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At least one siamese connection shall be provided for every sprinkler system having more than ten sprinklers. At least one siamese connection shall be provided on each street exposure where the building is located closer than 100 feet to the curb to a limit of two street exposures. One siamese connection will be permitted in the case of two adjacent street exposures whose combined length is not greater than 250 feet. If any street exposure is more than 200 feet long, there shall be two siamese connections at least 200 feet apart for such exposure. When a building is so situated that it has no street frontages the siamese connection shall be located at the main entrance.
Hose threads shall fit the couplings of the city fire department; they shall be protected with a cap securely attached to the connection.
Each siamese connection shall be connected directly to the system main through a four-inch pipe with straightway or silent check valve in the connection; there shall be no other valves in the pipe connection. Each connection shall be drained between the check valve and the outside hose coupling. For a sprinkler system having a single riser less than four inches in diameter the pipe between the exterior hose connection and the riser may be the same size as the riser. When the single sprinkler riser is three inches or less in diameter a single two and one-half inch hose connection may be provided.
Where the sprinkler system has a single riser, the siamese connection shall be connected on the system side of the gate valve in the riser for a wet system or between the dry valve and the gate valve for a dry system. Where a sprinkler system has two or more risers the siamese connections shall be connected on the supply side of the gate valve so that with any riser shut off the supply will be into the remaining risers. At each siamese connection, there shall be a flat rectangular metallic plate attached to the siamese connection or the building near the connection on which shall be the word “SPRINKLERS” and a description of the area or floors protected in letters not less than one inch in height and not less than one-fourth-inch face.
Siamese connections shall be located not less than 12 inches nor more than five feet above the grade at the building line. Siamese connections shall be located so that immediate access can be made by the fire department. Obstructions on, before, or around siamese connections shall not be permitted.
(Prior code § 91-23; Amend Coun. J. 10-30-96, p. 31216, § 1)