Rotary Screw VS Reciprocating Air Compressors | CompressedAirUSA.com
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- เผยแพร่เมื่อ 11 ส.ค. 2019
- What is the difference between Rotary Screw & Reciprocating Air Compressors?
Reciprocating compressors are often used for intermittent tasks that require compressed air. The reciprocating action of pistons is what compresses air, and this process produces a lot of heat from friction. The result is that the compressor is louder, requires down time to cool, and cannot handle running constantly.
Rotary Screw compressors are often used for continuous demands of compressed air. The screws are positioned so that incoming air is forced through the channels on the screws, and as the volume in the channel decreases the pressure of the air increases. This results in a quiet and continuous source of compressed air.
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I absolutely love that you guys have a bronze A200 Leslie airhorn on the shelf in the workshop, that's great.
I think there is More to consider when comparing - what about a constant speed piston compressor in a high demand application where the pump loads and once pressure is built up then it unloads which keeps the motor spinning and the pump freewheels allowing the pumps flywheel / cooling fan to quickly cool the pump it increases the normal 75% duty cycle closer to 100 - it is similar to a screw machine when it unloads . Screws are much quieter yes BUT they have far more mauntenance issues due to all the many parts , electronic control items that can go bad; to the contrary a good Quality ( made in America) cast iron slow speed piston air compressor is made for the long haul with only a pump, motor, belts, pressure switch, magnetic starter and a tank ( optional air cooled after cooler ) , that's it ! They are very cheap to maintain compared to a screw - and a regular guy can do the routune. maintenance of oil / air filter changes, belt changes and even a pump rebuild which most maintenance guys are car guys and rebuilding a pump is way easier and quicker than rebuilding a car engine.. A piston uses less expensive common hydraulic oil or even ATF ( 5 gal for $40 ) , screw oil is $65 - $150 per gallon !! plus wait till you need parts on a screw, That's when you will find out why it is really called a screw machine.
Just my thoughts on it.
What size rotary screw comprssor you recommend for a body shop (painting complete cars)and grinding,sanding for 3-4 people working at the same time .I have 80 gal tank that I could use as a buffer too.
Great question. The beauty of a rotary screw is that it is designed for a 100% duty cycle, meaning it will run all day to keep up with your continuous use of air. Painting, grinding, and sanding are large air loads, and with 3-4 people working at the same time, that is a big demand. We would recommend something that can handle around 30 CFM for those tasks so you would be looking at a 10 HP rotary screw.
Check out our CFM calculator, punch in the tools or number of techs you have, and it will show your air demand compressedairusa.com/cfm-calculator/
Which type of compressor will be better if used in refrigerator specifically ice block factory
I’m looking for a new compressor. We powder coat, some paint and blast to prep parts.
We have a 5hp piston compressor keeps up fairly well but would like a bit more capability.
Which would you recommend rotary screw or piston? Which provides cleaner air and is one more energy efficient than the other?
Thanks in advance.
Thanks for the great question. For your applications of powder coating, painting, and sand blasting - those processes have a large air demand. Running a sprayer or blaster off of a piston compressor comes with disadvantages. The duty cycle of the piston compressor is 50%, meaning it needs half the run time to be idle and cooling, so you are limited to what is charged in the receiver while it is off. The rotary screw is designed with 100% duty cycle, meaning it will run the entire time and put out much more air. The rotary screw is also quieter, if you work in the vicinity of the compressor that is an enjoyable benefit. As for which produces cleaner air - the rotary screws are oil soaked and there is typically more oil carryover in comparison to a piston compressor, however there is an air/oil separator that helps capture that. You will notice as you checkout our online store that the Reciprocating piston compressors are typically more affordable, while the Rotary Screws have a higher price tag. Another option similar to a rotary screw is a rotary vane compressor, we offer some and are very popular so check them out! For the applications you mentioned, especially when it comes to paint, we definitely recommend having a compressed air dryer along with general purpose and high efficiency filters, and a water separator/water trap as well. What this will offer your system is extremely clean and dry air - it removes all condensation/moisture/bulk liquid/particulate/oil/dirt and debris. Let us know if you have any other questions, feel free to email or call! Check out our CFM calculator if you need help estimating your air demand in CFM, and we would recommend a rotary screw for you.
You’re welcome in advance
So I have a bag house that needs .4 m3/min which I think is 14 cfm... It will be shooting air jets to clean filters . What size rotary screw do you think I need? Thanks for the video great looking compressors.
Christopher thanks for asking... you are correct .4m^3/min is roughy 14-15cfm. For this air demand we would recommend a 5HP rotary screw. We carry these machines in a tank mounted configuration, with or without a built in air treatment system. Please feel free to reach out at any time with any more questions you may have.
email info@compressedairusa.com phone 9045486200
Hi, my CP 5.5kw piston compressor vibrates pretty much. Not moving around the garage but the compressor head looks like it vibrates too much. How can i fix it? Can you show how they work at yours?
I like the quietness of the the screw style. However, if it’s in a start stop application 8hrs A day can the motor handles long term on off. It’s for my dry cleaners, I would also like to put it in my boiler room that is pretty warm in there. Any thoughts? Thanks
The rotary screw machine is best suited for high cfm loads or continuous high air demands, that is really where the 100% duty cycle shines, meaning it will run the entire work day. If you are expecting a machine to start and stop throughout the day, to supply air intermittently, then it would be more appropriate to run a reciprocating compressor. As for the boiler room placement, as long as the air is clean and dry and there is space to install and perform maintenance you should be okay. In regards to the temperature in your boiler room however, if the ambient air is too hot, that will lead to higher temperatures inside meaning more friction and could lead to issues or damage. An aftercooler would help however that only removes heat after the compression cycle.
0:44 “small foot print” ummmmmm that ain’t exactly small my man.
Respectfully, we would disagree. For a compressor that can handle a 100% duty cycle, with storage receiver and built in air treatment this machine does have a small foot print. For reciprocating air compressors to handle the same load you would need a larger machine, in addition you would also have to separately pipe in a larger receiver, air dryer, and filters.
Why would you buy reciprocating, if vane is available?
Reciprocating compressors have their place, they meet a different requirement and are also more economical. They are ideal for applications that require intermittent use of air, rather than a constant demand. An example of the difference would be using pneumatic tools versus paint spraying.
Rotary screw is superior in every respect.
A piston compressors pistons are going the wrong way half the time!
No noise comparison ?? 😤
Thanks for your comment, the noise difference between the two machines is significant. The reciprocating pistons banging away all day is much louder than the quiet purr of the rotary screws. If you have employees that work in the vicinity of the air compressor, this can be an important quality of life issue, or atleast one needing ear plugs.