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accordingly developed a straight- forward method of protection that forms a low-cost alternative to the non-compulsory extension of the double shell aft. Its solution, built into the trio of crude carriers under construction at Koje Island, is to incorporate flat longitudinal bulk- heads in each bunker tank port and starboard. The resulting outer compartment of each fuel oil tank, accounting for approximately 20 to 30 percent of capacity, is of approx- imately the same width as the dou- ble hull around the cargo section. The 79 to 80 percent of fuel in the inner compartment therefore has the equivalent of double shell pro- tection while the hydrostatically balanced loading (HBL) principle can be used in the outer part to reduce outflow in the event of pen- etration. The arrangements are said to represent just a fraction of $500,000 to $1 million cost associ- ated with double-hulling aft, and the attendant affect on engine room layout and pipe runs. In Germany, Lindenau Werft's proactive approach to tankship design and construction, demon- strated in the Tanker Class 2000 concept, has borne fruit in a suc- cession of contracts over recent years. The Kiel yard's objective has been to devise a vessel type offering operating and build effi- ciency against a backcloth of new environmental and safety legisla- tion, and increasing market expec- tations in the way of performance and quality. The completion of the 32,250-dwt product carrier Seadevil in the lat- ter part of 1996 signified a new highpoint for Lindenau. The ves- sel is not only the biggest built to date by the yard, but is also the largest double hull tanker in the German merchant fleet. Carl Buttner's Seadevil (pictured to the left, diagram on page 41) provides a revenue-earning volume of 38,600-cu-m, whereby the cargo section is bounded by double sides and a double bottom. The double hull configuration is claimed to be four times more resistant to colli- sion damage than single hull con- struction, acknowledged by Germanischer Lloyd through its class notation COLL 3 for all cargo tanks. The German yard says the arrangements will safeguard the cargo section even if the outer shell has been penetrated to a depth of 6.6 ft. (2 m), and that the increased protection against collision dam- age has attracted a reduction in insurance premiums. March, 1997 Seadevil provides the first exam- ple of Lindenau's of athwartship 'volume' bulkheads. Stooled at the base and formed like a tank, pre- senting completely smooth sur- faces to the cargo, the arrange- ments facilitate faster unloading and rapid but effective washing. The design principles embodied in Seadevil, as in preceding new- buildings of 23,500 dwt and 13,100 dwt, are applicable to tankers as small as 1,500 dwt, and up to the 40,000 dwt vessel now possible on Lindenau's widened berth. More than 100 variants are offered, allowing choices such as any ice class, hydraulic or electric deep- well pumps, and stainless steel tanks and propulsion systems. Continuity of high-grade tanker production at Kiel has been ensured through an order from Italy's Emiliana Marittima for a Ritchie sets a new standard in Electronic Compassjechnology. . GPS/LORAN/SATNAV RADAR/CHART PLOTTER AUTOPILOT Easy Interfacing. Ritchie's MagTronic Heading System is setting a new standard for Electronic Compass Technology. That's because the MagTronic Sensor produces a crisp, clean signal that converts directly to digital information with accuracy and repeatability un- matched by other sensors. This sensor can also provide identical heading data for all your on-board navigation instruments. In fact, you can usually connect up to three instruments including your compass display directly to the sensor. That's Easy Interfacing. If your electronics require several different signals all at one time, That's Easy too. All it takes is a MagTronic Interface Enclo- sure and simple slip-in MagTronic Interface Modules. Imagine, no more conflicting heading data. Your LORAN, GPS, SATNAV, CHART/PLOTTER RADAR and AUTOPILOT will all have the same precise heading data and MagTronic's unmatched 1/2-of-one degree accuracy. For more information about Ritchie Electronic Compasses, see your favorite Marine or Electronics Dealer or ask for your FREE Ritchie Catalog.. .it has everything you need to know about the new standard in modern Electronic Compass Technology ...and Ritchie Magnetic Compasses, too. Remember, at Ritchie, Technology is never outdated...it's Standard. | Mi •• | E. S. Ritchie & Sons, Inc. M1 I U f"! I E 243 Oak Street, Pembroke, MA 02359 Tel: (617) 826-5131 • Fax: (617) 826-7336 39 Circle 204 on Reader Service Card
