All relief valves must be installed how, in relation to the boiler water level?

Relief valves are critical safety components installed on steam boilers to ensure safe operation by relieving excess pressure. For optimal performance and safety, all relief valves must be installed above the boiler water level. This positioning allows the relief valve to properly vent steam and prevent excessive pressure build-up.

When the relief valve is above the water level, it ensures that any steam escaping from the valve is not impeded by water, allowing for an effective release of pressure. If relief valves were installed below or at the same level as the water, they could potentially become submerged in water or face challenges venting steam effectively. Such scenarios could lead to pressure not being relieved as intended, which can create hazardous conditions.

Installing the relief valves above the water level is a standard practice that facilitates their correct functioning and enhances the safety of the boiler system.