Page 4 - Maximizing installation flexibility and storage capacity using ESFR Storage Sprinklers
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Johnson Controls has been a pioneer in developing Early Suppression Fast Response (ESFR) Sprinklers for storage applications, beginning with the introduction of the first ESFR sprinkler, the K-14.0 ESFR-1, in the late 1980s and the K-25.2 ESFR-25 in the late 1990s. This line has expanded in the decades since and with the addition of the K-33.6 Tyco® Model ESFR-34 in 2020, Johnson Controls now has the most complete ESFR line of storage sprinklers. This portfolio provides the most installation flexibility and maximum potential storage capacity when compared to other ESFR sprinklers.
The Tyco Model ESFR-22 and Model ESFR-25 are Early Suppression Fast Response Sprinklers for High-Piled Storage Occupancies in accordance with the National Fire Protection Association NFPA 13:2019. The Tyco Model ESFR-22,
Model ESFR-25 and Model ESFR-34 are “Storage Sprinklers” in accordance with FM Global Loss Prevention Data Sheets 2-0 and 8-9.
Providing maximum flexibility for sprinkler system design, installation and maintenance is a major goal in developing fire protection products and protection schemes. This is particularly important in warehouse applications where an effective fire sprinkler system can minimize construction and installation costs while maximizing the economic benefit for the warehouse operator.
There has been significant progress in fire sprinkler capabilities since the 1990s. ESFR sprinklers can provide flexibility through ceiling-only storage protection – which, as the term implies, means there are no automatic fire sprinklers in the storage racks and automatic fire sprinklers installed at the ceiling provide fire protection. While in-rack sprinklers are capable of providing effective fire protection, having the sprinklers and piping located within the racks reduces storage and rack flexibility, takes up volume from valuable commodity and increases the risk of damage to a sprinkler or piping. Ceiling-only protection schemes using ESFR automatic fire sprinklers now exist for ceiling heights up to 55 feet (16,8m) and 50 feet (15,2m) of storage with commodities as hazardous as cartoned non-expanded plastic.
This paper will analyze two important factors: (1) the distance the automatic fire sprinkler is located below the ceiling and (2) the minimum aisle width – and demonstrate why these factors can allow for greater flexibility for installation and storage.

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