Page 37: of Maritime Reporter Magazine (November 15, 1981)

that time some shipowners found it advantageous to use interme- diate fuels (IFO) on their auxil- iary engines.

Since then the number of en- gines equipped for IFO operation has increased every year, and at the present time about 80 percent of Bergen's annual engine pro- duction is sold for IFO opera- tion. There are today approxi- mately 320 Bergen Diesel engines, totaling 2,700 cylinder units, com- missioned for IFO operation.

The majority of the 210 gen- erating engines and a fairly large number of the propulsion engines which are in operation worldwide have to accept the wide variety of fuel qualities available.

Experience has shown that, pro- vided Bergen's recommendations for fuel treatment, engine tem- peratures and load levels are met, overhaul times and wear figures generally did not alter signifi- cantly compared to marine diesel fuel operation.

Representatives of B&W Diesel,

Inc. presented a paper on "The

Low-Speed Diesel and the Future

Energy Scenario." The authors spoke of the current B&W Diesel engine program which is based on the all-fabricated design which was introduced with their K-GF engines in 1973. Because of the oil crisis in 1973 and the subse- quent demand for increased pro- pulsion efficiency, B&W decided to develop a slower running ver- sion of this series.

Due to the uniflow scavenging system of the B&W engine, the slower turning of the propeller could be obtained for the same output by increasing the stroke of the engine.

With the introduction of con- stant-pressure turbocharging in 1978 and the improved turbo- charging efficiency, the exhaust- valve timing was modified such that, at the same maximum cyl- inder pressure and at the same mean indicated pressure, a more favorable cylinder process was obtained. An increase in thermal efficiency and a lower thermal load was obtained.

This led B&W to the next log- ical step, which was that of fur- ther utilizing the built-in power reserve by increasing the mean effective pressure by 12 percent and the speed by three percent.

At the same time, the maximum cylinder pressure was increased by about five percent.

B&W two-stroke engines have in principle been designed to burn all commercial grades of heavy fuel, limited by only a few guid- ing parameters, mainly related to the handling of the fuel oils.

B&W has systematically inves- tigated for the past three years the effect of such so-called future fuels on a test engine, a two- stroke crosshead uniflow-scav- enged engine and in fact, found indication that such fuels will not cause appreciable difficulties.

Hugo Fiedler, Krupp MaK Mas- chinenbau GmbH, spoke on the

November 15, 1981 "Prospects of Medium Speed

Four-Stroke Diesel Engines in

View of Future Fuel Problems."

This paper reports on investiga- tions by Krupp MaK in the low- quality fuel field. Prospects for lowering of fuel consumption and possibilities of maintaining low maintenance costs in spite of in- creasing difficulties are discussed.

The general feeling has been that high engine speed might re- sult in difficulties in burning heavier and less combustible fuel components on account of less time for combustion. Consequent- ly, Krupp MaK looked for various fuels representing future param- eters as close as possible and in- vestigated the influences on com- bustion and thermodynamics, de- posits on the combustion chamber and neighboring area as well as on the general engine perform-

Hugo Fiedler

Krupp MaK Diesel

Mampaey Makes Your Life Easier!

Product Dependability, Priced to Your Advantage;

Quick Shipment.

Inquiries Answered Immediately. (

A-i. .AL msF^) MAMPAEY J

MOORING, TOWING AND CHAIN HANDLING EQUIPMENT

MAMPAEY MARINE ENGINEERING B.V.

P.O. Box 667 - 3300 AR Dordrecht - Holland

Tel. 078-13 53 99 - Telex 29436 MAMPY NL

Represented in the U.SA by °BLUE WATER

MARINE SUPPLY, INC 1000 Broadway at Channelside • P.O. Box 5457

Houston,Texas 77012 • (713) 928-5951 • Telex: 775-183

New Low Profile Double 100-ton Quick Release

Mooring Hook with Explosion-Proof Capstan.

Write 137 on Reader Service Card

MARINE SALES

REPRESENTING

Rubber Sleeve or Flange Bearings

Stuffing Boxes and Keel Coolers

Heavy Duty Fendering

WESTERN BRANCH METALS

Armco Stainless Shafting Systems

Machining — Propeller Nuts

ENVIROVAC INC.

Custom and Pre-engineered

Vacuum Sewage Collection Systems

Uses 3 pint flush toilet

DAMAN INDUSTRIES

Ceramaloy Coatings

Propeller Shaft Liners

Dredge Pump Sleeves and Shafts

KAHLENBERG BROS.

Air Horns — S/S Propellers

P.O. Box 33, Glenhead, N.Y. 11545 516-676-3738

Skilled Labor

Anywhere—

Anytime • PIPEFITTERS • FITTERS • ELECTRICIANS • WELDERS • MACHINISTS • RIGGERS

Cisco has employed over 3000 1st Class mechanics in more than 20 marine facilities nationwide. Cisco services are ideal in any labor intensive project that requires trade skills.

OFFICES:

JACKSONVILLE, FL

NEW ORLEANS, LA

NORFOLK, VA

HOUSTON, TX

For More Information. Call Chris at Consolidated

Industrial Skills Corporation, 1528 E. Adams St.,

Jacksonville, FL 32202 904-354-1868.

Write 385 on Reader Service Card Write 389 on Reader Service Card 39