Hi Martin,

Our policy is to simply not travel in an elevator with liquid nitrogen. We tell personnel to place the container inside the elevator and place this sign on it facing the door: http://www.drs.illinois.edu/site-documents/LiquidNitrogenSignElevator.pdf. We include this information in our cryogen guidance document: https://www.drs.illinois.edu/SafetyLibrary/CryogensAndDryIce.

Brian Meschewski

Research Safety Professional

Division of Research Safety

University of Illinois at Urbana-Champaign

(217)333-2423

bmesche2**At_Symbol_Here**illinois.edu

From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU> On Behalf Of Bell,Martin
Sent: Friday, May 11, 2018 7:54 AM
To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
Subject: Re: [DCHAS-L] Elevator Entrapment while Transporting a Liquid Nitrogen Dewar

Good morning,

We recently had an incident where a researcher was momentarily trapped in an elevator while transporting a 230 liter Dewar of liquid nitrogen. Thankfully the researcher walked out of the elevator a few seconds later.

This incident raised a concern about the potential for asphyxiation if an entrapment occurred and the Dewar released nitrogen gas into the elevator cab (unlikely but need to prepare). We have elevator rescue protocols in place but the response time depends on the time of day.

Has anyone addressed this type of concern?

Martin W. Bell, M.S. CIH CSP

Director, Environmental Compliance

Department of Environmental Health and Safety

Drexel University

400 North 31st Street

Philadelphia, PA 19104

Tel: 215.895.5892 | Fax: 215.895.5926

Mobile: 215-778-4278

drexel.edu/facilities/healthsafety

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