What is required for every steam boiler in addition to a pressure gauge?

For every steam boiler, a water-gauge glass is a crucial requirement alongside a pressure gauge. The purpose of the water-gauge glass is to provide a clear and immediate visual indication of the water level inside the boiler. Maintaining the appropriate water level is critical for the safe operation of a steam boiler; too low a level can lead to overheating and potential damage, while too high a level can cause carryover of water into the steam supply.

Having a water gauge allows operators to monitor the water level without needing to open the boiler or rely solely on the measurements of other devices. While a pressure gauge indicates the steam pressure within the system, it does not provide information about the water level, which is essential for the boiler's safe functioning. This is why the water-gauge glass is mandated in addition to a pressure gauge, ensuring that operators can maintain safe operating conditions and avoid accidents associated with incorrect water levels.