If I'm understanding your description and question properly you are covering about 116-117 sqft of floor area if one considers the 1'8" rise at the tip of the tooth an obstruction, which I would, and your "throw distance" along the slope is at 0-360 degrees=7.5'/90 degrees=7.0'/180 degrees=7.5 degrees/270 degrees=1.0'. That puts you within coverage rules for OH, and throw range rules for SS sprinklers.
On Thu, Nov 30, 2017 at 8:33 AM, Michael Hill <[email protected]> wrote: > I am working on a firing range that is going to have a saw-tooth type > ceiling installed. I have a question about determining maximum protection > area per sprinkler. > > > > The vertical portion is 1’-8” tall with the distance from the high point > to the low point being 8’-0”, measured along the slope. Sprinklers need to > be spaced close to the vertical portion of the ceiling, to protect them > from stray projectiles. The sprinkler will end up being about 7’-0” from > the low point of the ceiling, measured along the slope. The sprinklers are > about 8’-0” apart, but with a 1’-8” vertical portion of the ceiling between > them. Sprinklers are spaced 15’-0” apart along the branchline. See attached > sketch (if it came through). > > > > Would the spacing be 15’ x 8’ or would it be 15’ x 14’? > > > > I feel it should be 15’ x 14’ as any individual sprinkler needs to cover > 7’-0” in one direction, measured along the slope. I feel the vertical > portion of the ceiling is an obstruction and can almost been interpreted as > a wall that extends to the floor. I also thought I needed to increase my > design area for sloped ceiling for this situation, but have since been > shown the commentary in the handbook that explains why it is not required > for saw-toothed ceilings. Maybe I am wrong about the spacing as well. > > > > > > > > > > Mike Hill > > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler. > org > > -- Ron Greenman [email protected] 253.576.9700 The Universe is monstrously indifferent to the presence of man. -Werner Herzog, screenwriter, film director, author, actor and opera director (1942-)
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