View non-flash version
1. UNLOCK 2. OPEN TIME: 30 Seconds Memarco Rapid Action Deck Cover The quick, simple way to seal deck openings. Forget about cumbersome studs and nuts. Our Rapid Action Deck Cover locks and un- locks in seconds. It fits a standard 12Vi" open- ing and is adjustable to any deck plate thick- ness up to 3". All bronze construction makes it non-spark- ing. Buna-N seal makes it watertight. And, best of all, its removable, special wrench makes it theft proof. Throw away your old steel plate covers and try ours. You won't be sorry. MECHANICAL MARINE CO., INC. 900 Fairmount Avenue Elizabeth, New Jersey 07207 Phone: (201) 351-5400 Umpqua Fleet Lowers Costs On Jetty Building Projects The efficiency of its marine fleet allows Umpqua to bid succeessfully on far-flung jetty construction projects. By integrating an efficient marine fleet with its construction and quarrying operations, an Oregon firm successfully bids a number of major jetty building projects along the Pacific Northwest coastline. Umpqua River Navigation Co., a division of Bohemia Inc., relies on its fleet of two oceangoing tugs and a river towboat to transport rock eco- nomically from its quarry to the jetties. This, in itself, is hardly unique, but the distances involved in Umpqua's case do make it unique. Umpqua has built jetties along the coast from Eureka, Calif, to Westport, Wash. All the rock for these projects comes from the company's quarry in Camas, Wash., on the banks of the Columbia River 10 miles east of the Portland- Vancouver area. A combination of factors, including ideal rock formations in the quarry, its location on the bank of a navigable river, and efficient management and dependability of the marine fleet, makes it possible for Umpqua to utilize rock from the Camas quarry more economically than is possible from sources nearer the jetty sites. The entire marine operation moves in cadence. It takes one shift at the quarry to load a 3,600-ton barge. Meanwhile, the towboat Jupiter is pushing a loaded barge on the one-day round trip from Camas to Astoria, Ore., a't the mouth of the 'Columbia. There, one of the two oceangoing tugs picks up the loaded barge, while the other is enroute to Astoria with an empty. Dependable equipment and efficient timing are vital to Umpqua's ability to move the rock eco- nomically over such great distances. The two oceangoing tugs are the Bohemia and the Umpqua, sister ships built by Albina Engine & Machine Works in Portland—the Umpqua in 1966 and the Bohemia in 1970. Both are 95 feet by 28 feet by 14.5 feet, and rated at 188 gross tons. The Bohemia is powered by twin 1,125-hp Caterpillar D399 Diesels through Lufkin RLS- 2120 gears with 5:1 ratios to twin five-bladed stainless steel wheels. The keel-cooled V-16 die- sels have Mathers controls and shaft brakes. Auxiliaries are two Cat D333 Diesels driving 125-kw EM generators. Accessory drives at the front of each auxiliary engine power hydraulic pumps. The older tug, the Umpqua, is identical, except that it uses a pair of 850-hp Cat D398 Diesels driving through 5.11:1 Cat 3192 gears for main power. The towboat Jupiter, built in 1966, has a pair of 565-hp Cat D379 Diesels with 4.34:1 Cat 3192 gears. Two Cat D311 Electric Sets provide aux- iliary power. Shuttling barges loaded with jetty stone is demanding on the boats and equipment. The Umpqua has already accumulated 21,000 hours, the Bohemia, 6.000," and the Jupiter 20,000. Umpqua also owns the Juno, a twin-screw tug powered by a pair of Cat D343s, which supports a sand and gravel operation on the Umpqua River. The company also uses two single-screw Cat- powered tugs in its logging operations. The marine operation presently supplies rock to jetty projects at Gray's Harbor, Wash., and Tillamook Bay, Ore., where the south jetty is being extended 2,800 feet. The oceangoing tugs tow at eight knots and cycle between Astoria and Tillamook Bay in about 16 hours. Umpqua began business in the mid-19th Cen- tury with a steam-powered sternwheel ferry on the Umpqua River. They gradually moved into general towing and sand and gravel operations before diversifying into heavy construction in 1960. Bohemia Lumber acquired the firm in 1969. Besides their marine activity in support of jetty construction, Umpqua is also cooperating with the Environmental Fluid Dynamics Laboratory at Oregon State University on a special research project. They are building what is said to be the largest laboratory in the world, where the com- bined effect of wind and waves on jetties and arti- ficial rock islands can be studied simultaneously. The jetties and rock islands used in the studies will be built to scale. Bohemia Lumber and the Umpqua Division headquarters are in Eugene, Ore. O.H. Hins- dale is vice president of the Umpqua Division; John Schaefer, general manager; Buck Schaef- er, John's father, is superintendent of the Camas quarry, and Dale Krug, equipment su- perintendent at Camas, is in charge of the ma- rine fleet. Ducted Propellers Symposium To Be Held May 30-June 1 The program of papers for The Royal In- stitution of Naval Architects (RINA) Sym- posium on Ducted Propellers which is to be held on May 30, 31, and June 1, 1973, hals been completed. Seventeen papers by authors from various countries will be presented. They will deal mainly with ducted propellers of the ac- celerating type suitable for use on VLOCs and similar ships. Virtually all aspects of these pro- pellers will be considered, including de'sign, performance, and structural strength. The Symposium will, therefore, appeal to a very wide audience. Because of the large number of delegates expected to attend, arrangements have been made to hold the Symposium in the Glaze- brook Hall at the National Physical Labora- tory, Teddington. A final announcement giving 'the program and registration details will be made available in the near future. Non-mem- bers of the RINA may obtain full particulars on application to the Secretary of the RINA, 10, Upper Belgrave Street, London, SW1X. 8BQ. 18 Maritime Reporter/Engineering News
