Class 2 (2nd Engineer) MEKG 📅 Apr 2025

Exam Question

With reference to the fuel standards ISO 8217-2017 discuss the amendments made as compared to its previous edition. Explain the significance of the following: (16)

(a) Pour point, cloud point and cold filter plugging point.

(b) Cat fines

(d) Dissolved H2S in fuel.

Reference Answer

### Amendments in ISO 8217:2017 vs. Previous Edition
ISO 8217 is the primary international standard specifying the requirements for petroleum fuels for use in marine diesel engines and boilers. The 2017 edition introduced significant amendments to address evolving fuel formulations, environmental regulations, and operational challenges.
1. **Broader Scope for Hydrocarbons**: The standard was updated to officially include hydrocarbons from synthetic or renewable sources, such as Biofuels. This acknowledges the industry's move towards alternative and blended fuels in response to decarbonization goals. The previous editions were limited to hydrocarbons derived solely from petroleum.
2. **Introduction of New Distillate (DF) Grades**: To accommodate biofuels, new distillate grades were introduced:

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