porte a cache help

[cdafd]

I know this is not a design forum

BUT

looking for any advice to sprinkler a 32 long by 22 wide porte cache and yes it has to be sprinkled.

Trying to find an alternative besides three lines of pendants???

any help??

 

[TravisMack]

2 lines of ex cov sprinklers At least it is not 3 lines

Travis Mack
MFP Design, LLC

 

[cdafd]

TravisMack

I was wondering about that

can you tell me is there much difference on hydraulic requirements??

 

[cdafd]

my bad this is a """"vaulted""" porte a cache

 

[TravisMack]

What is the slope of the vault?

Travis Mack
MFP Design, LLC

 

[firepe]

How about limited combustible construction, ie. metal studs or fire retardant studs and plywood, meeting the definition of "limited combustible" in NFPA 13.

I assume you mean "porte couchere", I am not sure what a "porte a cache" is.

 

[cdafd]

firepe

yea one of them to

one problem is it is already built and trying to retro fit it made out of wood

 

[cdafd]

TravisMack

not really sure on slope maybe 4/12 at most???

 

[TravisMack]

Without digging through data sheets, and going off a fading memory, I believe that ex cov is only for flat (<2:12) ceilings. As such, ex cov is not in order. It seems like you may be stuck with std cov sprinklers. As far as the concealed space, you may be able to get it with a single row of Tyco BB1 sprinklers.

If it is 22' wide, I am assuming the trusses span the 22' dimension. Therefore, you would only need 2 branch lines at 11' apart (66" from each end). You would then put 3 sprinklers on each branch line for the 32' dimension. So, you only have 2 branch lines. If you can hit the concealed space with the BB1 sprinklers, you have cut it down to a total of 3 lines for everything. Again, verify before taking any of this to mean anything.

Assuming that this is subject to freezing, you should be small enough to go with a small anti-freeze system vs dry system. Most of the contractors in the areas I deal with prefer to have a small area like this as antifreeze instead of a dry system. (based on a previous thread, if the AF piping is >40 gal, make sure to do calculations using Darcy method instead of Hazen)

I hope this makes sense.



Travis Mack
MFP Design, LLC