Section 27-875
§ 27-875 Charging chutes for refuse reduction. Charging chutes shall
be constructed in accordance with the following requirements:
(a) Directly connected. When directly connected to the combustion
chamber of an incinerator, the chutes shall be gas tight with smooth
linings and shall conform to the following:
(1) They shall be constructed in accordance with the requirements for
medium temperature chimneys.
(2) They shall extend through the building roof and be open to the
outer air. The opening shall be equal to the required chute size at the
top floor.
(3) If a roof damper is used it shall be constructed to open
automatically under conditions of excessive pressure or temperature. The
roof damper shall be electrically interlocked with the auxiliary
burners.
(4) Each charging chute shall be provided with a spark arrester of
corrosion resistive, noncombustible construction in which the maximum
size of mesh opening shall not exceed three-quarters of an inch. The
cross-sectional free area of such arrester shall be not less than that
of the inside of the chute to which it is attached. The height of the
spark arrester shall be such that there will be a minimum of twenty-four
square feet of total free area provided for a chute height to sixty
feet; thirty-six square feet for a chute height from sixty-one feet to
one hundred twenty feet; and forty-four square feet for chute heights
over one hundred twenty feet. In no case, however, shall the height of
the spark arrester be less than one foot.
(5) Provisions shall be made for sterilizing the charging chute by
heating or purging at a temperature of at least four hundred degrees
Fahrenheit but not higher than one thousand degrees Fahrenheit.
(b) Not directly connected. When not directly connected to a building
service incinerator, the chutes shall be gas tight with smooth linings
and shall conform to the following:
(1) They shall be constructed in accordance with the applicable
requirements for shafts in table 3-5 and subchapter five of this
chapter.
(2) They shall extend through the building roof and be open to the
air. The opening shall be equal to at least one square foot.
(3) If a roof damper is used it shall be constructed to open
automatically under conditions of excessive pressure or temperature.
(4) Provisions shall be made for sterilizing the chute by spraying,
washing, or other equivalent means.
(5) Bins, containers, or rooms for receiving rubbish shall be
constructed as required by section 27-837 of article eighteen of
subchapter fourteen of this chapter and sprinklers shall be provided as
required by the construction provisions of subchapter seventeen of this
chapter.
(c) Sizes.
(1) The sizes of chutes directly connected to the incinerators in
buildings shall conform to table 15-9.
(2) Charging chutes not directly connected to the incinerator shall
have a cross-sectional free area adequate for the service intended.
(d) Charging doors. Charging doors, service openings, or hopper doors
for chutes may be located in separate rooms or compartments enclosed in
non-combustible walls or partitions, floors, and ceilings having a fire
resistance rating of at least one hour and a self-closing fire door with
a three-quarter-hour fire-protection rating. Service openings shall, in
no case, have a free area of more than one-third of the cross-sectional
free area of the chute to which they give access. All such openings
shall be substantially constructed of steel or the equivalent metal of
sufficient thickness to prevent distortion or other damage in normal
usage. The door shall be provided with counterweights, door checks, or
other equivalent means for automatically closing after use and where the
chute is connected directly to the combustion chamber of an incinerator,
the door shall be so constructed that the chute is closed off while the
hopper is being loaded. No part of the door shall project into the chute
at any time. The minimum height of charging door openings shall be
eleven inches, and the minimum width shall be thirteen inches.
(e) When charging chutes are located in multiple dwellings, in
addition to the requirements of this subchapter, the chutes shall be
constructed in accordance with the requirements for noise control of
chutes in subchapter twelve of this chapter.
Table 15-9 Minimum Size of Charging Chutes
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Building Height Location If Square If Round
------------------------------------------------------------------------
7 stories or less All 7 stories 22 1/2" x 22 1/2" 24" dia.
8 to 30 stories Top 7 stories 22 1/2" x 22 1/2" 24" dia.
8th to 30th
from the top 27" x 27" 30" dia.
31 stories and over Top 7 stories 22 1/2" x 22 1/2" 24" dia.
8th to 30th
from the top 27" x 27" 30" dia.
Remaining lower 32" x 32" 36" dia.
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Section 27-876
§ 27-876 Chimneys for building service incinerators. Chimneys for
building service incinerators shall be constructed in accordance with
the requirements of this subchapter for high or medium temperature
chimneys, based upon the temperature of the flue gases leaving the
equipment, except that no reduction of flue gas temperature shall be
recognized if such reduction is the result of using water scrubbers or
barometric dampers. In addition, such chimneys shall comply with the
following:
(a) Chimneys shall extend through the roof and be open to the air.
(b) Chimneys shall be provided with a spark arrester as required in
paragraph four of subdivision (a) of section 27-875 of this article.
(c) Incinerators may discharge into chimneys serving other equipment
provided such combined chimney is of adequate size for both uses,
conforms to construction required for the highest temperature, and
adequate draft control equipment is provided for each device connected
to the combined chimney.
Section 27-877
§ 27-877 Chimneys for industrial or municipal incinerator plants.
Chimneys for central incinerator plants shall be constructed in
accordance with the requirements for:
(a) Medium temperature chimneys if the incinerator is provided with a
heat recovery unit or other means to assure a flue gas temperature not
in excess of one thousand degrees Fahrenheit at the base of the stack.
(b) High temperature chimneys if the incinerator has no heat recovery
unit or other means to assure a flue gas temperature less than one
thousand degrees Fahrenheit.
Section 27-878
§ 27-878 Incinerator chimney connectors. (a) The chimney connector
from the combustion chamber of an auxiliary fuel-fired incinerator shall
be constructed of metal at least as heavy as no. 16 manufacturers
standard gauge when twelve inches or less in diameter or greater
dimension, and of metal at least as heavy as no. 12 manufacturers
standard gauge when they exceed twelve inches in diameter or greater
dimension.
(b) Chimney connectors from auxiliary fuel-fired incinerators shall be
lined with firebrick, laid in fire clay mortar, at least two and
one-half inches thick when they are between twelve inches and eighteen
inches in diameter or greater dimension and at least four and one-half
inches thick when they are larger; where no flue gas temperature
reduction is effected the chimney connectors shall be equipped with a
guillotine or horizontal sliding damper or butterfly damper interlocked
with the fuel firing controls so that operation of the incinerator
occurs when the damper is open. If chimney connectors from auxiliary
fuel-fired incinerators lead into and combine with chimney connectors
from other equipment, the connectors from the other equipment shall also
be lined as required for direct flue connections unless the
cross-sectional area of the connector into which they lead is at least
four times their required cross-sectional area.
(c) Chimney connectors for an auxiliary fuel-fired incinerator to a
boiler stack or chimney for a high temperature heating equipment shall
be permitted when the cross-sectional area of such stack or chimney is
at least four times that of the incinerator chimney connector.
(d) The clearance of incinerator chimney connectors from combustible
material or construction shall be at least thirty-six inches. This
clearance may be reduced as outlined in table 15-8 in accordance with
the type of protection applied to the combustible material or
construction.
To the extent possible under law, Friends of Devin Balkind for Public Advocate has waived all copyright and related or neighboring rights to New York City Administrative Code. This work is published from: United States.
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