Which of the following methods is NOT acceptable for repairing a locally thinned area that is below acceptable thickness?

Which of the following methods is NOT acceptable for repairing a locally thinned area that is below acceptable thickness?

• A. Weld build up
• B. Install a butt-welded flush patch
• C. Install a lap-welded fillet weld patch
• D. Install a thick-film coating to arrest the corrosion

Answer: (D)

The method that is not acceptable for repairing a locally thinned area that is below acceptable thickness is the installation of a thick-film coating to arrest the corrosion. This approach may offer temporary surface protection, but it does not restore the structural integrity of the vessel. When dealing with locally thinned areas, the focus should be on methods that physically rebuild the material to meet the required thickness and ensure safety under operating conditions. Weld build-up, butt-welded flush patches, and lap-welded fillet weld patches involve the actual addition of metal, which effectively addresses the issue of reduced thickness. These welding methods are designed to reinforce the vessel and restore it to an acceptable condition, ensuring its safe operation under pressure. In contrast, while a thick-film coating may prevent further corrosion, it does not solve the underlying problem of insufficient material thickness and therefore cannot be relied upon as a sole repair method.

The method that is not acceptable for repairing a locally thinned area that is below acceptable thickness is the installation of a thick-film coating to arrest the corrosion. This approach may offer temporary surface protection, but it does not restore the structural integrity of the vessel.

When dealing with locally thinned areas, the focus should be on methods that physically rebuild the material to meet the required thickness and ensure safety under operating conditions.

Weld build-up, butt-welded flush patches, and lap-welded fillet weld patches involve the actual addition of metal, which effectively addresses the issue of reduced thickness. These welding methods are designed to reinforce the vessel and restore it to an acceptable condition, ensuring its safe operation under pressure. In contrast, while a thick-film coating may prevent further corrosion, it does not solve the underlying problem of insufficient material thickness and therefore cannot be relied upon as a sole repair method.