From: "Wilhelm, Monique" <mwilhelm**At_Symbol_Here**UMFLINT.EDU>
Subject: Re: [DCHAS-L] risks associated with central vacuum pumps
Date: Thu, 10 Aug 2017 16:09:42 +0000
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Message-ID: 1109037139E1524980CF9CBEB2476618010AF8E6AD**At_Symbol_Here**

We always use point of use traps and high VP chemicals are removed by rotary evaporator, not just filtration, with a cooled condenser to be sure to trap them.  The type of cooled condenser used is based on solvent.  I do not know what type of pump we have.


Monique Wilhelm

Laboratory Manager

Department of Chemistry & Biochemistry

University of Michigan - Flint


From: ACS Division of Chemical Health and Safety [mailto:DCHAS-L**At_Symbol_Here**PRINCETON.EDU] On Behalf Of Victoria Carhart
Sent: Thursday, August 10, 2017 11:10 AM
Subject: [DCHAS-L] risks associated with central vacuum pumps


Hi all,


Here at UVM we have recently moved into a new STEM building (currently containing all of our chemistry and physics labs and a handful of engineering labs) with a central vacuum pump. We previously used tap water aspirators in the old chemistry building. Currently, a Rotary Claw is installed that I'm told is the same as at SUNY Buffalo, George Mason, Harvard FAS, and U Mass Boston. Since we use this to pull vacuum on apparatus containing various solvents, we are being advised to switch to a rotary vane pump like the ones in use at U Pittsburgh, U Maryland, Duke, and Boston College. The risk, as I understand it, is based on certain chemicals' high vapor pressure and low concentration to achieve LEL. Diethyl ether is the usual example here, but hexanes and other common lab solvents also fit this description. I have three questions in particular:

  1. Do you have procedural controls that restrict the use of any chemicals in apparatus connected to the house vacuum?
  2. Do you use point-of-use traps to avoid chemicals traveling to the pump?
  3. Do you know of any case where a house vacuum system has achieved LEL (or even 10% of LEL) due to lab operations?

Thanks for your time and help!




Victoria Carhart

Laboratory Safety Coordinator, CAS/RSENR

UVM's Risk Management and Safety

Environmental Safety Facility

667 Spear Street

Burlington, VT 05405



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