away. One cart was for good product while the other cart was for noncompliant product. The masks were roughly 6” (15cm) wide by 4” (10cm) high. As the masks went through the inspection machine, they needed a way to move flagged masks to the nonconforming bin and the approved masks to a separate cart for packaging.
EXAIR manufactures Air Operated Conveyors to move product from one place to the another. For short distance and light materials, EXAIR has the Light Duty Line Vac for conveying. This was perfect for the company above. The Light Duty Line Vac are made to use a range from ¾” (19mm) to 6” (152mm) diameter hoses for conveying. They use less compressed air than the more powerful cousins like the Heavy Duty Line Vacs and the standard Line Vacs. They are compact and simple to use. They have a two-piece design and they do not have any moving parts or motors to wear. For the application above, I recommended the model 130600 – 6” Light Duty Line Vac. They were large enough to move the face masks at the speeds that they were producing.
One benefit in calling EXAIR was that we had these in stock and ready to go. They purchased two units for their operation. They shared some other details about their operation. Since the Light Duty Line Vacs only use compressed air to work and can move product quickly, they connected a solenoid valve to each Light Duty Line Vac. When the mask was inspected, the machine would trigger the appropriate solenoid valve to move the face masks to either the “good” bin or to the “bad” bin.
EXAIR manufactures a large variety of Air Operated Conveyors to move light materials like face masks up to heavier materials like steel shot. And, if you need a quick unit to change or update your system, EXAIR stocks many of these in different sizes and types. For the customer above, we shipped that same day in order for them to finish their change to start making PPE. And for U.S. and Canadian customers, EXAIR offers a 30-day unconditional guarantee to try these units. If you need to move product from point A to point B, you can contact an Application Engineer at EXAIR to discuss. We will be happy to help you; even during this pandemic.
It’s a longstanding joke for anyone that lives in the Cincinnati area that we can experience all (4) seasons in less than a week. This past weekend, we topped out at a high temperature of 83°F. This morning when I left the house it was a cool, crisp 37°F. With temperatures later on this week dropping below freezing, we’ve gone from the heat of summer to the cold of winter all in less than a week. These uncertain temperature fluctuations create all sorts of problems for farmers and home gardeners (like myself) as we struggle with determining the best time to plant (and rushing to cover up anything that’s already been planted!). Additionally, extreme temperature fluctuations can also cause significant issues for the electrical panels in your facility.
During times of high heat, the temperatures inside of these enclosures can reach dangerous levels. The use of fans, or worse opening the panel door, does help to keep the temperature down. But this can create even more issues. When using a fan or opening the panel door, you expose the sensitive internal electronics to any dirt, dust, debris, and even moisture from the ambient environment. Fortunately, maintaining a safe temperature and clean environment inside of your enclosure is simple.
EXAIR’s Cabinet Cooler Systems were designed specifically to rectify these issues within your facility. Utilizing Vortex Tube technology, the Cabinet Cooler produces cold air from an ordinary supply of compressed air. This cold air keeps the enclosure free of debris and moisture and is easily installed in minutes through a standard electrical knockout. The Cabinet Cooler Systems are available in Aluminum, 303 Stainless Steel, and 316 Stainless Steel construction with Nema 4 (IP66) ratings. We also have Nema 12 (IP54) rated Cabinet Coolers that are available constructed of Stainless Steel. For systems that are not able to be mounted on top of the cabinet, we also have Side Mount Kits available in Aluminum, 303 Stainless, and 316 Stainless.
These systems are available with cooling capacities of anywhere from 275-5,600 Btu/hr. To make things much easier for you, we offer a Cabinet Cooler Sizing Guide that will allow us to recommend the most suitable model for your cabinet. With a few quick measurements, we’ll be able to determine the exact heat load that we’ll need to dissipate and offer you a quick and easy solution. If you’re experiencing heat related issues somewhere within your facility or remember the troubles that they caused you last year, contact an Application Engineer today and we’ll see to it that this summer your cabinets remain cool!