What if you propose to the owner to convert the ship to use alternate fuel?

flowchart TD
    A[Propose alternate-fuel conversion] --> B{Is conversion major?}
    B -->|Yes| C[Meet new-vessel requirements\nSCV Code reg 2.11.3]
    B -->|No| D[Maintain existing compliance]
    C --> E[Inform Administration before work\nSCV Code reg 2.11.3]
    E --> F[Apply IGF Code\nMSC.391(95)]
    F --> G[Class approval per UR Z25]
    G --> H[DGMA approval under MS Act 2025]
    H --> I[No-more-favourable-treatment\nPSC verification]

• Default position: major conversion must meet new-vessel requirements to the extent reasonable and practicable
• Key instrument: SCV Code reg 2.11.3 — owner must inform Administration before alterations
• Fuel-specific: IGF Code (MSC.391(95)) applies to ships using gases or other low-flashpoint fuels
• India: Merchant Shipping Act 2025, DGMA approval required for major conversion
• Class: IACS UR Z25 governs periodic survey of low-flashpoint fuel installations
• Trap: tacit acceptance applies to SOLAS/MARPOL amendments only, not to conventions or major conversions
• Mechanism: Administration determines applicable requirements; no-more-favourable-treatment applies