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American River Awards 50-Barge Contract To Twin City Shipyard An order for 50 river cargo barges valued at about $5.5 million has been received by Twin City Ship- yard, Inc., St. Paul, Minn., John W. Lambert, president, announced. The fleet of hopper barges, each 195 feet long and 35 feet wide, was ordered by American River Trans- portation Company, St. Louis, Mo., a subsidiary of Archer Daniels Mid- land Co. The last barge of the order is scheduled to be delivered by De- cember 1, 1975. At present, Twin City Shipyard is turning out barges at the rate of one per week, but the production rate is being accelerated, Mr. Lam- bert noted. Twin City Shipyard's current backlog is about 130 barges, valued at about $15 million. Mr. Lambert said the new order from American River Transportation Company will extend the facility's backlog almost to 1976. He added the demand for river transportation equipment "continues to be very strong." The new semiautomated shipyard —the only one in the Upper Mid- THERMAL EXPANSION AND CONTRACTION OF INVAR MEAN COEFFICIENT OF LINEAR TEMPERATURE, RANGE, F EXPANSION, PER °F -^100 to 0 1.20 x10'4 -200 to 0 1.10 x10"6 0 to 200 0.70 xlO"4 j t -400 -300 -200 -100 0 100 TEMPERATURE, F 3. Increased capacity Invar allows for the only membrane design that eliminates corrugation. Its ex- tremely low coefficient of expansion (one tenth that of aluminum) limits thermal stress. Lower stress permits a flat design, without the complication of corrugated panels. A tanker using flat membrane construction has a primary membrane of .020-inch-thick Invar, a primary insulation layer of plywood boxes filled with perlite, a secondary membrane of Invar, a second layer of boxes with perlite, an inner hull, and an outer hull. THERMAL CONTRACTION OF ANNEALED INVAR FROM -423 TO 70 F. 4. Its uniformly low coefficient of expan- sion (.000068 in./in.) makes Invar the ideal choice for mammoth tankers. Invar meets all API and ASME codes for cryogenic service. For more data on Invar, the alloy of future LNG tankers, write to Dept. 10-73, The International Nickel Company, Inc., One New York Plaza, New York, N.Y. 10004. inco THE INTERNATIONAL NICKEL COMPANY, INC. In Canada, The International Nickel Company of Canada, Limited. P.O. Box 44, Toronto-Dominion Centre, Toronto 111. Ontario. In England, International Nickel Limited, Thames House, Millbank, London SWIP 4QF, England. west—features the most modern marine fabrication facilities. With a total of 105,000 square feet of enclosed floor space, the fa- cility is large enough (600 feet long and 140 feet wide) to accommodate four river cargo barges in various stages of fabrication. Twin City Shipyard is a subsid- iary of Twin City Barge & Towing Company, with headquarters in St. Paul. Twin City Barge has served the Twin Cities area since 1937, and Chicago since 1961. The company operates harbor towing, petroleum barge service and barge fleeting service around these cities. J. Kwangse Kim Joins ARCTEC As Consulting Engineer J. Kwangse Kim Jack W. Lewis, president of ARCTEC, Incorporated, has an- nounced that J. Kwangse Kim has joined ARCTEC as a consulting engineer. Mr. Kim's initial assign- ment is to determine ice loads for conical shaped structures to be used in the Arctic. Subsequently, he will participate in the conduct of model experiments of ships and offshore structures in model ice fields. These experiments will be conducted in ARCTEC's new ice model basin presently under construction in Co- lumbia, Md. Mr. Kim received his master's degree in naval architecture and marine engineering from the Uni- versity of Michigan, and prior to joining ARCTEC was employed on two important programs related to extended navigation season on the Great Lakes and Arctic marine commerce in Alaska. Both of these programs included economic and technical feasibility of marine trans- portation systems in ice-covered waters. During the conduct of the latter study, he developed new methods for the prediction of ship performance in pressure ridges and expanded on ship resistance predic- tions in uniform sheet ice. ARCTEC, Incorporated is a con- sulting engineering firm engaged in research, design, construction, and operations in the field of cold re- gions technology. Construction of the most advanced marine labora- tory has begun, and includes an ice model towing basin, a hydraulics laboratory, and a general purpose refrigerated flume. The new labora- tory will greatly enhance the capa- bility and services provided by the firm in ice engineering. 45
