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WEEKLY TAKEAWAYS AS A FIRE PROTECTION ENGINEER

The Benefits of Residential-Style Fire Sprinklers

12/12/2018

 
Residential-style sprinklers are specifically designed & tested for their response and ability to "enhance survivability" in the room of fire origin. [NFPA 13 2002-07 3.6.2.10, 2010-13 3.6.4.8, 2016 3.6.4.9]

What makes them so attractive to use in residential occupancies?

Specifically Designed Spray Pattern

First, their spray pattern is specifically suited to residential hazards. Unlike light hazard office spaces, dining areas of restaurants, meeting rooms or lobbies, residential rooms regularly contain much of the fire hazard along the perimeter of the room. This hazard often presents itself as bookshelves, cabinetry, curtains, furniture, and an assortment of other potential fuel sources.

Unlike standard-spray fire sprinklers, residential-style sprinklers throw more water to where it's needed-along and up the edges of a room.
​
Residential Fire Sprinkler
Residential-style sprinklers are specifically designed to throw along the outer boundaries of rooms, which better aligns with locations of typical residential hazards. Sprinkler throw data above is of the Victaulic V2738 residential sprinkler.
Fast Response

Residential-style sprinklers are also fast to respond, with the intent to fight the fire earlier in its incipient stages. 

While light hazard areas are already required to use one of several specific sprinkler responses, including the option for quick-response sprinklers (NFPA 13 2002-16 8.3.3.1), residential-style sprinklers are still considered 'fast-response'.

The term Fast-Response is defined as a sprinkler with an RTI (Response Time Index) of 50 √m-s or less. It incorporates three specific styles of sprinklers - "Residential Sprinklers", "Quick Response Sprinklers" (including standard and extended coverage), and "Early Suppression Fast Response (ESFR)." Each of these sprinklers qualify as Fast Response, but they are not interchangeable. [Viking Technical Article by Scott Martorano, July 2006]

Hydraulic Benefits

Based on the ability to better fight a residential fire, the use of residential style sprinklers has a hydraulic kickback that dramatically helps the hydraulic calculations for a residential area.

As residential sprinklers are not quick response sprinklers, the remote area reduction for the use of quick-response sprinklers does not apply.

However, NFPA 13 and NFPA 13R only require that the most hydraulically demanding four adjacent sprinklers be calculated, while NFPA 13D only requires the most hydraulically demanding two adjacent sprinklers be calculated. [NFPA 13 2002 11.2.3.5.1, 2007-16 11.3.1.1, NFPA 13R 2002 6.7.1.2, 2007 6.8.1.2, 2010-19 7.1.1.3, NFPA 13D 2002-10 8.1.2, 2013-19 10.2]

Additionally, NFPA 13R and NFPA 13D permit the design density to be as low as 0.05 gpm/sqft or the listed density of the sprinkler. [NFPA 13R 2002 6.7.1.1.2.2, 2007 6.8.1.1.1.2, 2010-19 7.1.1, NFPA 13D 2002-10 8.1.1, 2013-19 10.1.1]
GET THE MEYERFIRE NFPA 13 VS. NFPA 13R VS. NFPA 13D SUMMARY
These reductions can significantly reduce the flow for a remote area, resulting in less friction loss and ultimately a smaller system demand, even with smaller pipe sizes.

Specific Obstructions 

It's important to note that due to the different spray pattern, residential sprinklers have their own obstruction rules which differ from standard spray. Try out the Obstruction Calculator with residential-style sprinklers to see the difference.

Where Can Residential Sprinklers Be Used?

Residential style sprinklers are permitted in "dwelling units and their adjoining corridors, provided they are installed in conformance with their listing." [NFPA 13 2002-16 8.4.5.1]. Their limited to wet pipe systems unless listed for use in dry or pre-action, but this is often not a major inhibitor.
Sidewall Fire Sprinkler
Residential sprinklers are allowed to be used in wet systems within dwelling units and their adjoining corridors.

​Also of note is new verbiage in the 2013 edition of NFPA 13 annex which includes that "Residential sprinklers can only be used in corridors that lead to dwelling units. However, the corridors that lead to dwelling units can also lead to other hazards that are not dwelling units and can still be protected with residential sprinklers" [NFPA 13 2013-16 A.8.4.5.1]. 

This verbiage was included to clarify that just because other hazards might be adjacent to these same corridors does not mean residential style sprinklers cannot be used.

Summary

Residential sprinklers differ from standard spray in their response categorization and their water distribution. Both of these elements align with residential hazards, and their use offers some positive kickbacks to designers looking to use them in and around residential areas in buildings.


I hope you found this helpful. If you don't already get these articles and tools, you can easily subscribe to these free weekly articles here.
Johnny Davila
8/18/2020 04:45:34 pm

Can Residential horizontal sidewalls be installed 4 to 6" below a beamed ceiling where the beams are 16" deep..(obstructed construction) Beams are spaced 3 ft. on center..
Similar to a coffer ceiling....
This is to avoid any exposed pipes with uprights or pendents to the max. 22" deflector distance from the high ceiling between the beams.
Please help... Thanks.


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The views, opinions, and information found on this site represent solely the author shown and do not represent the opinions of any other party, nor does the presented material assume responsibility for its use. Fire protection and life safety systems constitute a critical component for public health and safety and you should consult with a licensed professional for proper design and code adherence. Some (not all) outbound links on this website, such as Amazon links, are affiliate-based where we receive a commission for orders placed elsewhere.
  • Blog
  • Daily
  • Exam Prep
    • CFPS Tools
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    • PE Tools
    • PE Prep Series
  • TOOLS
    • TOOLKIT (FREE TRIAL)
    • *TOOLKIT (PURCHASE)
    • SUBMIT AN IDEA
    • BACKFLOW DATABASE*
    • CLEAN AGENT ESTIMATOR
    • CLOUD CEILING CALCULATOR
    • DOMESTIC DEMAND
    • FIRE PUMP ANALYZER
    • FIRE PUMP DATABASE*
    • FIRE FLOW CALCULATOR*
    • FRICTION LOSS CALCULATOR
    • HANGER SPACER
    • IBC TRANSLATOR*
    • K-FACTOR SELECTOR
    • NFPA 13 EDITION TRANSLATOR ('19 ONLY)
    • NFPA 13 EDITION TRANSLATOR ('99-'19)*
    • LIQUIDS ANALYZER*
    • OBSTRUCTION CALCULATOR
    • OBSTRUCTIONS AGAINST WALL*
    • PLUMBING FIXTURE COUNTS
    • REMOTE AREA ANALYZER
    • QUICK RESPONSE AREA REDUCTION
    • SPRINKLER DATABASE*
    • SPRINKLER FLOW*
    • TEST & DRAIN CALCULATOR
    • THRUST BLOCK CALCULATOR
    • TRAPEZE CALCULATOR
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