Operational experiences of DNV classed Gas Fuelled vessels
Due to a number of factors, amongst others fuel oil price increases, air emission regulations and ’pollution taxes’, the number of vessels using LNG as engine fuel has increased remarkably in the last few years. Many operators of ’gas engine vessels’ have chosen to classify their vessels with Det Norske Veritas, thereby confirming the leading role of DNV in the field of Rule development for gas fuelled vessels. The DNV fleet now includes circa 30 gas engine driven vessels, having approximately 100 gas engines installed, with contracts for another 40-plus vessels signed. With the oldest engines already in operation for more than 10 years, the time seems suitable for an evaluation of experiences with this, after all, relatively young technology and, perhaps, recalibrations of the various applicable regulations. The DNV classified gas engines, both gas only and dual fuel, are installed on board approximately 30 vessels. These vessels can roughly be divided into 3 different groups; ferries and patrol vessels equipped with gas only engines, offshore support vessels operating dual fuel engines on LNG bunkers and LNG tankers operating dual fuel engines on cargo LNG; Besides the fact that these three groups all have different operating profiles, they also use two different types of gas engines produced by four different engine manufacturers, and, last but not least, different sources of LNG. However, all vessels have in common that they have electric propulsion motors, i.e. all engines are driving generators. This paper will address, with the support of damage statistics, the experiences gained so far by the various operators of gas engines, experiences with both the engines themselves as well as their ancillary systems. In addition, it will investigate to which degree the vessels’ operating profiles and subsequently the engines’ load profiles are of importance for the successful operation of gas engines as generator drivers. Finally, this paper will, based upon the experiences inventoried, identify areas where adjustments, or introduction, of regulatory requirements should be considered.
Thomas Dirix
Det Norske Veritas,Norway
国际会议
上海
英文
1-12
2013-05-13（万方平台首次上网日期，不代表论文的发表时间）