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