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In-water survey (referred to by various classification societies as IWS, BIS, etc.) is a method of surveying the underwater parts of a ship while it is still afloat instead of having to dry-dock it for examination of these areas as was conventionally done.
For cargo ships, two surveys are required within a period of five years. One of these can be an in-water survey, provided the ship is eligible for it.
- The ship (tanker or bulk carrier) should not be more than 15 years old.
- The bottom of the ship should not be painted black before carrying out the survey.
- Bureau Veritas Classification e-rules on In-water surveys (INWATERSURVEY) in Rules for the classification of steel ships
- Turkish Classification Society – see Bottom Surveys
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