By Capt. Neeraj Bharti, Founder, Master Mariner · Published · 2 min read
Inspection first or clean straight away? When an underwater survey should come first
Paying for an inspection before paying for a clean can feel like paying twice. Sometimes it is unnecessary. Often it is the cheapest decision in the whole job, because it tells you exactly what you are buying.
What an inspection tells you
- Fouling type and extent: slime, weed, barnacles, and where
- A fouling rating, which decides the method and whether the port will allow cleaning
- Coating condition: intact, worn or failing
- Niche areas: how bad the sea chests, thruster tunnels and gratings are
- Propeller condition: fouling, roughness and damage
- Anodes and other findings: wastage, damage, debris, rope around the propeller
When to inspect first
- Unknown condition: long time since the last docking or clean, or after a long idle period
- Heavy fouling suspected: the method and capture requirement depend on it
- Delicate or failing coating: you need to know before anyone touches it
- Port restrictions: some ports need the fouling level before they will approve cleaning
- Budget decisions: a partial clean (flat bottom and propeller only, for example) may be enough
- Biosecurity: a destination country may want evidence of condition
When cleaning straight away is reasonable
- Regular programme: the hull was inspected or cleaned recently and the fouling level is known
- Light fouling expected: short interval since the last clean, good recent photos
- Tight window: the team can film representative areas at the start and adjust the plan
Even then, a good contractor films representative areas before starting, so the report has a true "before" record. See the step-by-step procedure.
Inspection and cleaning in one mobilisation
Often the best approach is both in one visit: inspect, decide scope with the superintendent by video, then clean. That needs good communication with the office and quick decisions, but saves a second mobilisation.
Cleanship
Our hull cleaning starts with a pre-clean assessment of fouling and coating, and we can also carry out stand-alone underwater inspections. See our underwater hull cleaning service, in-water class survey, and the complete guide to ship hull cleaning, or contact us.
Sources & further reading
Frequently asked questions
Is an underwater inspection needed before hull cleaning?
Not always. It is worth doing when the hull's condition is unknown, heavy fouling or coating problems are suspected, the port needs the fouling level, or a partial clean might be enough.
What does a pre-clean hull inspection show?
Fouling type, extent and rating, coating condition, niche areas, propeller condition, anodes and any damage or debris.
Can inspection and cleaning be done in one visit?
Yes. The team inspects, the superintendent decides scope from the video, and cleaning follows in the same mobilisation.
Does the fouling rating affect whether a port allows cleaning?
Yes. Some ports and guidance link the permitted method, and whether capture is required, to the fouling level.
- underwater hull inspection
- hull fouling survey
- rov hull inspection
- diver inspection before cleaning
- pre-clean hull inspection
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