“the various analyses have conclusively demonstrated the sediment was predominantly inorganic in nature and was not rust from the vessel’s tanks and/or lines”
“4.6.1 During transportation, storage and/or use the distillate fuel (i.e. Gas Oil) will come into contact with air, which contains oxygen. If the distillate fuel contains unstable components, such as cracked refinery distillate fractions, they can oxidise when in contact with the air (oxygen) and this oxidation in turn produces gums and sediments. If the Gas Oil blend/cargo is unstable the oxidation will continue until all the unstable components present in the Gas Oil have been oxidised, which means the levels of sediment continue to increase over a period of time. 4.6.2 It is known that phenalenes and phenalenones are not present in stable straight run distillate fuels but are present in cracked fuels. Trials have also shown that over a period of time the phenalenes content diminishes whilst the phenalenones content increases. The chemistry of the sediment formation in cracked distillate fuels is complex and is thought to proceed by the following steps:- (i) Phenalenes are oxidised to phenalenones (ii) Phenalenones react with Indoles to form Indolyphenalenes and Indolyphenalenones, which are sediment precursors. (iii) These precursors then react with acids to form sediment.” (i) Phenalenes are oxidised to phenalenones (ii) Phenalenones react with Indoles to form Indolyphenalenes and Indolyphenalenones, which are sediment precursors. (iii) These precursors then react with acids to form sediment.”
“A Gas Oil that was unstable would, in my opinion, be unmarketable for use as a finished product and could not be used for any of the normal end-uses of a Gas Oil for the following reasons:- (i) The unstable Gas Oil would produce sediment over a period of time. The rate of sediment production could not be predicted as it would depend upon how unstable the cargo was, storage conditions, temperature, mixing and the amount of oxygen coming into contact with the fuel. (ii) As the stability testing is only predictive any potential end user of an unstable Gas Oil would not know what the sediment levels would be likely to be after a few days, one week, one month or six months. Therefore the user would not know when the sediment levels would become high enough to cause operational problems in the equipment being powered by the Gas Oil, such as those discussed in 4.2.1.” (i) The unstable Gas Oil would produce sediment over a period of time. The rate of sediment production could not be predicted as it would depend upon how unstable the cargo was, storage conditions, temperature, mixing and the amount of oxygen coming into contact with the fuel. (ii) As the stability testing is only predictive any potential end user of an unstable Gas Oil would not know what the sediment levels would be likely to be after a few days, one week, one month or six months. Therefore the user would not know when the sediment levels would become high enough to cause operational problems in the equipment being powered by the Gas Oil, such as those discussed in 4.2.1.”
“And if the only consequence of the oil’s surmised instability was its effect on sediment, it may still be the case that the true effect of the contract was to make the determination of the sediment at the time of loading… conclusive, to the exclusion of an implied condition as to quality”