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Overview
CII allowance for Cargo Discharging and Cargo Heating is lost if bunker consumption is not reported under the correct column in the Metaweave Events / Used For / Bunker ROB sections. Incorrect attribution directly affects the vessel’s overall CII rating.Regulatory Background
The following deductions from attained CII are defined in MEPC.355(78):| Parameter | What it covers |
|---|---|
| FC_electrical,j | Mass (g) of fuel type j consumed for electrical power production — deductible for discharge pumps on tankers |
| FC_Boiler,j | Mass (g) of fuel type j consumed by the oil-fired boiler — deductible for cargo heating and cargo discharge on tankers |
| FC_others,j | Mass (g) of fuel type j consumed by stand-alone engine-driven cargo pumps during discharge — deductible for tankers |
Ships Fitted with Framo or Marflex Pumps
Cargo Discharge — Framo / Marflex
Book all Power Pack consumption under L/D
Report the consolidated fuel consumption of all Diesel and Electric Power Packs under Events → L/D for the relevant fuel grade.
Remove Power Pack share from the Generator column
Any consumption attributed to Power Packs during cargo discharge must not remain in the Generator column. Move the Power Pack portion to L/D.Example:
Report in Metaweave as:
| Item | Value |
|---|---|
| Total Generator consumption | 4.8 MT |
| Calculated Power Pack consumption | 1.2 MT |
| Column | Value |
|---|---|
| Generator | 3.6 MT |
| L/D | 1.2 MT |
Cargo Heating — Framo / Marflex
Cargo heating is reported only when heating cargo in cargo tanks (using steam coils or deck heaters). It is not reported when heating slops stowed in Slop / ROT tanks.Book all Boiler consumption under Cargo Heating
All Boiler consumption for Cargo Heating must be reported under the Cargo Heating column.
Do not report it under Boiler, even if the Boiler is simultaneously being used for other purposes during Cargo Heating.
Move Power Pack share from Generator and L/D to Cargo Heating
Calculated consumption for Power Packs used for cargo circulation during Cargo Heating must not be included in Generator or L/D. It must be added to Cargo Heating.Example:
Report in Metaweave as:
| Item | Value |
|---|---|
| Total Generator consumption | 4.5 MT |
| Total Boiler consumption | 7.2 MT |
| Calculated Power Pack consumption | 1.2 MT |
| Column | Value |
|---|---|
| Generator | 3.3 MT |
| Cargo Heating | 8.4 MT (= 1.2 + 7.2) |
| Boiler | 0 MT |
Framo / Marflex Flowchart
Ships Fitted with C.O.P. (Steam-Turbine Cargo Pumps)
Cargo Discharge — COP
Cargo Heating — COP
Cargo heating is reported only when heating cargo in cargo tanks.Fuel consumed for heating slops in Slop / ROT tanks must not be reported as Cargo Heating — it must be reported under Boiler. However, if Slop tanks are being used to carry cargo, fuel used for heating those tanks must be reported under Cargo Heating.
Book entire Boiler consumption under Cargo Heating
Report the entire Boiler consumption under the Cargo Heating column for the relevant fuel grade.
All Boiler consumption for Cargo Heating must be reported as Cargo Heating and not under Boiler, even if the Boiler is being used for another purpose during Cargo Heating.