Comprehensive Mid-Voyage Low-Carbon Fuel Transition Documentation System

Vessel IMO Number

Vessel Official Name

Voyage Number/Identifier

Port of Departure

Port of Destination

Current Log Entry Timestamp (UTC)

Chief Engineer Full Name

Officer on Duty Full Name & Rank

Voyage Leg Identifier

Primary Cargo Type on Board

Vessel Gross Tonnage (GT)

Main Engine Manufacturer & Model

Fuel Type BEFORE Transition

Intended Alternative Fuel Type AFTER Transition

Date of Last Bunkering for New Alternative Fuel

Bunkering Port for Alternative Fuel

Fuel Switch Initiation Timestamp (UTC)

Fuel Switch Completion Timestamp (UTC)

Engine Load Immediately BEFORE Switch (%)

Engine Load Immediately AFTER Switch (%)

Main Engine RPM BEFORE Switch

Main Engine RPM AFTER Switch

Fuel Injection Pressure BEFORE Switch (bar)

Fuel Injection Pressure AFTER Switch (bar)

Scavenge Air Pressure BEFORE Switch (bar)

Scavenge Air Pressure AFTER Switch (bar)

Exhaust Gas Temperature BEFORE Switch (°C)

Exhaust Gas Temperature AFTER Switch (°C)

Alternative Fuel Flow Rate After Stabilization (kg/h)

Total Fuel Switch Duration (minutes)

Was the fuel transition completed without engine shutdown or load reduction below 50%?

Describe any engine performance anomalies observed during the transition:

Provide detailed explanation for required shutdown/load reduction and associated safety protocols activated:

Engine Control Mode During Transition

Were all backup fuel systems and emergency power systems operational throughout the transition?

Specify which backup systems were compromised and contingency measures implemented:

Did turbocharger speed fluctuate beyond ±5% of nominal during transition?

Maximum Turbocharger Speed Deviation Observed (%)

Additional Engine Performance Observations or Deviations from Standard Parameters

CO2 Concentration - 15 min BEFORE switch (ppm)

CO2 Concentration - DURING switch peak (ppm)

CO2 Concentration - 30 min AFTER stabilization (ppm)

SOx Concentration BEFORE switch (ppm)

SOx Concentration AFTER switch (ppm)

NOx Concentration BEFORE switch (ppm)

NOx Concentration AFTER switch (ppm)

Particulate Matter (PM) BEFORE switch (mg/m³)

Particulate Matter (PM) AFTER switch (mg/m³)

Does your vessel's alternative fuel system produce measurable methane slip (CH4)?

Methane Slip Concentration AFTER switch (ppm)

Was a physical fuel sample extracted during the transition period?

Fuel Sample ID Number/Seal Number

Fuel Sample Extraction Timestamp (if applicable)

Fuel Sample Extraction Location (Tank/Line)

Is laboratory analysis of the fuel sample required for regulatory compliance?

Designated Laboratory Name & IMO Recognized Organization (RO) Number

Did any emissions parameter exceed normal operational baseline by more than 10% during transition?

Specify which parameter(s), peak values observed, and duration of exceedance:

Was the Continuous Emissions Monitoring System (CEMS) fully operational throughout the transition?

Describe CEMS malfunction, backup monitoring methods used, and corrective actions taken:

Were any emissions alarms or IMO-DCS alerts triggered during the fuel switch?

Document alarm types, timestamps, and resolution procedures:

Additional Emissions-Related Observations or Environmental Notes

Alternative Fuel Storage Tank Pressure Reading (bar)

Alternative Fuel Storage Tank Temperature (°C)

Is the alternative fuel stored at cryogenic temperatures (below -100°C)?

Cryogenic Tank Vacuum Level (mmHg)

Alternative Fuel Tank Level (%)

Has fuel quality been verified through onboard testing (density, viscosity, water content)?

Explain why onboard testing was not possible and what compensatory measures were taken:

Are all fuel system seals, gaskets, and double-wall piping integrity verified leak-free?

Specify location and severity of any leaks detected, immediate actions taken, and system isolation status:

Is the fixed gas detection system operational and showing zero alarms in all fuel handling spaces?

Document alarm locations, gas type detected (CH4, NH3, H2, etc.), concentrations, and response actions:

Is the hazardous area ventilation system running at 100% capacity with confirmed air changes?

Detail ventilation system deficiencies, affected zones, and risk mitigation measures implemented:

Have all fuel system safety valves and pressure relief devices been tested within the last 7 days?

Provide safety valve test dates, results, and schedule for immediate testing if overdue:

Is the fixed fire suppression system (CO2, water mist, dry chemical) fully armed and ready for fuel system spaces?

Describe fire system impairments, alternative firefighting measures, and estimated restoration time:

Has the emergency fuel shut-down (ESD) system been functionally tested within 24 hours prior to transition?

Explain why ESD test was not performed and what alternative safety verification was conducted:

Are all crew members involved in the fuel transition certified and current in alternative fuel handling training?

Identify uncertified personnel, their roles, and how they were excluded from safety-critical tasks:

Is the Material Safety Data Sheet (MSDS) for the alternative fuel readily accessible to all relevant crew?

Specify location where MSDS should be stored and immediate corrective action taken:

Are spill containment and vapor dispersion equipment positioned and ready for immediate deployment?

Detail spill response equipment deficiencies and compensatory measures:

Has the fuel transfer and piping system been properly purged of previous fuel to prevent cross-contamination?

Explain purge procedure deviation and risk assessment for fuel incompatibility:

Are there any outstanding safety observations or non-conformities from the pre-transition safety meeting?

List all open safety items, assigned responsible officers, and risk acceptance authority:

Rate the operational readiness of critical safety systems immediately prior to fuel transition:

Has the Chief Engineer personally verified all data in Sections 1-4 for accuracy and completeness?

Specify which sections require correction and actions taken to verify accurate data:

Has this fuel transition been officially recorded in the vessel's Oil Record Book Part I (Machinery Space Operations) or IGF Code Log?

Explain why official logbook entry was not made and plan for immediate correction:

Is this fuel transition compliant with MARPOL Annex VI Regulation 14 (Sulfur Oxides) and Regulation 18 (Fuel Oil Quality)?

Detail compliance deviation and report to flag state/consultation with classification society:

Has the Ship Energy Efficiency Management Plan (SEEMP) Part I been updated to reflect this alternative fuel usage?

Date when SEEMP update will be completed:

Were there any deviations from the company's approved Fuel Changeover Procedure (FCP) during this transition?

Provide detailed explanation for deviation, risk assessment, and justification for non-standard operation:

Has the company technical department and vessel operations center been notified of the successful fuel transition?

Reason for delayed notification and estimated time of notification:

Is notification to the next port state authority required under local regulations for alternative fuel use?

Provide notification timestamp, authority contacted, and confirmation reference number:

Are all supporting documents (fuel delivery notes, lab certificates, engine parameters printouts) attached to this log?

List missing documents and plan for attachment within 24 hours:

Select all applicable IMO instruments and codes complied with during this transition:

Chief Engineer Additional Comments and Overall Assessment of Fuel Transition Operation

Upload Supporting Documentation (Fuel Delivery Notes, Bunker Sample Certificates, Engine Performance Graphs, Emissions Data Exports, Safety Checklist Photos)

Upload Photographic Evidence (Fuel System Gauges, Engine Control Room Display, Safety System Status Panels)

Chief Engineer Digital Signature - Certifying Accuracy of All Logged Information

Chief Engineer Sign-Off Timestamp (UTC)

Chief Engineer License/Certificate Number

Issuing Authority of Chief Engineer Certificate