§ 2-52. Venting tanks.

A. 

All tanks shall have a separate vent pipe of ample size to prevent abnormal pressure in case of fire or when filling; in no case to be less than one-and-one-quarter-inch iron pipe size for tanks having a capacity of fifteen hundred (1,500) gallons. For tanks having a capacity of more than fifteen hundred (1,500) gallons, the vent pipe shall be at least two-inch iron pipe size.

B. 

The lower end of the vent pipe shall extend through the top of the tank for a distance of not more than one inch.

C. 

Vent pipes shall terminate outside of buildings at a point not less than two feet measured vertically or horizontally from any window or other building opening. Outer ends of vent pipes shall be provided with a weatherproof hood. Vent pipes shall terminate two feet above the ground to prevent their being obstructed with snow and ice. Ventpipes of tanks containing heaters shall be extended to a location where all vapors discharging from the vent shall be readily diffused without danger of ignition.