§ 27-843 Construction of incinerators.

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.

§ 27-844 Construction of chimneys and charging chutes.

For requirements governing the construction of chimneys and charging chutes, see article four of subchapter fifteen of this chapter.

§ 27-845 Cleanouts.

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.

§ 27-846 Accessibility.

Sufficient space shall be provided around the incinerator and its appurtenances to facilitate cleaning, repair, and servicing. Clearance shall be provided to allow the cleanout doors to be completely opened so that all parts of the combustion chamber, ash pit, separation chambers, etc. may be reached and so implements used for this purpose can be freely manipulated. All dampers, gates, burners, valves, levers, etc., shall be accessible for repair and adjustment or replacement. No construction shall be located closer than sixteen inches to any part of an incinerator, except that noncombustible structural members two feet wide or less parallel to the incinerator, may be located as close as six inches to the incinerator, provided such members do not reduce accessibility to any moving parts of the incinerator.

§ 27-847 Cabinets and control wiring.

All control equipment shall be installed in dustproof, noncombustible cabinets. Such cabinets shall not be mounted on the incinerator. Conduits carrying control wiring for the incinerator shall not be fastened to the incinerator. All electrical work shall comply with the electrical code of the city of New York.

§ 27-848 Posting.

   (a)   Operating and maintenance instructions shall be permanently and conspicuously mounted under transparent protective covers in the incinerator room, together with the equipment use permit. The instructions shall include complete procedures for operating and maintaining fuel burners, dampers, and other devices, and shall state quantities and kinds of materials that may be burned.

   (b)   On every door that opens into a space in which a service opening into a refuse chute is located, or on the wall directly over the service opening into the chute, the following sign shall be permanently and conspicuously posted: "THROWING LIGHTED MATCHES, CIGARS OR CIGARETTES, CARPET SWEEPINGS, NAPTHALENE, CAMPHOR BALLS OR FLAKES, FLOOR SCRAPINGS, OIL SOAKED RAGS, EMPTY PAINT CANS, AEROSOL CONTAINERS, OR ANY OTHER FLAMMABLE OR HIGHLY COMBUSTIBLE OR EXPLOSIVE SUBSTANCE INTO THIS CHUTE IS UNLAWFUL AND SUBJECTS THE OFFENDER TO A PENALTY". Such signs shall be designed as follows:

      (1)   Signs on doors leading to the service openings and on walls over service openings shall be at least eight inches wide and three inches high, with lettering at least one-quarter inch high. The signs shall be located on the hall side approximately five feet above the floor.

      (2)   The lettering of the signs shall be of bold type, and shall be properly spaced to provide good legibility. The lettering and the background shall be of contrasting colors.

      (3)   Signs shall be durable and shall be securely attached to the door or wall.

      (4)   Sufficient lighting shall be provided so that the signs are easily readable at all times.

Article 19: Solid Fuel Fireplaces, Fireplace Stoves and Room Heaters