<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Brian,<div class=""><br class=""></div><div class="">We use three Busch dry pumps (Virginia Beach, VA) for house vacuum, which are connected to a substantial ballast tank.</div><div class=""><br class=""></div><div class=""><a href="http://www.buschusa.com/products/product-portfolio/mink/info/" class="">http://www.buschusa.com/products/product-portfolio/mink/info/</a></div><div class=""><br class=""></div><div class="">We’ve had zero issues with premature failure; they’ve been running continuously for over two years and we perform maintenance on them semi-annually. Attached are a couple of photos of the house vacuum skid.</div><div class=""><br class=""></div><div class="">Best,</div><div class="">Noah Clay</div><div class=""><br class=""></div><div class=""><i class="">Quattrone Nanofabrication Facility</i></div><div class=""><i class="">University of Pennsylvania</i></div><div class=""><i class="">Philadelphia, PA</i></div><div class=""><br class=""></div><div class=""><img apple-inline="yes" id="E90D6DA1-1666-4E2E-A67A-6F55C52D067C" height="640" width="640" apple-width="yes" apple-height="yes" src="cid:96D32F61-3C8F-47D3-A785-11F82A12C1F7@seas.upenn.edu" class=""><img apple-inline="yes" id="933AFC23-B374-43EA-A658-975A03E63B8F" height="640" width="640" apple-width="yes" apple-height="yes" src="cid:C53010E5-9D83-42A5-8B4F-406761D20961@seas.upenn.edu" class=""></div><div class=""><br class=""></div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Aug 12, 2015, at 12:53 AM, Bryant Colwill <<a href="mailto:colwib2@rpi.edu" class="">colwib2@rpi.edu</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">
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Colleagues,<br class="">
<br class="">
We are in need of repairing/replacing our cleanroom process vacuum
pumps.<br class="">
Currently, we use a water sealed rotary vane system but it has been
suggested to convert to a oil sealed rotary screw style pump.<br class="">
We target an ultimate vacuum of 28mmHg and our volume requirements,
at point of use, are quite small (a couple spin chucks, end
effectors, etc.). Can anyone attest to having a rotary screw pump
installed for this purpose that has withstood the test of time? Any
issues with premature/frequent bearing failure or replacement?
Also, does changing from water sealed to oil sealed set off any red
flags? <br class="">
<br class="">
Thanks in advance,<br class="">
Bryant<br class="">
<br class="">
<span class=""><span style="color:#888888" class="">Bryant Colwill </span></span><span style="color:#888888" class=""><br class="">
<span class="">MNCR General Manager</span><br class="">
<span class="">Rensselaer Polytechnic Institute </span><br class="">
<span class="">110 8th Street, CII 6015 </span><br class="">
<span class="">Troy, NY 12180 </span><br class="">
<span class="">Ph: <a moz-do-not-send="true" href="tel:518-276-3946" value="+15182763946" target="_blank" class="">518-276-3946</a> </span></span><br class="">
</div>
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