15-28-260 Ventilation.

   Every asphalt, tar, pitch, resin or paraffin heating room, shall be provided with one or more window, skylights or other ventilating opening facing a public way, private alley, yard or other open space not less than 15 feet wide, with closures arranged to open for natural ventilation and having a combined area of not less than five percent of the total wall area of the room. The required combined area of openings which are arranged to open for ventilation shall be provided with sashes or dampers, or other closures, which shall be hung, overbalanced and held in place in such manner that an explosion or fire within the room will cause such sash, damper or closure to open for its full area; provided, however, that in lieu of such requirements it shall be permissible to provide a vent flue or flues extending directly to the outside air, which shall be used solely for the purposes of ventilating such room, which shall have a combined area of not less than five percent of the total wall area of the room, with an enclosure of the same fire-resistive value as is required for the enclosures of the room, and equipped with a normally closed noncombustible trap door arranged to open automatically in case of explosion or fire within the room. No such window, skylight, ventilating opening or vent flue required by this section shall be nearer than four feet, six inches to any other building or structure on the same premises or to any interior lot line.

(Prior code §  92-21)

15-28-270 Direct heating prohibited.

   It shall be unlawful to boil or heat pitch, asphalt, tar, resin, turpentine or paraffin where direct heat is used, unless in or on a fireproof building, or in an open space at least 15 feet distant from any building. This section shall not apply to portable kettles used for roofing, waterproofing and street paving.

(Prior code §  92-22)

15-28-280 Fire-resistive separation.

   Every room hereafter designed, erected, altered or converted for the purpose of heating asphalt, tar, pitch or resin by means of direct heat shall have an enclosure of not less than two-hour fire-resistive construction. Every doorway in any such room shall have a sill of six inches in height. Every inside doorway connecting any such room with another such room shall be provided with a 1-hour-rated fire door.

(Prior code § 92-23; Amend Coun. J. 10-7-20, p. 21791, Art. VI, § 75)

15-28-290 Floor area limit.

   No asphalt, tar or resin room shall have a floor area greater than 1,200 square feet.

(Prior code §  92-24)

ARTICLE VI. AMMONIUM NITRATE (15-28-300 et seq.)

15-28-300 Storage requirements.

   Quantities of ammonium nitrate or ammonium nitrate fertilizer, having no organic coating, in the form of crystals, flakes, grains or pills including fertilizer grade, dynamite grade, nitrous oxide grade and technical grade ammonium and ammonium nitrate phosphate (containing 60 percent or more ammonium nitrate by weight) or more than 50 tons total weight shall be stored only in building of Type IA, IB, or IIA construction.

   Type III or IV construction may be used if such building is equipped with a complete system of automatic sprinklers in accordance with Chapter 14B-9.

   The maximum height and areas of such buildings shall be in accordance with Chapter 14B-5. Quantities in excess of 2,500 tons shall be stored only in buildings of Type I or II construction and such buildings shall also have a complete installation of automatic sprinklers. All such buildings shall have ventilation in accordance with the requirements of Section 15-28-260.

   There shall be no connections to the city sewer system nor shall there be allowed any drain, trap, basement pit into which any molten ammonium nitrate could flow and be confined in the event of a fire. The storage of ammonium nitrate, coated or mixed with organic anticaking materials except blasting agents permitted in Chapter 15-20, shall not be permitted.

(Prior code § 92-25; Amend Coun. J. 10-7-20, p. 21791, Art. VI, § 76)

15-28-310 Arrangement of storage.

   The storage and handling of ammonium nitrate shall comply with the following requirements:

   (1)   Each storage pile of bags or other authorized packages and containers of such materials shall not exceed 15 feet in height, 20 feet in width and 50 feet in length. Such pile units shall be separated by a clear space of not less than 36 inches in width from the base to the top of the piles, serving as cross aisles. At least one service or main aisle in the storage area shall be not less than four feet in width. A clearance of not less than 30 inches shall be maintained from building walls and partitions and of not less than 36 inches from ceilings or roof structural members with a minimum of 18 inches from sprinkler deflectors.

   (2)   Ammonium nitrate storage areas shall be separated by a space of 30 feet or by a tight noncombustible partition having a fire-resistive rating of not less than one hour, from the storage of organic chemicals, corrosive liquids, compressed gases, flammable liquids and combustible materials or other contaminating substances such as sulphur, coal, flour and metallic power such as zinc, copper and magnesium where storage of such materials is permitted with ammonium nitrate.

   (3)   The storage of ammonium nitrate, coated or mixed with organic anticaking materials except blasting agents permitted in Chapter 15-20 shall not be permitted in the city.

(Prior code §  92-26)

15-28-320 Fire prevention requirements.

   No vehicles shall be used or stored inside a building used for ammonium nitrate storage. Regular removal of all trash and debris shall be followed. Electric light bulbs shall have guards to protect against mechanical injury.

(Prior code §  92-27)