Page 6 - Maximizing installation flexibility and storage capacity using ESFR Storage Sprinklers
P. 6

 Table 1 – K-22.4 and K-25.2 ESFR Deflector-to-Ceiling Distance (in/mm)
45/13,7
Although NFPA 13:2019 requires K-22.4 and K-25.2 ESFR sprinklers to have an 18 inch (450mm) deflector-to-ceiling distance, not all K25.2 sprinklers meet this requirement.
Table 1 shows the currently listed and approved K-22.4 and K-25.2 ESFR sprinklers along with their UL Listed deflector- to-ceiling distance used in conjunction with a 45 foot (13,7m) ceiling height.
As shown in Table 1, Tyco Model ESFR-22 and ESFR-25 sprinklers are UL Listed with an 18 inch (450mm) deflector- to-ceiling distance as specified by NFPA 13:2019. The sprinklers are also FM Approved. It should be noted that
         Ceiling Height (ft/m)
Tyco ESFR-25
18/450
Alternative A ESFR-25
14/350 18/450
Alternative B ESFR-25
Tyco ESFR-22
 18/450 18/450
FM Global in Loss Prevention Datasheet 2-0 addresses sprinkler location using the thermal element-to-ceiling dimension.
In addition to approving the aforementioned sprinklers to a 45 foot (13,7m) ceiling height, the January 2020 edition of FM Global Loss Prevention Datasheet 8-9 approves ESFR or Storage Sprinklers up to a ceiling height of 55 feet (16,8m). Table 2 shows the thermal element-to-ceiling distance for FM Approved Storage Sprinklers at ceiling heights of 45 feet (13,7m), 50 feet (15,2m) and 55 feet (16,8m).
18/450
Alternative A ESFR-22
     Table 2 – K22.4, K25.2, K28.0 and K33.6 Storage (ESFR) Thermal Element-to-Ceiling Distance (in/mm) at 45 foot (13,7m), 50 foot (15,2m) and 55 foot (16,8m) Ceiling Heights
45/13,7
55/16,8
              Tyco ESFR-22
Alternative A ESFR-22
Alternative B ESFR-22
Tyco ESFR-25
Alternative A ESFR-25
ESFR-28
Tyco ESFR-34
      113 inches with 50 psi design, 17 inches with 75 psi design
Alternative B ESFR-22
 Ceiling Height (ft/m)
Alternative B ESFR-25
    17/431,8
17/431,8 17/431,8
17/431,8
13/330,2 17/431,8 N/A
N/A
                50/15,2
13/330,2
13/330,2
13/330,2 171/431,8
13/330,2 171/431,8
13/330,2 171/431,8
13/330,2 171/431,8
13/330,2
17/431,8
         N/A
N/A N/A
N/A
N/A N/A 13/330,2
17/431,8
     
















































   4   5   6   7   8