[Beowulf] urgent: cost of fire suppression?

Fri Apr 22 09:55:46 PDT 2016

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)" <james.p.lux at jpl.nasa.gov>
> To: "sdm900 at gmail.com" <sdm900 at gmail.com>, Greg Lindahl
>         <lindahl at pbm.com>
> Cc: Beowulf List <beowulf at beowulf.org>
> Subject: Re: [Beowulf] urgent: cost of fire suppression?
> Message-ID: <D33EB04B.6182A%james.p.lux at jpl.nasa.gov>
> 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 <beowulf-bounces at beowulf.org<mailto:
> beowulf-bounces at beowulf.org>> on behalf of Stu Midgley <sdm900 at gmail.com
> <mailto:sdm900 at gmail.com>>
> Reply-To: "sdm900 at gmail.com<mailto:sdm900 at gmail.com>" <sdm900 at gmail.com
> <mailto:sdm900 at gmail.com>>
> Date: Thursday, April 21, 2016 at 12:54 PM
> To: Greg Lindahl <lindahl at pbm.com<mailto:lindahl at pbm.com>>
> Cc: "beowulf at beowulf.org<mailto:beowulf at beowulf.org>" <beowulf at beowulf.org
> <mailto:beowulf at beowulf.org>>
> 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 <lindahl at pbm.com<mailto:
> lindahl at pbm.com>> 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 <bug at wharton.upenn.edu
> <mailto:bug at wharton.upenn.edu>>
> > 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 <
> > > jaquilina at eagleeyet.net<mailto:jaquilina at eagleeyet.net>>
> > > > 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?
> > > > >
> > > > >
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> > > >
> > > > --
> > > > Dr Stuart Midgley
> > > > sdm900 at sdm900.com<mailto:sdm900 at sdm900.com>
> > >
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> > > The Wharton School
> > > University of Pennsylvania
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>
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> Dr Stuart Midgley
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