46 C.F.R. § 76.25-5 Zoning.
Title 46 - Shipping
(a) The automatic sprinkling system shall be divided into separate zones to restrict the area covered by any particular alarm signal. (b) No sprinkling zone shall contain more than 250 sprinkler heads. (c) The sprinkling zone may cover more than one deck, in which case, the boundaries shall be maintained in a vertical line insofar as is reasonable and practicable. The boundaries of the zone shall be coincident with bulkheads of Class “A” construction such as main vertical zone or watertight bulkheads. (d) Spaces in different main vertical zones shall not be included in the same sprinkling zone.
Title 46: Shipping
PART 76—FIRE PROTECTION EQUIPMENT
Subpart 76.25—Automatic Sprinkling System, Details
§ 76.25-5 Zoning.
