Have you looked at the latest NFPA 80A. I thought (but can not put my hands on it this second) that they changed the reference to a water curtain for exposure protection. It was pointed out that a water curtain per NFPA 13 is a single row of sprinklers at an 6 ft spacing and located only at the ceiling or top. Such an arrangement is inadequate for exposure protection of a building with multiple stories especially a tall building.
Roland On Apr 19, 2013, at 12:02 PM, MOWLE Kevin(K) - BRUCE POWER <[email protected]> wrote: > Hello fellow forumites: > > I don't know how common this type of configuration is however I am wondering > if anybody else has run into this problem. > > Last year as part of a retrofit we installed a fire water curtain system as a > barrier between the building and some large transformers. The curtains are > fed from 6" deluge valves and created a proper curtain during commissioning. > Below the curtain is a large fan intake run only during warmer temperatures. > The intake has louvers to deflect rain however they are not designed for the > quantity of water seen with the curtain. Earlier this month the deluge > curtain operated due to a fault in the detection. The water was drawn into > the fan unit and in turn overtaxed the fan drains causing other problems. I > was wondering if any one else out there has experienced an event like this? > > The resolution here will be to confirm the integrity of the fan drains and > have the operators shut the fans down while testing the deluge or > unintentional operation of the deluge curtain. > > Thanks > Kevin Mowle > Bruce Power > > Please email for photos > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
