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24.1.1 Number of Supplies

Amendment
This section has been amended by the state, county, or city.
Every automatic sprinkler system shall have at least one automatic water supply.
  1. Two automatic sources of water supply shall be provided for sprinklers in:
    1. Buildings classified in occupancy group H.
    2. Buildings classified in occupancy group M when the area on one floor exceeds 20,000 square feet (1858 m2).
    3. Buildings classified in occupancy group A-1 with stages larger than 1,000 square feet (93 m2) in floor area or with a stage height greater than 40 feet (15 240 mm).
  2. The domestic water supply may be used to supply any sprinklers required by Section 903 of the New York City Building Code when installed in buildings classified in occupancy groups B, E, I and R, and not classified as a high-rise building, provided that all the requirements stated in subdivision (d) of this section are met.
  3. The domestic water supply may be used to supply water to sprinklers in cooling towers if provision is made to automatically stop the use of water through the domestic supply lines and provided that all of the requirements stated in subdivision (d) of this section are met.
  4. When the domestic water is used to supply sprinklers as permitted in subdivisions (b) and (c) of this section, all of the following conditions shall be met:
    1. The domestic water supply line from the tank or street supply shall be at least the size of the sprinkler line and the capacity available shall be at least equal to the capacity required for the sprinklers.
    2. The domestic water supply line from the tank or street shall have the required pressure as provided in this referenced standard.
    3. The domestic water supply line shall be of non ferrous material except when the domestic water supply is four inches (102 mm) or more.
    4. An O.S.& Y. valve or other listed valve having visual indication, and sealed open, shall be installed in the sprinkler supply branch, or such other valve arrangement as may be provided in this referenced standard and in referenced standards NFPA-13R or NFPA 13-D as modified for New York City, as applicable.
    5. The pipe connecting the domestic water supply and the sprinkler control valve shall be of nonferrous material and not less than twelve inches (305 mm) long.
    6. The number of heads in each fire section shall not exceed six, except that the number of heads in each fire section may exceed six in buildings classified in occupancy group R-2, or R-3 not exceeding six stories or 75 feet (22 860 mm) in height and in spaces classified in occupancy group R-2, or R-3 in buildings not exceeding six stories or 75 feet (22 860 mm) in height, provided that no more than three heads are supplied from any one domestic water riser.
    7. The connection shall be made at the supply or riser side of any domestic branch control valves.
    8. In connection with the above conditions, the number of fire sections having 6 or fewer heads may be unlimited; and the installation of alarms in branches supplying fire sections shall be at the option of the owner, except that such alarms shall be provided where required by referenced standards NFPA-13R and NFPA-13D as modified for New York City.
    9. A check valve shall be installed on the sprinkler supply branch.
Water supplies shall be capable of providing the required flow and pressure for the remote design area determined using the requirements and procedures as specified in Chapters 11 through 22 including hose stream allowance where applicable for the required duration.
Except as provided in 24.1.3.2 or 24.1.3.3, no pipe smaller than 6 in. (150 mm) in diameter shall be installed as a private service main.

