Date: Fri, 20 Oct 2006 10:58:23 -0500
Reply-To: Diane Amell <Diane.Amell**At_Symbol_Here**STATE.MN.US>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: Diane Amell <Diane.Amell**At_Symbol_Here**STATE.MN.US>
Subject: Re: Temperatures of Emergency Shower and Eyewash Water
Comments: To: Barbara Mowery

Not that this really adds anything new to the conversation, but ANSI 
Z358.1-2004 requires that eyewashes and showers "be activated weekly for a 
period long enough to verify operation and ensure that flushing fluid is 
available" in order "to ensure that there is a flushing fluid supply at 
the head of the device and to clear the supply line of any sediment 
build-up that could prevent fluid from being delivered to the head of the 
device and minimize microbial concentration due to sitting water."
Nonmandatory Appendix B of Z358.1 also says that a lower temperature limit 
of 60=B0F may prevent the person using the shower from developing 
We have been telling people for years that they should flush their 
eyewashes for at least three minutes weekly to reduce bacterial and 
amoebic contamination, especially  Acanthamoebae (although one senior 
staff person said that Acanthamoebae can still be a problem anyway). As 
far as temperature goes, here in Minnesota, water pipes in buildings have 
been known to freeze up in extremely cold weather and sometimes burst.  
In case anyone can use it, we developed a booklet on our requirements for 
emergency eyewashes and showers. (It is based on our enforcement policy, 
which is based on ANSI Z358.1.) It can be accessed through our web site at 
- Diane Amell, MNOSHA

>>> Barbara Mowery  10/17/06 3:22 PM >>>


We have mixing valves on our most recently installed drench hoses and 
eyewashes; I have not checked the actual temp, but it feels pleasant.   
However, I have run into a problem with  the mixing valves-on my 
monthly checks I found some with low flow rates which I reported to 
maintenance. The person who fixed that said the mixing valves are prone 
to clogging, partly from lack of use, and need to be checked weekly, 
allowing them to run for several minutes.  Of course, that is still 
preferable to having an injured person refuse to rinse as long as 
necessary because of the ice cold water.

I'm not sure about safety showers and will check ASAP.

Barbara Mowery
Laboratory Coordinator
Department of Physical Sciences
York College of PA
Country Club Road
York PA 17405

Quoting "Greene, Ben" :

> Colleagues - With previous discussions regarding "tepid" water temperatur
> required by ANSI Z358.1-2004 in mind, I was curious what other facilities

> have measured the temperatures of their delivered water and what the 
> were.  With the low end of "tepid" being 60 F (Appendix B), it might 
> cold for a dip but not for a, uh, soft drink.  We recently measured the
> temperatures of water from more than a dozen units (both eyewash and
> emergency showers, indoor and outdoor), and found a mean temperature of 
72 F
> at an ambient outdoor temperature of 75 F; safely above the 60 F  
> Of course, we expect seasonal variation and plan to measure the 
> periodically in the future to determine if mixing units are required.
> We are in southern New Mexico which has a nominally mild climate (though 
> does cool down in the winter) and I wondered what the delivered water
> temperatures at facilities in other parts of the country are.
> Ben
> Ben Greene, Ph.D.
> Jacobs
> Las Cruces, NM

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