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Specific Application Sprinklers John Desrosier PE

Fire Protection Engineering: Specific Application Sprinklers

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Page 1: Fire Protection Engineering: Specific Application Sprinklers

Specific Application Sprinklers

John Desrosier PE

Page 2: Fire Protection Engineering: Specific Application Sprinklers

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

Page 3: Fire Protection Engineering: Specific Application Sprinklers

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.

Page 4: Fire Protection Engineering: Specific Application Sprinklers

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

Page 5: Fire Protection Engineering: Specific Application Sprinklers

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

Page 6: Fire Protection Engineering: Specific Application Sprinklers

• 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

Page 7: Fire Protection Engineering: Specific Application Sprinklers

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.

Page 8: Fire Protection Engineering: Specific Application Sprinklers

UL Std. Sprinkler Test #2

Page 9: Fire Protection Engineering: Specific Application Sprinklers

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.

Page 10: Fire Protection Engineering: Specific Application Sprinklers

UL Std. Sprinkler Test #3

Page 11: Fire Protection Engineering: Specific Application Sprinklers

• 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

Page 12: Fire Protection Engineering: Specific Application Sprinklers

UL Std. Sprinkler Test #4 - Layout

Peak 5’

-0”

5’-0

Page 13: Fire Protection Engineering: Specific Application Sprinklers

UL Std. Sprinkler Test #4 - Set-up

Page 14: Fire Protection Engineering: Specific Application Sprinklers

Test No. 4

9:13 s. after Ignition 14:08 s. after Ignition

Page 15: Fire Protection Engineering: Specific Application Sprinklers

Plan View of Roof Damage

Page 16: Fire Protection Engineering: Specific Application Sprinklers

Types of Attic Sprinklers

Page 17: Fire Protection Engineering: Specific Application 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

Page 18: Fire Protection Engineering: Specific Application Sprinklers

Back to Back (BB) Spray

Page 19: Fire Protection Engineering: Specific Application Sprinklers

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

Page 20: Fire Protection Engineering: Specific Application Sprinklers

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

Page 21: Fire Protection Engineering: Specific Application Sprinklers

Hip Spray

Page 22: Fire Protection Engineering: Specific Application Sprinklers

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

Page 23: Fire Protection Engineering: Specific Application Sprinklers

AP Spray (& SSU)