(a) After June 27, 1949, all buildings or parts of buildings in which materials producing flammable dust or explosive dust are stored or handled which were not used for such purpose on June 27, 1949, shall be of Type I, fireproof construction or Type II, incombustible construction and shall be either independent buildings or separated from other occupancies by occupancy separations designed to withstand probable explosion pressures and having a fire resistance rating of not less than four (4) hours.
(b) All buildings where magnesium, aluminum or other specially hazardous powder is manufactured, processed or handled in unsealed containers, shall be isolated buildings located not less than three hundred (300) feet from other buildings not part of the same plant, and not less than three hundred (300) feet from lines on adjacent premises where buildings may be built.
(c) Buildings liable to explosion pressure from explosive dust and constructed of light incombustible construction shall, except as provided in subsection (b) hereof, be located not less than seventy-five (75) feet from all adjoining buildings and from all lines on other premises on which buildings may be built.
(d) The construction and interior finish of rooms or places where dust may accumulate shall be such as to eliminate, so far as possible, surfaces, ledges or other places where dust may settle or accumulate.
(e) So far as possible all equipment shall be and shall be maintained dust-tight. Equipment in which explosive dust may accumulate shall be provided with approved explosion vents. Equipment which may accumulate charges of static electricity shall be suitably grounded.
(f) Equipment, bins and vaults in which dusty material is produced, processed or handled shall, so far as practicable, be equipped with devices or systems for removing the dust in a safe manner to a safe location or with systems of inert gas for fire and explosion prevention installed in conformity with the applicable code listed in Section 385.30.
(g) No open flames and no motors or other electrical devices which may emit sparks shall be permitted within rooms or spaces where combustible or explosive dust may accumulate. All motors and switches which are not of approved dust-proof types shall be located outside of the room, space or equipment in which dust may accumulate. No construction or repair work involving the use of welding equipment or of open flames or of sparking devices, shall be performed within any room or space which is not dust-free or in which dust-producing equipment is in operation.
(h) Whenever there is the possibility of ferrous metal being present in material processed, approved separators for the removal of such metal shall be provided and operated.
(Ord. No. 991-49. Passed 6-27-49, eff. 6-27-49)