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Maximum number of Sprinklers on branch line || NFPA13

Maximum Number of Sprinklers on Branch Line According to NFPA13

Maximum Number of Sprinklers on Branch Line According to NFPA13
Maximum Number of Sprinklers on Branch Line According to NFPA13



According to NFPA 13 - 2022 edition (28.5.2.1.1), Branch lines shall not exceed eight sprinklers on either side of a cross main and shall be sized in accordance with the tables below for light and ordinary hazard occupancies:


Pipe Schedule for Light Hazard
Pipe Schedule for Light Hazard

Pipe Schedule for Ordinary Hazard
Pipe Schedule for Ordinary Hazard


Where more than eight sprinklers on a branch line are necessary, lines shall be permitted to be increased to nine sprinklers by making the two end lengths 1 in. and 11∕4 in. , respectively, and the sizes thereafter standard.

Ten sprinklers shall be permitted to be placed on a branch line, making the two end lengths 1 in. and 11∕4 in., respectively, and feeding the tenth sprinkler by a 21∕2 in. pipe.

The figure below, illustrates the above rules:

Maximum Number of Sprinklers on Branch Line According to NFPA13
Maximum Number of Sprinklers on Branch Line According to NFPA13


References:

NFPA 13 - 2022 edition (Standard for the Installation of Sprinkler Systems)


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