JimmyJoeBob
Member
- Joined
- Sep 25, 2012
- Messages
- 14
As if my leroi wasn't enough, I brought this baby back to my house today. 120 gallon 4 cylinders 2 stage with the 447 devair/devilbiss pump. Yeah...i've wanted a 447 for a while.
As if my leroi wasn't enough, I brought this baby back to my house today. 120 gallon 4 cylinders 2 stage with the 447 devair/devilbiss pump. Yeah...i've wanted a 447 for a while.
That's a monster! Mind telling us what you paid for it? What will you use it for?
Scott
That's a monster! Mind telling us what you paid for it? What will you use it for?
Scott
Awesome machine. I'd love a devilbiss 445 or 447 if I could find one.As if my leroi wasn't enough, I brought this baby back to my house today. 120 gallon 4 cylinders 2 stage with the 447 devair/devilbiss pump. Yeah...i've wanted a 447 for a while.
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You can run the 447 on 7.5hp, thats the limit as it needs 500rpm minimun.
It says so on the pumppapers, but it's never been commerciallized as such.
I wanted something to max out 240V. Can't find 15hp single phase, too rare and only in closed frame motors, so even more expensive.
Nice 247 right there Ross, My friend would love it. Only reason he can't take my Dresser (18.5 cfm at 175psi) is because my dresser is horinzontal. Btw, ill be swapping to those filter you have on yours.
People dont realise how big they are until they have one in front of them. Even your 247 is massive . My pump alone weight 425lbs and 24 inches high by 30 inches lenght and 24 inches width.
Cant wait to get it off the truck and inside to play with it![]()


John,
looks awesome bro! I have a QT7.5
Do you mind sharing the brand/model # of those regulator/filter combo you show on that pic under the outlets?
I need to upgrade mine. Thanks!

The large uprights are a bit sketchy to move as they are top heavy. My 5 HP 60 gallon I got neighbour to lift off back of truck and move it in.
...As for moisture, I have an air dryer and the milling machine has traps on it. No reason you couldn't plumb this compressor like any other.

Sorry this is SO far past when you originally quoted - and maybe this is answered further into the thread (I'm new to the forum and have only gotten this far into the thread so far) - but since there's no receiver on a rotary screw, wouldn't the output air be even harder to dry, because there's nowhere for the moisture vapor to 'condense out' of the air stream??
And, if the above assumption is correct, wouldn't that mean installing a higher-capacity air dryer and thus increasing cost/complexity?
Believe me, I'm not married to recip compressors - I actually like the idea of rotary screw units - I'm just confused about getting the moisture out of the air...![]()
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Most of the screw-type compressors that I have seen, at various places of employment, were set up with twin-tower desiccant air dryers on their outputs, with automatic controls. One tower is in the air stream at all times, while the other is getting regenerated (heated to remove the moisture).
Educated guess: the same amount.So, just out of curiosity, do rotary screw compressors create more/less/same amount of condensate as recip piston units, per volume of air?


OK - here's my contribution:
"New to me" 80's era Champion VR5-8 5HP 80 gallon compressor, w/a R15-A pump and a relatively new 5HP single phase (converted from original 3 phase by prior owner) I just unloaded at my place in exchange for three short days' labor helping an old friend move... rated at 17.3CFM delivery @ 175psi. Also got the magnetic starter you see attached to the receiver and a wall-mounted 60A disconnect as well - just need to get that much power out to my garage, wire it all back together, plumb some lines and I'm off to the races.
Along with the compressor I scored a cast iron Vermont Castings Dauntless woodstove + all the stainless steel Metalbestos chimney I need to vent it out a side wall on my first floor and all the way up past my second floor to clear the roof rake! You can see the back of the stove in the background of the photo - haven't had time/money to do anything with either, since I'm renovating my house out-of-pocket as well.
I know the compressor runs - seemed to take 15-20 minutes to fully charge the tank to 175psi, then through a series of 6 cycles it averaged just under 2 minutes to recharge from 140 psi... not sure if this is normal/fast/slow, but the recharge rate is reliable so not too worried.
Can anyone tell me if those charge/recharge cycle times are way off?!? Also, what particular stuff should I be looking for with the tank being a 1980 vintage? I'm not sure how any other previous owners cared for the beast, but the PO (my friend) didn't use it terribly often and I'm pretty sure the tank was drained regularly as the guy is pretty careful - almost OCD - about his tools.
I hope to have the woodstove in by next winter and the compressor has to wait until I either get a big enough generator to run it or get the time/money to better wire the detached garage where it's stored... my wife heard it running and quickly put an end to my plan of putting it in my basement!
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Wow! This thread is popular! I thought I may have already replied but couldn't find anything in a search so here's my compressor.
You're welcome. The "real numbers" were a little lower than I was hoping for when I finished my compressor build as well. I built a Franken-compressor with an Emglo L pump (ca. 1983), 3hp GE motor (ca. 1974) and a 30gal, 200psi tank.Wow - I did not know that formula... Extremely helpful - if undesired - information...
On the plus side, 12.5cfm isn't all that shabby - and considering the cost and ready availability of repair parts, not an insurmountable issue.
Thanks, sld961!
Sent from my iPhone using Tapatalk




You're welcome. The "real numbers" were a little lower than I was hoping for when I finished my compressor build as well. I built a Franken-compressor with an Emglo L pump (ca. 1983), 3hp GE motor (ca. 1974) and a 30gal, 200psi tank.
The cfm listed in the pump literature was quite high. I didn't expect to get 21cfm with a 3hp, but I was hoping it was in the high teens. It ended up at 13cfm from 0 to 120psi, then 12cfm from 120 to 140psi, which is about where you would expect a 3hp to be. Overall I'm pleased with the results. Still need to clean the tank up and paint it.
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You pretty much nailed it. The extra tank is a former "hot water maker", ASME coded tank I picked up free (500 gallon). I had my youngest son inside the tank after installing to clean it out! My former compressors' tank rusted out (1941) so I installed a automatic tank drain my boss gave me on a replacement tank and subsequently transferred it to the new system. It blows down every 15 minutes. New compressor is a 5 HP, 17.2 CFM @ 175PSI. I purchased 2 Quincy filters and spare cartridges for each. The refrigerated dryer is valved in a by-pass so I don't have to run it continuously.
Mike
Busted! Yes, that is schedule 40 PVC that I installed before I read about it on here. I have not replaced it yet. I will be replacing it with copper.
