Additional requirements

The DNV classification rules for “Rotating machinery – drivers” don’t include MARPOL Annex VI regulations for engine emissions. Additional rules for emissions apply for class notations Clean, Clean(Design), Clean(TierIII) and Clean(Design, TierIII) are available in DNV-RU SHIP Pt.6 Ch.7 Sec.2. For vessels operating with periodically unmanned machinery space class notifications E0 and EC0 will give additional requirements for auxiliary engines as per DNV-RU SHIP Pt.6 Ch.2 Sec.2.

M/S MERSol has two diesel generator sets and two shaft generators for electrical power supply. The auxiliary engines are of type MAN D 2842 LE 301, with rated power of 532 kW at 1500 rpm. The generators connected to auxiliary engines are Leroy Somer, type LSAM 49.1 M 6, with output of 489 kW. The diesel engines are equipped with duplex fuel oil and lube oil filters, and double fuel oil pipes with alarm sensor as required by the rules. The shaft generators are of type SF400L4(PTO) with rated power 969 kW at 1500 rpm. Shaft generators are connected to the main engines trough the reduction gear boxes.
Each of the shaft generators is capable of supplying power to all services necessary for maintaining the ship in normal operational and habitable conditions. I.e. the requirement for tripping of non-essential consumers doesn’t apply for M/S MERSol. The two shaft generators are normally running parallel only on maneuvering/DP mode, where one of the shaft generators is dedicated to bow thruster. The diesel generator sets are used in harbor and scientific sea modes. There is load shedding function installed, where the second generator set will start automatically when the running generator set reaches 90% load. The diesel generator sets will keep running parallel until the load is reduced below 70%.(Lindenberg-Anlagen GMBH, 2011)