SUPPORT FOR TANKS ABOVE GRADE: gravity-discharge elevated tanks should be mounted on sturdy, fire-resistant supports placed on firm, level surfaces. Supports should be concrete, masonry, or protected steel. Single wood timber supports (not cribbing) laid horizontally may be used as long as they are not more than 12 inches high at their lowest point. Steel supports or pilings must have a fire resistance rating of not less than 2 hours. Solid web steel saddles do not need to be protected if they are less than 12 inches high at their lowest point.
The design of the supporting structures for tanks shall be designed according to well established engineering principles of mechanics and must comply with the building code. Tanks shall be supported so that any excessive concentration of load does not fall on the supporting portion of the shell of the tank.
A support structure should provide a safe way for climbing up to fill the tank and to inspect the vent. As a fire safety measure, the bottom opening of gravity-discharge tanks should have a safety valve that closes automatically in response to heat from fire, thus stopping further fuel flow. Also, the hose nozzle should have a self-closing valve for positive fuel shutoff to prevent leaking or dribbling during refueling.
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