New ISO 8217 eyes wider scope for alternative fuels

The 7th edition of ISO 8217, to be published in the second quarter of this year, will outline a broader integration of marine biodiesel blending, delegates heard at the International Bunker Conference (IBC) 2024 in Norway.

Tim Wilson, principal specialist fuels of Lloyds Register's fuel oil bunkering analysis and advisory service (FOBAS), presented on the upcoming iteration of the ISO 8217 marine fuel specification standard, which will be released at IBC 2024. The new edition will incorporate specification standards for a wide range of fatty acid methyl ester (Fame)-based marine biodiesel blends up to B100, 100pc hydrotreated vegetable oil (HVO), as well as synthetic and renewable marine fuels. This will also include additional clauses to cover a wider scope, and briefly touch on biodiesel specifications that do not entirely align with road biodiesel EN-14214 specifications. This follows the emergence of widening price spreads for marine biodiesel blends because of specification differences and the lack of a marine-specific standard for the blends.

The new edition of ISO 8217 is also expected to remove the limit of 7pc Fame when blended with distillate marine fuels such as marine gasoil (MGO) which was in place in the previous ISO 8217:2017. Other changes to distillate marine biodiesel blends include changes to the minimum Cetane Index, oxidation stability alignment to be connected to either ISO 15751 for blends comprising 2pc or more of Fame biodiesel and ISO 12205 for blends comprising a Fame component of under 2pc. Cold-filter plugging point (CFPP) properties will be determined by the vessel's fuel storage tanks' heating capabilities and requirements will be set in place to report the CFPP for distillate marine biodiesel grades, according to the new edition of the marine fuel specification standard.

Wilson said that a minimum kinematic viscosity at 50°C will be in place for various forms of residual bunker fuel oil along with a viscosity control alerting suppliers to inform buyers of the exact viscosity in the supplied fuel. He said they have seen delivered fuel viscosity come in at much lower levels than ordered by the buyers, which was the reasoning behind the viscosity control monitoring requirement.

By Hussein Al-Khalisy