[labnetwork] reducing noise in the chase area

[Rob Breisch]

Manish –

If you send the pump models, I would be happy let you know if silencers are available for those models, as well as if they have a factory option for enclosures.  As Richard said, Ebara as well as Edwards and Pfeiffer (Acatel/Adixen) make silencers for their dry pump products (claw, multilobe, screw, and scroll).  If you are running mainly oil sealed pumps (wet pumps) – reducing the noise from those will be more challenging.  For this reason, many facilities have moved to dry pumps with water cooled motors, as much of the noise generated by vacuum pumps comes from the motor fan on these air-cooled units.  As Richard mentioned, you have to be careful about enclosing these, because the fan is designed to move air as any restriction of this can be problematic on air cooled units.

If you have cryo pump compressors and chillers in your chase (another noise source), these also can be transitioned to water cooled to reduce some of the noise.  Obviously, you need to have sufficient PCW capacity available to make these changes.  One thing to check - these units always come from the factory with panels or enclosures.  So, if you have these units with missing panels, that would be another good place to start.

At our former factory in Austin, we had an air-cooled PCW chiller for testing water cooled pumps – it had panels, but I found that using insulating foam tape around the edges (where the panel contacts the chassis) served to reduce panel vibration, which is sometimes another source of noise.  That should not inhibit air flow for cooling - you can purchase that at your local home improvement store, Amazon, etc..

Again, if you want to share your pump models, I’d be happy to give you some info on what might be available.

Regards,

Rob Breisch
Vice President, Sales and Marketing
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     Trillium US, Inc.
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From: labnetwork <labnetwork-bounces at mtl.mit.edu> On Behalf Of Morrison, Richard H., Jr
Sent: Thursday, July 8, 2021 6:32 AM
To: Manish Keswani <manish.keswani01 at gmail.com>; labnetwork at mtl.mit.edu
Subject: Re: [labnetwork] reducing noise in the chase area

You could try to place sound enclosures around your pumps, just need to be careful of the heat buildup.

Here is a link for that:  https://www.acoustiblok.com/2018/05/15/vacuum-pump-noise-enclosures/?gclid=EAIaIQobChMI-prOk7zT8QIVj3xvBB1jcAmREAAYASAAEgK8XPD_BwE

A lot of pump suppliers ell exhaust silencers, we did that on our EBARA pumps and really reduced the noise.

Rick


Richard Morrison
PMTS
Draper Laboratory
555 Technology Square
Cambridge Ma  02139
Office: 617-258-3420
Cell: 508-930-3461



From: labnetwork <labnetwork-bounces at mtl.mit.edu<mailto:labnetwork-bounces at mtl.mit.edu>> On Behalf Of Manish Keswani
Sent: Thursday, July 8, 2021 6:10 AM
To: labnetwork at mtl.mit.edu<mailto:labnetwork at mtl.mit.edu>
Subject: [labnetwork] reducing noise in the chase area

Hello all,

We have significant noise in the chase area due to equipment and pumps. Do you know of any sound absorbing materials that are compatible with cleanroom or other noise reduction options that are effective.

Thanks so much.

Manish Keswani
Lawrence Livermore National Laboratory
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