As chief engineer, what actions do you take if low insulation is detected in submersible cargo pumps?

flowchart TD
    A[Detect low insulation] --> B{< 1.0 MΩ?}
    B -->|Yes| C[Isolate pump motor]
    B -->|No| D[Monitor]
    C --> E[Megger test each cable]
    E --> F{Water ingress?}
    F -->|Yes| G[Repair/replace cable]
    F -->|No| H[Check motor windings]
    G --> I[Verify >1.0 MΩ]
    H --> I
    I --> J[Update electrical log]
    J --> K[Notify cargo control station]

• Threshold: insulation resistance < 1.0 MΩ for systems > 50 V, < 0.3 MΩ for ≤ 50 V
• IGC Code: submersible pump motors in containment must auto-shutdown on low liquid level and be isolatable for gas-freeing
• Immediate action: isolate pump motor from electrical supply, verify with megger, check for water ingress at cable entry points
• Record: log in electrical maintenance record and Oil Record Book Part I if applicable
• Escalation: notify cargo control station, class surveyor if below statutory threshold, DGMA if persistent