Of course, this characteristic has economic implications for the sprinkler installation since the energy necessary to supply the required flow and pressure to the sprinkler system will be significantly less for the systems utilizing large K-factor sprinklers. maximum ceiling height.Īs indicated, the required pressure to discharge 60 gpm of water decreases significantly as the K-factor increases. This configuration is a typical design for rack-stored, cartoned Group A plastics stored up to 20 ft.
ft., as referenced in NFPA 13 for sprinklers installed on a 10x10-foot spacing. This flow correlates to a design density of 0.60 gpm/sq. To further illustrate the desirable discharge characteristics of large K-factor sprinklers for storage protection, Table 2 provides information relative to the required pressure to discharge 60 gpm through a sprinkler. The K-factor is determined empirically by measuring the water flow rate and the water pressure at the sprinkler inlet, and then performing the following calculation: The discharge coefficient, commonly referred to as the K-factor, is the rate at which water can be delivered through a sprinkler as a function of the inlet pressure. The term “large K-factor sprinkler” is not specifically referenced in NFPA 13, but for the purposes of this article, the term refers to sprinklers having a K-factor of 11.2 gpm/psi1/2 or greater. What are Large K-Factor Sprinklers? The Standard for the Installation of Sprinkler Systems, NFPA 13, includes the sprinkler system design and installation criteria for many storage arrangements. The availability of a variety of sprinkler-protection tools assists building owners and designers in providing economical and effective sprinkler protection for these challenging fire risks. Many of these storage configurations create unique and formidable challenges for sprinkler systems.
To make the most efficient use of space, products and materials are being stored higher and in closer proximity to each other, which can increase the fire challenge significantly. The design and construction of storage facilities have changed in recent years as a result of the availability of innovative concepts and configurations used to store and distribute products.
Fire Protection & Design Special Section.Ethan Grossman: Water Cooler Conversations.
#PREFERRED SCALE FACTOR FIRE SPRINKLER DESIGN PROFESSIONAL#
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