How to Avoid Ship Detention —
A Practical Guide for Ship Owners and Superintendents

A ship detention is one of the most disruptive and expensive events in ship management. Port dues accumulating while the vessel sits idle, re-inspection fees, class surveyor call-outs, cargo claims, crew overtime, and the lasting damage to your PSC record and RightShip rating — the total cost of a single detention routinely runs into tens of thousands of dollars. And almost every detention I have seen in my career was preventable.

The findings that lead to detention are not surprises. They are the same categories, year after year — fire safety, lifesaving appliances, ISM, certificates. PSCOs do not invent new ways to detain vessels. They walk through the same checklist with the same priorities. The vessels that get detained are the ones whose management did not take that checklist seriously before arrival.

What a Detention Actually Costs

Before getting into prevention, it is worth being clear about what a detention costs — because many owners underestimate it until they experience one directly.

The cost of a proper PSC preparation process — the time, the systems, the follow-up — is a fraction of the cost of a single detention. This is not a compliance argument. It is a commercial one.

What Actually Triggers a Detention

PSCOs use professional judgment when deciding to detain a vessel. There is no automatic threshold — no fixed number of deficiencies that triggers detention. What matters is the PSCO's assessment of whether the vessel is safe to proceed to sea. That assessment is shaped by a combination of factors.

A single detainable deficiency

Some deficiencies are severe enough on their own to warrant detention. These are findings that relate directly to safety of life at sea — an inoperable lifeboat, a fire detection system that does not function, an ISM breakdown where the crew clearly have no functioning safety management system, or a critical certificate that has lapsed. One finding of this type is sufficient.

Accumulation of deficiencies

Multiple deficiencies, even individually minor ones, paint a picture. A PSCO who finds deficiencies in fire safety, LSA, and certificates in the same inspection is not looking at three isolated problems. He is looking at a vessel where maintenance and management are not functioning. The accumulation tells a story, and that story can lead to detention even where no single finding is severe enough on its own.

Repeat deficiencies

If the same item was cited in your last PSC inspection and appears again in this one, the PSCO treats it as evidence that your safety management system is not correcting problems. This is a serious indicator — it suggests the root cause was never addressed, only the surface symptom. Repeat findings escalate an inspection significantly.

The Master's response

PSCOs assess how the Master handles the inspection. A Master who is prepared — who can produce records without delay, who knows the status of every open deficiency from the last inspection, who briefs the PSCO professionally — changes the character of the inspection. A Master who is defensive, who cannot find records, or who appears unaware of known deficiencies on his own vessel sends a very different signal.

High-Risk Situations That Increase Detention Probability

Not all port calls carry equal detention risk. Understanding when your vessel is at elevated risk allows you to concentrate preparation effort where it matters most.

• Vessels with a recent detention — a prior detention raises your vessel's risk score in THETIS and APCIS. PSCOs in subsequent ports will inspect with greater scrutiny and lower tolerance for deficiencies
• Vessels with a poor PSC history — multiple deficiencies across recent inspections, even without detention, raise your targeting probability. High-risk vessels are selected for inspection at higher rates
• Older vessels — Paris MOU and Tokyo MOU apply age-based risk factors. Vessels over 12 years are inspected more frequently and with greater scrutiny
• Black or grey list flag states — a vessel flagged to a state on the Paris MOU or Tokyo MOU grey or black list carries a higher base risk score regardless of its individual record
• First port call after a long voyage — PSCOs know that maintenance sometimes slips during extended voyages. First-port-of-call inspections after a trans-ocean passage are common
• Concentrated Inspection Campaigns (CIC) — Paris MOU and Tokyo MOU run annual CIC campaigns targeting a specific area of compliance. During a CIC, every vessel entering the region is checked against that year's theme. Knowing the CIC focus in advance allows you to prepare specifically for it
• Port calls following a casualty or incident — if your vessel has been involved in a reported incident, expect heightened scrutiny at the next port

The Five Categories That Cause Most Detentions

Detention data from Paris MOU, Tokyo MOU, and Indian Ocean MOU consistently shows the same categories at the top of the list. Preventing detention means preventing deficiencies in these five areas above all others.

