A class survey is one of those events every ship operator knows is coming well in advance, yet many vessels still scramble in the final weeks before it. Proper preparation isn’t just about avoiding embarrassment — it directly affects survey duration, cost, and the likelihood of conditions of class being imposed. Here’s a practical preparation checklist.
Understand Which Survey You’re Actually Facing
Classification societies conduct several distinct survey types, and preparation needs differ meaningfully between them:
- Annual Survey — a general condition check, typically less extensive
- Intermediate Survey — a more detailed inspection at the midpoint of a class cycle, with additional scope depending on vessel age and type
- Special (Renewal) Survey — the most comprehensive survey, conducted every five years, essentially re-certifying the vessel for another full class cycle
- Docking Survey — specifically examining the underwater hull, typically requiring drydocking or an approved in-water survey alternative
- Continuous Machinery Survey (CMS), where applicable — spreading machinery survey items across the class cycle rather than concentrating them all at Special Survey
Confirming exactly which survey scope applies well in advance shapes the entire preparation timeline.
Documentation Preparation
- Confirm all previous survey reports and any outstanding conditions of class or recommendations are on hand and, ideally, already addressed — unresolved items from a previous survey are one of the most common reasons a new survey extends longer than planned.
- Review the vessel’s planned maintenance system (PMS) records for completeness and consistency with what the surveyor will physically observe — discrepancies between paperwork and physical condition are a red flag surveyors specifically look for.
- Gather thickness measurement reports from the most recent relevant survey, particularly important ahead of Special Surveys where extensive hull thickness gauging is typically required.
- Ensure certificates (safety equipment, radio, load line, IOPP, and others relevant to vessel type) are current and readily accessible, not just technically valid but easy to locate during the survey.
Physical Preparation
- Hull cleaning and access preparation, particularly for drydock surveys, ensuring surfaces are properly prepared for the surveyor’s visual and thickness gauging inspection.
- Tank cleaning and gas-freeing for internal tank surveys, completed with adequate lead time and proper safety documentation, given the serious enclosed-space entry risks involved.
- Testing of safety equipment (lifeboats, davits, fire pumps, emergency generators) in advance of the survey, addressing any deficiencies found during this internal pre-check rather than discovering them for the first time during the actual survey.
- Machinery condition verification, particularly for items due for opening/inspection under the survey scope, ensuring maintenance is genuinely current rather than only appearing so on paper.
Crew Preparation
- Brief the crew on survey scope and schedule so relevant department heads (Chief Officer, Chief Engineer) can properly support the surveyor’s access and inspection needs without operational delays.
- Ensure crew are prepared to demonstrate equipment operation where required — surveyors commonly ask for live demonstrations of safety equipment, alarm systems, and emergency procedures, and crew unfamiliarity during these demonstrations is a recurring, avoidable source of survey findings.
- Confirm required certificates and training records for relevant crew (firefighting, enclosed space entry, etc.) are current and available for the surveyor’s review where applicable.
Common Reasons Surveys Take Longer or Result in Conditions of Class
- Poor correlation between PMS records and actual physical condition — indicating either genuine maintenance gaps or, sometimes, inadequate record-keeping discipline that undermines credibility even when actual maintenance was adequate.
- Unresolved conditions of class from previous surveys, compounding scope and surveyor scrutiny.
- Crew unfamiliarity with safety equipment operation during required demonstrations.
- Inadequate advance internal inspection, meaning issues are discovered by the surveyor rather than proactively identified and addressed beforehand.
- Incomplete documentation, causing delays while missing certificates or records are located or requested.
A Practical Pre-Survey Timeline
- 3-6 months before: confirm survey scope and type, review outstanding conditions of class, and schedule any drydocking or major preparation work needed.
- 1-2 months before: conduct an internal pre-survey inspection covering the likely scope, addressing findings proactively.
- 2-4 weeks before: finalize documentation, confirm certificate validity, and brief crew on survey logistics and expected demonstrations.
- Final week: conduct final equipment testing and ensure the vessel’s physical condition matches what the documentation will show.
Survey scope, requirements, and timing vary by classification society, vessel type, and vessel age. Always confirm current survey requirements and scheduling directly with your classification society well in advance of any scheduled survey.