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WEEKLY TAKEAWAYS AS A FIRE PROTECTION ENGINEER

Components of a Fire Sprinkler

9/6/2017

3 Comments

 
Today we're diving into the basic components of a fire sprinkler:
Fire Sprinkler Components
Orifice (Opening)
The orifice varies in size, but has a major impact on the sprinkler's k-factor which ultimately governs the sprinkler's relationship between flow and pressure. Opening sizes vary fairly dramatically but in general are not a major driver for sprinkler selection.

Threading
The nominal threading sizes range in quarter-inch increments from 1/2-inch to 1-1/4-inch (although some dry pendent shafts do have 1-1/2-inch threads). Thread size of sprinklers can be gathered in the field simply by measuring the diameter of the thread shaft. Sprinklers with a k-factor greater than 5.6 are no longer allowed to have thread sizes of 1/2-inch (NFPA 13 2002-2016 Section 8.3.5).

Plug
The plug retains the water (and pressure) within the sprinkler and pipe network. Breakage of the liquid-filled glass bulb results in the release of the plug, and thereafter the water.

Sealed Liquid-Filled Glass Bulb
Modern commercial sprinklers mostly rely on the colored glass bulb as the thermal sensor in the fire sprinkler, but other types are still frequent as well. Color of the liquid within the bulb indicate the listed activation temperature of the sprinkler (and can be found in NFPA 13 2002-2016 Table 6.2.5.1).

Frame & Deflector
The frame can have many finishes, of which some of the more common are listed above. The deflector offers the basic premise of the fire sprinkler - which is to distribute water in a specific pattern to best combat a fire hazard within an enclosure. Deflectors vary depending upon the style of the sprinkler and work to achieve different objectives. A residential pendent, for example, throws water with greater emphasis to the walls and ceiling where hazards are more commonly present in residential occupancies.

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3 Comments
Ridley link
2/5/2018 05:55:33 pm

It's interesting to learn more about fire sprinklers. I had no idea that there was a liquid filled bulb that shows the activation temperature. I'll have to look at the sprinklers in the office I work at to check that out.

Reply
Ria Amelia Lawrence link
4/16/2018 11:37:07 pm

It sure was fascinating to be able to know more about the fire sprinkler system. What got my attention was the orifice and how you said that it can come in various sizes, and the size has an overall effect on the functioning of the system. I am glad that I researched about his because I am planning to get a sprinkler system for the family business. At least, now I know more and can choose the type of orifice to use. Thank you!

Reply
Manuel H. Jaylo link
10/30/2018 05:03:15 pm

Pls send catalogues and Quote for Complete fire Sprinkler System = Components & Accessories. Thanks.

Reply



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  • Blog
  • Daily
  • Exam Prep
    • CFPS Tools
    • NICET Tools
    • PE Forum & Errata
    • PE Problems
    • PE Store
    • PE Tools
    • PE Weekly Exams
  • TOOLS
    • COMING SOON
    • BACKFLOW DATABASE (MEMBER)
    • CLOUD CEILING CALCULATOR
    • FIRE PUMP ANALYZER
    • FIRE PUMP DATABASE (MEMBER)
    • FLAMMABLE & COMBUSTIBLE LIQUIDS
    • FRICTION LOSS CALCULATOR
    • K-FACTOR SELECTOR
    • OBSTRUCTION CALCULATOR
    • SPRINKLER DATABASE (MEMBER)
    • THRUST BLOCK CALCULATOR
    • TOOLKIT (MEMBER)
    • TRAPEZE CALCULATOR
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