15-16-760 Types of systems.

   Inside standpipe systems may be:

   (a)   Wet, in which the pipes are kept filled with water.

   (b)   Dry, in which a portion of the piping nearest the hose outlets normally is kept filled with air under pressure and so arranged that the operation of an outlet will automatically admit water to the system. Dry systems shall be used only when a wet system is impractical on account of a deficiency of heat in the area in which piping is located.

   (c)   Manual dry, in which a permanent water supply is not attached to the system, and which requires water from a Fire Department pumper to be pumped into the system through the Fire Department connection in order to meet the system demand. Manual dry systems shall be used only as provided in Section 15-16-090(a)(5).

(Prior code § 91-57; Amend Coun. J. 10-30-96, p. 31261, § 1; Amend Coun. J. 1-23-19, p. 94952, Art. II, § 2)

15-16-770 Sources of water supply.

   The water supply for inside standpipe systems shall be taken from a source sufficient to provide a minimum pressure of 65 pounds per square inch with 500 gallons per minute flowing at the highest hose outlet. The total water supply capacity shall be not less than 500 gallons per minute for the first standpipe and 250 gallons per minute for each additional standpipe riser, but no standpipe system need have a capacity greater than 1,500 gallons per minute. The water supply shall be capable of providing the required flow for not less than one-half hour.

(Prior code §  91-58; Amend Coun. J. 10-30-96, p. 31261, § 1)

15-16-780 Fire pumps.

   Where fire pumps are used to meet the water supply requirements, the minimum capacity of such pumps shall be 500 gallons per minute at a pressure of not less than 100 pounds per square inch. However, no one pump need have a capacity of more than 1,500 gallons per minute.

(Prior code §  91-59; Amend Coun. J. 10-30-96, p. 31261, § 1)

15-16-790 Use for other services.

   An inside standpipe system and a sprinkler system may be connected to the same water supply; provided, however, the water supply is of sufficient capacity for the automatic sprinkler system plus one-half of the standpipe demand. It shall provide sufficient pressure for the more severe demands.

   An individual riser used to supply both hose connections and automatic sprinklers shall be calculated to deliver the sprinkler demand as determined in Sections 15-16-270 or 15-16-600 plus 250 gallons per minute for a hose stream but not less than 500 gallons per minute.

(Prior code §  91-60; Amend Coun. J. 10-30-96, p. 31261, § 1)

15-16-800 Fire pump requirements.

   Pumps shall be of a centrifugal type. Pumps and auxiliary equipment, including controllers, required to form complete pumping units shall be of a type designed and developed for fire protection service and listed by a product testing laboratory which regularly tests fire protection equipment and conducts periodic inspection of the production of listed equipment. Pumps and controllers shall be plainly marked to show the manufacturer, model designation, pump capacity and pressure, and controller electrical rating.

   Where pumps or controllers are provided to service more than one area or zone, pumps and controllers shall be identified as to the area or zone served by permanent signs.

   Each pump shall be installed in accordance with N.F.P.A. Standard 20, Standard for the Installation of Centrifugal Fire Pumps, 1993 Edition except as herein modified.

(Prior code §  91-61; Amend Coun. J. 10-30-96, p. 31261, § 1)

15-16-810 Pumps supplied from city main.

   If the supply is taken from a city main, the pumping unit shall be designed to develop its full capacity at its rated pressure; provided, however, that if it is the source of supply for an upper standpipe system in a building having multiple systems, it may take its suction from the discharge of the fire pump for the system immediately below, but all piping shall be arranged so that pressure from the higher pressure system cannot be delivered to the lower pressure system.

(Prior code §  91-62; Amend Coun. J. 10-30-96, p. 31261, § 1)

15-16-820 Fire pump auxiliary equipment.

   Pumps shall be designed for automatic starting and stopping. Control shall be by means of a pressure- activated switch having independent high and low calibrated adjustments in the control circuit. The switch shall be responsive to water pressure in the fire protection system. Each controller shall have its own individual pressure sensing line. The pressure sensing line connection for each pump shall be made between that pump's discharge check valve and discharge control valve. There shall be no shutoff valve in the pressure sensing line.

   A time delay device set for one minute for each 10 horsepower of motor rating to a maximum of seven minutes continuous operation after each start shall be provided. A separate automatically controlled pressure maintenance pump shall be provided.

(Prior code §  91-63; Amend Coun. J. 10-30-96, p. 31261, § 1)

15-16-830 Pressure-control devices.

   All pressure-controlling and pressure-limiting devices installed in connection with a fire pump shall be designed for operation over a minimum range of zero to 300 pounds per square inch.

(Prior code §  91-64)

15-16-840 Pump suction piping.

   The suction pipe size to a fire pump shall be six inches for 500 and 750 gallons per minute pumps and eight inches for 1,000 and 1,500 gallons per minute pumps. This pipe shall be directly connected to the city main or suction source free from any meter (except a detector meter installed in a bypass around a check valve). The city connection shall be increased two inches if used for both domestic consumption and fire protection demands when the domestic service exceeds two inches in diameter.

(Prior code §  91-65; Amend Coun. J. 10-30-96, p. 31261, § 1)