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ASME STS-1-2016 pdf free

ASME STS-1-2016 pdf free.Steel Stacks.
Section 3 will provide the designer with information that will help him to determine whether or not an inte- rior lining and/or an exterior coating should be used on the stack, the types of linings and coatings that may be considered, and the general chemical and thermal limitations associated with each type. Considerations with respect to the use of insulating linings and exterior insulation also are presented.
(a) Linings for the interior of steel stacks may be required to provide resistance to corrosive gases, vapors, or condensates; to provide resistance to heat; and to maintain stack surface temperatures for the prevention of condensate corrosion.
(b) To determine whether a lining should be used, a complete thermal analysis of the entire system from heat source to stack outlet should be performed giving primary consideration to the stack surface temperature. A complete chemical and physical analysis of the flue gas should also be performed to determine the presence of chemically corrosive constituents and the characteristics of particulate loading.
Temperature/Corrosion. The metal surface temperatures of uninsulated, unlined steel stacks may fall below flue gas dew points within the stack or at the stack outlet.
The most commonly quoted stack temperature is the flue temperature at the stack inlet. It is also the most misleading because it is the metal surface temperature that is of importance. Uninsulated unlined steel stacks can have metal surface temperatures 60% or more below the flue temperatures at the stack inlet, whereas stacks with external insulation often will have metal surface temperatures that are only slightly lower than the inlet flue gas temperature.
Critical corrosion temperatures are not absolute values covering all situations but present focal points for more detailed study, ie, if stack surface temperatures fall below acid condensation dew points, exteral insulation and/or higher fue gas velocities could correct the situation. External insulation can be used to maintain stack surface temperature at least 50^F (28°C) above the flue gas dew point. If metal temperatures are exceeded,internal linings may be used to provide a solution.ASME STS-1 pdf free download.


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