Aircrafts flying around the world will be fueled at different airports in different countries which means that international fuel specifications for sustainable aviation fuels (SAF) is a necessity.
It’s a matter of ensuring flight safety and minimizing risk of mishandling, but it is also necessary to avoid the need for implementing a varied mix of fuel delivering systems at high cost. Finally, the specifications ensure that today’s engines or aircrafts does not have to be redesigned to run on SAF.
The standard regulating the technical certification of SAF is ASTM D7566 that specifies which technologies and methods can be used when producing on spec SAF. Once produced the SAF can then be blended up to a maximum certified blending limit and be certified to ASTM D1655 which is regarded as conventional Jet A or Jet A1 kerosene.
Several routes lead to SAF certification
At present, the focus is on SAF as a drop-in replacement to conventional jet fuel. ASTM standards do not allow SAF to be used neat today and use is mostly limited to a 50% blend, with a maximum of 10% in some cases.
There are currently seven approved technology pathways to produce drop-in SAF with the following blending limits:
Co-processing is another option for decarbonizing and meeting the criteria for the Standard Specification for Aviation Turbine Fuels (D1655). Co-processing involves the simultaneous processing of fossil and renewable feedstocks. It allows you to convert renewable feedstocks into drop-in, ultra-low sulfur bio jet fuel at economically competitive prices as you can use existing refining, transport, and storage facilities.
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