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# Cargo Discharge & Heating

> CII-allowance bunker reporting for tankers — Framo, Marflex, and steam-turbine discharge systems.

<Card title="Download PDF" icon="file-pdf" href="/pdfs/03-Cargo-Discharge-and-Heating.pdf">Open the original PDF guideline</Card>

## 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

<Steps>
  <Step title="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.

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

  <Step title="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 |
  </Step>
</Steps>

### 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.

<Steps>
  <Step title="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.
    </Note>
  </Step>

  <Step title="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                 |
  </Step>

  <Step title="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.
  </Step>
</Steps>

### Framo / Marflex Flowchart

```mermaid theme={"system"}
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
```

***

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

### Cargo Discharge — COP

<Steps>
  <Step title="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.

    <Warning>
      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.
    </Warning>
  </Step>
</Steps>

### 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**.
</Note>

<Steps>
  <Step title="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.
    </Note>
  </Step>

  <Step title="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.
  </Step>
</Steps>

### COP Flowchart

```mermaid theme={"system"}
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
```