SprinklerDesigner2
Mechanical
- Nov 30, 2006
- 1,251
I am dealing with a building designed per NFPA #13R (2002)using an extended coverage sprinkler having a maximum throw of 24'-0".
Distance from wall to wall is 23'-11".
Each room has a single window where the sill is begins 3' above the floor with the window pane recessed creating a sill depth of of 6". Total distance between wall and window pane is 24'-5".
I've never worried about simple window sills before in any application.
From Appendix.
A.6.7.1.5.3 Fire testing has indicated the need to wet walls in the area protected by residential sprinklers at a level closer to the ceiling than that accomplished by standard sprinkler distribution. Where beams, light fixtures, sloped ceilings, and other obstructions occur, additional residential sprinklers could be necessary to achieve proper response and distribution, and a greater water supply could be necessary.
Small areas created by architectural features such as planter box windows, bay windows, and similar features can be evaluated as follows:
(1) Where no additional floor area is created by the architectural feature, no additional sprinkler protection is required.
(2) Where additional floor area is created by an architectural feature, no additional sprinkler protection is required, provided all of the following conditions are met:
(a) The floor area does not exceed 18 ft2 (1.7 m2).
(b) The floor area is not greater than 2 ft (0.65 m) in depth at the deepest point of the architectural feature to the plane of the primary wall where measured along the finished floor.
(c) The floor is not greater than 9 ft (2.9 m) in length where measured along the plane of the primary wall.
Measurement from the deepest point of the architectural feature to the sprinkler should not exceed the maximum listed spacing of the sprinkler. The hydraulic design is not required to consider the area created by the architectural feature.
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I guess a window sill could be regarded as an architectural feature but I've always thought of this section to mean unusually deep architectural features one might expect in a bay window or extra deep pocket.
I've got lots and lots of water pressure; does anyone know of a quick response sprinkler with listed coverage greater then 24'?
Distance from wall to wall is 23'-11".
Each room has a single window where the sill is begins 3' above the floor with the window pane recessed creating a sill depth of of 6". Total distance between wall and window pane is 24'-5".
I've never worried about simple window sills before in any application.
From Appendix.
A.6.7.1.5.3 Fire testing has indicated the need to wet walls in the area protected by residential sprinklers at a level closer to the ceiling than that accomplished by standard sprinkler distribution. Where beams, light fixtures, sloped ceilings, and other obstructions occur, additional residential sprinklers could be necessary to achieve proper response and distribution, and a greater water supply could be necessary.
Small areas created by architectural features such as planter box windows, bay windows, and similar features can be evaluated as follows:
(1) Where no additional floor area is created by the architectural feature, no additional sprinkler protection is required.
(2) Where additional floor area is created by an architectural feature, no additional sprinkler protection is required, provided all of the following conditions are met:
(a) The floor area does not exceed 18 ft2 (1.7 m2).
(b) The floor area is not greater than 2 ft (0.65 m) in depth at the deepest point of the architectural feature to the plane of the primary wall where measured along the finished floor.
(c) The floor is not greater than 9 ft (2.9 m) in length where measured along the plane of the primary wall.
Measurement from the deepest point of the architectural feature to the sprinkler should not exceed the maximum listed spacing of the sprinkler. The hydraulic design is not required to consider the area created by the architectural feature.
=================
I guess a window sill could be regarded as an architectural feature but I've always thought of this section to mean unusually deep architectural features one might expect in a bay window or extra deep pocket.
I've got lots and lots of water pressure; does anyone know of a quick response sprinkler with listed coverage greater then 24'?