Work is being carried out in drydock on a large sea water inlet chest and the valves: describe the inspection you would carry out as the work starts, and during and after the work?

flowchart TD
    A[As work starts] --> B1[Verify permit-to-work & risk assessment]
    A --> B2[Isolate sea-water systems]
    A --> B3[Inspect gratings, chest internals, valves]
    A --> B4[Check safety equipment, access, lighting]
    B3 --> C[During work]
    C --> D1[Clean gratings, check corrosion/marine growth/damage]
    C --> D2[Examine anodes]
    C --> D3[Strip, grind-in, re-test valves]
    C --> D4[Plug overboard discharges]
    D3 --> E[After work]
    E --> F1[Reassemble valves, test operation]
    E --> F2[Leak test under pressure]
    E --> F3[Refit and secure gratings]
    E --> F4[Update records, report to CE]

• Purpose: drydock is the only chance to inspect sea chests and shipside valves externally and internally
• Key items: gratings, sea-chest internals, anodes, sea-suction valves, overboard-discharge valves, fastenings
• Class requirement: UR Z3 §Z3.2.3 — sea chests and their gratings, sea connections and overboard discharge valves and cocks and their fastenings to the hull or sea chests are to be examined
• Industry guidance: IACS Rec 144 — inspection of ship’s side valves
• SMS: ISM Code §10 — maintenance of the ship and equipment, permit-to-work, risk assessment
• EOOW role: verify permits, monitor work, check tests, document in engine log, report to Chief Engineer
• Safety: plug overboard discharges during hull work so dirty run-off clears the ship’s side