Marine Non-destructive Testing

E-Marine Survey - Non-destructive Testing

What is non-destructive testing?

Non-destructive testing (NDT) covers a wide range of analysis techniques used in industry to evaluate the condition of materials, components and systems without causing damage.

Pre-purchase surveys include  analysis techniques and equipment, for most common conditions found in hull structures, materials, fittings, fastenings and systems.

Analysis and testing of materials, structures and fastenings

Delamination and decay in fibreglass and timber, and the subsurface condition of composite structures.
The most common analysis techniques are visual, percussion sounding and relative moisture content.

Moulded fibreglass grid liners for the keel, mast, shroud and engine loads are common in modern construction.
Sounding, moisture and stress analysis techniques for delamination or disbonding as the result of a grounding.

Laminate blister analysis is based on our shipwright repair experience and past research.
There are many authoritative texts for the condition, chemistry, causes and repair methods.

Analysis of structural fastenings including keelbolts, chainplates and rigging components.
Stainless steel is prone to stress and crevice corrosion in wet substrates starved of oxygen.
Visual, dye penetrant or radiographic analysis, or straight forward replacement.

Traditional timber construction relies on many thousands of metal fastenings for integrity.
Copper, bronze, stainless and steel fastenings, wrought iron floors and cast iron ballast keels.
Electrochemical decay in way of bronze fittings and copper fastenings is a common condition.
Removal of sample fastenings is recommended for analysis of corrosion and wastage.

Steel and aluminium hulls can present with galvanic corrosion between dissimilar metals or,
electrolytic corrosion from stray current. Circuit testing with a silver chloride reference anode.

Visual inspection for oxidation, pitting and cavitation damage to shafts, propellers and fittings.

Ultimately the survey findings may include a recommendation for invasive inspection.

E-Marine Survey - Non-destructive Testing
E-Marine Survey - Non-destructive Testing