Steps to Surveying Aluminum Yachts: Aluminum Hull Inspection Tips

When it comes to buying or maintaining an aluminum yacht, knowing how to properly survey the vessel is crucial. Aluminum yachts are popular for their durability and lightweight properties, but they require a specific approach during inspection. I’ve spent years working with yachts in the Ionian Islands, and I want to share practical steps and tips to help you confidently assess an aluminum yacht’s condition.

Why Aluminum Hull Inspection Tips Matter

Aluminum hulls behave differently than fiberglass or steel. They resist corrosion well but can suffer from fatigue, dents, and galvanic corrosion if not properly maintained. Understanding these unique traits helps you spot potential issues early.

For example, aluminum can develop tiny cracks from stress or impact. These cracks might not be obvious at first but can lead to serious problems if ignored. Also, aluminum’s conductivity means it’s vulnerable to galvanic corrosion when in contact with other metals in saltwater.

By focusing on the right inspection points, you can avoid costly repairs and ensure your yacht stays seaworthy for years.

Key Steps in Surveying an Aluminum Yacht

Here’s a step-by-step guide I follow when surveying aluminum yachts. You can use this as a checklist or a starting point for your own inspections.

1. Visual Inspection of the Hull and Superstructure

Start with a thorough visual check of the hull above and below the waterline. Look for:

• Dents, scratches, or gouges in the aluminum surface

• Signs of corrosion, especially around welds and fittings

• Discoloration or white powdery residue (aluminum oxide)

• Areas where paint or protective coatings are peeling or blistering

  
  

Use a bright flashlight to inspect hard-to-see spots. Pay close attention to the keel, rudder, and propeller shaft areas.

Close-up of aluminum yacht hull surface condition

2. Check Welds and Structural Integrity

Welds are critical on aluminum yachts. Poor or cracked welds can compromise the vessel’s strength. Examine all visible weld seams for:

• Cracks or fractures

• Inconsistent weld beads or signs of repair

• Corrosion around weld joints

  
  

If you spot anything suspicious, it’s worth having a professional perform a more detailed non-destructive test like dye penetrant or ultrasonic inspection.

3. Inspect the Anodes and Corrosion Protection Systems

Aluminum yachts rely on sacrificial anodes to prevent galvanic corrosion. Check the condition of these anodes:

• Are they heavily worn or missing?

• Are they properly attached and making good contact with the hull?

• Is there evidence of corrosion around the anode mounting points?

  
  

Replacing anodes regularly is essential to protect your yacht’s aluminum hull.

4. Examine the Interior Hull and Bilge Areas

Don’t forget to look inside the hull if possible. Inspect the bilge and interior surfaces for:

• Signs of water ingress or leaks

• Corrosion or pitting on internal aluminum surfaces

• Condition of insulation and coatings inside the hull

  
  

Water stains or rust-colored marks inside can indicate hidden problems.

5. Test Electrical Systems and Bonding

Aluminum yachts need proper electrical bonding to prevent corrosion. Check:

• The bonding system’s continuity and connections

• Condition of wiring near the hull and through-hull fittings

• Any signs of electrical arcing or damage

  
  

A faulty bonding system can accelerate corrosion and cause electrical hazards.

Tools and Techniques for a Thorough Aluminum Yacht Survey

Having the right tools makes your inspection more effective. Here are some essentials I recommend:

• Flashlight: For detailed visual checks in dark or tight spaces.

• Magnifying glass: To spot small cracks or corrosion spots.

• Moisture meter: To detect water intrusion in the hull or deck.

• Multimeter: To test electrical bonding and continuity.

• Dye penetrant kit: For identifying surface cracks in welds.

• Ultrasonic thickness gauge: To measure hull thickness and detect thinning.

  
  

Using these tools, you can uncover issues that might not be visible to the naked eye.

Why You Should Consider a Professional Aluminum Yacht Survey

While you can do a lot yourself, an expert surveyor brings experience and specialized equipment to the table. A professional surveyor will:

• Perform detailed non-destructive testing on welds and hull thickness

• Assess the yacht’s overall condition and seaworthiness

• Provide a comprehensive report highlighting risks and maintenance needs

  
  

If you’re serious about buying or maintaining an aluminum yacht, investing in a professional aluminum yacht survey is a smart move. It gives you peace of mind and helps you avoid surprises down the line.

Maintaining Your Aluminum Yacht After the Survey

Once you’ve completed the survey and addressed any issues, ongoing maintenance is key. Here are some practical tips:

• Regularly inspect and replace anodes to keep corrosion at bay.

• Wash the hull with fresh water after every saltwater trip to remove salt deposits.

• Touch up paint and protective coatings promptly to prevent corrosion.

• Check welds and fittings annually for signs of fatigue or damage.

• Maintain electrical bonding systems and wiring to avoid corrosion and electrical faults.

  
  

By staying proactive, you’ll extend your yacht’s life and enjoy many safe voyages.

Final Thoughts on Aluminum Hull Inspection Tips

Surveying an aluminum yacht requires attention to detail and understanding of the material’s unique properties. Whether you’re buying a new vessel or maintaining your current one, following these steps will help you make informed decisions.

Remember, a thorough inspection combined with professional advice is the best way to protect your investment. With the right care, your aluminum yacht will serve you well in the beautiful waters of Greece and beyond.

Happy sailing!