30 CFR 57.4430 - Surface storage facilities.
The requirements of this standard apply to surface areas only.
(1) Capable of withstanding working pressures and stresses and compatible with the type of liquid stored;
(4) Vented or otherwise constructed to prevent development of pressure or vacuum as a result of filling, emptying, or atmospheric temperature changes. Vents for storage of Class I, II, or IIIA liquids shall be isolated or separated from ignition sources. These pressure relief requirements do not apply to tanks used for storage of Class IIIB liquids that are larger than 12,000 gallons in capacity.
(c) Fixed, unburied tanks located where escaping liquid could present a hazard to persons shall be provided with—
Title 30 published on 2014-07-01.
No entries appear in the Federal Register after this date, for 30 CFR Part 57.