What jumps out to me is the spray foam insulation. I’m not sure that the
requirements for a typical paint spray booth would be applicable. Two very
different products. I would look for any research or testing done on that
specific product. Also the MSDS for it as a liquid and a cured product would be
helpful.
>
> On Oct 12, 2021 at 5:21 PM, <P.E. via Sprinklerforum David L. Miller
> (mailto:[email protected])> wrote:
>
>
>
> Does anyone have advice as to how one would calculate a "spray booth" for
> spraying foam insulation that is approximately 90' tall X 25' diameter with
> five levels of working platforms? Typically, when I have done paint booths
> for vehicles (even as large as fire trucks) I have calculated the system as a
> deluge system because of concerns regarding flames in a vapor cloud opening
> heads throughout the booth. In this case, there will likely be 8 - 10
> sprinklers at each level of the working platforms plus 20 sprinklers at the
> roof (due to structural obstructions). This totals 60 - 70 sprinklers flowing
> at Extra Hazard Group 2 densities if the system is treated as a deluge system
> for hydraulic calculation purposes. NFPA 33:9.6.3 (also NFPA 13:26.4.1.4)
> "The water supply shall be sufficient to supply all sprinklers likely to open
> in any one fire incident without depleting the available water for use in
> hose streams." I am wondering about the likelihood of sprinklers at the roof
> operating simultaneously with multiple levels of sprinklers below the
> operating platforms. Or, as the Annex to NFPA 33:9.6.3 puts it, what is a
> "credible fire scenario" for a spray booth such as this? Is it a reasonable
> assumption that sprinklers installed 15' AFF will operate while the flame
> front continues to open sprinklers at different elevations up to and
> including the roof level at approximately 90' AFF? Conversely, is it
> reasonable to make the assumption that a fire will not open all of the
> sprinklers? If I had an unlimited water supply I would simply calculate the
> system as a deluge system. If I had an unlimited budget, I would make each
> level a separate deluge system with flame detectors at each level.
> Unfortunately, we do not operate with unlimited water supplies and unlimited
> budgets. Any advice would be greatly appreciated. David L. Miller, P.E.
> Engineered Fire Protection, LLC 11920 Richcroft Avenue
> (x-apple-data-detectors://2/2) Baton Rouge, Louisiana 70814
> (x-apple-data-detectors://3/0) 225-273-5040 (tel:225-273-5040)
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