Date: Tue, 10 Apr 2007 20:06:00 -0400
Reply-To: ILPI <info**At_Symbol_Here**ILPI.COM>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: ILPI <info**At_Symbol_Here**ILPI.COM>
Subject: Tepid Water (Was: Definition of Acceptable Distance...)

At 3:25 PM -0700 4/10/07, Alan Hall wrote:
>As a voting member of the ISEA/ANSI Z358.1 Revision Committee with 
>our next meeting in Baltimore in May, I can use all the input I can 
>Also, does anyone in the group have a reasonable notion of actual 
>temperatures of "tepid" water?  We grappled with that a great deal 
>at our last meeting in the Chicago area and could not come to a 
>satisfactory description other that "lukewarm".

I thought that temperature range was already in the standard...don't 
have a copy at hand, though.

If we apply the axiomatic "flush with water for 15 minutes" rule 
(wherever that bit of lore came from), then lukewarm should be a 
temperature that does not induce hypothermia, chills, or 
hyperthermia.   Considering that an injured person may already be in 
shock; dousing them with cold water for 15 minutes is not only 
dangerous, but it is hard to convince a conscious person to stay 
under a cold shower for that long and they may end their first aid 
treatment before it has been fully effective.

The Thermostatic Mixing Valves (TMV's) that we sell as Guardian 
Equipment distributors are designed to deliver water at 85 F (29 C). 
Based on ANSI, they define that range as 60 to 90 degrees F (15 to 32 
C), which, based on personal experience with shower emergencies, is a 
fairly good definition.   See

85 F is also outside the danger zone on hypothermia charts, even for 
indefinite exposure.  See, for example:

Based on that chart, I'd aim for 85 F +/- 10 degrees.

Best regards,

Rob Toreki
Safety Emporium - Lab & Safety Supplies featuring brand names
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