§ 303. Standard test and storage of refined petroleum and kerosene oil. Refined petroleum or kerosene oil shall not be kept on sale or stored in any such city, the fire test of which shall be less than one hundred and ten degrees Fahrenheit, determined by authorized inspectors using G. Tagliabue's or other improved instruments; and the barrels or packages containing the same shall be legibly stamped or marked with the inspector's official stamp or mark. If stored above the cellar or basement of any building and in barrels of not over forty-five gallons each, or in metallic vessels or tanks for the convenience of retailing, the quantity so stored shall not exceed the contents of ten barrels, unless packed in hermetically sealed metallic packages, when such quantity shall not exceed one hundred barrels. If stored in cellars or basements surrounded by walls of brick or stone, and at least two feet below the level of the sidewalk, street or adjacent land, such quantity shall not exceed the contents of one hundred and fifty barrels, unless stored in warehouses specially adapted for the purpose pursuant to this article. No more than five barrels thereof shall be kept or stored in any building occupied wholly or in part as a dwelling.

Not more than ten barrels of benzine or naphtha shall be kept or stored in any building, and not more than three barrels thereof in any building any part of which is occupied as a dwelling.

This and the preceding section shall not prevent the storage of crude or refined petroleum in wrought-iron tanks detached from any building and especially adapted for that purpose, or in other tanks so constructed that the top is at least two feet below the street or the adjoining land and covered with at least one foot of earth, and appurtenant to or connected with a refinery, with the approval of the inspectors of buildings, fire marshal or other proper authorities.