Port State Control Inspections: What Gets Ships Detained in 2026

Port State Control is the right of a country to inspect foreign-flagged ships calling at its ports, to verify compliance with international conventions — SOLAS, MARPOL, MLC 2006, and STCW among the main ones — regardless of what the vessel's own flag state has certified. It exists because flag state oversight varies significantly, and PSC is the safety net that catches vessels a flag state may have under-inspected.

Inspections are coordinated through regional regimes — the Paris MOU covering Europe and the North Atlantic, the Tokyo MOU covering Asia-Pacific, and similar regional agreements elsewhere — which share inspection data and target ships with poor track records more frequently. A vessel's inspection history follows it globally; a detention in one region raises the inspection priority everywhere.

Selection is not random. Most regimes use a risk-based targeting system that scores vessels on flag state performance, recognised organisation (classification society) performance, company performance history, vessel age and type, and — critically — the number and severity of deficiencies found in previous inspections. Ships in the highest risk category are targeted for inspection at nearly every port call; low-risk ships with clean records may go inspection-free for extended periods.

This means a vessel's and a company's own history is the single biggest factor in how much scrutiny a specific ship receives — a clean inspection record is not just about avoiding one bad day, it actively reduces how often and how thoroughly the ship gets inspected going forward.

Not every deficiency detains a ship — most result in a note to be corrected within a set period. Detention happens when a deficiency is serious enough that the inspector judges the ship unsafe to sail. Year after year, the categories most likely to trigger detention are consistent: fire safety systems (non-functional fire dampers, missing or expired fire extinguishers, fire doors that don't close properly), life-saving appliances (lifeboat engines that won't start, expired pyrotechnics, davit systems that fail a launch test), and ISM Code non-conformities serious enough to suggest the safety management system is not genuinely functioning, not just poorly documented.

Close behind: MARPOL-related deficiencies (oil record book discrepancies, non-functional oily water separators, evidence of illegal discharge — these carry particular weight because they suggest deliberate non-compliance rather than an oversight), and MLC-related crew welfare issues, including unpaid wages, excessive hours of work and rest violations, and inadequate living conditions. This last category has grown significantly as a detention trigger in recent years — PSC regimes have become notably more willing to detain over crew welfare violations than they were a decade ago.

A typical inspection walks a fairly predictable path: certificate and document review first (class certificates, crew certificates and STCW compliance, oil record book, garbage record book, hours of rest records), followed by a physical walkthrough covering the bridge, engine room, accommodation, and safety equipment. Inspectors commonly ask crew members direct questions — not to catch anyone out, but because a crew member's ability to demonstrate familiarity with safety equipment and emergency procedures is itself part of what is being assessed.

A poorly maintained oil record book or hours-of-rest log is one of the most common sources of trouble specifically because it is entirely within the crew's control day to day — unlike a mechanical failure, a record-keeping deficiency reflects directly on discipline and habit, and inspectors read it that way.

The direct costs are significant on their own: daily detention costs, cargo delay penalties, repair or corrective costs often needed under time pressure, and the port call itself extending well beyond schedule. But the costs that outlast the immediate incident matter more for a career and a company alike. A detention increases the vessel's and the company's risk rating within the targeting system, meaning more frequent and more thorough inspections at every port for a sustained period afterward — a single bad inspection can shadow a ship for years.

For an individual seafarer, a detention connected to a safety management or documentation failure on their watch is not invisible to the industry — companies do talk, and a name associated with a serious detention can follow a career in a small industry more than most crew realise.

The habits that actually prevent detentions are unglamorous and daily, not a pre-inspection scramble. Keep the oil record book and hours-of-rest logs current in real time, not reconstructed from memory before a known inspection — inspectors are experienced at spotting records completed all at once. Know your own safety equipment cold: if asked to demonstrate a fire extinguisher check or explain a muster station assignment, hesitation reads as unfamiliarity even when the underlying knowledge is fine.

Report equipment faults through the proper channel the moment they're noticed rather than letting a known issue sit undocumented — a logged, in-progress repair reads completely differently to an inspector than an undocumented failure discovered during the inspection itself. The gap between those two scenarios is often the gap between a note and a detention.

Companies with consistently clean PSC records share a few practical habits: internal audits that genuinely mirror PSC inspection criteria rather than a paperwork-only ISM review, a maintenance budget that treats safety equipment servicing as non-negotiable rather than the first thing deferred under commercial pressure, and a crew welfare standard — wages paid on time, hours of rest genuinely respected — that holds up under MLC scrutiny because it was never marginal to begin with.

The companies inspectors flag repeatedly tend to share the opposite pattern: safety spending treated as a cost to minimise rather than a baseline, and a document trail built for the inspection rather than reflecting how the ship is actually run day to day. Inspectors who have seen thousands of ships generally know the difference within the first hour on board.