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http://www.facebook.com/photo.php?pid=3D2737505&l=3D81d770d679&id=3D5120966=
82
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If you haven't seen this picture=2C it says it all. When the vote in Balti=
more happened=2C it was overwhelming to see a count of somewhere around 150=
0 to 8 (don't know the official tally). =20
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We have a long tough road ahead of us=2C but the tide has definitely turned=
regarding the opinion of the general membership of the IRC!
=20
Thanks to Dan Gengler in Wisconsin for sending this picture along. If you =
were there=2C log on to facebook and tag yourself in the photo. =20
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Rock on=2C
Cecil Bilbo=20
Academy of Fire Sprinkler Technology
Champaign=2C IL
845-878-4200 x138=20
www.sprinkleracademy.com
> Date: Sun=2C 1 Nov 2009 20:19:16 -0500
> To: [email protected]
> From: [email protected]
> Subject: Re: sprinkler operational area concept - orthodoxy or blasphemy=
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>=20
> I have had similar situation happen occasionally (not to this=20
> dramatic degree) in warehouses where the last bay is a different=20
> dimension than the others. If we go by the strict NFPA 13 definition=20
> of sprinkler spacing=2C distance along branch lines times distance=20
> between branch lines=2C then the spacing does not fall under 130 sqft.=20
> Since spacing dictates end head pressure and is mandated by 13=2C it=20
> needs to be followed. Add two sprinklers to the System A line=20
> adjacent to the boundary and decrease the distance between them to 10=20
> ft. Now you have a maximum of 112.5 sqft throughout the space.
>=20
>=20
>=20
> At 07:58 PM 11/1/2009=2C you wrote:
>>Skip reading this post if you prefer to avoid wasting grey matter.
>>Have paper and pencil handy if you do.
>>
>>Imagine a room 30 feet by 60 feet where the 30 foot dimension is left
>>and right and the 60 foot dimension is up and down. This room requires
>>OH spacing. We will examine three different sprinkler layouts. The
>>branch lines run in the 60 foot direction in all the layouts. The
>>hydraulics are not to be an issue in this exercise.
>>
>>The first layout=2C A=2C uses four branch lines spaced 7.5 feet apart=2C
>>starting at 3.75 feet from the long wall=2C with sprinklers spaced on 15
>>foot centers=2C starting at 7.5 feet from the short wall. System A uses
>>16 sprinklers. The sprinkler operational area=2C 112.5 square feet=2C is
>>less than 130 square feet per sprinkler. The miraculous hydraulics in
>>the imaginary system A delivers the correct water density.
>>
>>The second layout=2C B=2C uses two branch lines spaced 15 feet apart=2C
>>starting at 7.5 feet from the long wall=2C with sprinklers spaced on 7.5
>>foot centers=2C starting at 3.75 feet from the short wall. System B uses
>>16 sprinklers. The sprinkler operational area=2C 112.5 square feet=2C is
>>less than 130 square feet per sprinkler. The miraculous hydraulics in
>>the imaginary system B delivers the correct water density.
>>
>>Both system A and system B appear to be identical with respect to
>>sprinkler design density. Each uses the same number of sprinklers for
>>the same total area and each sprinkler in both systems operates the
>>same operational area of 112.5 square feet. Both system A and system B
>>are also bilaterally symmetrical. You can split each into two equal
>>sized sprinkler systems right down the middle in the up and down
>>direction. You would have a 15 foot wide by 60 foot long=2C two branch
>>line system A Left and and an identical system A Right. You would
>>have a 15 foot wide by 60 foot long=2C one branch line system B Left and
>>an identical system B Right. All these Left and Right systems also
>>appear to be identical with respect to sprinkler density.
>>
>>The third layout C=2C which as stated before is for the same 30 foot by
>>60 foot room=2C is comprised of the 15 foot wide by 60 foot long=2C two
>>branch line system A Left abutted to the 15 foot wide by 60 foot long=2C
>>one branch line system B Right. Each of these Left/Right pieces is one
>>half of two equal design density sprinkler systems that covered the
>>same area.
>>
>>Logically system C appears to be equal with regard to sprinkler design
>>density to system A and system B. (Remember that hydraulics are not to
>>be an issue in this exercise.) The logic required to consider this
>>equality involves considering the operational area for each individual
>>sprinkler=2C which we happen to be accustomed to doing for sprinklers
>>occurring at boundaries=2C but which is considered by some as blasphemy
>>when applied in this exercise.
>>
>>The "blasphemy" for system C occurs at the boundary between the two
>>equal sprinkler design density systems A Left and the system B Right
>>pieces. Here the distance between the branch lines is 11.25 feet.
>>Therefore according to the rules the spacing between OH sprinklers
>>cannot exceed 11.55 feet and thus the maximum distance the end
>>sprinklers can be from the wall is 5.77 feet. That is fine for the
>>system B Right where the end sprinkler is 3.75 feet from the wall but
>>it is not fine for the system A Left. Its sprinklers are 7.5 feet from
>>the wall.
>>
>>What made system C work logically as the addition of to equal systems
>>is that the dividing boundary between the system A Left and system B
>>Right occurs at 3.75 feet from the last system A Left branch line
>>which is 7.5 feet from the first system B Right branch line. This line
>>is at the blasphemous sprinkler operational area extents for the 7.5 x
>>15 spaced sprinklers and the 15 x 7.5 spaced sprinklers=2C not at
>>halfway between the 11.25 spaced branch lines.
>>
>>This is enough wasted matter.
>>
>>Allan Seidel
>>St. Louis=2C MO
>>
>>
>>
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>>
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>>
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rg
>>(Put the word unsubscribe in the subject field)
>=20
> Todd G. Williams=2C PE
> Fire Protection Design/Consulting
> Stonington=2C Connecticut
> www.fpdc.com
> 860.535.2080=20
> _______________________________________________
> Sprinklerforum mailing list
> [email protected]
> http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
>=20
> For Technical Assistance=2C send an email to: [email protected]
>=20
> To Unsubscribe=2C send an email to:[email protected]=
rg
> (Put the word unsubscribe in the subject field)
> =
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