A: Yes, the official PDF includes mandatory Annex A (Design example for a guyed stack) and informative Annexes B–I.

: Outlines for fabrication, erection, and mandatory maintenance and inspection protocols after the stack begins operation. Significant Updates in the 2021 Edition

While the core scope remains consistent, the 2021 revision includes:

The standard, titled "Steel Stacks," provides minimum requirements for the mechanical and structural design, fabrication, and maintenance of steel stacks used primarily for nonflammable combustion gases. Issued on June 30, 2022, it replaces the 2016 edition and remains active until the next scheduled publication in 2026. Key Technical Sections

A: No. FRP stacks are covered under ASTM standards. STS-1 is exclusively for steel.