All steam and hot water boilers are required to have a pressure relief valve. What is one installation requirement that is not needed?

The correct answer focuses on the context of pressure relief valve installation requirements for steam and hot water boilers. The requirement for the discharge pipe of the relief valve to drain into a sump tank is not necessary.

The primary function of a pressure relief valve is to ensure that, in case of overpressure conditions, the excess steam or hot water can be safely released to prevent the risk of explosion or damage to the boiler system. While other guidelines emphasize ensuring that the discharge pipe is installed correctly—such as it ending freely to allow for safe venting, being visible for easy inspection, or potentially being insulated to prevent heat loss or injury—the specific requirement for it to drain into a sump tank is not a universal necessity.

Discharge pipes often need to end freely in order to direct the released steam or water away from personnel and equipment safely, and visibility is crucial for maintenance checks. Insulation may be required in some contexts to maintain safety and efficiency, especially regarding hot water. In contrast, the option of draining into a sump tank is more contingent upon specific system designs and local codes rather than a blanket requirement.