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current M.A.N.—B&W production program have been designed with a view toward a high firing pres- sure ratio. In continuous service, the engines with bores from 32 cm to 52 cm operate at firing pressures of up to 145 bar. By means of precision changes not involving extensive redesign, high firing pressures can be attained with mechanical stresses remain- ing within controllable limits. The engine program of M.A.N. (Maschinenf abrik Augsburg- Nurnberg AG) includes five four- stroke engines with bores from 200 to 520 mm, and five two- stroke engines with bores from 520 to 900 mm — three of which are long-stroke versions. The four-stroke engines cover an out- put range from 134 to 1,187 bhp per cylinder, and the two-stroke engines from 1,187 to 3,889 bhp per cylinder. The mean effective pressure of the four-stroke en- gines is 20 bar (25 bar with two- stage supercharging), and that of the two-stroke engines is 13 bar and 14.5 bar for the low- speed types and approximately 15 bar with the two-stage H engines. The maximum cylinder pressure of the medium-speed en- gines is up to 145 bar, and that of the two-stroke engines is 115 bar. Today's engine production pro- gram at M.A.N, thus combines, on a high-power level, proven princi- ples with present and future de- mands. The most important de- For tank washing, oil/water separation, underwater hull cleaning ana high pressure water jetting... Butterworth S stems makes all the difference in the world. Oil/Water separators. Since Arthur B. Butterworth was issued the first patents for tank cleaning machines over 50 years ago, we have concentrated on a few select, specialized systems for the marine industry. In doing this, we have earned a worldwide reputation for top performance, exceptional reliability, and creative application of modern technology. Today we offer the world's finest oil/water separators, underwater hull cleaning services, high pressure water jetting equipment, and, of course, tank cleaning machines of every kind. Since we started, we've seen many companies come and go, but Butterworth Systems continues to provide you with equipment and services that save millions of dollars on fuel costs and ship operations. Tank cleaning machines for crude oil (COW) or water washing. Butterworth Systems offers the widest selection of tank cleaning machines available. (Not surprising, since we started the whole thing!) In all, six different BUTTERWORTH® tank cleaning machines, each with its own unique cleaning capabilities and advantages, so we can provide tailor- made systems for your own tank washing needs. SCAMPR underwater hull cleaning machines. In the past ten years, the periodic maintenance of over 4,500 ships by SCAMP Underwater Hull Cleaning Machines has saved owners and operators almost ^-billion dollars. One telephone call can arrange a SCAMP hull cleaning for your vessel almost anywhere in the world and save you millions of dollars in operating costs by reducing fuel expenditures and improving vessel performance. It is also a preferred way to renew the effectiveness of modern reactivation coatings. Compact BUTTERWORTH® SFC BW separators provide a simple and clean way to meet U.S. Coast GUARD AND Marpol '78 requirements for bilge- water separation. They feature a permanent filter bed composed of specially treated oleophilic material which needs an annual poured-in topping of only about 10% new material. Never a dirty filter cartridge to touch. No filter disposal problems. Less labor intensive. Fully automatic models available. TIQUA-BLASTER R high pressure water jetting equipment. Diesel or electric powered, a 2,000 psi (138 Bars) to 15,000 psi (1035 Bars) jet of salt or fresh water is revolutionizing routine on-board maintenance ... especially rust and scale removal from surfaces to be painted. Delivered by a fail- safe. hand-held gun, this water jet easily cleans condenser and boiler tubes, oil spray from machinery galley grease filters, clogged ports and more. In non-explosive environments, where sparks present no hazard, a crew mem- ber can add a small amount of sand via the ABRAS-I-JECTORR accessory and quickly and easily take a sur- face to the white-metal SA2.5 standard. It's no wonder that long after other names have been forgotten, the Butterworth Systems name will still be synonomous with reliable ship systems. For more information contact your nearest Butterworth Systems office. Butterworth Systems BUTTERWORTH SYSTEMS INC. 224 Park Avenue, R O. Box 352, Florham Park, N.J. 07932 (USA) Telephone: (201)765-1546 Cable: BUTTWORTH NEW YORK Telex: 136434 BUTTERWORTH SYSTEMS (UK) LTD. 123 Beddington Lane Croydon CR9 4NX. (ENGLAND) Telephone: 01-684-4049 Cable: MAROPEDOK CROYDON Telex: 946524 velopment targets for the updated program were: Ability to burn heavy fuel oils up to 3,500 seconds Redwood 1 in the case of four-stroke engines, and up to 6,000 sRl in the case of two-stroke engines; adherence to proven design concepts wherever expedient ; variation in turbo- charger arrangement and selec- tion of optimum speed; type of construction fully developed in terms of production, engineering, and maintenance; and high qual- ity standard. By proven design principles M.A.N, understands that for as many components of different en- gine types as possible, the same design solutions are used, per- mitting the transfer of computed and measured results from trial data and practical experience. The constant demand from the shipowners and shipyards for a smaller engine developing below 1,000 kW (1,341 bhp) and the rising interest in smaller station- ary units for combined power/ heat generation prompted M.A.N, to develop the 20 27 engine. This engine is available as an in-line unit with four to nine cylinders, and as a V engine with 12 to 18 cylinders. The 20 '27 engine is intended mainly for the following appli- cations: as a propulsion engine for smaller vessels; as an auxil- iary engine for power generation aboard ships; for stationary pow- er-generating plants; and for plants combining power genera- tion with waste heat recovery. The 20 27 engine is offered in diesel, spark-ignited gas, and dual- fuel versions. The cylinder rating of the diesel engine is 100 kW (134 bhp) at 1,000 rpm according to the ISO definition. Its mean effective pressure and mean pis- ton speed are 14.15 bar and 9 me- ters per second, respectively. For additional information, Write 63 on Reader Service Card MOTOREN- UND TURBINEN-UNION The latest addition to the die- sel line of West German engine manufacturer Motoren- und Tur- binen-Union is a new 16-cylinder engine in the 396 Series, extend- ing the power range of the Series to 2,400 bhp. MTU's 02 version of the 396 Series has found wide acceptance throughout the world, with some 1,600 engines in V 6, V 8, and V 12 models in service up to mid-1980. Now, based on long operating experience with the 02 version, MTU has introduced the 03 ver- sion of the 396 Series, providing a further increase in perform- ance. Major technical modifica- tions contributing to the in- creased performance are an in- creased mean effective pressure with a concurrent reduction of (continued on page 36) October 15, 1981 Write 3432 on Reader Service Card 35
