33 CFR §127.103

1. (a)If the waterfront facility handling LNG is in a region subject to earthquakes, the piers and wharves must be designed to resist earthquake forces.
2. (b)Substructures, except moorings and breasting dolphins, that support or are within 5 meters (16.4 feet) of any pipe or equipment containing LNG, or are within 15 meters (49.2 feet) of a loading flange, must—
   1. (1)Be made of concrete or steel; and
   2. (2)Have a fire endurance rating of not less than two hours.
3. (c)LNG or LPG storage tanks must have the minimum volume necessary for—
   1. (1)Surge protection;
   2. (2)Pump suction supply; or
   3. (3)Other process needs.