§ 29-15. Tanks aboveground., Chapter 29. Inflammable Materials, Code of Ordinances, North Hempstead

Levee or concrete retaining wall. Every tank or group of tanks having a capacity of twenty-five thousand (25,000) gallons or over shall be completely surrounded by a levee or reinforced concrete retaining wall.

Where a levee is used, it shall be made of clay core, cinder fill and suitable earthwork, free from stones and vegetable matter, shall be firmly and compactly built, to be continuous, with no openings of any kind for pipes or roadways and shall have a flat section on top not less than three (3) feet in width, and a height of not less than three (3) feet and not more than six (6) feet, and shall have slopes on both sides of not less than one and one-half to one (1 1/2:1). The enclosure within said levee shall have a cubic capacity equal to the largest tank plus ten percent (10%) of the remainder of the tanks surrounded.

Where a reinforced concrete retaining wall is used, said wall shall be of a design to be approved by the Building Department and the enclosure within said wall shall have a cubic capacity equal to that required where a levee is used as set forth in the preceding subsection.

Fire-extinguishing appliances. Every tank or group of tanks having a capacity of twenty-five thousand (25,000) gallons or more shall be equipped with foam fire-extinguishing equipment or other system approved by the Building Department. Each tank shall be fitted with a permanent pipe connection to which the central or movable tank generator may be attached.

Vents. An open vent pipe of design and construction approved by the Building Department shall be provided for each tank.

Pipes. All tanks of a storage system shall be so connected with each other by a system of pipes that the contents of each tank or container can be transferred to any other tank or container at will. All pipings shall be aboveground and shall be equipped with valves or other safety devices of a design construction approved by the Building Department.

Horizontal tanks. All tanks having a storage capacity of twenty thousand (20,000) gallons or less shall be horizontal tanks and shall be placed upon steel or concrete bases designed to carry the load.

Lighting. No system of artificial light other than vapor-proof, incandescent electric light shall be installed in any portion of a premises used for the storage of inflammable liquids.

Painting. No tank shall be painted within four (4) months after its erection, at which time each tank shall be scratch-brushed to remove the scale and painted with rust-resisting material.