For whatever it is worth, and getting further off-topic, my understanding from being a volunteer firefighter is that the fog nozzle isn't designed to protect whatever is being sprayed, but to protect the firefighters and their equipment by preventing a solid stream of water (regular nozzle) acting as a conductor arcing transmission line power to the truck - by dispersing the stream into many droplets (with the fog nozzle), electrical transfer has to also arc across many air gaps. Effectiveness isn't an issue either - a straight stream is generally more effective at getting larger amounts of water where you want it and is the default nozzle. You switch to fog nozzles when you are at risk of hitting electrical sources with the stream (though they (fog nozzles) are sometimes also used as a preventative stream to keep the next door building cool to prevent inter-structural spread of the fire).
> Message: 2 > Date: Thu, 21 Apr 2016 23:36:03 +0000 > From: "Lux, Jim (337C)" <[email protected]> > To: "[email protected]" <[email protected]>, Greg Lindahl > <[email protected]> > Cc: Beowulf List <[email protected]> > Subject: Re: [Beowulf] urgent: cost of fire suppression? > Message-ID: <d33eb04b.6182a%[email protected]> > Content-Type: text/plain; charset="utf-8" > > Interesting stuff > > Kind of like the fog nozzle used by firefighters which is more effective > than the traditional ?stream of water?. > > However, they do say "Nearly zero wetting of protected areas? - nearly > zero isn?t zero, but if combined with an emergency power off, then it could > work. And anyway, the real goal is to get people out of there before > they?re burned or inhale toxic smoke. > > I?m kind of surprised they don?t have any video of a real fire being > suppressed: that animation is from 2009, and if they?ve been in business > selling these things for 5-6 years, presumably they?ve had at least one > success story? They?ve got that white paper showing that the computer > keeps on running while they discharge, but does it really put out fires? > > > > Jim > > > From: Beowulf <[email protected]<mailto: > [email protected]>> on behalf of Stu Midgley <[email protected] > <mailto:[email protected]>> > Reply-To: "[email protected]<mailto:[email protected]>" <[email protected] > <mailto:[email protected]>> > Date: Thursday, April 21, 2016 at 12:54 PM > To: Greg Lindahl <[email protected]<mailto:[email protected]>> > Cc: "[email protected]<mailto:[email protected]>" <[email protected] > <mailto:[email protected]>> > Subject: Re: [Beowulf] urgent: cost of fire suppression? > > Yes, live in Australia, but in Houston at the moment (installing a new > system). > > I don't disagree that they aren't good and indeed the removal from the > market has led to lots of other technologies. As indicated earlier, our > next room will use this > > > http://www.victaulic.com/en/businesses-solutions/solutions/hybrid-fire-suppression-technology/ > > which looks pretty cool and doesn't need a pressure rated room. Which, > makes it much easier to get fibre/cables out of the room. > > > On Thu, Apr 21, 2016 at 1:39 PM, Greg Lindahl <[email protected]<mailto: > [email protected]>> wrote: > You live in Australia, right? Halon systems leak all the time, it's > not only discharge due to fires that's an issue. > > The oldest machine room I've ever "owned" had a grandfathered, > ozone-destroying AC system that leaked... a lot. > > On Thu, Apr 21, 2016 at 08:54:25AM -0500, Stu Midgley wrote: > > and, you know, given the number of times fire supression systems go off > in > > a computer room, and the nastyness that is released when a computer room > > does go up... I'd say far outweigh the environmental issues of a halon > > system. > > > > On Thu, Apr 21, 2016 at 7:02 AM, Gavin W. Burris <[email protected] > <mailto:[email protected]>> > > wrote: > > > > > Simulation supplants lots of real-world material testing, not to > mention > > > the efficiencies eked out by CFD in various applications. So, an > argument > > > could be made that HPC is environmentally friendly. Although, work > does > > > expand to fill all (cpu)* time. ?\_(?)_/? > > > > > > On Wed 04/20/16 07:21PM EDT, Stu Midgley wrote: > > > > in stark contrast to the environmentally friendly-ness of super > computers > > > > and clusters... > > > > > > > > On Wed, Apr 20, 2016 at 6:04 PM, Jonathan Aquilina < > > > [email protected]<mailto:[email protected]>> > > > > wrote: > > > > > > > > > Halon is no longer used due to its harmful effects on the > environment. > > > > > > > > > > > > > > > > > > > > > > > > > On 2016-04-19 19:32, Per Jessen wrote: > > > > > > > > > > William Johnson wrote: > > > > > > > > > > Hello, > > > > > > > > > > I can't speak to the cost in dollars, but you my want to define > your > > > > > goal in fire suppression. > > > > > Whether you are trying to just save the building or also have hopes > > > > > for data recovery might determine the type of system you employ, > be it > > > > > plain water sprinklers or some kind of chemical foam. > > > > > > > > > > > > > > > I thought halon gas was the usual choice for datacentres, has that > gone > > > > > out of fashion? > > > > > > > > > > > > > > > _______________________________________________ > > > > > Beowulf mailing list, [email protected]<mailto: > [email protected]> sponsored by Penguin > > > Computing > > > > > To change your subscription (digest mode or unsubscribe) visit > > > > > http://www.beowulf.org/mailman/listinfo/beowulf > > > > > > > > > > > > > > > > > > > > > > -- > > > > Dr Stuart Midgley > > > > [email protected]<mailto:[email protected]> > > > > > > > _______________________________________________ > > > > Beowulf mailing list, [email protected]<mailto:[email protected]> > sponsored by Penguin Computing > > > > To change your subscription (digest mode or unsubscribe) visit > > > http://www.beowulf.org/mailman/listinfo/beowulf > > > > > > > > > -- > > > Gavin W. Burris > > > Senior Project Leader for Research Computing > > > The Wharton School > > > University of Pennsylvania > > > Search our documentation: http://research-it.wharton.upenn.edu/about/ > > > Subscribe to the Newsletter: http://whr.tn/ResearchNewsletterSubscribe > > > > > > > > > > > -- > > Dr Stuart Midgley > > [email protected]<mailto:[email protected]> > > > _______________________________________________ > > Beowulf mailing list, [email protected]<mailto:[email protected]> > sponsored by Penguin Computing > > To change your subscription (digest mode or unsubscribe) visit > http://www.beowulf.org/mailman/listinfo/beowulf > > _______________________________________________ > Beowulf mailing list, [email protected]<mailto:[email protected]> > sponsored by Penguin Computing > To change your subscription (digest mode or unsubscribe) visit > http://www.beowulf.org/mailman/listinfo/beowulf > > > > -- > Dr Stuart Midgley > [email protected]<mailto:[email protected]> > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://www.beowulf.org/pipermail/beowulf/attachments/20160421/a9f222f6/attachment.html > > > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > Beowulf mailing list > [email protected] > http://www.beowulf.org/mailman/listinfo/beowulf > > > ------------------------------ > > End of Beowulf Digest, Vol 146, Issue 18 > **************************************** >
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