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<p class="MsoNormal">Rick:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have run your question by our Director of Engineering.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Re-tubing boilers is common. Properly done, the boiler’s life is extended, not shortened. We are fans of retubing, especially on a relatively young boiler.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">How long should a boiler last? It depends greatly. A boiler should last 20 or more years, if water treatment is done properly (remove oxygen down to single digit part-per-billion range, soften/polish the hardness out, maintain an appropriate
concentration of corrosion inhibitors). <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">You mentioned that this boiler supplies humidification loads, which means 100% makeup water (process and heating boilers have return condensate, their makeup rates are much lower, 10-20% makeup). 100% makeup needs excellent water treatment
to prevent corrosion in the boiler (which causes the tube leak). If you can’t implement good treatment, you will be back in 7 years replacing tubes. With good treatment, it can go 20 years.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">One issue some facilities have with humidity-producing boilers is a desire to avoid using corrosion inhibitors as they are concerned they could be deleterious to human health when added to air. When running with no corrosion inhibitors
and a carbon steel boiler, a boiler will not last long at all.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:5.0pt;margin-right:0in;margin-bottom:5.0pt;margin-left:0in">
<span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy">Dan Maxwell</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p></o:p></span></p>
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<span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy">Sr. Project Manager</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p></o:p></span></p>
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<img width="131" height="50" style="width:1.3645in;height:.5208in" id="Picture_x0020_1" src="cid:image001.jpg@01D531BA.FE22F6C0" alt="Hallam-ICS Employee Owned"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:navy"><o:p></o:p></span></p>
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<span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy"><a href="mailto:dmaxwell@hallam-ics.com"><span style="color:navy">dmaxwell@hallam-ICS.com</span></a></span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p></o:p></span></p>
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<span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy">38 Eastwood Dr, Suite 200<o:p></o:p></span></p>
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<span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy">South Burlington, VT 05403</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p></o:p></span></p>
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<span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy">ph. - 802.658.4891</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p></o:p></span></p>
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<span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy">fax. - 802.658.1457</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#17375E"><a href="www.Hallam-ICS.com"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#17375E;text-decoration:none">www.Hallam-ICS.com</span></b></a></span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#17375E">
I </span><span style="color:#17375E"><a href="https://www.hallam-ics.com/blog"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#17375E;text-decoration:none">The Hallam-ICS Blog</span></b></a></span><b><span style="font-size:9.0pt;color:#17375E"><o:p></o:p></span></b></p>
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<p class="MsoNormal"><b>From:</b> labnetwork-bounces@mtl.mit.edu <labnetwork-bounces@mtl.mit.edu>
<b>On Behalf Of </b>Morrison, Richard H., Jr<br>
<b>Sent:</b> Wednesday, July 3, 2019 9:38 AM<br>
<b>To:</b> labnetwork@mtl.mit.edu<br>
<b>Subject:</b> [labnetwork] Steam boiler question<o:p></o:p></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 have a facility question, we have 2 steam boilers which provide heat and steam to make humidity. One boiler has tubes that have leaked and we can either re-tube the boiler (7 years old) or purchase a new boiler. What is the collective
wisdom out there around the risk of lifetime of a re-tubed boiler?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks and Happy 4<sup>th</sup><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"><o:p> </o:p></p>
<p class="MsoNormal">Richard H. Morrison<o:p></o:p></p>
<p class="MsoNormal">Principal Member of the Technical Staff<o:p></o:p></p>
<p class="MsoNormal">Draper<o:p></o:p></p>
<p class="MsoNormal">555 Technology Square<o:p></o:p></p>
<p class="MsoNormal">Cambridge, MA<o:p></o:p></p>
<p class="MsoNormal">02139-3573<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Work 617-258-3420<o:p></o:p></p>
<p class="MsoNormal">Cell 508-930-3461<o:p></o:p></p>
<p class="MsoNormal"><a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.draper.com&d=DwMFAg&c=O-BWW9H93kQVFMAc6QfJVxm9eRLMg-yhcvRQXl_QHKE&r=oftFKxzO0dBCbGyxZO_aMKUGNGTRaUafWDv8i-rpJxs&m=zCHXalAZhF_l8pNF-yQ8Nyjc8-d_wwz1aIyUYsH2Y9g&s=Te6u49Q2rOkOcAQTjjFjLhIjZH0YjwAtWsPZDpriFLI&e=">www.draper.com</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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