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Old 09-23-2009, 05:12 PM
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air compressor and piping

i have a sears air compressor, 5 hp.30gal tank.single stage. it says scfm@ 40 is 7.8 and scfm@ 90 is 5.8. right now using air tools i have to wait for it to build presser back up. i plan on sanding and painting my car next summer. i have a water trap and regulator and running an air hose for the tools 1/2 inch. my ? is if i run 3/4 inch pipe around my room (its 12x24) and put in the drain valves. would the 3/4 help with air flow or would it be a wast of time and money. and is there any one that has a drawing of a layout of how to do it. i was lead to this site a few wks back and this is my first post , the info is amazing. thank you all
( i am restoring a 67 mustang fastback 289 auto )

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Old 09-28-2009, 08:02 AM
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I hate to be the bearer of bad news. But, your compressor isn't going to be enough. Even if you were to add all the piping you could afford for extra volume, you still do not have enough CFM from the pump.

Most D/A sanders will eat approx 13-17 CFM @ 90psi under load. A lot of them will advertise the free load CFM and not the loaded CFM. Most spray equipment will use in the neighborhood of 8-17 CFM @ approx 30-40psi.

I managed to get by with a 60 gallon Coleman Powermate producing 10.5 CFM @ 90 and 13.5 @ 40psi for 11 years. It has since puked and I am in the process of shopping for an industrial model in the area of 20 CFM @ 175PSI (I make money with mine now).

A bigger compressor will require 230v and the associated wiring to go with it, but in the end you will be a lot less frustrated. You can purchase the minimum of 60 gallon compressors for around $4-600 depending on brand. I would shop for one that will produce 12.5 CFM @100 PSI.

My $.02

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Old 09-28-2009, 08:07 AM
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pipin info

do a search. there is a lot of info here DO NOt USE PVC piping... Piping should run down hill with a drain at the end and air outlets should point up then U down so to not collect dust or spit out condensation. I knew a guy tthat got a 100 gal tank from a junk commercial compressor and ran his compressor to fill the tank so he could have enough air to spray. Old tanks should be carefully inspected and tested.
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