Guide for Measures to Cope with Degraded Marine Heavy (1996) - ClassNk [1996, PDF]

Guide for Measures to Cope with Degraded Marine Heavy (1996)

Year: 1996
Language: english
Author: ClassNk
Publisher: ClassNK
Format: PDF
Quality: OCR with errors
Pages count: 90
Description: A ship’s safety, seaworthiness and its ability to make regular sailings greatly depend on the
reliability of its main propulsion machinery. When we look at recent damage statistics of
Nippon Kaiji Kyokai (herein after the "Society” ) on failures of diesel engines that constitute the
majority of main engines of ships, serious machinery damage assumed to be caused by poor And
unstable properties of heavy fuel oil has been progressively increasing. This is considered to be
ascribable to the circulation of heavy fuel oil containing the detrimental elements and the
emergence of new detrimental elements.
As the only international code to control the qualities and properties of marine fuel oils, ISO
8217- has been used customary. However, there are many negative views among shipping
concerns regarding die effectiveness of such a code in assuring the reliability of diesel engines
through the use of the heavy fuel oil that meets the requirements of this code. What is more,
rule-making work is underway to establish another code for high-density fuel oil (1,010 kg/m*
at 15*, embodying stricter requirements than the existing code. Became heavy fuel oil tends to
contain large amounts of elements that degrade fuel oil qualities as its density becomes higher,
there are possibilities that the properties of heavy fuel oil will further deteriorate after die new
code comes into force. Under such circumstances, views have emerged, particularly among
those users of heavy fuel oil, stressing the need to control specific properties of fuel oil
considered to be related to abnormalities in machinery, in addition to complying with the
existing ISO Code.
We also have reports of abnormalities that demand we improve the stability during fuel oil
storage and the stability of blended fuel oils on die basis of our experience, through which we
have learned that die properties of fuel oil sometimes change unexpectedly during shipboard
storage towards the direction in which the reliability of a ship’s engine plant is degraded.
Furthermore, information on bunkering for ships under operation shows it is not rare for bunker
fuel oils outside the requested specification to be supplied on the basis of historical bunker trade
practice and somewhat vague commercial habits. Ocean-going ships, in particular, have to take
on bunker fuel throughout the world on account of their operational characteristics, and place,
time and suppliers can only be specified shortly before bunkering. Due to die fact that valid
unified global trade procedures for bunkering have not been established yet, it is said that there
are frequent disputes over die quantities and the properties of honker fuel oil between ships and
suppliers.

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