What purpose do boiler handholes serve?

Boiler handholes serve a crucial function by allowing for inspection of the boiler shell or drum. These openings, which can be covered with a removable plate, provide access to internal surfaces that need to be visually checked for signs of wear, corrosion, or other potential issues that could affect the boiler's performance and safety. Regular inspections through handholes are essential for maintaining the integrity of the boiler system and ensuring it operates correctly and safely. Proper inspection can help in early detection of problems before they lead to more serious malfunctions, which is vital for effective maintenance and compliance with safety regulations.

Other functions related to fuel addition, pressure regulation, and combustion efficiency are managed through different components of the boiler system and do not involve handholes directly. Thus, the primary role of handholes is indeed to facilitate the inspection process.