First, the 2004 standard specifies that tepid flushing fluid must be supplied. Second, the scope of emergency fixtures is widened. The 1998 standard only addresses personal eyewash equipment.

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Lastly, the temperature range of "tepid" water is mentioned. The ANSI standard states that each application and situation must be evaluated on a case by case basis. However, as a general rule, 100-degrees Fahrenheit is probably the highest temperature water should be, while the lower end should be 60-degrees Fahrenheit. The appendices indicate that temperatures over 100 degrees may intensify chemical burns to the skin and eyes, and hypothermia becomes a concern on the lower end of the scale.

Tepid Water: In previous versions of the ANSI Z358.1 standard, tepid water was mentioned in the Appendix of the standard. Now in the 2009 standard, tepid water requirements have been moved into the Definitions section which clearly defines a tepid water range of 60°-100°F. It is expected that regulators will now be stepping up the enforcement of tepid water requirements, so make sure your facilities are in compliance. Read more about tepid water in the section below.

Listed below are the latest compliance changes to the standard highlighted in blue.  

·        Water temperature requirement referred to as “Tepid” 

The water temperature for the flushing fluid in an eyewash station must be tepid.  Tepid is now defined in ANSI Z 358.1 as being between 60º and 100ºF. (16º-38º C).  

• Temperature. The water has to be tepid (Appendix B-6). Temperatures exceeding 38oC have proven to be harmful and may enhance chemical interaction. Cold flushing may help reduce chemical interaction; however, prolonged exposure may effect body temperature in the case of showers. If located in areas subject to freezing, the unit must be protected from freezing. 

Q. What water temperature is required?

A. The ANSI Z38.1 Standard states the use of tepid water. No temperature degree range was stated.