§ 2-51. Location of tanks.

A. 

Inside storage gravity and auxiliary pressure tanks not enclosed in masonry or concrete shall be provided with securely attached, substantial incombustible supports, and be securely bolted to a cement floor or otherwise secured to avoid strains on piping, and shall not be located within seven feet, measured horizontally, from any fire or source of flame.

B. 

Tanks having a capacity of not more than 275 gallons each may be located in the cellar or basement above the floor level. No more than two such tanks shall be installed in connection with any one burner. Tanks of a capacity of 275 gallons and less may be used to supply oil to a burner by gravity, provided that there is a suitable automatic safeguard to prevent abnormal discharge of oil at the burner. When more than one storage tank is installed, such tanks shall be connected with the main feed pipe leading to the burner through a manually-operated three-way valve, so that not more than one tank can in any way discharge its contents at one time.

C. 

Storage tanks of over 275 gallons' individual capacity shall be placed in a protective enclosure having solid masonry walls not less than eight inches thick and of a dimension not less than 15 inches greater on all sides than the outside dimensions of the storage tanks. The walls of the enclosure shall be carried up to a height of not less than two feet above the top of the tank or to the ceiling where the ceiling is less than two feet above the top of the tank. A fireproof access door shall be installed in the enclosure above the point where the enclosure has a capacity equal to the largest tank installed, and for each additional 10 feet or fraction thereof by which the longest inside dimension of the enclosure exceeds 35 feet, an additional fireproof access door shall be similarly installed at one or more intervals of not less than 10 feet. Columns, pipes or similar obstructions may project into the required 15 inches of space within the enclosure, provided that access door or doors are so arranged that all portions of the enclosure are accessible. The ceiling above the tank enclosure shall be either fireproof or fire-retarded.

D. 

Storage tanks having a capacity greater than 275 gallons may be placed in the cellar or basement of any building, below the level of the floor, provided that they are so placed that the top of the tank is not less than 12 inches below the level of the floor and covered with not less than four inches of concrete.

E. 

Tanks outside of the building underground shall be located at least three feet from the wall of any building and at least three feet from any property line. They shall be so placed that the top of the tank is not less than two feet below the surface of the ground except that in lieu of the two-foot cover, the tank may be buried under 12 inches of earth and a cover of concrete at least six inches in thickness provided. Reinforcement shall extend 12 inches on the sides of the top of the tank.

F. 

Tanks of sixty-gallon capacity and less, may be under pressure, provided they shall be designed for six times the maximum working pressure. Working pressure shall not exceed 50 pounds per square inch, and shall be proved tight at twice the maximum working pressure. Pressure tanks shall be equipped with a reliable pressure gauge, and an automatic relief valve piped to a discharge by gravity to the storage tank.

G. 

No tanks shall be installed under sidewalks or highway.