Pittsburgh-Des Moines Orders Large Quantity Of Aluminum For LNG Ship And Land Use

Aluminum 'Company of America has announced receipt of orders for more than 33 million pounds of aluminum plate, extrusions and welding wire to foe used in tanks for landbased storage of liquefied natural gas and for LNG supertankers.

The orders, for two unrelated LNG projects, came from Pittsburgh-Des Moines Steel Co. PDM will build four storage tanks for the Cove Point (Md.) Import Terminal, and 20 storage vessels for Quincy Shipbuilding Division of General Dynamics for oceangoing tankers. The orders bring to approximately 100 million pounds Alcoa's commercial plate backlog for LNG applications.

The Cove Point Terminal, expected to be completed in late 1976, is the world's largest aluminum land-based LNG project. Housing four giant storage tanks, each with a capacity of 375,000 barrels, the 1,022-acre terminal will have a design capacity sufficient to meet the annual requirements of more than 1,000,000 homes.

Each of the double-wall storage tanks will measure approximately 141 feet (43 meters) high by nearly 169 feet (52 meters) in diameter— more than half the length of a football field. The inner shell will be built from 15 by 31-foot aluminum plates ranging from nearly two inches thick at ground level to approximately one-half inch at the top. The outer shell will foe carbon steel.

The terminal will receive the LNG equivalent of one billion cubic feet of gas each day from a fleet of specially designed supertankers. The tankers will travel nearly 4,000 miles from Algeria. An El Paso Natural Gas Co. subsidiary will purchase and ship the LNG to Cove Point, which is being constructed by a subsidiary of the Columbia 'Gas System, and will be owned jointly by Columbia and a Consolidated Natural Gas Company subsidiary.

The 20 LNG storage vessel for oceangoing supertankers will be constructed at PDM's new Charleston, S.'C., operations. Alcoa will supply flat and machined plate shapes, extrusions and welding wire. Each sphere will have a capacity of 25,000 cubic meters and an inside diameter of approximately 120 feet (36.5 meters). Each tanker will contain five spheres with a gross ship capacity of 125.000 cubic meters. The tankers will be built at Ouincy, Mass., for Cherokee Shipping Corp., for charter to subsidiaries of Energy Transportation Corp., a recently formed United States-flag vessel fleet.

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