Certain compounds - phenols and fatty acids, amongst others - have been identified in the fuel, which have reportedly led to engine problems.
The operational issues generally involve excessive formation of sludge or sediments, linked to the blocking of filters and fuel pumps and eventually damage to engine components.
Thus far, there is no clear explanation as to how these compounds would cause these reported problems.
Identifying and retaining the relevant samples for analysis is critical, Skuld stressed. The bunker supply contract, for example, may provide that the sample retained by the bunker barge is binding for the purposes of determining quality; such contracts also typically have a short deadline for notification of quality disputes failing which the claim may be time barred.
The charterparty may contain its own provisions regarding the samples, which are to be determined in terms of quality.
Given the range of tests that may be necessary (explained further below), those owners/operators stemming bunkers at affected ports should endeavour to ensure that the samples taken during bunkering are sufficient ( - using one litre bottles as a minimum.
It is recommended that the crew closely monitor the sampling procedure and check that the samples from the delivering barge are properly collected. In cases where problems have already occurred, consideration should be given to taking further samples on board the vessel, including of any sludge or sediment which may have developed.
Fuel of this type is typically supplied under the ISO 8217 standards. Skuld said that it understood the most commonly used are the 2005 and 2010 editions, although there are more recent editions issued in 2012 and 2017.
These specifications all provide for routine testing of certain parameters, such as density, water and ash content etc, known as ’Table 2’ tests. However, these standard tests do not identify the presence of the compounds referred to above. Indeed there is no general test for the presence of these compounds, but various methods have been used which can identify unusual chemicals. These include:
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Fourier Transform Infra Red (FTIR). This technique is useful for identifying classes of various chemicals in relatively large amount in the fuel (but does not identify individual chemicals).
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Direct injection gas chromatography-mass spectrometry (GC-MS).
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Headspace GC-MS. (This can identify some volatile chemicals which may not be seen in direct GC-MS).
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SPE polar extraction followed by derivatisation and GC-MS.
Often a combination of these tests provides the best chance of identifying any unusual materials in the fuel. To the extent that such materials are identified, the relevant provisions of the specification are Clause 5 and -in the 2010 and subsequent editions - Annex B
While determining the precise quantity of any unusual compounds is challenging and there is no common expert guidance on what amount (if any) of a given compound is safe, Clause 5 provides a greater degree of protection for the purchaser in this context than the ’Table 2’ tests.
Worryingly however we are now starting to hear that suppliers are in some instances revising supply contracts to eliminate Clause 5, Skuld said. Given the broader requirements of Clause 5 over the particular specifications identified by the tests, this will have the effect of significantly reducing a purchaser's recourse against the supplier because, in simple terms, under the supply contract the supplied fuel will be within the contractual specification (assuming it meets the ‘Table 2’ tests even if it fails the wider Clause 5 requirements.
It is also easy to imagine a situation where a timecharter party includes the Clause 5 requirements as part of the bunker specification clause but where the timecharterer, perhaps unwittingly, purchases fuel where Clause 5 is omitted from the bunker supply contract.
In such a situation and assuming the bunkers were 'off-spec' under the broad Clause 5 requirements, the timecharterer could under the charterparty be held liable for any losses suffered by the owners but without any recourse to the supplier.
We therefore recommend that the purchasers of such bunkers, be they owners or time charterers, check carefully that Clause 5 is included in the supply contract before purchase, Skuld warned.
There are myriad legal and technical issues arising from of the above, which will vary depending on the terms of the relevant charterparty and bunker sale contract, and the jurisdiction regulating any possible tort claims between the physical supplier and the receiving vessel.
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