Chimneys and Stacks

Having a strong understanding of the process of exhaust stream, such as volume, corrosiveness, temperature, and load conditions is critical to design chimneys and stacks. It is also required to understand the local environment and regional building code requirements. After confirming the desired geometry, and other design conditions such as gas entry and flow, base configuration, and lateral support etc., the design engineer can construct the numerical model to come out the final design.

Chimneys and stacks must be designed for the process, and then they will be analyzed to make sure they are mechanically strong enough to withstand the environmental adverse conditions. The following conditions are among the importance factors to be considered:

  • Location - The location and height of the stack is normally influenced by the process requirement, space allocation, and topography.
  • Wind & Seismic Loads - Wind and seismic loads are normally governed by the applicable local building codes.
  • Supports and Foundations - The supporting system can be design in a wide variety of configurations. The design engineer will have to decide the proper system to accommodate the level of loading and client specifications. Stack foundation is normally made of concrete. The foundation design will be according to the local concrete design code or the client agreed popular codes.
  • Access Platforms - Platforms are the common fixtures and they are normally designed per the requirements of OSHA and local building codes. Accessing to the platform is usually through ladders if there is no other convenient access from adjacent building or structure.
  • Corrosion Requirements - Materials of construction need to consider based on long term performance.