What are the restrictions on carrying high density cargo?

flowchart TD
    A[High density cargo\n≥ 1,780 kg/m³] --> B{SOLAS XII applies?}
    B -->|Bulk carrier| C[Reg 6: weight distribution\n& max deadweight limits]
    B -->|All ships| D[Reg 8: record restrictions\nin loading booklet]
    C --> E[Comply whenever\n≥ 1,780 kg/m³ carried]
    D --> E
    E --> F[MSC.193(79) precautions\n≤ 0.9 L×B×D per space]
    E --> G[IMSBC: check deck stress\n& stability limits]

• Definition: high density cargo = solid bulk cargo with density ≥ 1,780 kg/m³
• Core restriction: SOLAS XII Reg 6 — distribution of total cargo weight between holds and/or maximum deadweight limits must be complied with whenever cargoes ≥ 1,780 kg/m³ are carried
• Loading booklet: SOLAS XII Reg 8 §3.2 — any such restrictions must be identified and recorded in the ship’s loading booklet
• Precaution: MSC.193(79) — max tonnes in any cargo space ≤ 0.9 × L × B × D when detailed info is unavailable; pay particular attention to weight distribution to avoid excessive hull/structure stress
• Stability: IMSBC 2.1.3.4 — when carried in ’tween-decks or higher spaces, ensure deck area not overstressed and stability not reduced below ship’s minimum acceptable level
• Chief Engineer: verifies density declaration, checks loading instrument, ensures compliance with recorded restrictions