Which of the following components is typically found on or near the top of a steam boiler?

The safety valve, often referred to as a pop-off valve, is a crucial component found on or near the top of a steam boiler. Its primary function is to prevent excess pressure from building up within the system, which can be dangerous and lead to catastrophic failures. The safety valve is designed to automatically release steam when the pressure exceeds a predetermined limit, ensuring that the boiler operates safely within its designed parameters.

This placement is strategic, as the accumulation of steam and pressure is more pronounced in the upper sections of the boiler. By being located at the top, the safety valve can effectively monitor and manage the pressure conditions, providing a critical layer of safety for boiler operation.

In contrast, other components such as the feedwater pump is typically located at the lower part of the boiler, where it feeds water into the system. The pressuretrol, while important for measuring and controlling the pressure within the boiler, is often mounted on the control panel rather than directly on the boiler. The burner assembly, responsible for igniting the fuel to produce heat, is usually situated at the bottom of the boiler or combustion chamber for efficient operation.