Sprinkler Density for Evidence Storage?

10/30/2018

A project that has evidence storage will have a new fire sprinkler system. The storage is anticipated to be solid back-to-back shelves no more than about 8 feet in height, but will hold crime evidence which could and will likely include firearms. What sprinkler design density is required for this area?

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2 Comments

JAMES

10/30/2018 10:53:41 am

NFPA 13 lists cartoned ammunition, small arms and shotguns as Class IV commodities in annex material (NFPA 13-2016 Table A.5.6.3 and A.5.6.3.4).

If the evidence is to be stored in closed cardboard boxes then the storage rules would apply for Class IV storage up to 8 feet in height.

Protection of Class IV Commodities in Back-to-Back Shelves ->

Chapter 14 ->

14.2 Control Mode Density/Area Sprinkler Protection Criteria for Back to Back Shelf Storage of Class I Through IV Commodities ->

14.2.3 For storage up to 12 feet in height ->

14.2.3.1 Protection criteria is same as Misc. Storage from Chapter 13 ->

Chapter 13 ->

13.2 Design Basis ->

13.2.1 The protection criteria shall be selected form Table 13.2.1 ->

Table 13.2.1 has Ordinary Hazard Group II (0.20/1,500 sqft) for Class IV, back-to-back shelf storage less than 10 feet in height.

WES

10/30/2018 11:15:25 am

If it's any help, UFC 3-600-01 lists armories as Ordinary Hazard (Appendix B-1.2, latest 2016 edition) where storage doesn't exceed 12 feet. UFC uses Ordinary Hazard as 0.20 gpm / 2,500 sqft for wet systems with ceiling heights up to 30 feet (Table 9-3).

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Sprinkler Density for Evidence Storage?

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