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PROPULSION UPDATE Upgraded MAN B&W L28/32 Engine Offers Improved Fuel Economy, Reliability And Durability The merits of MAN B&W Hole- by's L28/32 auxiliary engine se- ries—one of the world's most popu- lar heavy fuel-burning genset drives—have been enhanced by some recent significant design mod- ifications. The fuel economy has been substantially improved, and the reliability and durability of the new model promise to be even bet- ter than its market-leading prede- cessor. The upgraded L28/32 is already in service or ordered for a number of prestigious auxiliary power installa- tions. Market response is reflected in an order backlog totaling 125,000 bhp at the Holeby factory as of June 1 this year, with deliveries sched- uled well into the summer of 1990. The upgraded engine retains the basic design of the well-proven 280 mm bore/320 mm stroke series but now exploits constant pressure tur- bocharging in conjunction with the new generation of high efficiency turbochargers. The system gives a simplified exhaust manifold and re- duces charge air renewal work, boosting overall thermal efficiency and yielding a reduction in specific fuel consumption of 4-5 gr/bhph. A major contribution to improved performance and reliability also GH15-15,000 lbs. HYDRAULIC PLANETARY WINCHES • PLANETARY GEARING WITH ALL COMPONENTS RUNNING IN OIL • COMPACT DESIGN • OPTIONAL MOTORS • EQUAL SPEED OR OPTIONAL HIGH SPEED REVERSE ON GH7 & GH15 • AUTOMATIC SAFETY BRAKE, HYDRAULICALLY RELEASED • OPTIONAL FREE SPOOL AVAILABLE ON GH15 • SUPPORTED BY A WORLD-WIDE DISTRIBUTOR NETWORK High efficiency hydraulic motors and computer aided designed planetary gears combine to make the most efficient use of available power. Gearmatic's high speed reverse, available on the GH7 and GH15, allows the operator to lower loads at speeds up to 520 FPM and 708 FPM respectively. P/lCCflR WINCH DIVISIONS LEADERS IN WINCH DESIGN' PHONE: (918) 251-8511 • P.O. BOX 547 • BROKEN ARROW, OK 74013 TELEX: 49:2340 stemmed from redesigning key en- gine components for a maximum fir- ing pressure of up to 150 bar. Pro- duction engines, however, will still be released for operation at the ori- ginal 130 bar rating. The resulting higher safety factor ensures low maintenance demands and ex- tended durability from a design running well within its margins: a desirable feature not shared by some other engine designs, which are required to operate at or near their design limits. Components benefiting from re- design include the cylinder head (still of high strength cast iron but with an improved stud securing ar- rangement to accept higher pres- sures), engine frame, cylinder liner, piston and connecting rod. The crankshaft was also modified and the bearing area increased by ap- proximately 6 percent. The improved combustion cham- ber created by the new cylinder head and piston crown contributed significantly to fuel economy gains. Exhaust valve durability is en- hanced by the higher thermal effi- ciency of the engine which yields valve temperatures some 50 degrees C lower than those of the original design. The new L28/32 design super- sedes the former '28 series' models in the streamlined MAN B&W Ho- leby GenSet program, which also embraces the '23 series' (L23/30 models). The upgraded 28 series is available in 5-, 6-, 7-, 8-, and 9-cylin- der in-line versions to cover an out- put band from 1,190 to 2,570 bhp (875 to 1,890 kw) at 720 r/min for 60 Hz applications, and from 1,255 to 2,690 bhp (925 to 1,980 kw) at 750 r/min for 50 Hz applications. The flexibility of the program is enhanced by MCR and ECR options already familiar on equivalent MAN B&W propulsion engines. The choice of an ECR output (about 80 percent of MCR) yields the mini- mum fuel consumption while retain- ing the capability to switch to MCR mode. Up to 30 percent spare capac- Profile of the upgraded 28/32 engine. ity can thus be integrated at the newbuilding stage, ready for tap- ping to meet higher electricity load demands at any time during the ship's service life. The conversion is simply effected onboard by re- matching the turbocharger and ad- justing the valve gear. Ships already benefiting from the new 28 series include the 3,900-TEU Marchen Maersk, the first of nine advanced containerships for A.P. Moller. The auxiliary power pack- age includes three 8-cylinder 28/32- based generating sets. Among the order backlog are 5-cylinder sets (20 in all) for six Del Monte reefer ves- sels booked from Astilleros Espa- noles. Improved engine design is com- plemented by recent investment in sophisticated flexible manufactur- ing systems at the Holeby factory to promote economic and efficient pro- duction. For free literature giving full in- formation on MAN B&W Holeby's upgraded L28/32 auxiliary engine series, Circle 43 on Reader Service Card MAN B&W Holeby's upgraded L28/32 engines allow for more compact installations. Optim- ization of mounting arrangements—for example, lube oil filtration—has reduced overall dimensions of the gensets. Circle 247 on Reader Service Card OMI Acquires Tanker; Orders Panamax Bulker OMI Corporation, New York, N.Y., a major bulk shipping compa- ny, announced the recent acquisi- tion of the 143,800-dwt tanker So- kolica from a Polish owner and the 21 placement of an order at Hitachi Zosen in Japan for the construction of a Panamax dry bulk carrier of 69,950-dwt, in which it will have a 50 percent interest. OMI joint ven- ture companies now have four ves- sels on order in Japan, aggregating over 500,000 dwt, scheduled for de- livery through 1991. Gearmalic PLANETARY PRODUCTS A REPUTATION BUILT ON: • Advanced Research Development • Proven Quality and Reliability • Dependable Product Support • Precision Manufacturing • Versatility and Range of Models, Line Pulls up to 50,000 lbs. GH5-5,000 lbs. GH7-7,500 lbs GH15
