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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>This is the response from my Facility Engineer, Jeff Kuhn.
I hope it is helpful.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>John<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Kuhn, Jeffrey G <br>
<b>Sent:</b> Tuesday, August 26, 2008 4:11 PM<br>
<b>To:</b> Weaver, John R; Voorhis, Mark L.<br>
<b>Subject:</b> RE: [labnetwork] Compressed Air??<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>John,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Our Kobelco compressor is oil free, but Kobelco’s smallest
model is a bit large for his needs. I’ve not been wild about Kobelco
reliability either. I’m told that our compressor failed shortly after
installation here at Birck.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>There are oil vapor filters available that can produce medical
grade CDA using carbon filtration. They would probably reduce hydrocarbon
carryover to acceptable levels, but I think it is better to use an oil free
compressor. An oil vapor filter adds a potential failure mode and additional
maintenance to the system. The ramifications of filter failure could be severe.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I don’t have a recommendation for a specific model, but
Ingersoll-Rand manufactures several versions of oil-free rotary screw
compressors. I used them in the past with good success. They also offer smaller
units in the capacity range Dave is seeking. The downside is that they can be
expensive.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Jeff<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal style='margin-left:.5in'><b><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> Weaver, John R <br>
<b>Sent:</b> Tuesday, August 26, 2008 3:32 PM<br>
<b>To:</b> Voorhis, Mark L.; Kuhn, Jeffrey G<br>
<b>Subject:</b> FW: [labnetwork] Compressed Air??<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'>Any thoughts for Dave
Frankel? His e-mail is below.<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal style='margin-left:.5in'><b><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> labnetwork-bounces@mtl.mit.edu
[mailto:labnetwork-bounces@mtl.mit.edu] <b>On Behalf Of </b>David Frankel<br>
<b>Sent:</b> Tuesday, August 26, 2008 10:15 AM<br>
<b>To:</b> labnetwork@mtl.mit.edu<br>
<b>Subject:</b> [labnetwork] Compressed Air??<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:10.0pt;
font-family:"Arial","sans-serif"'>I have a compressed air problem and am
looking for suggestions:</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:10.0pt;
font-family:"Arial","sans-serif"'>We have a 7.5hp dry piston air compressor
supplying our modest (around 3000 sq. ft.) clean room and a number of other
non-clean room research labs. Presently our average steady usage is
around 8 cfm of compressed air. Our air compressor has become unreliable
and I am looking into alternatives. Previously we had a smaller dry scroll
compressor which did not stand up to heavy use. </span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:10.0pt;
font-family:"Arial","sans-serif"'> </span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:10.0pt;
font-family:"Arial","sans-serif"'>Does anyone have experience with using an
oil-lubricated air compressor with filters to reduce hydrocarbon
carryover? Does that work or is an oil-lubricated compressor a bad
idea? </span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:10.0pt;
font-family:"Arial","sans-serif"'> </span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:10.0pt;
font-family:"Arial","sans-serif"'>Any recommendations on reliable oil-less air
compressors in the 7.5-10 hp (around 30 cfm ) range? </span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:10.0pt;
font-family:"Arial","sans-serif"'> </span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:10.0pt;
font-family:"Arial","sans-serif"'>Thanks,</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:10.0pt;
font-family:"Arial","sans-serif"'>David</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:10.0pt;
font-family:"Arial","sans-serif"'> </span><o:p></o:p></p>
<p class=MsoAutoSig style='margin-left:.5in'><span style='font-size:10.0pt;
font-family:"Comic Sans MS"'>David J. Frankel, Senior Research Scientist</span><o:p></o:p></p>
<p class=MsoAutoSig style='margin-left:.5in'><span style='font-size:10.0pt;
font-family:"Comic Sans MS"'>Laboratory for Surface Science & Technology</span><o:p></o:p></p>
<p class=MsoAutoSig style='margin-left:.5in'><span style='font-size:10.0pt;
font-family:"Comic Sans MS"'>University of Maine</span><o:p></o:p></p>
<p class=MsoAutoSig style='margin-left:.5in'><span style='font-size:10.0pt;
font-family:"Comic Sans MS"'>5708 Barrows/ESRB</span><o:p></o:p></p>
<p class=MsoAutoSig style='margin-left:.5in'><span style='font-size:10.0pt;
font-family:"Comic Sans MS"'>Orono, ME 04469</span><o:p></o:p></p>
<p class=MsoAutoSig style='margin-left:.5in'><span style='font-size:10.0pt;
font-family:"Microsoft Sans Serif","sans-serif"'> </span><o:p></o:p></p>
<p class=MsoAutoSig style='margin-left:.5in'><span style='font-size:10.0pt;
font-family:"Comic Sans MS"'>207-581-2256</span><o:p></o:p></p>
<p class=MsoAutoSig style='margin-left:.5in'><span style='font-size:10.0pt;
font-family:"Comic Sans MS"'>207-581-2255 fax</span><o:p></o:p></p>
<p class=MsoAutoSig style='margin-left:.5in'><span style='font-size:10.0pt;
font-family:"Microsoft Sans Serif","sans-serif"'><a
href="mailto:frankel@maine.edu"><em><span style='font-family:"Comic Sans MS"'>frankel@maine.edu</span></em></a></span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'> <o:p></o:p></p>
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