What is the primary purpose of manholes in a boiler?

The primary purpose of manholes in a boiler is for inspection purposes. Manholes provide access to the interior of the boiler, allowing operators and maintenance personnel to perform visual inspections, cleaning, and maintenance tasks. This access is crucial for ensuring the safe operation of the boiler and identifying any potential issues, such as corrosion, buildup of deposits, or mechanical wear.

While manholes are an important feature of many boilers, they are not universally installed on all types. Their shape can vary and is not limited to being circular. Additionally, manholes are found in different types of boilers, not just fossil-fueled ones, as they serve the substantive need for maintenance and inspection across various boiler designs.