Section 14a.35. Design and construction of tanks

(a) General. Tanks shall be designed and constructed to safely withstand the service to which subjected.

(b) Materials. Tanks shall be built of steel unless the character of liquids stored requires other material. Tanks built of materials other than steel shall be designed to specifications embodying principles recognized as good engineering design for the material used. Unlined concrete tanks may be used for storing flammable or combustible liquids having a gravity of 40 API or heavier. Concrete tanks with special lining may be used for other services if the design is in accordance with sound enginering practice. Tanks may have combustible or noncombustible linings. Special engineering consideration is required if the specific gravity of the liquid to be stored exceeds that of water or if the tanks are designed to contain flammable or combustible liquids at a liquid temperature below 0°F.

(c) Fabrication. Fabrication of tanks shall conform to the following:

(1) Tanks may be of any shape or type consistent with sound engineering design. Metal tanks shall be welded, riveted and caulked, brazed or constructed by use of a combination of these methods. Filler metal used in brazing shall be nonferrous metal or an alloy having a melting point above 1000°F. and below that of the metal joined.

(2) The following shall be the minimum requirements for construction of steel inside tanks:

(i) Underwriters’ Laboratories, Incorporated, Standard No. 80—1974, Specifications for Steel Inside Tanks for Oil Burner Fuel, shall apply to tanks of 660 gallons capacity or less.

(ii) Enclosed tanks of greater capacity than 660 gallons shall meet applicable design and construction requirements of this chapter for underground tanks if horizontal, and for aboveground tanks if vertical.

(3) If the vertical length of the fill and vent pipes is such that when filled with liquid the static head imposed upon the bottom of the tank exceeds ten psig the tank shall be designed for the maximum static head which will be imposed.

The provisions of this § 13.35 amended June 22, 1984, effective June 18, 1984, 14 Pa.B. 2131; transferred from 37 Pa. Code and renumbered as 34 Pa. Code § 14a.35, February 28, 2014, effective March 1, 2014, 44 Pa.B. 1233. Immediately preceding text appears at serial pages (259930) to (259931).

Notation

Cross References

This section cited in 34 Pa. Code § 14a.31 (relating to scope); and 34 Pa. Code § 14a.161 (relating to general provisions).