S(pr)ay
A Little, Mist A Lot
In
early June, I attended my third National Fire Protection Association World
Safety Conference and Exposition. This four-day event, held most recently in
Las Vegas, has a special significance to me.
Not only does it allow me to find out the latest in all aspects of fire
protection [technology, codes, product innovations, etc.], it also serves as a
reference point in my time as editor ofPM Engineer. You
see, it was at the 2006 NFPA event that I began my tenure asPMEeditor. And so this year I marked my second anniversary while walking the trade
show floor and learning all about the latest and greatest trends in this
important industry.
Like I did the previous two years, I visited countless manufacturer booths and
got up to snuff on the newest products that engineers will soon be introduced
to as they make their specifying decisions. In addition, I sat in on several
seminars to find out about the key changes to NFPA standards 13, 25 and 72, and
gain some insight into the latest Research Foundation test projects, such as
the impact of ceiling fans and (separately) product deficiencies on sprinkler
performance.
But unlike my first two shows, this year I saw an overwhelming presence of
water mist systems, and they all drew my interest. Overall, I visited about 10
exhibitors to discuss their respective systems, but my favorite was one that
was demonstrated every hour.
Once this particular system was activated and spraying full-force, attendees
were encouraged to walk below it to feel the fine water droplets for themselves
- and to see how quickly they became dry after walking away from the spray [see
photo]. This experience fascinated me, so I inquired why this happened.
I learned that these high-pressure systems produce thousands of droplets of
water from the same unit of water required to produce a single droplet from a
conventional sprinkler head. Then I was told that this large number of small
water droplets has a vaporization rate of about 400:1 compared with a
conventional sprinkler head.
Equally important, I became aware ofNFPA 750, Standard on Water Mist
Fire Protection Systems, and thumbed through it for the first time.
Water mist systems have been around since the early ’90s, but their acceptance
is slowly growing - especially for use in oil platforms and manufacturing
environments. Not surprisingly, NFPA 750 has also expanded, with the current
edition (2006) being nearly twice as long as that published 10 years
before.
Armed with this basic awareness of water mist systems, I sought information
from fire-protection engineers (who stopped by thePMEbooth) about their first-hand experiences with the systems. Most engineers had
limited experience, but all expressed interest in reading more about them in a
future issue ofPME.
I wholeheartedly agree, so I welcome you to tell me about your experiences with
water-mist systems as we research the topic for an upcoming
article.
Remember: Your feedback (and mine) is powerful stuff. Like a single drop in a
water-mist system, it can either get dispensed to thousands of fellow readers
in the form of helpful and useful information - or it can evaporate quickly and
be sorely missed.