The high strength structural steel, such as Grade DH 32, when used as part of the main deck plating, is noted on the vessel's Certificate of Inspection. The information is important because __________.
• High-strength structural steels (e.g., Grade DH 32) and how they differ from mild shipbuilding steel • How welding procedures can change when working with special grades of steel • The purpose of information listed on a vessel’s Certificate of Inspection (COI)
• Ask yourself: Why would the Coast Guard care enough about this specific steel grade to write it on the Certificate of Inspection? Is it more likely for electrical reasons, corrosion reasons, or fabrication (construction/repair) reasons? • Think about which shipyard activities would absolutely need to know the exact steel grade in that area of the ship. • Consider which option would most directly relate to safety during repairs and structural integrity rather than routine electrical or corrosion systems.
• Which choice specifically involves how the steel must be worked on or repaired (rather than how equipment mounted to it must function)? • Which options talk about electrical or cathodic issues that would usually be handled by system design, not by a note on the COI? • Verify which answer best matches something that must be formally documented for surveyors and welders planning future repairs or modifications.
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