With reference to an oil/water separator, how do you sketch it, describe the flow, explain density and temperature effects, and record oil movements and discharges?

flowchart TD
    A[Bilge pump delivery] --> B[Oily-water separator inlet]
    B --> C[Coalescer plate pack]
    C --> D[Oil globules coalesce]
    D --> E[Oil rises to dome]
    E --> F[Oil collection dome]
    F --> G[Level probes]
    G --> H{Oil level?}
    H -->|Yes| I[Open oil-drain valve]
    H -->|No| J[Continue separation]
    C --> K[Water outlet]
    K --> L[Oil-content monitor]
    L --> M{≤15 ppm?}
    M -->|Yes| N[Overboard via 3-way valve]
    M -->|No| O[Auto-stop + divert to bilge/holding]

• Device sketch: 15 ppm oily-water separator with coalescer plate pack, oil collection dome, level probes, oil-drain valve, oil-content monitor, automatic stopping device
• Flow path: pump → separator inlet → conical/coalescer plates → oil globules coalesce and rise to dome → water exits to overboard or holding tank → oil drained from dome via valve
• Density effect: lower density difference (oil vs water) slows rise velocity → harder separation; heavier oils separate more slowly
• Temperature effect: higher temperature reduces oil viscosity → easier separation; too high can cause emulsification → harder separation
• Recording: Oil Record Book Part I for machinery-space operations (ballasting/cleaning oil fuel tanks, discharge of dirty ballast/cleaning water, collection/disposal of oil residue, discharge of bilge water, bunkering) per MARPOL Annex I Reg 17
• Discharge conditions: only en route, through 15 ppm oil filtering equipment, oil content ≤15 ppm without dilution, oil-content monitor and automatic stopping device operating per MARPOL Annex I Reg 15
• ETO scope: electro-technical officer ensures oil-content monitor and automatic stopping device are functional and calibrated; verifies alarms and interlocks; records in ORB Part I