How frequently should the water column and gauge glass be blown down for proper maintenance?

The correct choice is that the water column and gauge glass should be blown down daily for proper maintenance. This practice is essential to ensure accurate level readings and proper operation of the boiler system. Blowing down the gauge glass removes any debris, mineral deposits, or sediments that could accumulate and obstruct the view of the water level. Regularly maintaining the gauge glass by blowing it down prevents the possibility of inaccurate readings, which can lead to potentially dangerous situations if the boiler water level is misjudged. Additionally, this daily procedure helps to maintain the overall efficiency and safety of the boiler operation, as it ensures that the gauge functions correctly and provides reliable information for operators.