shadowed floor area NFPA 13R 2

[dalemontalban]

In NFPA 13R 2010 section 6.2.3.5.4 mentions of shadowed floor area. How do you figure
a shadowed floor area? I think the answer would depend on 1. size of obstruction
2. distance of obstruction from a wall or sprinkler coverage 2. distance of obstruction from sprinkler.
Am I right?

Thanks.

Dale

 

[Jondoeiowa]

Dale,

From your description the way to figure the area is a simple matter in most cases. I've attached a drawing to give an example, each shaded area is a shadow created from spray pattern in the bathroom. To calculate their area is a simple matter of figuring the area of a triangle (

http://www.mathopenref.com/trianglearea.html).

I hope this answered your question.

Jon

 

[acb324]

If you look in the annex material,A.6.2.3.5.4 states: For purposes of simplified calculations, assume in this theoretical case that the water discharging from a sprinkler travels in a straight line only.

So what Jon says is accurate and it should be a pretty simple calculation, usually a triangle or the sum of some simple geometric shapes.

 

[TravisMack]

If you are using any CAD program, just use the area function of the CAD program to determine the value.

I just draw a line from the sprinkler to the edge of the obstruction and project it to the wall. It works pretty easy. I hope the description makes sense.

Travis Mack
MFP Design, LLC

http://www.mfpdesign.com

 

[2civic3]

Sorry for hacking your post. Where in NFPA 13 saying shadowed area? I've attached a drawing of my situation. Thanks!

 

[cdafd]

Civic

Are you doing 13 or 13r?????

 

[cdafd]

http://www.youtube.com/watch?v=z8q8ajQ27WQ

march 2012