( Log Out /  I guess my question is can a full tank at 135 psi deliver more than the top rating at 90 psi until the tank pressure drops to 90 or below? As you can see, by just adding the EXAIR nozzle to the end of the pipe, the company was able to save $1,872 per year. (Reference below). Generally, the production rate can be expressed in different ways, but I like to use cubic feet per minute per horsepower, or CFM/hp. This would include cheap air guns, drilled holes in pipes, and tubes. Twitter: @EXAIR_jb. When a compressor lists X CFM at 40 psi and x CFM at 90 psi are these specifications what the motor delivers when the tank is filling? Higher horsepower creates greater air pressure, measured in PSI. A gun needing 11cfm is going to chew through those 4 cubic feet in about 20 seconds. How to Calculate Decibel Levels, Estimating the Total Cost of Compressed Air. These applications will - due to browser restrictions - send data between your browser and our server. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. So, we can determine the energy cost to spin the electric motors. Some of our calculators and applications let you save application data to your local computer. While the dynamic type of air compressor is roughly 3.7 – 4.7 CFM/hr. The positive displacement types have different values depending on how efficient the design. That is some real savings. Cubic feet per minute (CFM) and standard cubic feet per minute (SCFM) describe the volume of air a compressor delivers at specific PSI levels. You can target the Engineering ToolBox by using AdWords Managed Placements. What other hard costs are associated with air compressor systems and how do you calculate them? For a single-acting piston type air compressor, the amount of air is between 3.1 to 3.3 CFM/hp. These smaller motors do have some kind of consumption value and should be taken into account…IF the manufacturer has not already included them in their kWh consumption or efficiency values. Dust Collection, Safety and Plant Operation, Job Opportunities and Woodworking Services, How much is not enough? If your air compressor has a unit of horsepower, or hp, you can use Equation 1: hp * 0.746 * hours * rate / (motor efficiency). Divers who engage in very deep or long dives may … So, if you have a 10 hp single-acting piston, you can produce between 31 to 33 CFM of compressed air. In compressed air, this means it is a measure of the flow or output rate that air is coming out of your compressor. With losses through the air hose etc, you probably can only spray until your tank gauge reads about 60psi or so. These are very inefficient for compressed air and can cost you a lot of money. The electrical rate for this facility is at $0.08/KWh. Positive displacement types use the energy from the motor and the shaft to change the volume in an area, like a piston in a reciprocating compressor or like rotors in a rotary compressor. Do the math, a 90 ci tank is just a fraction of the volume of a 75 cu ft tank. You need air flowing out of your gun when you set it at 23psi. One of the worst culprits for inefficient air use is open pipe blow-offs. Sorry, your blog cannot share posts by email. Google use cookies for serving our ads and handling visitor statistics. I'll leave the calculations at 7000 PSI to you. What is … The type of air compressor can help in the amount of compressed air that can be produced by the electric motor. So, if we look at the average of 4 CFM/hp and an average electrical rate of $0.08/KWh, we can use Equation 3 to determine the average cost to make 1000 cubic feet of air. In both equations, you can substitute your information to see what you actually pay to make compressed air each year at your facility. As you can see, the double-acting air compressor can produce more compressed air at the same horsepower. We don't collect information from our users. Higher PSI means the compressor can store more air in the tank, allowing you to operate air tools longer. ( Log Out /  In a high-pressure cylinder, the volume will be affected by the content's compressibility factor Z (PV = ZnRT). As a unit of conversion, there are 0.746 KW in 1 hp. We have 10 air compressors in our plant and I’m in the process of calculating the total annual cost for the system. for pipes ranging size 1/8" to 1/2" - pressure drop 10% of applied pressure per 100 feet of pipe, for pipes ranging size 3/4" to 3" - pressure drop 5% of applied pressure per 100 feet of pipe, en: compressed air pipeline pressure drop flow capacity scfm. The tank will drain very quickly when spraying and will start to fill. Thoughts on proper sizing of compressor airflow capacity and air tank storage capacity. For simple math, you can spray from 130psi down to 60psi, about 1/2 tank or 30 gallons. With the equations above, you can calculate how much you are paying. Your gun is asking for 23psi (dynamic pressure) so the restrictor/gauge on your gun probably needs to be set at around 40 psi without the trigger pulled. There are two types of air compressors, positive displacement and dynamic. CFM stands for cubic feet per minute.

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