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<p class="MsoNormal"><span style="color:#1F497D">Richard,<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">We haven’t switched to onsite generation for the fab, but we (Harvard) have looked at it. The Harvard fab has a 9000 gallon LN2- 3ä storage that gets re-filled approximately once a week. The storage facility
occupies approximately 300 GSF, and there is no more real estate available for this purpose. Based upon a much smaller on-site generator recently completed, on-site generation to replace the fab storage facility would require more real estate than is available.
Part of the demand for space is the self-imposed requirement for N+1 redundancy. This also affects the capital budget.<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">But if saving money is your focus, I suggest that your discussion should be focused on the purity of your gas requirements. Locally generated 1ä gas is
<s>inexpensive</s> cheap to produce. Locally generated 3ä gas is moderately expensive to produce. Locally generated 6ä gas is
<b>very</b> expensive to produce. From the refinery, 3ä gas is all that is produced and transported. What we at Harvard use is 6ä gas (3ä gas run through a purifier). An unofficial audit has shown that less than 10% of our usage actually demands 6ä purity.<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">Want to save money? Figure out your demand by purity and segregate the flows (piping). Provide your pump and gas cabinet purges with on-site generated 1ä gas. Your facility will save.<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">Tom Tribble<o:p></o:p></span></p>
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<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-bounces@mtl.mit.edu [mailto:labnetwork-bounces@mtl.mit.edu]
<b>On Behalf Of </b>Morrison, Richard H., Jr.<br>
<b>Sent:</b> Tuesday, March 24, 2015 12:04 PM<br>
<b>To:</b> labnetwork@mtl.mit.edu<br>
<b>Subject:</b> [labnetwork] LN2 vs N2 generation on site<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi everyone,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am paying >$220K per year for LN2 to generate Nitrogen for my fab. Have any of you guys switched to onsite Nitrogen generator?
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Looking for ideas on:<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:.5in">Cost of system<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:.5in">Maintenance cost of system <o:p></o:p></p>
<p class="MsoNormal" style="text-indent:.5in"> Quality of the Nitrogen.<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:.5in">Operating cost per CuFt of Nitrogen<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Rick<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Draper Laboratory<o:p></o:p></p>
<p class="MsoNormal">Principal Member of the Technical Staff<o:p></o:p></p>
<p class="MsoNormal">Group Leader Microfabrication Operations<o:p></o:p></p>
<p class="MsoNormal">555 Technology Square<o:p></o:p></p>
<p class="MsoNormal">Cambridge Ma, 02139-3563<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><a href="http://www.draper.com">www.draper.com</a><o:p></o:p></p>
<p class="MsoNormal"><a href="mailto:rmorrison@draper.com">rmorrison@draper.com</a><o:p></o:p></p>
<p class="MsoNormal">W 617-258-3420<o:p></o:p></p>
<p class="MsoNormal">C 508-930-3461<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif"">Notice: This email and any attachments may contain proprietary (Draper non-public) and/or export-controlled information of Draper Laboratory. If you are not the intended
recipient of this email, please immediately notify the sender by replying to this email and immediately destroy all copies of this email.
<o:p></o:p></span></p>
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