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Matching Compressor Capacity to Air-Assisted Spray Guns
Question
Forum Responses
From contributor K: To the original questioner: I understand your confusion and apologize for it. Contributor D is correct. The pump only uses 1.1 cfm to operate, but the gun uses 3 to 4 cfm for the atomization air. As a system, your total air consumption is around 5 cfm total. You can run this system off of most 5 hp compressors from your local hardware store or even an industrial grade pancake compressor with a 1.5 hp motor. Just so you know, a residential rated compressor does not produce as much air volume as an industrial compressor with the same hp rating. From contributor B: The 10:14 system uses nothing compared to the average HVLP setup. The difference is something like 6cfm (krem) vs. 17cfm-20+ (hvlp). And home depot compressors usually bog down with HVLP setups. From the original questioner: I have to say that I am still pretty confused. My 2 HP Emglow only puts out about 3.5 cfm if I am not mistaken. I don't know of any pancake that puts out more than about 2 so how can you run a 10:14 and MVX on that if combined they require 5 cfm? My 5 HP two stage Ingersoll only puts out 17 at 90psi. Upon further reading of the literature perhaps the discrepancy is where it says Inlet Air Pressure Range 20-87 psi. Now maybe my Emglow will do 5 at 50 psi. How often do you have to provide 87 psi to the 10:14? What is the usual range? It can't be over 50 if people are using pancake compressors. From contributor R: To the original questioner: Here's what I use at my finish room. I use a Kremlin 10:1 and my setup is: 10 to 30 psi air and 20 to 50 on the fluid, on mine the air is on the left and fluid is on the right. I have used a 20 gallon 4 hp compressor. Also when you do onsite work, your compressor will seem to constantly run and run. So here's what I have done and it works perfect and if you can even afford a small electric airless I would suggest getting one. I only use the Kremlin in our shop because we have a large compressor and with an electric airless its just plug and play. I use a small Graco with a 4:10 ultra fine tip. You cant go wrong. You can cut your material just like using conventional or just spray it straight. Also - you alleviate having to pack a compressor with you .If I were you and even if you have to dig into your wallet again I would suggest going for the electric airless and use the Kremlin for smaller projects. I use the electric airless for catalyzed lacquers and catalyzed varnishes. You can shoot pigmented lacquers and varnishes too just make sure to keep it clean.
From contributor R: I have taken my Kremlin 10:14 on-site. The largest compressor I've used is a 3HP (and I doubt it's really 3HP) 20 gallon. It handles it quite well; it does not run all the time. I think it could be run off my 1.5 or 2hp Emglo (the little twin tank, 4 gallon pick it up by the handle) if the spraying was light and intermittent. From contributor J: To the original questioner: When looking at compressors look for deliverable cfm, this is the only number that counts. Then match that up to your needs. From contributor B: If you want to shoot fast with your AAA, just put a larger flow rate tip in it. I know that Sata makes tips with flow rates up to 53 oz/min and a 14" fan - normal flow rates are in the 10 to 15 oz/min range. With AAA you have the added benefit of excellent transfer efficiency and reduced overspray. Most will run off of a small 3 hp compressor as well.
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