Abstract
Stork-Werkspoor Diesel B.V., Amsterdam completed a 6 cylinder in-line prototype of new medium speed diesel engine TM-620 and started its test-run in November 1975. The initial engine performance has already reached 1, 700 BHP/cylinder rating level at speed 428 r.p.m., BMEP 18 Kg/cm2on the prototype engine against 2, 000 BHP/cylinder of potential future ratings.
The new TM-620 engine design was based on their experience gained from existing TM-410 engine in principle, 380 sets of which have been sold and 250 sets of which are in service.
The TM-620 engine is virtually a scale-up of TM-410, in order to obtain the optimal engine range and the maximum sales volume.
In order to obtain good reliability and low maintenance cost including oil consumption for the use of heavy fuel as well as reasonable manufacturing cost, a frame design of both engine types is consisting of two heavy iron castings with sufficient rigidity, a U-shape bedplate and cylinder block, connected by means of two rows of tie-rods and careful cooling system and double wall construction or“Strong back”design are adopted to avoid increase of thermal stresses in combustion system.
The manufacturer is expecting that the new large medium speed engine TM-620 can offer more economical propulsion installation by well meshing link with TM-410 for all ship types.