24.1.3.2

Amendment
This section has been amended by the state, county, or city.
For mains that do not supply hydrants, sizes smaller than 6 in. (150 mm) shall be permitted to be used subject to the following restrictions:
  1. The main supplies only automatic sprinkler systems, open sprinkler systems, water spray fixed systems, foam systems.
  2. Hydraulic calculations show that the main will supply the total demand at the appropriate pressure. Systems that are not hydraulically calculated shall have a main at least as large as the system riser.
Where a single main less than 4 in. (100 mm) in diameter serves both fire systems and other uses, the non-fire demand shall be added to the hydraulic calculations for the fire system at the point of connection unless provisions have been made to automatically isolate the non-fire demand during a fire event.
For pipe schedule systems, the underground supply pipe shall be at least as large as the system riser.
Water supplies and environmental conditions shall be evaluated for the existence of microbes and conditions that contribute to microbiologically influenced corrosion (MIC). Where conditions are found that contribute to MIC, the owners) shall notify the sprinkler system installer and a plan shall be developed to treat the system using one of the following methods:
  1. Install a water pipe that will not be affected by the MIC microbes
  2. Treat all water that enters the system using an approved biocide
  3. Implement an approved plan for monitoring the interior conditions of the pipe at established time intervals and locations
  4. Install corrosion monitoring station and monitor at established intervals
Water supplies and environmental conditions shall be evaluated for conditions that contribute to unusual corrosive properties. Where conditions are found that contribute to unusual corrosive properties, the owner(s) shall notify the sprinkler system installer and a plan shall be developed to treat the system using one of the following methods:
  1. Install a water pipe that is corrosion resistant
  2. Treat all water that enters the system using an approved corrosion inhibitor
  3. Implement an approved plan for monitoring the interior conditions of the pipe at established intervals and locations
  4. Install corrosion monitoring station and monitor at established intervals
Where listed biocides and/or corrosion inhibitors are used, they shall be compatible with system components. Where used together, they shall also be compatible with each other.
The connection between the system piping and underground piping shall be made with a suitable transition piece and shall be properly strapped or fastened by approved devices.
Where required due to specific mechanical or environmental conditions, the transition piece shall be protected against possible damage from corrosive agents, solvent attack, or mechanical damage.
When system piping pierces a foundation wall below grade or is located under the foundation wall, clearance shall be provided to prevent breakage of the piping due to building settlement.
Where meters are required by other authorities, they shall be listed.
The requirements of the public health authority having jurisdiction shall be determined and followed.
Where equipment is installed to guard against possible contamination of the public water system, such equipment and devices shall be listed for fire protection service.
Water supplies for sprinkler systems shall be one of the following or any combination:
  1. A connection to an approved public or private waterworks system in accordance with 24.2.2
  2. A connection including a fire pump in accordance with 24.2.3
  3. A connection to a water storage tank at grade or below grade installed in accordance with NFPA 22 and filled from an approved source
  4. A connection to a pressure tank in accordance with 24.2.4 and filled from an approved source
  5. A connection to a gravity tank in accordance with 24.2.5 and filled from an approved source
  6. A penstock, flume, river, lake, pond, or reservoir in accordance with 24.2.6
  7. *A source of recycled or reclaimed water where the building owner (or their agent) has analyzed the source of the water and the treatment process (if any) that the water undergoes before being made available to the sprinkler system and determined that any materials, chemicals, or contaminants in the water will not be detrimental to the components of the sprinkler system it comes in contact with
A connection to a reliable waterworks system shall be an acceptable water supply source.
The volume and pressure of a public water supply shall be determined from waterflow test data or other approved method.
A single automatically controlled fire pump installed in accordance with NFPA 20 shall be an acceptable water supply source.

24.2.3.1 Combined Use

Amendment
This section has been amended by the state, county, or city.
In light hazard occupancies with only limited ordinary hazard areas, an automatic fire pump serving the lower 300 feet (91 440 mm) of the standpipe system may be used as the primary supply to the sprinkler system, provided that an automatic switching secondary power supply is available to drive the pump, where secondary power is required by other provisions of this code, and that the pump is fully supervised as to pump running and power loss. The supervisory attachments shall be directly connected to an office where maintenance personnel are in attendance twenty-four hours a day; or, in lieu thereof, the supervisory attachment may be directly connected to the supervising station of an approved operating fire alarm company.

24.2.3.2

Amendment
This section has been amended by the state, county, or city.
In hydraulically designed sprinkler systems supplied from a gravity tank, the pressure may be increased by means of an automatic, special service fire pump. The pump shall be sized to satisfy the water supply requirements of this section and the New York City Building Code and shall be arranged with a bypass to permit the portion of the system so supplied to be served by the system's two-way Fire Department connections.

If the pump is not supplied from the street side of the building service switch, the electrical service and pump operation shall be fully supervised and an automatic switching secondary power supply provided to drive the pumps, where secondary power is required by other provisions of this code.

24.2.3.3 Wiring for Fire Pumps

Amendment
This section has been amended by the state, county, or city.
When the fire pump feeder conductors are routed through the building(s), they shall be enclosed by 2 inches (51 mm) of concrete or an assembly that has a minimum of 2-hour fire resistive rating. Wiring for all fire and sprinkler pumps shall be in accordance with the New York City Electrical Code.

24.2.3.4 Sprinkler Booster Pumps

Amendment
This section has been amended by the state, county, or city.
Where the pressure from the city water main is insufficient to comply with the requirements of this referenced standard, but is sufficient to provide at least 5 PSI (34 kPa) at the highest level of sprinklers as determined by test, an automatic, electrically driven pump installed for the purpose of boosting or increasing the city water pressure in the sprinkler system may be used subject to the following requirements:
  1. Pumps shall be of approved centrifugal type, capable of delivering at least 200 gpm (757 L/m), and shall be capable of supplying the calculated flow and pressure demand of the sprinkler system.
  2. Pumps shall be maintained under approved automatic control with closed circuit supervisory attachment. The supervisory attachments shall be directly connected to an office where maintenance personnel are in attendance twenty-four hours a day; or, in lieu thereof, the supervisory attachment may be directly connected to the supervising station of an approved operating fire alarm company. The supervisory alarm services shall be arranged so as to provide positive indication at an approved central office or sprinkler alarm panel board that the pump has operated or that the source of electrical supply has failed.
  3. Such pumps shall also comply with the applicable provisions of this referenced standard and the New York City Building Code pertaining to fire pumps, except that only one water supply shall be required.
  4. Power to such pumps shall be supplied from the street side of the building service switch. Secondary power shall be provided where required by other provisions of this code.
  5. If a secondary power supply is provided to drive the pump and such power supply is automatic switching, the 5 psi (34 kPa) requirement in 23.2.2.4 and the requirements of paragraph (d), for power to be supplied from the street side of the building service switch, may be waived.

