Cargo Discharge & Heating

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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

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Ships Fitted with Framo or Marflex Pumps

Cargo Discharge — Framo / Marflex

1. 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.

   Caution

   The L/D column must only be used for event type DISCHARGING. Do not use it for other event types.

2. 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:

   Item	Value
   Total Generator consumption	4.8 MT
   Calculated Power Pack consumption	1.2 MT

   Report in Metaweave as:

   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.

1. Book all Boiler consumption under Cargo Heating

   All Boiler consumption for Cargo Heating must be reported under the Cargo Heating column.

   Note

   Do not report it under Boiler, even if the Boiler is simultaneously being used for other purposes during Cargo Heating.

2. 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:

   Item	Value
   Total Generator consumption	4.5 MT
   Total Boiler consumption	7.2 MT
   Calculated Power Pack consumption	1.2 MT

   Report in Metaweave as:

   Column	Value
   Generator	3.3 MT
   Cargo Heating	8.4 MT (= 1.2 + 7.2)
   Boiler	0 MT

3. In-Port Cargo Heating

   If Cargo Heating is conducted In Port, report the consolidated consumption of all Diesel / Electric Power Packs and the Boiler under the single Cargo Heating category for the appropriate event and fuel grade, following the notes above.

Framo / Marflex Flowchart

flowchart TD
    A[Start: Cargo Operation\nFramo / Marflex vessel] --> B{Operation type?}

    B --> C[Cargo Discharge]
    B --> D[Cargo Heating]

    C --> C1[Event type = DISCHARGING]
    C1 --> C2[Calculate Power Pack\nconsumption]
    C2 --> C3[Book Power Pack share → L/D column]
    C3 --> C4[Book remainder → Generator column]
    C4 --> C5[CII deduction: FC_electrical via L/D]

    D --> D1{In Port?}
    D1 -- No --> D2[Calculate Power Pack\ncirculation share]
    D2 --> D3[Add Power Pack share\nto Boiler total]
    D3 --> D4[Book combined total\n→ Cargo Heating column]
    D4 --> D5[Book Generator remainder\n→ Generator column\nBoiler = 0 MT]
    D5 --> D6[CII deduction: FC_Boiler\n+ FC_electrical via Cargo Heating]

    D1 -- Yes --> D7[Book all Power Pack\n+ Boiler consumption\n→ Cargo Heating column]
    D7 --> D6

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Ships Fitted with C.O.P. (Steam-Turbine Cargo Pumps)

Cargo Discharge — COP

1. Book entire Boiler consumption under L/D

   Report the fuel consumption of the Boiler used for cargo discharging (via COP) under Events → L/D for the relevant fuel grade.

   Caution

   The entire Boiler consumption during Cargo Discharge must be reported as L/D — not under Boiler or IGS — even if the Boiler is simultaneously being used for Inert Gas (flue gas) generation or domestic use during discharging.

Cargo Heating — COP

Cargo heating is reported only when heating cargo in cargo tanks.

Note

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.

1. Book entire Boiler consumption under Cargo Heating

   Report the entire Boiler consumption under the Cargo Heating column for the relevant fuel grade.

   Note

   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.

2. In-Port Cargo Heating

   If Cargo Heating is conducted In Port, report the entire Boiler consumption under Events → Cargo Heating for the appropriate event and fuel grade.

COP Flowchart

flowchart TD
    A[Start: Cargo Operation\nCOP Steam-Turbine vessel] --> B{Operation type?}

    B --> C[Cargo Discharge]
    B --> D[Cargo Heating]

    C --> C1[Event type = DISCHARGING]
    C1 --> C2{Boiler also used for\nIGS or domestic?}
    C2 -- Yes --> C3[Still book 100% of\nBoiler consumption → L/D]
    C2 -- No --> C3
    C3 --> C4[CII deduction: FC_Boiler via L/D]

    D --> D1{Cargo in Slop tanks?}
    D1 -- No --> D2[Book Boiler consumption\n→ Cargo Heating column]
    D1 -- Yes --> D2
    D2 --> D3{In Port?}
    D3 -- No --> D4[Report under Cargo Heating\nin At-Sea / port event]
    D3 -- Yes --> D5[Report under Events →\nCargo Heating for that event]
    D4 --> D6[CII deduction: FC_Boiler\nvia Cargo Heating]
    D5 --> D6