Krupp Mak Manufactures Medium-Speed Diesel Engines For Naval Ship Applications
—Free Literature Available— A medium-speed diesel engine designed for heavy fuel operation and low fuel oil consumption is an ideal basis for engines with the load profile for naval operations.
Such medium-speed engines should be designed for: continuous operation; dependability; excellent economy; heavy fuel operation; and minimum service requirement. Additionally, these engines should be compact, with a simple design and uncomplicated systems.
In turn, engines with these characteristics would be well-suited for: high shock loads; extended low load; high operational safety of both the engine and its systems; preventive maintenance; shock load safety; and low emissions.
Diesel engine manufacturer Krupp Mak, which has more than 100 years' experience in naval equipment, offers a number of medium- speed, four-stroke heavy fuel engines in the output range from 740 to 9,900 kw (1,000-13,500 hp) under the trade name Mak.
For example, Krupp Mak offers the heavy-fuel engines M453C and the M332, both of which boost low fuel consumption. The company reports that both engines feature good ratio of maximum to mean piston pressures, but a moderate, and therefore operational safe values. Additionally, the moderate engine load permits a very favorable compression ratio. The engines run very clean at low loads, partially as the result of high injection energy. Both engines feature clean and simple construction. Through fine tuning and the use of high-grade spheroidal graphite iron casting, both engines feature excellent rigidity and thus low vibration.
The relatively long piston strokes are essential for Mak engines. They permit quiet running of the engine with high mechanical efficiency. The cylinder air exchange is more effective as with a short stroke engine. The engines are built for a low thermal load, in order to be suitable for heavy fuel oil operation. This will provide the highest operational safety at frequently changing loads, which are usual in naval operation. A bonus of the Mak engines' designs is an extremely clean exhaust. The marriage of nitrided cylinder liners and the all-around chromium plating of the piston rings and associated ring grooves result in extremely low wear, and consequently, excellent lube oil consumption. Since the engines are designed for rough operation, an unusually long overall service life is expected for naval operation. Piston rings should be changed after 20,000 hours, valves overhauled at 10,000 hours and pistons and cylinder liners should have a service life approximately equal to the life cycle of the engine itself.
For free literature on the Krupp Mak M332 and M453C diesel engines, C i r c l e 1 0 o n R e a d e r S e r v i c e C a rd