Any outlet piping from the relief valve must be what size?

The outlet piping from the relief valve must be the same size as the pipe outlet of the relief valve to ensure proper function and efficiency. This is crucial because if the outlet piping is not sized correctly, it can create back pressure that may prevent the relief valve from operating correctly. By maintaining the same diameter, the system allows for the safe and effective discharge of steam or fluid as needed, which is vital to prevent overpressure situations. Proper sizing helps to facilitate quick venting of excess pressure, thus ensuring safety and operational reliability within a steam system.