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Specific Application Sprinklers
John Desrosier PE
John Desrosier PE• Finished Undergraduate Degree 2009• Interned at RJA (Walnut Creek, CA)• Finished Masters 2010• Worked for small special hazard contractor
2010 • Started in Tyco Technical Services 2011• Transferred to Innovation and New Ventures
2013• Transferred back to Technical services 2014• Manager of Technical Services 2016- Present
What is meant by “Specific Application”
• A method of developing specific design and protection criteria for fire hazards not covered by current Standards.
OR• A method of developing “improved” specific
design and protection criteria for hazards currently covered by Standards, but may be found to be insufficient by today’s needs.
Special Sprinklers3.6.4.9 Special SprinklerA sprinkler that has been tested and listed as prescribed in 8.4.8
8.4.8 Special Sprinklers.
8.4.8.1* Special sprinklers that are intended for the protection of specific hazards or construction features shall be permitted where such devices have been evaluated and listed for performance under the following conditions:
(1) Fire tests related to the intended hazard(2) Distribution of the spray pattern with respect to wetting of floors and walls(3) Distribution of the spray pattern with respect to obstructions(4) Evaluation of the thermal sensitivity of the sprinkler(5) Performance under horizontal or sloped ceilings(6) Area of design(7) Allowable clearance to ceilings
How does a “Specific Application” come about?
• A need is identified by:– Manufacturer – Consortium (e.g. Retail Groups; Building
Manufacturers; Tire Manufacturers; etc)– Insurance Underwriters– Private Sector
• Questions were raised as to the level of protection provided by quick response standard spray sprinklers in sloped ceiling combustible construction.
• UL ran a series of six full scale fire tests investigating this effectiveness.
Sprinkler Protection of Sloped Combustible Concealed Spaces
Test No. 2 (7 psi)
Test No.Number of Sprinklers Operated
Test Duration min:sec
Sprinkler Operation, I.D.
No. – Time min:sec
Approximate Consumed
Area of Roof Deck
Fire Involvement Area
1 – 1:332 – 1:38
Damage Assessment (Approximate Areas)
2 2 20:00 47 sq. ft. 60 sq. ft.
UL Std. Sprinkler Test #2
Test No. 3 (20 psi)
Test No.Number of Sprinklers Operated
Test Duration min:sec
Sprinkler Operation, I.D.
No. – Time min:sec
Approximate Consumed Area of Roof
Deck
Fire Involvement Area
1 – 0:342 – 0:36
Damage Assessment (Approximate Areas)
6 sq. ft.3 2 20:00 2 sq. ft.
UL Std. Sprinkler Test #3
• 4 sprinklers were installed 10” below the roof deck.– 2 at the peak spaced 10 ft. apart & 2 sprinklers at 10’
apart installed 12’ down the slope.• A plastic ridge vent was installed at the peak with a 2”
gap between the plywood deck edges.• The ignition source placed near the eave 30” from the
bottom edge of the truss between 2 sprinklers.• Sprinklers water discharge pressure: 20 psi.
UL Std. Sprinkler Test #4
UL Std. Sprinkler Test #4 - Layout
Peak 5’
-0”
5’-0
”
UL Std. Sprinkler Test #4 - Set-up
Test No. 4
9:13 s. after Ignition 14:08 s. after Ignition
Plan View of Roof Damage
Types of Attic Sprinklers
Types of Attic SprinklersBack to Back Dual Directional
• Light Hazard Construction• 4.2K, 5.6K, and 8.0K• Roof Pitches of 3:12 up to 12:12 • Maximum Distance Between Sprinklers = 6 feet• Minimum Distance Between Sprinklers = 4
Back to Back (BB) Spray
Types of Attic SprinklersSingle Directional
• Light Hazard Construction• 5.6K• Roof Pitches of 4:12 up to 12:12• Maximum Distance Between Sprinklers = 6 feet• Minimum Distance Between Sprinklers = 4
Types of Attic SprinklersHIP Sprinkler
• Light Hazard Construction• 5.6K• Roof Pitches of 4:12 up to 12:12• Maximum Distance Between Sprinklers = 6 feet• Minimum Distance Between Sprinklers = 3
Hip Spray
Types of Attic SprinklersAttic Plus Sprinkler
• Light Hazard Construction• 4.2K, 5.6K• Roof Pitches of 3:12 up to 12:12• Maximum Distance Between Sprinklers = 10 feet perpendicular to
the slope and 12 feet parallel to the slope (No 20 psi penalty >8’)• Minimum Distance Between Sprinklers = 7
AP Spray (& SSU)