Every fleet has the list. Fewer have the process behind it.
Every DoC holder has a critical equipment list. It sits in the SMS and the planned maintenance system, it was sighted at the last internal audit, and it has probably not changed since the vessel was taken over. Ask how it was derived, or what happened the last time a job on it could not be completed on schedule, and the answers are usually less certain.
That is the ground DryBMS Subject Area 16 covers. Its principle is an inspection programme that determines the condition of critical equipment and systems and verifies, with documentation, that they are fit for service. The expectations behind it are not about whether the list exists. They are about how it was built, who approves a deferral, whether stand-by machinery is ever actually run, and whether anyone compares real performance against what the manufacturer promised. Good ship maintenance lives in those questions.
Here is where compliant fleets drift on each of them, and what the four maturity levels expect.
Where the List Comes From
At Basic, DryBMS expects critical equipment to be identified by a documented risk assessment, HAZID or FMEA, and for the list to be periodically reviewed and amended. On many vessels neither condition is met. The list arrived with the previous manager, mirrors a sister ship of a different design, or was drawn from class rules rather than from the consequences of failure on this hull in this trade.
- a list without a traceable risk assessment or FMEA behind it cannot be defended to an auditor or a charterer
- retrofits and major repairs rarely trigger a review of what is now critical
- equipment that is critical only during specific operations, such as ballast pumps during a high-rate load, is often missed
- a list that has never been amended is not evidence of stability; it is evidence that nobody owns it
The Deferral Decision
The real test of a critical equipment system is not the inspection that goes to plan. It is the inspection that cannot. Basic is explicit: where critical maintenance cannot be completed as scheduled, senior management approval is required, and it is only given after review of a risk assessment. A responsible person ashore must be informed whenever critical equipment is taken out of service, and defects must be reported promptly.
- deferrals approved by the superintendent alone, by email, with no senior management visibility
- a deferral risk assessment that is a generic template rather than specific to the equipment, the voyage and the time
- equipment taken out of service for maintenance without the shore notification the standard requires
- no record of how many critical deferrals are open across the fleet at any one time
A fleet that cannot report its open critical deferrals on demand has a list, not a system.
Stand-by Means Run, Not Just Tested
Basic also requires that stand-by equipment reliability is ensured through maintenance, alarm testing and alternate running, with procedures for regular testing of equipment not in continuous use and for ensuring redundancy during critical operations. The alarm test is routinely done. Alternation is where fleets fall down.
- the second steering pump, stand-by fuel pump and emergency generator that pass every alarm test but are never run in alternation under load
- no procedure defining which operations are critical enough to require both units available: manoeuvring, bunkering, high-rate loading
- stand-by equipment maintained to the same hours-based interval as the duty unit, despite running a fraction of the hours
- a changeover that nobody on the current crew has performed
Intermediate and Advanced: Data and Competence
Intermediate turns the list into working instructions. Each critical item in the PMS carries the spares and tools required, how the maintenance is carried out, a risk assessment and defined approval requirements. It also requires a procedure to test and record performance for all critical equipment, with periodic comparison against the manufacturer’s test data to determine equipment health. Advanced adds competence: designated personnel, including third-party contractors, with the skills to maintain and repair critical equipment, supported by approved technician lists.
- performance data logged faithfully and never compared with the shop-test figures
- work instructions that describe the job but not the approval route
- the approved technician defined as whoever the agent can find in port
- contractor competence for critical equipment assumed from the OEM badge rather than verified
Excellence: From Recording to Forecasting
At Excellence, the reliability and performance of critical equipment and its associated alarms are monitored and analysed, and maintenance is forecast rather than scheduled. DryBMS names the methods: condition-based monitoring, trend and historical data, fleet experience, manufacturer recommendations and predictive tools. Subject Area 14 sets the technical KPIs that make this visible: critical equipment failures, percentage of overdue maintenance, the ratio of planned to unplanned work, and off-hire from breakdown.
- vibration, oil analysis and thermography data gathered on one vessel and applied to the fleet
- alarm history analysed for precursors rather than cleared and forgotten
- the deferral count and the unplanned-maintenance ratio reported to management review alongside incidents
- forecasts that move the dry dock specification before the equipment fails
A critical equipment list proves that someone once decided what mattered. A mature system proves how that decision was made, who can override it and under what conditions, and whether the equipment would actually perform when called on. Discover how the DryBMS framework can turn your critical equipment list into a working assurance process, and subscribe here.
