![]() ![]() The ability to overpressure a single stage compressor is in no way related to the performance of a 2 stage unit. Notice on the Husky unit linked, the statement "2 stage performance". They sold it based on "Oh wow, 200 psi." And that's all that matters to them. So long as it'll outlast the warranty, they could give a big damn if it melts down a day after the warranty ends. Enter the 200psi single stage consumer air compressor. So, once their ability to claim 6hp from a 1.5hp motor was taken away, they had to find something else to market that wasn't technically lying. The government stepped on a whole raft of these clowns for lying about horsepower on all sorts of consumer goods from lawn mowers to air compressors. Both are based on science, and no marketing goon can escape the fact. ![]() Thermodynamic principles determine heat of compression and heat transfer laws determine the ability of any device to shed the heat as it's generated. Single stage compressors, even very expensive and high quality ones, have historically operated at a max pressure of 125 to 135 psi. The difference is Quincy is rating theirs within the normal operating pressure range for single stage compressors while the other two are pouring on marketing crap by the bucket full.Ī single stage compressor cycling at 175 or 200 psi is going to have a short life primarily due to excess heat. It will depend on what kind of tools you're using and how you're using them.Īll of these are single stage compressors, including the Quincy. If you need specific guidance on that, let me know. In any case, once you have a working number for the rate of consumption, you can calculate how long it will take to lower your tank pressure to the compressor cut in pressure and them to the regulated pressure etc. Also, if that number is for the tool "free running", it will consume even more air under load. In other words, if a die grinder advertises 6 CFM consumption but is based on a 25% use factor, that actually translates to 24 CFM. The problem is, this number is usually based on an "average" use case scenario which assumes something like a 25% to 35% use factor. This may not be a problem for intermittent use, but may affect the lifespan of the motor/pump/parts.Īs for calculating "run time", most air tools have an advertised CFM rating. Achieving those high pressures with a low hp pump puts a lot of wear and tear on the machine. Others have mentioned that a two stage compressor in this size/class is probably not necessary/ideal and I tend to agree. They have a duty cycle rating (50 - 60%?) and for a compressor with a small tank, a high cut in pressure, and a low flow pump, the compressor may often exceed that duty cycle under constant use. Speaking of "constantly", compressors in this class are usually not rated for constant use. That's why you will see the CFM number is usually the one people focus on, because that's what the compressor is capable of delivering constantly once the tank is drained initially. Now once the compressor kicks on, it's a race between your compressor's pump and your tool to see who can make/use more air and with a compressor of this size, your tool is going to win. You can use Boyle's to calculate this for yourself.Īt the air consumption rate for something like a die grinder, you're going to chew through that 9 cubic foot difference in a matter of 15 or 20 seconds under constant use. With a small tank (let's assume 25 gallons), the actual difference in the volume of stored air at 135 psi vs 175 psi is only about 9 cubic feet. It will depend on what kind of tools you're using and how you're using them. ![]()
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