I won't go into my idea of a spinning deflector to improve water distribution
(this may have already been done; i'm not sure)
At 10:18 AM 4/25/2012, you wrote:
>Thanks Todd.
>
>I was really thinking along these lines. When calc'ing coverage, density
>and such...we measure linearly right?. And thus, we measure squares of
>coverage. However, the sprinkler generally throws in a circular pattern.
>What percentage of a circle lies outside the box once it is drawn inside of
>a circle? I flunked out of Bus. Calc... Might point being, we are proving
>and being rejected for a few pounds here;gpms there; by what is proven in
>the box. Not many bucket tests going on. Do we conservatively give away
>this advantage because squares are easier to deal with mathematically?
>Also, aren't most sprinklers conservatively rated. I have seen a standard
>head throw well beyond 7'6" or 9'-0" for that matter. Oh, and this just in,
>{they never stop these days...} As the water stream hits the deflector and
>is deflected outwards, wouldn't a circular shadow be formed directly under
>each head? This would also subtract another percentile from what is
>actually "in the box" I guess that would be a negative though.
>
>This is all rhetorical and is just an exercise in learning and creative
>thinking.
> Teach your kids to read. Teach your kids to question everything they read.
>Teach them to question everything... George Carlin.
>
>On Tue, Apr 24, 2012 at 1:50 PM, Bruce Verhei <[email protected]> wrote:
>
>> I've read in the past that this fell in the not well understood effect
>> category when engineers have desired to model how sprinklers actually work.
>> This seems to be difficult. They say something that ends with but
>> sprinklers installed and maintained to standards have a remarkable record
>> of controlling fires in buildings.
>>
>> I want to buy one of the square heads. Are the threads square too?
>>
>> Bruce
>>
>> Sent from my Motorola ATRIX™ 4G on AT&T
>>
>> -----Original message-----
>> From: Thomas Watt <[email protected]>
>> To: [email protected]
>> Sent: Tue, Apr 24, 2012 13:05:01 GMT+00:00
>> Subject: Rounding off {Squaring off?}
>>
>> I had a brain-fart and came up with this question for the forum. Especially
>> the engineers. Since sprinklers, in general, throw in a circular pattern,
>> and we calc the sprinklers as squares, there is always overlap so we are by
>> default miscalculating a percentage of the density. Has anyone ever
>> calculated the safety factor effect by ignoring the arcs outside the
>> square???
>>
>> Thomas
>> A+ fitter/Foreman
>> No work in Orlando, FL area
>> Willing to relocate
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Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, CT
860.535.2080
www.fpdc.com
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