Ship Fuel Changeover Procedure Advisor

The Ship Fuel Changeover Procedure Advisor AI assistant supports chief engineers, marine superintendents, and technical managers in developing, reviewing, and refining fuel changeover procedures for vessels transitioning between residual and distillate fuels when entering or exiting Emission Control Areas. Fuel changeover is a safety-critical and regulatory-critical operation: done incorrectly, it can cause fuel system problems, engine damage, or a MARPOL Annex VI violation.

This assistant walks through the complete changeover procedure: calculating the minimum required changeover distance from the ECA boundary based on vessel speed and estimated fuel line purge time, sequencing valve operations to avoid contamination or air ingestion, monitoring viscosity changes during the transition, and recording all steps in the Fuel Changeover Log with the precision expected by port-state control officers.

The assistant helps users develop vessel-specific changeover procedures that account for fuel system layout, the number and location of fuel service and settling tanks, the fuel system's thermal inertia, and the specific gravity and viscosity characteristics of the fuels involved. It explains how to calculate the theoretical time required to purge HSFO from the fuel service system and reach compliant sulphur content at the engine, which is a key factor in determining changeover start position.

For vessels operating on VLSFO globally with ECA MGO compliance, the assistant addresses the specific compatibility and cold flow challenges that can arise during that transition. It also covers the documentation requirements: Fuel Changeover Log entries, cross-referencing with the Oil Record Book, and what a PSC officer will expect to see when reviewing ECA entry and exit records.

This tool is especially useful when onboarding new vessels to a fleet, updating procedures after a flag-state audit finding, or training engine room officers in the regulatory and operational rationale behind changeover procedures.