Date: Mon, 27 Nov 2006 14:22:38 -0800
Reply-To: "Palmer, John" <jpalmer**At_Symbol_Here**UCSD.EDU>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: "Palmer, John" <jpalmer**At_Symbol_Here**UCSD.EDU>
Subject: Re: Water Hammer Hazard

General thought: Sounds like a device that needs a plastic coating (something thin that doesn't completely deaden the sound but keeps the glass from flying if broken...). Heck they have been putting netting on vacuum dewars for many, many years to prevent glass from flying everywhere. Since this is just a vacuum tube with some water in it then something similar should be done to protect from inadvertent hits or other causes of implosion. JP JOHN G. PALMER, Ph.D. DEPARTMENT OF CHEMISTRY & BIOCHEMISTRY 9500 GILMAN DRIVE - MC: 0332 LA JOLLA, CALIFORNIA 92093-0332 (858) 534-5906 FAX: (858) 534-6255 E-MAIL: jpalmer**At_Symbol_Here** -----Original Message----- From: DCHAS-L Discussion List [mailto:DCHAS-L**At_Symbol_Here**LIST.UVM.EDU] On Behalf Of Murphy, Dr. Ruth Ann Sent: Monday, November 27, 2006 12:29 PM To: DCHAS-L**At_Symbol_Here**LIST.UVM.EDU Subject: [DCHAS-L] Water Hammer Hazard Dear CHAS Members: A water hammer (lecture demonstration device) broke this month when lowered, sending glass flying in my classroom. The water hammer is designed to make a loud noise when properly lowered; however this hazard, previously unknown to me, should require strict warnings for its use, or the substitution of something safer. Ruth Ann Murphy, Ph.D. Chemistry Dept. Chairperson and Professor The University of Mary Hardin-Baylor 900 College Street Belton, TX 76513-2599 Phone (254) 295-4542 Fax (254) 295-4237

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