46 C.F.R. § 76.25-10 Size and arrangement of sprinkler heads and pipe sizes.
Title 46 - Shipping
(a) General. (1) The system shall be so designed and arranged that the overhead is effectively sprayed and that all portions of the deck are covered. (2) One-half inch sprinkler heads shall be used. Sprinkler heads shall be so arranged that no portion of the overhead or vertical projection of the deck is more than 7 feet from a sprinkler head. (b) Pipe sizes. (1) The sizes of branch lines, single cross mains, feed mains, and risers shall be in proportion to the number of sprinkler heads served. The minimum pipe sizes shall be as given in table 76.25–10(b)(1). (2) If a complete loop cross main is employed, the size of such cross main shall be in proportion to the number of sprinkler heads served. The minimum pipe sizes shall be as given in table 76.25–10(b)(2). The entire loop shall be of the same size pipe.
Title 46: Shipping
PART 76—FIRE PROTECTION EQUIPMENT
Subpart 76.25—Automatic Sprinkling System, Details
§ 76.25-10 Size and arrangement of sprinkler heads and pipe sizes.
Table 76.25-10(b)(1)------------------------------------------------------------------------ Maximum number of heads served --------------------------- Vessels whose Vessels construction constructed is more in general Minimum nominal pipe size, inches combustible agreement than that with set forth in §§ §§ 72.05-5 72.05-5 through through 72.05-60 72.05-60------------------------------------------------------------------------1........................................... 2 21\1/4\...................................... 3 31\1/2\...................................... 5 52........................................... 10 102\1/2\...................................... 20 403........................................... 40 2503\1/2\...................................... 65 ............4........................................... 100 ............5........................................... 160 ............6........................................... 250 ............------------------------------------------------------------------------
Table 76.25-10(b)(2)------------------------------------------------------------------------ Maximum number of heads served --------------------------- Vessels whose Vessels construction constructed is more in general Minimum nominal pipe size, inches combustible agreement than that with set forth in §§ §§ 72.05-5 72.05-5 through through 72.05-60 72.05-60------------------------------------------------------------------------1........................................... 5 51\1/4\...................................... 9 91\1/2\...................................... 13 132........................................... 22 302\1/2\...................................... 40 803........................................... 80 2503\1/2\...................................... 130 ............4........................................... 250 ............------------------------------------------------------------------------
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