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Rotary Screw Air Compressors

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bobbyr

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Aug 19, 2009
Messages
5
in my opinion if you are going to or want good air flow that stays consistant then a srew is the only way to go they cost more but they can sure put out the air i have 3 screws 1 portable for my blast rig 1 to run my shop and i just came across one more that i could not turn down for the price i am going to install it as a back up unit and get rid of my 2 t-30 ingersalls that currently run the shop while i am servcing the screw
 
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revlover

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Mar 27, 2008
Messages
264
Demand would be pretty low. Just for my garage at home. I was thinking of installing it into an enclosure outside and then pipe the air into the garage. Just for those times where I'm working on something then think, "man, it would be nice to have some air right now..."
 
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Gary S

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Dec 27, 2008
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Location
Bismarck, ND
We have the I-R rotary screw compressors at work. They make an incredible amount of noise, far worse than even a small oilless compressor.
 
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rwhite692

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Mar 4, 2008
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Location
Central Valley, CA
The BendPak rotary screw that you provided the link to, is a 15HP unit with around 60CFM at 150PSI...

That is probably more CFM than you would need in a home garage.

I haven't seen many rotary screw machines that were much smaller than 15HP.

With a rotary you are paying for the higher duty cycle capability (longer life) and generally lower maintenance costs vs. a reciprocating compressor of similar size.

as to them being quieter, yes, HP for HP they are quieter than reciprocating compressors of similar size...
 
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revlover

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mechamunch said:
:headscrat Uhh...well, if I was rolling in dough and could afford absolutely anything I might consider a rotary screw compressor. But for normal home-garage type applications, you're probably better off with one of their Trimaxes instead.

http://www.bendpak.com/bendpak-products/air-compressors/LS580V-501.aspx

I don't even know if there is such a thing as a consumer-level rotary screw air compressor.
Click to expand...

Gary S said:
We have the I-R rotary screw compressors at work. They make an incredible amount of noise, far worse than even a small oilless compressor.
Click to expand...

I know it's probably a bit overkill, but according to their ad it says that people could have a normal conversation while it's running. That's nice being that I'm in a suburban environment.
 
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litljay

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Jun 26, 2009
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Fresno, CA
I don't know if I would necessarily classify them as "quiet" as much as I would say the noise is different than a piston compressor.
We have a 75hp and a 30hp in our plant (75hp doesn't kick on until needed). There's no way a "normal conversation" is occurring during operation of either one.
 
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Gary S

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revlover said:
I know it's probably a bit overkill, but according to their ad it says that people could have a normal conversation while it's running. That's nice being that I'm in a suburban environment.
Click to expand...


Not with the models we have. They are so loud that there is no way to talk to anyone in the same room with the compressors. I'd bet that they are right near the upper levels that OSHA requires hearing protection.
 
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Tallboy

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Mar 3, 2008
Messages
52
At work we have a 22HP Kaeser SFC frequency drive for our primary compressor and 25HP direct drive unit for a backup. You can stand next to the both, but particularly the AC Frequency drive unit and hold a conversation without raising your voice. Nice unit.
 
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rsanter

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Dec 22, 2007
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Location
visalia ca
we have 2 of the 50hp atlas copco compressors here at work

if you have the need for lots of air, then get it
if you need lots of air all day but your demand varies greatly over the day then you may want to look at the version with the variable speed drive. the VSD will save money in energy

bob
 
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rwhite692

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Location
Central Valley, CA
If your central concern is noise, why not just get a reciprocating compressor with a large two stage pump running at a low (700-800) pump RPM?

I recently built a 120-gallon compressor configured this way for my garage/shop because I wanted something quiet that put out enough air to run a media blast cabinet. I have about $300 total into it. The video below makes it sound louder than it is, you can definitely have a normal conversation when standing right next to it.

