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A vessel operates inside a regulatory cage made of five overlapping regimes. Each has its own inspectorate, its own scoring system, its own remedy timeline. A finding in one can compound a finding in another. A repeat finding across regimes is the signal that something fundamentally isn’t working.
Regime
Issued by
What it controls
PSC
Port State Control authorities
Right to enter and leave port
SIRE 2.0
OCIMF (oil major vetting)
Eligibility for tanker charter
CDI
Chemical Distribution Institute
Eligibility for chemical-tanker charter
VIR
Charterer / inspector inspections
Per-charter performance
CII
IMO Carbon Intensity Indicator
Annual rating against required intensity
The Compliance Surveillance pipeline reads all five together. Detention risk depends on more than just PSC; commercial-charter eligibility depends on more than just SIRE. The pipeline produces one ranked verdict — what’s most likely to bite, in what regime, and what to do about it.
The most operationally consequential regime. A PSC inspection produces deficiencies and (in severe cases) a detention. Every regime has its own MoU (Paris MoU, Tokyo MoU, Riyadh, AMSA, USCG, Latin American), each with a target factor that drives inspection probability per port call.The pipeline tracks:
Open PSC deficiencies (deficiency code, severity, action taken, ranking)
Detention history (when, where, what was the cause, how long held)
Repeat themes (same deficiency code appearing on multiple inspections)
Recent inspection density at the next port’s regime
Crew / SMS deficiencies (often correlated to fatigue, training gaps)
PSC severity vocabulary normalises to:
Source severity
Internal tier
Detainable / Detention recommended
CRITICAL
Major / Code 17, 30 (action required at next port)
OCIMF’s tanker vetting programme. SIRE 2.0 (the 2023 rewrite) replaced binary deficiency findings with a more nuanced observation severity scale:
SIRE 2.0 severity
Description
Severity 1
Minor — process or documentation gap
Severity 2
Moderate — operational concern
Severity 3
Major — significant operational risk
Severity 4
Critical — vessel may be rejected for charter
The pipeline pulls historical SIRE observations and the most recent inspection record, classifies findings by severity, and tracks operator response status — observations have a maximum response window after which the OCIMF system marks them outstanding.
The chemical-tanker analogue to SIRE. Inspection produces ship and barge inspection reports (SIR / BIR). Same response-window logic; same observation severity tracking.The pipeline pulls the last-CDI details per vessel and tracks the inspection cycle.
Charterer- and owner-led inspections. Variable severity vocabulary, normalised the same way as the defects pipeline. VIR findings often pre-empt SIRE / CDI findings — a charterer’s inspector finds something today that the OCIMF inspector would have found at the next vetting if it weren’t fixed first.
The carbon side. The emissions data pipeline handles the data acquisition; the compliance pipeline tracks the rating trend:
Current attained vs required CII for the year
Year-over-year delta in attained
Projected end-of-year rating band (A / B / C / D / E)
Regulatory consequence: a vessel rated D for 3 consecutive years or E for 1 year requires a SEEMP III update with corrective measures
A CII rating projecting E with 6 months of operating year remaining is a major commercial issue — the vessel may need operational changes (slow-steaming, route modification) or technical changes (engine retrofit) to bring the rating back.
A fleet-wide compliance dashboard composes the per-vessel records:
Vessel Last PSC Findings Detention Last SIRE Sev 3+ Last CDI CII Y-1 CII Y0 VerdictPOSUN Mar 2026 2 minor No Feb 2026 1 N/A C C OKAQUILA Jan 2026 5 mixed No Dec 2025 0 N/A C D WatchOCEAN Apr 2026 8 mixed Yes (3d) Mar 2026 2 N/A D E EscalateNEXUS Feb 2026 1 minor No Jan 2026 0 N/A C C OK…
A reviewer scans the row to spot the structurally exposed vessels: OCEAN here has a recent detention, multiple SIRE Severity 3+ observations, and a CII trajectory dropping from D to E — three regimes pointing in the same direction.
A parallel score covers vetting and charterer exposure:Rcommercial=w1Nsire_open+w2Ncdi_open+w31[CII E projected]+w4Nvir_openA CII rating dropping to E carries a binary indicator weight because the regulatory consequence is binary.
A “training” root cause repeating across the fleet is a different conversation than a “technical” root cause on one vessel. The matrix exists so the response is calibrated to the actual problem.
For the carbon dimension, the analyzer tracks attained CII through the operating year:\text{CII}_\text{attained}(t) = \frac{\sum_{i=1}^{t} \text{CO}_2_i}{\sum_{i=1}^{t} \text{Capacity} \cdot \text{Distance}_i}Compared against the IMO required CII for the year and the boundary lines for A–E ratings. A trajectory that’s tracking the D/E boundary is flagged early so operational changes can intervene before the year closes.
A vessel with a clean SIRE record, a clean CII rating, but a fresh PSC detention is in trouble. A vessel with a clean PSC record but a CII trajectory falling off the cliff is also in trouble — different timeline, different audience. Reading the regimes together produces the only honest answer to “is this vessel commercially and operationally compliant?”
Repeat themes across regimes are the single highest-leverage finding the pipeline produces. A one-off finding can be dismissed; the same finding appearing in PSC and SIRE means the underlying issue is real and structural.
OCIMF SIRE 2.0 portal
CDI — Chemical Distribution Institute portal
