Obstructions to sprinkler discharge

[trashcanman]

Given: large room with existing heads up near roof (no drop ceiling), lots of piping and ducts below, + lots and lots of vertical boards hanging (acoustical to absorb noise of manufacturing). These boards are about 24" x 18" and are several feet below structure. The area is Ordinary Hazard, Group II. NFPA 13 does not appear to cover such obstructions as only light hazard is mentioned. I think new heads must be added at or below said boards, ducts, piping, raceways, etc. The problem is that code says heads must be at high points of the structure. Any suggestions are appreciated. Thanks.

 

[cdafd]

Not near the boo till Monday

A few things the hospital room curtain provision

And also 50 per cent opening and a certain distance down from the heads

Also in the book is a short vertical coming up from the floor rule


I have seen what you have just not near the book

 

[TravisMack]

How far below? I don't have the exact reference at this moment, but if you are looking to apply something like the 3x rule, there is a section in NFPA 13 that says structural members only shall be considered in light and ordinary hazard areas when applying the 3x rule. The appendix goes on to clarify why this statement is made. That may be the reason the initial installation left them out.

Travis Mack
MFP Design, LLC

http://www.mfpdesign.com

"Follow" us at

https://www.facebook.com/pages/MFP-Design-LLC/92218417692

 

[cdafd]

Plus as in op

Would they even activate

 

[cdafd]

Something like this???

https://ixquick-proxy.com/do/spg/sh...3904878&pid=15.1&H=94&W=160&rl=NONE&u=http://

http://www.wiusa.com/wallfinishes/a...ww.wiusa.com/wallfinishes/images/baffesEo.jpg

Believe it falls under 50 per cent opening and a required distance down from
The sprinkler

 

[cdafd]

Look at the open ceiling grid provision section

So big of opening and do far down from the head

 

[cdafd]

Check this



Open grid ceilings do not necessarily have to be listed, although that option is open to manufacturers. NFPA 13 contains specific geometric criteria by which open grids can be placed below sprinklers. Openings must be at least 1⁄4-inch (6.4 millimeters) wide in the least dimension, and at least 70 percent open. The depth of the ceiling panels is not permitted to exceed the least dimension of the grid
openings. Minimum clearance between sprinkler deflectors and the ceiling is based on hazard classification and sprinkler spacing as follows:
For light hazard, minimum clearance is 18 inches (457 millimeters) for spacing up to 10 feet x 10 feet (3 meters x 3 meters); 24 inches (610 millimeters) for spacing up to 10 feet x 12 feet (3 meters x 3.7 meters); and 36 inches (914 millimeters) for greater sprinkler spacing. These criteria apply to both spray and old-style sprinklers. Ordinary hazard criteria apply only to the use of spray sprinklers. Minimum clearance is 24 inches (610 millimeters) for spacing up to 10 feet x 10 feet (3 meters x 3 meters) and 36 inches (914 millimeters) for greater sprinkler spacing.
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