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Burners or other sources of heat shall be provided for all incinerators. Such heat sources shall be capable of maintaining a temperature of at least fifteen hundred degrees Fahrenheit at the discharge from the combustion chamber, and shall be equipped with safety devices to shut off the fuel in cases of ignition failure, flame failure, or insufficient draft.
Incinerators shall be constructed so as to be gas tight and shall be lined or protected with heat resistive materials suitable for the services required, as follows:
(a) Masonry incinerators. When the combined hearth and grate area is twenty square feet or less, or the number of habitable rooms served is one hundred or less, combustion chambers, separation chambers, and connecting gas passages shall be constructed of eight inch common brick thick and lined with four and one-half inch of refractory material with an intervening air space of one inch. When the combined hearth and grate area is more than twenty square feet, or the number of habitable rooms served is more than one hundred, combustion chambers, separation chambers, and connecting gas passages shall be constructed of common brick eight inches thick and lined with nine inches of refractory material with an intervening air space of one inch.
(1) TIES. Noncorroding metal ties shall be used at least every fifth course of common-brick. Structural steel angles, straps, and tiebacks shall be installed on all masonry incinerators having more than one hundred twenty-five cubic feet of combustion chamber volume.
(2) INTERIOR CONSTRUCTION. Interior walls, curtain walls, bridge walls, or baffles shall, in every case, be of refractory brick, at least nine inches thick.
(3) ARCHES. Sprung arches may be used if the span is less than four feet. Flat suspended type arches shall have a minimum of five inches of refractory material between the furnace heat and the hangers. Flat suspended arches shall have an insulated block roof at least two and one-half inches thick.
(4) ISOLATION. No structural supports for the vertical building flues or other parts of the building shall rest upon the incinerator; nor shall any metal guides, hangers, or structural steel parts of the incinerator be exposed to direct heat of combustion.
(5) THERMAL BLOCK INSULATION. High temperature block insulation shall be at least equal to type 3 specified in reference standard RS 14-10.
(6) REFRACTORY. Refractory material shall be firebrick or hydraulic setting castable refractory.
a. Firebrick. Firebrick shall be high duty, spall resistant and conform to type A reference standard RS 14.7.
b. Castable refractories. Castable refractories shall conform to reference standard RS 14.8 (Class F).
c. Mortar. Mortar for firebrick shall be air setting high temperature cement conforming to reference standard RS 14-14.
(b) Steel-cased incinerators. In lieu of the eight inch common brick outer wall and one inch air space required in subdivision (a) of this section, the outside enclosure of incinerators may be of no. 12 manufacturers standard gauge steel casing that is welded, riveted, or bolted to be gastight, with at least two thicknesses of two and one-half inch high-temperature block insulation applied with staggered joints.
(c) Other constructions. Other forms of incinerator construction, equivalent in terms of structural strength, insulating value, and temperature and erosion resistance, may be used, subject to approval by the commissioner.
Openings shall be provided so that all parts of the incinerator can be cleaned, including the ash pit, the combustion chamber, the passes of separation chambers, and the incinerator flue. Cleanouts shall be closed by tight fitting doors or covers, securely latched or otherwise held in a closed position. Ash pit and combustion chamber closures and frames shall be of cast iron or equivalent, with the frames securely attached to the incinerator.
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