What is ASME STS-1-2006 and Why is it Important for Steel Stacks?
ASME STS-1-2006 is a standard published by the American Society of Mechanical Engineers (ASME) that covers the mechanical and structural design, material selection, linings, coatings, and inspection and maintenance of steel stacks. Steel stacks are vertical structures that are used to vent exhaust gases from industrial processes, such as power plants, refineries, chemical plants, and incinerators.
The purpose of ASME STS-1-2006 is to provide minimum requirements for the safe and reliable design and construction of steel stacks, as well as to ensure their compatibility with environmental regulations and public safety. The standard also provides guidance on how to address various factors that affect the performance and durability of steel stacks, such as wind loads, seismic loads, thermal expansion, corrosion, vibration, lightning protection, and access requirements.
Asme Sts-1-2006.pdf
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ASME STS-1-2006 is widely recognized and adopted by engineers, contractors, owners, and regulators as a reference for steel stack design and construction. The standard is also periodically updated to reflect the latest advances in technology and best practices in the industry. The most recent edition of ASME STS-1 was published in 2018 and supersedes the 2006 edition.
To access the full text of ASME STS-1-2006 or ASME STS-1-2018, you can purchase a PDF copy from the ASME website[^1^]. Alternatively, you can also find a hardcopy version in some libraries or online bookstores.
Steel Stack Design Examples
In this section, we will present some examples of steel stack design using the ASME STS-1-2006 standard. The examples are based on hypothetical scenarios and are not intended to be used as actual design cases. The examples are for illustration purposes only and do not cover all the aspects and details of steel stack design.
Example 1: Self-Supporting Steel Stack for a Power Plant
Given: A power plant requires a self-supporting steel stack to vent the exhaust gases from a boiler. The design parameters are as follows:
Stack height: 60 m
Stack diameter: 3 m
Stack shape: Cylindrical
Gas temperature at stack inlet: 200 ÂC
Ambient temperature: 20 ÂC
Wind speed: 40 m/s
Seismic zone: 2
Material: ASTM A36 steel
Lining: None
Coating: Paint
Insulation: None
Appurtenances: Ladder, platform, sampling port, lightning rod
Required: Design the steel stack according to ASME STS-1-2006.
Solution:
Determine the design loads on the stack.
The design loads include dead load, live load, wind load, seismic load, thermal load, and other loads.
Dead load: The weight of the stack and its appurtenances.
The weight of the stack can be estimated by assuming a uniform wall thickness and using the formula:
w = π * D * t * ρ
where w is the weight per unit length of the stack, D is the diameter of the stack, t is the wall thickness of the stack, and ρ is the density of the material.
The wall thickness can be assumed to be 10 mm for preliminary calculations. The density of ASTM A36 steel is 7850 kg/m.
Therefore, w = π * 3 * 0.01 * 7850 = 736.5 kg/m
The weight of the appurtenances can be estimated by using typical values or manufacturer's data. For this example, we assume the following weights:
Ladder: 50 kg/m
Platform: 500 kg (at mid-height)
Sampling port: 100 kg (at 10 m from top)
Lightning rod: 50 kg (at top)
The total dead load per unit length of the stack is:
wd = w + wL
wd = 736.5 + 50 = 786.5 kg/m
Live load: The weight of personnel and equipment on the platform.
The live load can be taken as a uniform load of 2.4 kN/m on the platform area or a concentrated load of 4.5 kN at any point on the platform, whichever produces greater effects.
The platform area can be estimated by assuming a circular shape with a diameter equal to 1.2 times the stack diameter.
Ap = π * (1.2 * D)/4
Ap = π * (1.2 * 3)/4 = 10.18 m
The uniform live load on the platform is:
wL1 29c81ba772
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