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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72" style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>Copper type K, silver soldered with argon purge by experienced mechanical piping contractor. This is durable and meets all piping codes. I usually use a tubing that is cleaned for oxygen service. It is ab it more expensive but takes some uncertainty out of the installation.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>CDA should be dried (-100 F dew point) and filtered. One “trick” to use if particulates are an issue---after tubing is installed run the line and vent it to a safe location…while air is flowing tap the tubing with a length of PVC pipe (2-3 ft.) staring at the compressor and following it down the line. This will help remove any particulate in the line and is low cost and easy to do. Install filters after purging out the line.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>DO NOT use PVC for compressed air. It can burst or explode. PVC in air is specifically forbidden by ASME Piping codes. Using PVC is a safety issue and a liability. It can also present insurance issues with your insurer.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>John Boyle<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>John Boyle Consulting, LLC<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>4848 Canterbury Drive<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Emmaus, PA 18049<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>484-432-7596 Cell<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>610-965-3208 Office<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='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"'> labnetwork [mailto:labnetwork-bounces@mtl.mit.edu] <b>On Behalf Of </b>Paolini, Steven<br><b>Sent:</b> Thursday, December 08, 2022 11:07 AM<br><b>To:</b> Denis, Kevin L. (GSFC-5530); labnetwork@mtl.mit.edu<br><b>Subject:</b> Re: [labnetwork] CDA and copper piping<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Kevin,<o:p></o:p></p><p class=MsoNormal> Copper is OK for CDA use but I would recommend having the joints brazed while a purge gas (argon) is flowing. Traditional soldering leaves flux residue that could migrate downstream. The new style “Propress” fittings are quite good and very clean as well.<o:p></o:p></p><p class=MsoNormal>In any event, do NOT use PVC!!!!! When PVC is overpressurized, it explodes in shards!<o:p></o:p></p><p class=MsoNormal> Equipment Dood.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal><span style='font-size:14.0pt'>Steve Paolini<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt'>Principal Equipment Engineer<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt'>Harvard University Center for Nanoscale Systems<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt'>11 Oxford St.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt'>Cambridge, MA 02138<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt'>617- 496- 9816<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt'>spaolini@cns.fas.harvard.edu<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt'>www.cns.fas.harvard.edu<o:p></o:p></span></p></div><p class=MsoNormal><o:p> </o:p></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b>From:</b> labnetwork <labnetwork-bounces@mtl.mit.edu> <b>On Behalf Of </b>Denis, Kevin L. (GSFC-5530)<br><b>Sent:</b> Wednesday, December 07, 2022 4:46 PM<br><b>To:</b> labnetwork@mtl.mit.edu<br><b>Subject:</b> [labnetwork] CDA and copper piping<o:p></o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Hello All,<o:p></o:p></p><p class=MsoNormal>Has anyone used copper piping for clean dry air lines. If not what kind of problems would one run into if going this route? Thanks for any insight that can be provided.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Regards,<br>Kevin<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>