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Sprinkler discharge and area of application shall be in accordance with Table 23.8.
Table 23.8 Early Suppression Fast-Response (ESFR) Sprinklers for Protection of Rubber Tires
Piling Method Pile Height Maximum Building Height Nominal K-Factor Orientation Number of Sprinklers Minimum Operating Pressurea
ft m psi bar
Rubber tire storage, on-side or on-tread, in palletized portable racks, open portable racks, or fixed racks without solid shelves Up to 25 ft (7.6 m) 30 9.1 14.0 (200) Upright/pendent 12a 50 3.4
16.8 (240) Upright/pendent 12a 35 2.4
22.4 (320) Pendent 12a 25 1.7
25.2 (360) Pendent 12a 15 1.0
Rubber tire storage, on-side, in palletized portable racks, open portable racks, or fixed racks without solid shelves Up to 25 ft (7.6 m) 35 11 14.0 (200) Upright/pendent 12a 75 5.2
16.8 (240) Pendent 12a 52 3.6
22.4 (320) Pendent 12a 35 2.4
25.2 (360) Pendent 12a 25 1.7
On-tread, on-side, and laced tires in open portable steel racks or palletized portable racks Up to 25 ft (7.6 m) 30 9.1 14.0 (200) Pendent 20b,c 75 5.2
16.8 (240) Pendent 20b,c 52 3.6
Rubber tire storage, on-side, in palletized portable racks Up to 25 ft (7.6 m) 40 12 16.8 (240) Pendent 12 52 3.6
Rubber tire storage, on-tread, or laced in open portable steel racks Up to 25 ft (7.6 m) 40 12 25.2 (360) Pendent 12 40 2.8
On-tread, on-side, and laced tires in open portable steel racks or palletized portable racks Up to 30 ft (9.1 m) 40 12 25.2 (360) Pendent 12 75 5.2
Note: Wet systems only.
aThe shape of the design area shall be in accordance with 23.6.3.
bWhere used in this application, ESFR protection is expected to control rather than to suppress the fire.
cThe design area shall consist of the most hydraulically demanding area of 20 sprinklers, consisting of five sprinklers on each of four branch lines. The design shall include a minimum operating area of 1600 ft2 (149 m2).

Related Code Sections

22.6 CMSA Requirements for Storage Applications, Rubber Tires
) Protection for Rubber Tires Piling Method Maximum Storage Height Maximum Ceiling/Roof Height K-Factor Type of System Number of Sprinklers ...