The 2021 revision focuses on refining existing formulas and aligning with modern safety regulations. It includes updated ASTM references and improved methods for calculating and fatigue. While intended for nonflammable gases, it can be adapted for flammable gas applications if modified by a qualified engineer to meet additional pressure and safety codes like ASME B31.3 . How to Access the Standard

: Includes sizing gas passages (height and diameter), calculating draft and heat losses, and managing thermal expansion. Structural Design & Analysis

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Previous editions assumed low-cycle fatigue. The 2021 update explicitly addresses high-cycle fatigue (e.g., stacks subjected to continuous vibration from fans or wind). It includes a new mandatory Appendix on for steel shells in cold climates (below -20°F).

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