In order to ensure the gauge glass indicates an accurate water level reading, the stationary engineer should:

The correct action to ensure that the gauge glass indicates an accurate water level reading is to blowdown the gauge glass. This procedure involves flushing out any sediment or debris that may accumulate inside the gauge, which could obstruct a clear view of the water level. Over time, minerals and other impurities can build up, leading to inaccurate readings. By employing the blowdown method, the steam engineer clears the pathway, allowing for a reliable indication of the actual water level in the boiler.

While calibration and inspection are important for overall maintenance and safety, they do not directly address the immediate issue of blockage within the gauge glass. Regular inspection for leaks is crucial for safety but does not inherently correct reading inaccuracies caused by sediment. Frequent replacement of the gauge glass may be unnecessary if proper maintenance, including blowdown, is conducted. Therefore, blowing down the gauge glass is the most effective way to maintain accurate and reliable water level readings.