24.2.4.1

Amendment
This section has been amended by the state, county, or city.
A pressure tank providing water supply in accordance with Table 11.2.2.1 or section 11.2.3 is an acceptable water supply source. The total available quantity of water in pressure tanks need not exceed 15,000 gallons (56 781 L) when there is a secondary source of water supply available from a gravity tank or a street connection. The maximum gross capacity of a single pressure tank shall be 9,000 gallons (34 069 L) and shall include the needed extra capacity to fill dry-pipe or preaction systems when installed.

24.2.4.1.1

Amendment
This section has been amended by the state, county, or city.
Each tank shall be kept at a maximum of 2/3 full of water and a minimum of 1/3 full of air maintained under a minimum pressure of 75 psig (517 kPa). The water-toair ratio shall be so proportioned and the tank so located that a minimum pressure of 15 psig (103 kPa) will be available on the highest line of sprinklers below the main roof when all the water has been discharged from the tank.

24.2.4.1.2

Amendment
This section has been amended by the state, county, or city.
The tank supports shall be designed on the basis of a full tank. The tanks shall be supplied with water through a fixed pipe, independent of the sprinkler piping and at least 2 inch (51 mm) in size. The water supply shall be capable of supplying the tank at a rate of at least 65 gpm (4 L/s) without decreasing the pressure in the tank. The tank shall have a fixed water level plate on the end of the tank opposite the gage glass, or equivalent devices, to indicate the level of the water in the tank.

24.2.4.1.3

Amendment
This section has been amended by the state, county, or city.
The air compressor shall be provided with automatic controls for maintaining the air pressure. The capacity of the compressor shall be sufficient to build up the tank pressure to 75 psig (517 kPa) within 3 hr. or less.

24.2.4.1.4

Amendment
This section has been amended by the state, county, or city.
Pressure tanks shall be provided with closed circuit high and low water and high and low air pressure alarms.

24.2.4.1.5

Amendment
This section has been amended by the state, county, or city.
Pressure tanks shall be located at or above the top level of sprinklers.

24.2.4.1 Acceptability

Amendment
This section has been amended by the state, county, or city.

24.2.4.1.1

Amendment
This section has been amended by the state, county, or city.

24.2.4.1.2

Amendment
This section has been amended by the state, county, or city.

24.2.4.1.3

Amendment
This section has been amended by the state, county, or city.

24.2.4.1.4

Amendment
This section has been amended by the state, county, or city.

24.2.4.2 Capacity

Amendment
This section has been amended by the state, county, or city.

24.2.4.2.1

Amendment
This section has been amended by the state, county, or city.

24.2.4.2.2

Amendment
This section has been amended by the state, county, or city.

24.2.4.3* Water Level and Air Pressure

Amendment
This section has been amended by the state, county, or city.

24.2.4.3.1

Amendment
This section has been amended by the state, county, or city.

24.2.4.3.2

Amendment
This section has been amended by the state, county, or city.

24.2.5 Gravity Tanks

Amendment
This section has been amended by the state, county, or city.
An elevated tank installed in accordance with NFPA 22 shall be an acceptable water supply source. If any of the sprinkler heads are supplied from domestic water tanks, the combined water supply in the tank shall be at least 5,000 gallons (18 927 L). Further, the sprinkler water supply shall be taken from the lowest level of the tank.

24.2.5.1 Combined Use

Amendment
This section has been amended by the state, county, or city.
In A, B, E, I and R Occupancies, with only limited ordinary hazard areas, the sprinkler and standpipe reserve may be common to both. The Reserve shall be sized for the greater demand, in accordance with NFPA 14, 7.10.1.3. For purposes of this section, limited shall be defined as less than 30 percent of the floor area on the given floor. Buildings whose occupancies are more than 85 percent light hazard may have a light hazard water supply, provided the ordinary hazard areas are designed for ordinary hazard requirements with respect to sprinkler spacing and pipe sizing.

24.2.5.2

Amendment
This section has been amended by the state, county, or city.
Combined standpipe and sprinkler systems may be used in Occupancies A, B, E, F, I, M, R and S. If an automatic fire pump is used as the primary supply, the requirements of 23.2.2.1 shall apply.
Water supply connections from penstocks, flumes, rivers, lakes, or reservoirs shall be arranged to avoid mud and sediment and shall be provided with approved double removable screens or approved strainers installed in an approved manner.
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