1. Fire Safety

Fire safety is the single most cited deficiency category globally. PSCOs test fire equipment physically — they do not just look at maintenance records. A CO2 cylinder where the pilot weight does not match the nameplate, a fire damper that seizes when the handle is pulled, a fire pump that cannot reach required pressure — these are detention-level findings. Walk through every fire safety item physically before every port call in a high-risk MOU region.

2. Lifesaving Appliances

LSA deficiencies are the fastest route to detention. An expired EPIRB battery, an overdue liferaft hydrostatic release, a lifeboat on-load release mechanism that has not been serviced per the manufacturer's schedule — any one of these can contribute to a detention finding. The reason they keep occurring is that expiry dates are easy to miss during busy operations. A single spreadsheet tracking every LSA item and its expiry date, reviewed monthly, eliminates this category almost entirely.

3. ISM and Safety Management

ISM findings change the character of an inspection. Monthly drills not conducted or not recorded properly, a muster list not updated after the last crew change, crew who cannot describe their emergency duties — these findings tell the PSCO the safety management system is not functioning. And when the safety management system is not functioning, he looks at everything else differently.

4. Certificates and Documentation

Certificate deficiencies are entirely preventable. An expired SMC, a crew certificate that does not match the vessel type, a class survey status more than seven days old — all of these are avoidable with basic calendar management. Yet they appear in detention records every year. Pull every statutory certificate and every crew CoC before every inspection. Check expiry dates. Check endorsements.

5. MLC Working and Living Conditions

MLC enforcement has increased significantly across all major MOU regions. Rest hour records with alterations, seafarer employment agreements not on board for recently joined crew, complaint procedures not posted in accommodation, potable water not tested after bunkering — these are the areas PSCOs now check as standard. MLC used to be the domain of flag state audits. It is now a PSC priority in every major port.

The Preparation Process That Actually Works

Most companies have a pre-arrival checklist. Most companies also still get detained. The checklist is not the problem — the verification process is. Sending a checklist to the vessel and receiving "all in order" back is not preparation. It is the appearance of preparation.

The process that works is built on verification, not communication. The superintendent requests physical evidence — photographs, service certificates, signed records — before every high-risk port call. The vessel knows that "all in order" will not be accepted without evidence to back it up. This changes behaviour on board.

1. Start with the last PSC deficiency report — every item cited must be physically rectified and evidenced. This is the first thing the next PSCO will check. If items from the last inspection are still open, you are starting the inspection in deficit
2. Request LSA expiry evidence — EPIRB battery expiry, liferaft service certificates, lifeboat on-load release service record, falls and wire replacement records. If anything expires within 90 days, arrange service immediately
3. Request fire equipment evidence — CO2 pilot cylinder weight photograph, fire pump pressure test log entry, fire damper operational check record
4. Pull all certificates — every statutory certificate and every crew CoC. Check expiry dates and endorsements. Do not rely on the vessel's assurance that certificates are valid — check them yourself
5. Review drill records — confirm monthly fire and abandon ship drills are recorded with all crew names, and that they were conducted at the required intervals, not just logged
6. Review rest hour records — last three months, looking for patterns and alterations. A systematic violation pattern or altered records will escalate an inspection immediately
7. Brief the Master — the Master should know the status of every open deficiency from the last inspection, be prepared to produce records promptly, and know how to handle the inspection professionally

If You Are Already Detained — What to Do

If your vessel has been detained, the priority is to get it released as quickly and cleanly as possible — and to start the rating recovery process immediately.

• Rectify every deficiency physically — not on paper, not with a plan to rectify. The PSCO or his delegate will verify physical rectification before releasing the vessel. Evidence must be available
• Do not dispute findings without merit — a frivolous dispute wastes time, antagonises the PSCO, and does not change the outcome. If a finding is wrong, dispute it professionally with evidence. If it is correct, fix it
• Document everything — photographs, service records, supplier invoices. Everything used to demonstrate rectification should be filed carefully for the re-inspection and for future reference
• Notify RightShip proactively if applicable — if your vessel is on the RightShip platform, a proactive update showing the detention has been resolved with strong corrective actions is better than letting the data appear without context
• Conduct a root cause analysis internally — not for RightShip, but for your own management system. A detention that is not analysed and learned from will happen again
• Update your preparation process — whatever failed in the preparation process that allowed the detention to occur needs to be identified and fixed before the vessel's next port call