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Riverway Completes Second Drydock For Its Own Repair Division Riverway Shipyard Company of Grafton, 111., recently com- pleted its second in-house dry- dock (shown above) for the re- pair division of the shipyard. This drydock is the fourth built by the shipyard in the past two and one- half years and was built in a rec- ord 86 calendar days. It went into immediate service drydocking two harbor boats. The drydock is 80 feet long by 72 feet wide, with 62 feet between wing walls. The hull is 7 feet deep and has four watertight compart- ments. The wing walls are 18 feet high. Lifting capacity is 1,000 tons. Mechanical equipment includes four Byron Jackson 12-inch deep- well pumps with 10-hp electric motors, and four Beebe 5-ton hand winches. The dock is low- ered by four 8-inch gate valves and raised by four 12-inch gate valves. The drydock is outfitted with two watertight pump rooms, 1- inch pipe handrail, six fir timbers 24-inch by 24-inch by 20 feet, four 1,000-watt floodlights, piping for air, oxygen, and acetylene, 372 feet of protective fender re- inforced with 3-inch I beam, and one landing tower. An additional outfitting in- cludes two deckhouses for inclem- ent weather, one 208-volt trans- former for towboat shore power, and one Miller 750 203-volt power source with six 250/250-ampere twin operator welders. The hull is painted with coal tar epoxy and the wing walls are coated with vinyl paint. With the addition of its second drydock, Riverway Shipyard has added a third shift to its repair division for improved service to its customers. With the new im- provements and additions, River- way is a viable asset to the entire barge industry and is actively seeking business from all barge lines. New Brochure Describes National Crane's Line Of Marine Lifting Systems National Crane of Waverly, Nebr., a subsidiary of Kidde, Inc., offers a 12-page, full-color bro- chure describing its complete line of pedestal-mounted hydraulic marine cranes and equipment. National manufactures hydraulic cranes for shipboard, offshore, dockside, and other marine uses. The National Marine Lifting System provides a wide selection of boom lengths and capacities to job-match customer needs. They are specifically engineered for maximum performance in harsh marine environments. Stronger, lighter booms mean greater lifting capacity. Nation- al's telescopic booms are fabri- cated from four high-strength, low-alloy steel members welded with perpendicular corners. This box-section construction permits the use of thicker top and bottom plates for extra strength. Full marine conditioning is standard on all National cranes, providing longer crane life with less maintenance. All external surfaces are sand blasted, coated with inorganic zinc primer, and painted with a durable chlorinated rubber topcoat. All interior sur- faces and cylinders are carefully primed and painted to help pre- vent corrosion. National telescoping marine cranes have capacities ranging from 6,000 to 30,000 pounds. For a free copy of the new National Crane brochure, Write 34 on Reader Service Card ENVIROVAC 1260 Turret Drive, Rockford, Illinois 61111. Toll free (800) 435-6951. ENVIROVAC Vacuum Sewage Collection and Holding Systems. The Quality Leader in Marine Sewage Units. You'll find ENVIROVAC on Coast Guard and Navy ships. On big and small commercial vessels. And on hundreds of other marine installations the world over. The key to the success of the ENVIROVAC System is its use of air instead of water for the trans- portation of sewage. In quality comparisons, the superiority of the ENVIROVAC Vacuum System is readily seen. • ENVIROVAC systems use less water. Only 3 pints of water per flush, or about 2 gallons per crew member per day. • ENVIROVAC reduces holding requirements. The vacuum toilet allows the vacuum collection/ holding tank to be up to 90% smaller than equivalent gravity holding tanks. • ENVIROVAC systems are easy to operate. Unlike treatment plants, the ENVIROVAC system does not require the addition of special chemicals, or the testing of the effluent. No special operating skills or specially trained personnel are required. • ENVIROVAC systems have vitreous china toilets and all wetted parts that are made of non- corrosive materials. • ENVIROVAC systems are easy to install. Because the vacuum toilet can discharge horizontally or vertically, total freedom of placement of the toilets and system com- ponents is possible. Piping can be run around and under bulkheads and decks. • ENVIROVAC systems are U.S. Coast Guard approved. U.S.C.G. Certificate No. 159.15/1016/1/111. Get the quality difference story on ENVIROVAC Vacuum Sewage Systems, today! July 15, 1981 Write 161 on Reader Service Card 27