2064971450011691741S500x500Q85.jpg


2225207580011691741S500x500Q85.jpg


2775986860011691741S500x500Q85.jpg


<embed src="http://p.webshots.com/flash/smallplayer.swf?videoFile=http://videoserve.webshots.com/video/32548/3027267980011691741QaCCLp_v_0.flv&audio=on&displayImagePreview=http://videothumb29.webshots.com/thumb/32548/3027267980011691741QaCCLpstill_002_0.jpg&videoPageUrl=http://good-times.webshots.com/video/3027267980011691741QaCCLp&autoPlay=false&shareLink=http://cards.webshots.com/ecard/personalize?photoId=3027267980011691741%26source=v" type="application/x-shockwave-flash" wmode="transparent" width="425" height="350" quality="best" allowscriptaccess="always"></embed>

<a href="http://good-times.webshots.com/video/3027267980011691741QaCCLp">DSCF2340.AVI</a>
 
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tcianci

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Feb 7, 2009
Messages
4,242
Location
Walpole, Ma
A rotary screw compressor for a home shop?? 60 CFM? Do you have 208 three phase power at your house? I have run sites where we had the Atlas Copco fixed speed and VSD units for a three shift 200,000 sq ft manufacturing facility. Nothing quiet about these machines. They also throw an incredible amount of heat. In fact in the winter time I would duct just the VSD into the building and heat a 3000 sq ft loading dock! At 60 cfm, you could open a valve, blow half your air out the window and still have twice the air you would need for a good sized blast cabinet. IMHO, I would opt for a nice 2 stage low RPM piston machine that would cost you less than the install for the screw compressor.
 
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Industrial Concepts

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Joined
Nov 25, 2007
Messages
97
revlover said:
Demand would be pretty low. Just for my garage at home. I was thinking of installing it into an enclosure outside and then pipe the air into the garage. Just for those times where I'm working on something then think, "man, it would be nice to have some air right now..."
Click to expand...

Typically a Srew Compressor is for higher demand shops. Most of the compressor mfg. make units with sound enclosures ( 68 dba). I just installed a Quincy QT Extreme 7.5 hp recip compressor for Auto Repair shop, nice compressor with enclosure again in the sound level was in the 68 dba range.
Price was around $3,700.00 range. Bel-aire has one around $2,800.00.
 
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revlover

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Mar 27, 2008
Messages
264
tcianci said:
A rotary screw compressor for a home shop?? 60 CFM? Do you have 208 three phase power at your house? I have run sites where we had the Atlas Copco fixed speed and VSD units for a three shift 200,000 sq ft manufacturing facility. Nothing quiet about these machines. They also throw an incredible amount of heat. In fact in the winter time I would duct just the VSD into the building and heat a 3000 sq ft loading dock! At 60 cfm, you could open a valve, blow half your air out the window and still have twice the air you would need for a good sized blast cabinet.
Click to expand...

LOL... definite overkill for my use... :thumbup:


Industrial Concepts said:
Typically a Srew Compressor is for higher demand shops. Most of the compressor mfg. make units with sound enclosures ( 68 dba). I just installed a Quincy QT Extreme 7.5 hp recip compressor for Auto Repair shop, nice compressor with enclosure again in the sound level was in the 68 dba range.
Price was around $3,700.00 range. Bel-aire has one around $2,800.00.
Click to expand...

I'll probably go in this direction.

Thanks for your comments everyone!
 
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Dale B

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Joined
Jan 5, 2009
Messages
875
Location
Rowland Hts , SoCal
Here's a Kaeser near LAX in So Calif.. Its on C/L
kaeser air compressor ab 700 t - $3500 (south bay)

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Date: 2009-10-06, 10:50AM PDT
Reply to: [email protected] [Errors when replying to ads?]

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Kaeser oil less compressor......................
Item number Air Box AB 700 T ..............
5 hp 24.7 cfm 175 psi..............................
KRD 015 air dryer.....................................
30 gallon tank............................................
low hours 1036..........................................
Complete with manuals............................
Can help deliver in the greater Southern Califorina area.
Compressor is 240V and dryer is 115V
Any ?s please ask

$3500.00 obo



Location: south bay
it's NOT ok to contact this poster with services or other commercial interests



PostingID: 1409141013


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