: Regulates weld joint details, shell out-of-roundness allowances, and alignment straightness limits to prevent local buckling.
The ASME STS-1-2021, titled is a comprehensive standard that provides requirements for the design, fabrication, erection, inspection, and maintenance of steel stacks. "Steel stacks" are defined as those structures where the primary supporting shell is constructed of steel. These stacks are commonly used to release combustion gases or other non-flammable exhaust into the atmosphere at high altitudes to prevent damage to equipment and comply with environmental and safety regulations.
Detailed equations to determine vortex frequency; addition of helical strakes or tuned mass dampers. Asme Sts-1 2021 Pdf
ASME STS-1-2021 completely rewrites the seismic section to harmonize with ASCE 7-16’s Risk-Targeted Maximum Considered Earthquake (MCER) ground motions. Owners in high-seismic zones (e.g., California, Alaska, Japan) must pay close attention to Chapter 8, which introduces new response modification coefficients for stacks lined with brick or castable refractory.
: Systems containing an outer structural steel shell and one or more internal liners. These stacks are commonly used to release combustion
: Standard configurations containing a single steel shell layer, which can be lined or unlined.
: Unlined or lined configurations where one steel shell handles both gas passage and structural loads. Owners in high-seismic zones (e
┌─────────────────────────────────────────────────────────┐ │ ASME STS-1-2021 │ └────────────────────────────┬────────────────────────────┘ │ ┌───────────────────────┼───────────────────────┐ ▼ ▼ ▼ ┌──────────────┐ ┌──────────────┐ ┌──────────────┐ │ Mechanical │ │ Structural │ │ Materials & │ │ Design │ │ Analysis │ │ Protections │ └──────────────┘ └──────────────┘ └──────────────┘ 1. Mechanical Design and Sizing
Mechanical considerations focus heavily on gas flow efficiency, thermal insulation, and draft calculations.
Stacks must handle dead loads, thermal expansion stresses, and live wind or earthquake loads simultaneously. The document lists strict guidelines for computing: