The provisions of Section 905 of IBC are adopted by reference with the following modifications:
1. Add new Sections 905.2.1, 905.2.2, 905.2.3 and 905.2.4 to read:
"905.2.1 Water supply.
Where wet standpipes are installed in buildings that are 80 feet (24.4 m) or less in building height and the building is protected throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 or 903.3.1.2, the water supply for the building may be designed to provide 100 pounds per square inch (689 kPa) pressure with 500 gallons per minute (31.6 L/s) flowing from the two hydraulically most remote outlets in the standpipe system. The standpipe system shall be designed for full standpipe flow in accordance with NFPA 14.
905.2.2 Multiple systems required.
In buildings where the floor level of the highest story is more than 275 feet (83.8 m) above grade plane, two or more separate standpipe systems shall be provided. The lowest standpipe system shall serve the portion up to and including the story which is 275 feet (83.8 m) or less above grade plane. Above 275 feet (83.8 m) additional standpipe systems shall be provided to serve zones of not more than 20 stories each.
905.2.3 Express risers.
In buildings where the floor level of the highest story is more than 275 feet (83.8 m) above grade plane, individual standpipe systems, as required by Section 905.2.1, shall be supplied by two or more separate risers from the zone fire pump located in the lowest story of the building, 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 story 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 (37,854 L).
905.2.4 Pressure reducing devices.
Where the pressure at nozzles is more than 65 pounds per square inch (448 kN/m2), the 1 1/2-inch hose valve shall be provided with a device or disk to limit the force of the hose stream to 90 pounds (0.4 kN) so that the nozzle can be safely handled by one person."
2. Revise the exception to Section 905.3 to read:
"Exception: Standpipe systems are not required in Group R-2, R-3, R-4 and R-5 occupancies not more than four stories above grade plane."
3. Revise Section 905.3.1 to read:
"905.3.1 Height.
Class III standpipe systems shall be installed throughout buildings which exceed 55 feet in building height or where four or more stories are above grade plane or two or more stories are basements.
Exceptions:
1. Class I standpipes are allowed in buildings equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 or 903.3.1.2.
2. [Reserved.]
3. [Reserved.]
4. Class I manual dry standpipes are allowed in parking garages and parking facilities that are subject to freezing temperatures, provided that the hose connections are located as required for Class II standpipes in accordance with Section 905.5."
4. Revise exception 2 to Section 905.3.2 by deleting "automatic dry and semiautomatic dry standpipes or."
5. Delete Section 905.3.3.
6. Revise Section 905.3.4.1 by deleting "approved."
7. Revise Section 905.3.6 to read:
"905.3.6 Helistops and heliports.
Buildings with a rooftop helistop or heliport shall be equipped with a Class I or III standpipe system extended to the roof level on which the helistop or heliport is located."
8. Revise Section 905.3.7 by deleting "Chapter 36 of."
9. Revise Section 905.3.8 to read:
"905.3.8 Rooftop gardens, landscaped roofs, and occupiable rooftops.
Buildings or structures that have vegetative roofs, rooftop gardens, landscaped roofs or occupiable rooftops and that are equipped with a standpipe system shall have the standpipe system extended to the roof level on which the vegetative roof, rooftop garden, landscaped roof or occupiable rooftop is located."
10. Revise Section 905.4 to read:
"905.4 Location of Class I standpipe hose connections.
Class I standpipe hose connections shall be provided in all of the following locations:
1. In every required interior exit stairway, a hose connection shall be provided for each story above and below grade plane. Hose connections shall be located at the floor landing.
2. [Reserved.]
3. In every exit passageway, at the entrance from the exit passageway to other areas of a building.
4. [Reserved.]
5. Where the roof has a slope less than four units vertical in 12 units horizontal (33.3-percent slope), a hose connection shall be located to serve the roof or at the highest landing of an interior exit stairway with access to the roof provided in accordance with Section 1011.12.
6. Where the most remote portion of a nonsprinklered floor or story is more than 150 feet (45 720 mm) from a hose connection or the most remote portion of a sprinklered floor or story is more than 200 feet (60 960 mm) from a hose connection, the fire code official is authorized to require that additional hose connections be provided in approved locations."
11. Revise the exception to Section 905.4.1 to delete "approved."
12. Revise Section 905.5.3 by replacing "approved" with "permitted."
13. Revise Section 905.7.1 by deleting "in an approved manner."
14. Revise Section 905.9 by adding the following after the last sentence:
"All valves in supply pipes to standpipe systems shall be secured open."
(Amend Coun. J. 2-19-20, p. 14473, Art. II, § 31; Amend Coun. J. 10-7-20, p. 21791, Art. II, § 15))