Measures, checks et analysis


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Many checking and analysis “tools” are used for naval expert assessment. Some are used on-site and others require resorting to a laboratory.

In any case, it is up to the surveyor to carry out measurements or to recommend the proceedings he sees most fit, bearing in mind that the collected information only makes up a part of the investigations, of which he will have to present an overview.

As an example, a non-exhaustive list of the most common ones:

  • Humidity checks

  • Wall thickness mesurement by ultrasonic on metal hulls
  • Oil check

  • Electric measures

Humidity check of laminates and woods

These are relative, non-invasive measurements carried out using a moisture meter – in our case a Tramex Skipper Plus.

They are applicable to all sorts of materials, but are primarily used to look for hydrolysis phenomena, and are essential to follow up the desiccation of the hull when curing osmosis.

See our “technical expert assessment” page.

Wall thickness mesurement by ultrasonic on metal hulls (steel, aluminium…)

These measurements are performed directly by the expert having recent and regularly calibrated equipment. Ultrasonic measurements are used to determine the residual thickness of the metal hulls. They are required by certain regulations and their periodicity is then imposed. These are specific measures that require surface preparation to be really reliable. They are presented in tabular form or on a hull developed which faciliatates the location of test points and monitoring over time.

See our “technical expert assessment” page.

Oil Checks

The cost is trivial compared to the quantity of information obtained; they have long been used for preventive maintenance to detect machines’ internal anomalies. All sorts of analyses of liquids (petrol, cooling liquid, water, etc…) can be carried out depending on requirements.

Oil checks require preparation and a precise sampling. The samples are then forwarded to a laboratory, which supplies a qualitative and quantitative summary, as well as commentary which is all the more interesting as the history of the oil and machinery can be known, which is not always the case with pleasure boats.

For best results, they should be combined with functional tryouts and a visual examination of the engines. The interpretation of these results combined will enable the surveyor to fully appreciate the general condition of machinery.

See our “technical expert assessment” page.

Electric measures

The increase in electric equipment, the use of different tensions and multiple power sources require complex circuits that need to be checked up regularly. The “isolated” and “continuous” measurements are efficient means, and are largely required by professional rulings and for large scale pleasure sailing. Other measurements –such as current leakages- are used to locate origins of electrolytic or galvanic corrosions, or preventively to control the risks.

See our “technical expert assessment” page.

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