HTHW boiler construction is governed under:

• A. ASME Section I
• B. ASME Section II
• C. ASME Section VIII
• D. ASME Section V

Answer: (A)

High-temperature hot-water (HTHW) boilers are classified as power boilers. That means their construction falls under ASME Section I, which sets the rules for the design, materials, fabrication, inspection, and testing of power boilers and their accessories. Section I is specifically concerned with equipment that operates under pressure to produce steam or hot water at elevated temperatures, ensuring safe operation through rigorous construction standards. The other sections cover different aspects (materials, non-destructive testing, or general pressure vessels not under power boiler rules), so they aren’t the primary governing codes for building HTHW boilers.