Modern In-rack Sprinkler Systems

 

With taller storage buildings and a greater recognition of high hazard commodities, a new generation of in-rack sprinkler systems have been developed. Reliable developed the N-RACK-EC® Extended Coverage In-rack Sprinkler System to substantially reduce the number of in-rack sprinklers required while maintaining a low water demand. In-rack sprinkler systems using min. K8.0 quick-response sprinklers with horizontal barriers or ESFR sprinklers as in-rack sprinklers are also available.

 

The “Virtual Floor”

Several modern in-rack sprinkler systems are now available that use a “Virtual Floor” concept. These in-rack sprinkler systems are designed to protect commodity stored in racks without assistance from the ceiling sprinkler system. This allows the ceiling sprinkler system to be designed independently of the in-rack sprinkler system by considering the highest level of in-rack sprinklers as a “virtual floor”. See the specific criteria in NFPA 13, 2019 edition, Section 25.8 and FM Data Sheet 8-9 Section 2.3.6 for complete details and limitations.

N-RACK-EC® in NFPA 13, 2019 Edition

(See NFPA 13 Section 25.8.3 for complete details)

 

Rack Types

Single-, Double-, and Multiple-row racks up to 15 feet 6 inches deep

 

Ceiling/Storage Height

Unlimited

 

Commodities

Class I-IV

Group A plastic commodity (Cartoned, Exposed, Expanded, and Nonexpanded)

 

Ceiling Sprinklers

Based only on commodity not protected by in-rack sprinkler system

 

In-rack Sprinklers

K25.2 Intermediate Temperature Extended Coverage Pendent Sprinklers: Reliable Model N252EC 212°F

 

Max. Vertical Spacing of In-rack Levels

20 feet for non-cartoned Group A plastic commodity

30 feet for Class I-IV and cartoned Group A plastic commodity

Horizontal barriers above in-rack levels

 

Max. Horizonal Spacing of In-rack Sprinklers

10 feet

 

**Use NFPA 13 Example Double-row Rack Layout Figure (attached)**

 

 

N-RACK-EC® in FM Data Sheet 8-9

(See FM Data Sheet 8-9 Section 2.3.6.8 for complete details)

 

Rack Types

Open Frame Single-, Double-, and Multiple-row racks

 

Ceiling/Storage Height

Unlimited

 

Commodities

Class I-IV

Cartoned Unexpanded Group A plastic commodity

 

Ceiling Sprinklers

Based on distance from highest in-rack level to ceiling (“Virtual Floor”)

 

In-rack Sprinklers

Quick-response K25.2EC Pendent Storage Sprinklers: Reliable Model N252EC

 

Max. Vertical Spacing of In-rack Levels

30 feet

Horizontal barriers above in-rack levels

 

Max. Horizonal Spacing of In-rack Sprinklers

8 feet 3 inches

 

**Use FM Data Sheet 8-9 Example Double-row Rack Layout Figure (attached)**

 

Every In-rack Sprinkler System

Reliable is the one source for every modern in-rack sprinkler system, including:

N-RACK-EC® Extended Coverage In-rack Sprinkler System using the Reliable Model N252EC Sprinkler ESFR In-rack Sprinkler System using the Reliable Model JL-14, JL-17, HL-22, or N25 Sprinkler K8.0 (min.) with Horizontal Barrier In-rack Sprinkler System using the Reliable Model F1FR LO, GFR K8.0, or GL112 Sprinkler
N252EC GL112