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Abstract. The paper gives a summary of the latest development of high-powered diesel engines to units up to 25,000 BHP and of results with these engines installed in large tankers.
Information is also given concerning machinery installations for tankers between 50,000 and 100,000 t.d.w. and the question of necessary auxiliary machinery for running of the main engine - cargo heating - tank cleaning - cargo pumping, and the remaining requirements of the vessel are being dealt with.
Résumé. Cette communication présente une vue d'ensemble sur le développement le plus récent des moteurs diesel à grande puissance d'une part, comprenant des unités pouvant aller jusqu'à 25.000 CVE, et sur les résultats obtenus avec ces moteurs installés sur de gros pétroliers d'autre part.
De plus, des précisions concernant l'armement des pétroliers entre 50.000 et 100.000 dwt sont fournies. Enfin, la question des appareils auxiliaires nécessaires à la marche du moteur principal, au réchauffage de la cargaison d'huile, au nettoyage des citernes, au déchargement de la cargaison et l'équipement du navire en général sont examinés.
Introduction The last two decades have seen a very rapid development in shipping towards higher speeds and ever increasing size of ships.
The most spectacular development has been in the tanker trade where not so many years ago capacities were ranging between 13,000 to 18,000 TDW requiring 4,600 to 7,000 BHP.
To-day tankers of 30,000 to 80,000 tons are in the majority in the building programmes, and even a few tankers of 100,000 to 130,000 TDW are afloat.
The incentive to this development has of course been the lower cost of transportation caused by the smaller BHP/DW ratio by constant speed and in- * Hansen, Soeren, Denmark, Engineer, Chief Engineer, Assistant Director, AÍS Burrneister & Wain's Maskin- og Skibsbyggeri, Copenhagen. creasing DW and by a saving in wages for the crew which are also smaller on a DW basis.
This trend in shipping has provided a challenge to the diesel engine industry in competition with the steam turbine plant to make diesel engine plants available for the power required, and the successful result of this challenge has further accelerated the development towards bigger tankers.
Thus there are to-day several diesel powered tankers of more than 50,000 TDW in service, several 80,000 TDW diesel tankers are on order of which some will be delivered in 1963. Furthermore 100,000 DTW diesel tankers are on order and diesel tankers of even larger DW are likely to be ordered in the near future.
Of these 80,000 and 100,000 TDW tankers 5 will be powered by 10 or 12 cylinder B&W engines with a continuous service output of 21,000 and 25,200 BHP each at 110 r.p.m.
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