Seeing the Unseen: The Integration of Infrared Thermography in Marine Surveying




In the world of marine surveying, we often say that a surveyor is only as good as their eyes. But even the most seasoned professional can’t see through a fiberglass hull or detect a loose wire buried deep inside a main distribution panel.

That’s where Infrared Thermography (IRT) comes in. Over the last few years, thermal imaging has transitioned from a high-end luxury to an essential tool in my kit. It allows us to perform Non-Destructive Testing (NDT) by capturing the heat signatures emitted by an object. If there’s a problem, there’s usually a heat signature associated with it.

Here is how we are using thermography today to keep vessels safe, efficient, and seaworthy.

1. Identifying Moisture and Delamination in Hulls

For FRP (fiberglass) boats, moisture is the silent enemy. Traditional moisture meters are great, but they are one data point.  Surveys are most effective when multiple data points can be assembled to make a fulsome assessment of the vessel.  A thermal camera allows the surveyor to scan an entire hull in minutes.

Because water has a higher thermal mass than fiberglass, it retains heat longer. As the sun goes down and the hull cools, areas trapped with moisture will stay "warm" longer than the dry sections. Conversely, during the day, these areas may appear cooler. This allows us to pinpoint:

  • Core Moisture in sandwich-construction decks.

  • Delamination and Voids, where air pockets create distinct thermal breaks.

2. Electrical System Safety (Fire Prevention)

Electrical failures are a leading cause of fires at sea. Salt air and constant vibration are brutal on marine wiring. A "hot spot" on a circuit breaker or a terminal block is often a sign of high resistance caused by corrosion or a loose connection.

During a survey, I use thermography to inspect:

  • Panels and Outlets: Finding unbalanced loads or overheating breakers.

  • Battery Banks: Identifying internal cell failures or poor cable terminations.

  • Inverters and Chargers: Ensuring they are venting heat correctly.

Scanning a panel under load can catch a potential fire hazard months before a fuse ever blows.

3. Mechanical and Engine Diagnostics

Mechanical surveyors have been using temperature sensors for many years in order to assess the condition of engines.

Key areas of focus include:

  • Exhaust Systems: Identifying "dry" spots in water-cooled exhausts that could lead to a melt-through.

  • Bearing Wear: Overheating in propeller shaft bearings or alternator pulleys.

  • Heat Exchangers: Detecting scales or blockages by looking for uneven temperature distributions.

  • Transmission: Checking for uniform heat across the gearbox housing.

4. Tank Levels and Insulation

Ever wondered exactly how much fuel is in a structural tank when the gauge is acting up? Since the liquid in the tank changes temperature at a different rate than the air above it, the "liquid line" becomes clearly visible through a thermal lens. We also use it to check the integrity of refrigerated holds or engine room insulation (lagging) to ensure heat isn't escaping into sensitive areas.

Why It Matters for Owners and Buyers

Thermography doesn't replace the hammer and the moisture meter; it empowers them. It’s an extra layer of "vision" that ensures when a survey is conducted all possible tools are used to provide value to the client.

If you live on Vancouver Island Layline Marine Survey can be your partner in boating safety.  Please visit our website for details - www.laylinemarinesurvey.com




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