Pennsylvania Code
Title 34 - LABOR AND INDUSTRY
Part I - Department of Labor and Industry
Chapter 14a - STORAGE AND USE OF FLAMMABLE AND COMBUSTIBLE LIQUIDS
Subchapter C - SPECIAL PROVISIONS AND PROCEDURES
PROTECTION OF TANKS IN FLOOD AREAS
Section 14a.212 - Aboveground tanks

(a) Each vertical tank shall be located so that its top extends above the maximum flood stage by at least 30% of its allowable storage capacity.

(b) Horizontal tanks located so that more than 70% of the tank's storage capacity will be submerged at the established flood stage shall be anchored; attached to a foundation of concrete or of steel and concrete of sufficient weight to provide adequate load for the tank when filled with flammable or combustible liquid and submerged by flood water to the established flood stage; or adequately secured from floating by other means. Tank vents or other openings which are not liquidtight shall be extended above maximum flood stage water level.

(c) A dependable water supply shall be available for filling an empty or partially filled tank, except that where filling the tank with water is impractical or hazardous because of the tank's contents, tanks shall be protected by other means against movement or collapse.

(d) Spherical or spheroid tanks shall be protected by applicable methods as specified for either vertical or horizontal tanks.