Structural Requirements [49 CFR 193.2155]

(A)A. The structural members of an impoundment system must be designed and constructed to prevent impairment of the system's performance reliability and structural integrity as a result of the following:#

(1)1. the imposed loading from:#

(a)a. full hydrostatic head of impounded LNG; [49 CFR 193.2155(a)(1)(i)]#

(b)b. hydrodynamic action, including the effect of any material injected into the system for spill control; [49 CFR 193.2155(a)(1)(ii)]#

(c)c. the impingement of the trajectory of an LNG jet discharged at any predictable angle; and [49 CFR 193.2155(a)(1)(iii)]#

(d)d. anticipated hydraulic forces from a credible opening in the component or item served, assuming that the discharge pressure equals design pressure; [49 CFR 193.2155(a)(1)(iv)]#

(2)2. the erosive action from a spill, including jetting of spilling LNG, and any other anticipated erosive action including surface water runoff, ice formation, dislodgement of ice formation, and snow removal; [49 CFR 193.2155(a)(2)]#

(3)3. the effect of the temperature, any thermal gradient, and any other anticipated degradation resulting from sudden or localized contact with LNG; [49 CFR 193.2155(a)(3)]#

(4)4. exposure to fire from impounded LNG or from sources other than impounded LNG; [49 CFR 193.2155(a)(4)]#

(5)5. if applicable, the potential impact and loading on the dike due to:#

(a)a. of the component or item served or adjacent components; and [49 CFR 193.2155(a)(5)(i)]#

(b)b. the LNG facility adjoins the right-of-way of any highway or railroad, collision by or explosion of a train, tank car, or tank truck that could reasonably be expected to cause the most severe loading. [49 CFR 193.2155(a)(b)(ii)]#

(B)B. An LNG storage tank must not be located within a horizontal distance of one mile (1.6 km) from the ends, or 1/4 mile (0.4 km) from the nearest point of a runway, whichever is longer. The height of LNG structures in the vicinity of an airport must also comply with Federal Aviation Administration requirements in 14 CFR Section 1.1. [49 CFR 193.2155(b)]#

AUTHORITY NOTE: Promulgated in accordance with R.S. 30:551.C.#

HISTORICAL NOTE: Promulgated by the Department of Natural Resources, Office of Conservation, LR 44:1051 (June 2018).#