Safety relief equipment is provided in any pressurized system, and boilers are no exception. Boilers have safety valves can relieve the entire generating capacity of the boiler if the pressure goes above a limit and are provided in the drum, superheater, and reheater. Boilers are high pressure and temperature systems used for generating steam to drive steam turbines for electricity generation. If, due to any reason of operation or malfunction in equipment or controls, the operating pressure in the system goes above the safe limit of the material of construction, it can cause catastrophe. To prevent such catastrophes, safety valves are provided in the boiler at various locations. Safety valve locations The boiler drum holds both water and steam in large quantity. It is the thickest component in the system, and the component that most needs protection against pressure increases above the limit. There are normally two to six safety valves provided in the drum depending upon the capacity.BALL VALVES The superheater outlet will have one to three safety valves on either side of the boiler. There will be an electromatic relief valve on the superheater pipe in addition. This valve will be set at lower pressure than the lowest set safety valve on the superheater. The reheater pipes both at the inlet and outlet side will also have safety valves which can range from two to eight both in the inlet and outlet of the reheater put together.

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