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Where the pressure at nozzles is more than 65 pounds per square inch, the one and one-half inch hose valve shall be provided with a device or disc to limit the pressure to 90 pounds so that the nozzle can be safely handled by one person.
(Prior code § 91-79; Amend Coun. J. 10-30-96, p. 31261, § 1)
An interior standpipe system required in a building, the top floor of which is more than 275 feet above grade, exclusive of space used for sprinkler, elevator, ventilation and other building machinery, shall be separated into two or more zones, each of which shall include a fire pump, pressure maintenance pump, and all other equipment and piping necessary for a complete inside standpipe installation. The lowest system shall serve the portion up to and including the story the floor of which is 275 feet or less above grade. Above 275 feet systems shall be provided to serve zones of not more than 20 stories each.
(Prior code § 91-81; Amend Coun. J. 10-30-96, p. 31261, § 1)
In a building having a top floor which is more than 275 feet above grade, individual zones, as required by this Code, shall be supplied by two or more separate risers from the zone fire pump located in the lowest story of the building, known as an express riser, except that the number of express risers shall not exceed the number of risers serving that zone; or by individual fire pumps located on the lowest floor of each zone taking suction under head from a tank automatically filled by two or more risers from the adjacent lower zone. Such a tank shall have a capacity sufficient to supply the largest pump in the zone at its rated capacity for at least 30 minutes but not less than 10,000 gallons.
(Prior code § 91-82; Amend Coun. J. 10-30-96, p. 31261, § 1)
At least one siamese connection shall be provided on each street exposure to a limit of two street exposures, except that 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 exposure is more than 250 feet long, there shall be two siamese connections for such exposure no closer than 200 feet apart. All siamese connections shall be located not less than 12 inches nor more than five feet above grade at the building line. Hose threads shall fit the couplings of the city fire department; they shall be provided with caps securely attached to the connection.
(Prior code § 91-83; Amend Coun. J. 10-30-96, p. 31261, § 1)
Each siamese connection shall be connected direct to the system through a four inch pipe with a straightway or silent type check valve in the connections; there shall be no other valves in the pipe connection. Each connection shall be drained between the check valve and the outside hose coupling.
(Prior code § 91-84; Amend Coun. J. 10-30-96, p. 31261, § 1)
Where the inside standpipe system has a single riser, the siamese connection shall be connected on the system side of the gate valve in the riser. Where the 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 shutoff the supply will be into the remaining risers. All piping shall be arranged to connect into the system by the most direct route as required by this code.
At each siamese connection, there shall be provided a flat square metallic plate attached to the siamese connection or the building near the connection on which shall be placed the word “Standpipe” if there is a single system, or the words “Low Level Standpipe: Basement (Or Subbasement): to Floor” or “High Level Standpipe: Floor to Floor” or other suitable marking if there is more than one system.
When a siamese connection serves both automatic sprinklers and a standpipe system the siamese connection shall be so identified.
(Prior code § 91-85; Amend Coun. J. 10-30-96, p. 31261, § 1)
All parts of the system shall be provided with indicating valves so that any portion can be taken out of service for repairs or in an emergency without interfering with the operation of the remainder of the system. Each system shall be provided with a gate valve so located as to control all sources of water supply except siamese connections. All valves in connections to water supply and from main to risers shall be outside screw and yoke pattern or other indicating type.
Check valves shall be installed in all sources of water supply including both suction and discharge side of the fire pump; they shall be straightway pattern or silent type installed in horizontal or vertical piping according to the valve's listing. A gate valve shall be installed on each side of each check valve unless otherwise noted.
All valves shall be rated for pressures not less than the maximum pressure developed at the point in the system where the valve is installed including the shutoff pressure of the fire pump.
All valves, including test and drain valves, shall have a durable sign attached indicating their function or area controlled.
A diagram drawn to scale showing the city connection, fire pump, siamese connections, standpipe main, risers and all valves shall be permanently posted in a conspicuous location in the pump room.
Gate valves controlling water supplies for main and risers shall be located where readily accessible. Valves shall not be located within concealed spaces.
All valves in mains and risers shall be secured open.
(Prior code § 91-86; Amend Coun. J. 10-30-96, p. 31261, § 1)
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