Class vs Flag: whose requirement prevails when they differ?

Class vs Flag: whose requirement prevails when they differ?

Class vs Flag: whose requirement prevails when they differ?

In class vs flag conflicts you comply with both sets of requirements and plan execution to the stricter side. Practically this means aligning procedures, tools and documentation with the higher bar so surveyors don’t ask for rework when the vessel moves between ports or administrations. For European operations across the Baltics, Nordics and North Sea (Klaipėda, Riga, Tallinn, Gdańsk/Gdynia, Copenhagen, Bergen, Aberdeen, Rotterdam, Hamburg) we pre-agree which template and witnessing the superintendent wants recognized as the “controlling” one.

How we resolve differences (checklist):

  1. Identify controlling clauses early (quotation stage) and map them to SOLAS and flag circulars.

  2. Confirm whether the class wants witnessing for specific tasks (e.g., davit proof-load, release-gear re-set).

  3. Follow maker procedures where they are stricter than generic guidance.

  4. Use traceable calibration and tool IDs in records; list serials for boats/davits/winches/release gear.

  5. Reference clauses in findings; close minor rectifications on board with photos; open items go to NCR/CAR with follow-up.

  6. Deliver class-ready docs the same day so a surveyor can sign off without extra visits.

  7. Keep a single documentation standard across mixed-class fleets (RINA/DNV/BV/ABS/LR) to avoid rewrite when a ship changes surveyor or port.

When to expect stricter control: after major repairs or modifications; when OEM instructions impose brand-specific steps; when flags issue safety circulars after incidents; when class rules add extra checks for ageing systems (e.g., winch brake verification, NDT on structural items).

Action: At quotation stage send your class template and any flag circulars you rely on. We will map our report one-to-one, arrange witnessing where needed and plan around cargo/pilotage windows to minimize off-hire.

Docs:
— SOLAS Ch. III/20 — operational readiness, maintenance, records
— Flag circulars — administration-specific requirements
— Class service manuals — RINA/DNV/BV/ABS/LR

See:
— Class acceptance & samples
— LSA inspections and davit load testing