Section 27-930
§ 27-930 Existing standpipes. Standpipe systems existing on December
sixth, nineteen hundred sixty-eight shall not be required to be altered
to conform to the provisions of this subchapter, except as follows:
(a) The existing installation shall meet the following minimum
requirements:
(1) WATER SUPPLIES. There shall be a reserve of at least twenty-five
hundred gallons of water in a gravity or pressure tank for exclusive use
of the standpipe; or there shall be a direct connection to a city main
meeting the requirements of section 27-945 of article three of this
subchapter.
(2) GRAVITY TANKS. The gravity tank or tanks shall be filled by direct
city water connection or by an automatic fill pump at a rate of at least
forty-five gpm; and the bottom of the tank shall be located at least
eleven feet six inches above the highest hose outlet under the main
roof.
(3) HOSE AND HOSE VALVES. Hose and hose valves shall be in good
serviceable condition. Hose valve wheel handles shall be within six feet
six inches of the floors or stair landings or the wheel handle may be
within two feet horizontally from a stair tread and no more than six
feet six inches vertically above the tread. Such hose may be omitted
from hose racks in existing buildings in occupancy group J-2 provided
that the provisions of paragraph five of subdivision (c) of section
27-942 of article three of this subchapter are complied with.
(4) FIRE DEPARTMENT CONNECTIONS. There shall be a three inch by three
inch siamese hose connection with approved caps, painted red. The word
"Standpipe" shall be cast in the body of the siamese connection or on
metal plates that are secured to the riser or to the face of the
building behind the siamese connection.
(5) NOZZLES. A five-eighths inch smooth bore nozzle with two and
one-half inch hose shall be provided where the hydrostatic pressure at
the hose valve is less than ten psig.
(6) PROTECTION FROM FREEZING. All parts of the standpipe system that
are exposed to freezing shall be protected in accordance with the
requirements of subdivision (a) of section 27-949 of article three of
this subchapter.
(7) PRESSURE REDUCING VALVES. Pressure reducing valves shall be
provided as required by section 27-944 of article three of this
subchapter.
(8) DRIP VALVES. Drip valves shall be provided between the siamese
connection and the check valve.
(b) When the building requires additional standpipe protection because
of extension in height or in area, or the occupancy is changed to a use
requiring additional protection, the new or altered part of the system
shall comply with this subchapter.
Section 27-931
§ 27-931 Existing sprinklers. (a) Required sprinklers. Sprinkler
systems and devices existing on December sixth, nineteen hundred
sixty-eight shall not be required to be altered to conform to the
provisions of this subchapter, except that when additional protection is
required for a change in occupancy or for a building addition, the new
or altered part of the system shall comply with this subchapter.
Sprinklers in any extension or alteration shall be connected to, or
extended from, the existing system or a separate water supply as
provided in section 27-962 of article four of this subchapter.
Additional heads shall not be connected to existing undersized piping.
(b) Voluntary sprinklers. Sprinkler systems and devices existing on
December sixth, nineteen hundred sixty-eight, but which are not required
by this code, need not conform to the provisions of this subchapter,
except that when a siamese hose connection is installed in the system,
the siamese connection shall be installed and the entire system pressure
tested as required by this subchapter.