We're working on a building that is an old 2-story storage steel building that was fitted with an ill-installed K14 ESFR system. It neglected roof construction, obstructions, and distance from the roof some 20-years ago.
A new owner has removed floor separations, understands that the sprinkler installation must be renewed, but has based the renewal on the possibility of continuing the use of ESFR here.
Due to the roof construction in two large (open but not connected) building sections with about 500 sprinklers each, there are some problems for 5-10% of the sprinklers in these areas. Half of them will have problems with obstructions or distance from the roof and will be "doubled-up" less than 2-ft from a dividing baffle.
For the other half there may be a solution based on lowering these (shown below); light gray are trusses with a slight riser at the upper belt. Green is a part of the horizontal wind bracing crossing H-beams. Red are sprinkler pipes.
The lowered ESFR K25 will have the mid-point of the glass bulb within the maximum allowed distance from the roof (that have a maximum height of 34-ft from the floor).
Is this an acceptable solution for a small number of sprinklers (one here, one there) in a larger section?
Is there an issue with some of the sprinklers being at the lower limit, while others are higher in elevation?
We can't get rid of the wind bracing, so will the water demand still be based on 12 activated sprinklers even if they're closer together?
Thanks in advance.
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