Q: Which standard is typically used for HVAC ductwork and supports?
A: A500 rectangular tubing is very common for ductwork and structural framing.
Category 7: Comparisons & Contrasts
Q: Between A53 Gr B (seamless) and A106 Gr B, are they interchangeable?
A: They are often sourced interchangeably for low/medium pressure ambient temperature applications due to similar mechanicals. However, for code-regulated high-temperature service, A106 is the correct and required specification.
Q: What is the fundamental purpose difference between A106 and A500?
A: A106 is for conveying fluids under pressure. A500 is for carrying structural loads.
Q: How does wall thickness designation differ?
A: A53 and A106 use schedule numbers (e.g., Sch 40, 80) or weight class. A500 uses a minimum wall thickness in inches (or mm) directly.
Q: Which standards are commonly referenced in piping codes like ASME B31.1 or B31.3?
A: ASME B31.1 (Power Piping) and B31.3 (Process Piping) both reference ASTM A53 and A106 for pressure piping. A500 is referenced in structural building codes like AISC and AISI.
