Table L.18. Facility Summary
The storage tanks are double-walled and double-bottomed with a suspended internal aluminum roof plate covered by a carbon steel dome.
The inner tanks are nine percent nickel steel and of welded construction. The outer tanks are constructed of welded carbon steel. The three original tanks are each supported by 974 pre-stressed, 14-inch by 14-inch by 75-foot piles which were driven 72 feet below grade to support the 21-inch thick concrete pile cap on which each tank rests. The new fourth tank is supported by 1,100 pre-stressed, 14-inch by 14-inch by 72-foot piles which were driven 70 feet below grade to support the 21-inch thick concrete pile cap on which it rests.
Highly efficient insulation fills the void between the inner and outer tanks and covers the inner roof plate.
The tanks maintain LNG in a liquid state by auto-refrigeration of the boil-off. Boil-off gas can be used for plant fuel, recombined with LNG before it is vaporized, or sent directly to send-out. Each tank has three submerged pumps of which two are required to meet maximum LNG send- out capacity.