Boiler Design

Boiler selection and design are affected by many factors. Capacity, operating temperatures and pressures, and fuel type are among the most significant. Factors such as duty cycle and anticipated range of operating loads, as well as water quality and emissions control requirements, must also be carefully considered.

A number of codes, standards, laws, and regulations cover boilers and related equipment. The boiler industry is largely regulated by the American Society of Mechanical Engineers (ASME) codes. These codes govern boiler design, inspection, and quality assurance. Numerous other codes and requirements may be mandated by individual insurance companies and by federal and state regulations. These include environmental standards, operating standards, and sewer discharge temperature regulations, to name a few. The selection process must therefore include a review of all requirements to ensure safe, proper, and legal operation.

The following are descriptions of boiler types and design features. Both firetube and watertube boilers are discussed, with a more detailed focus on watertube designs. While the descriptions relate to fuel-fired boilers, many of the same design features apply to non-fired and partially fired heat recovery steam generators. Heat recovery is discussed in more detail in the following chapter.

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