What precautions should be taken when operating a flush level gauge?

During the flushing process of the level gauge, care must be taken to prevent both the steam connection valve and the water connection valve from closing at the same time, as this would prevent both steam and water from entering the level gauge, causing it to cool down rapidly. Cold air would then enter the level gauge through the drain valve, accelerating its cooling further. When the water connection valve or the steam connection valve is opened again and fluid enters, the large temperature difference can cause damage to the level gauge. When timing the flushing water level under working pressure, the drain valve should be opened very slightly. This is because the pressure inside the gauge is very different from the external ambient pressure; if the water release valve is opened too wide, the steam and water expand violently, resulting in high flow rates that could damage the mica sheets or cause the gauge to explode. The larger the water release valve is opened, the more pronounced the aforementioned phenomenon becomes. Additionally, when timing the flushing water level, be careful to ensure personal safety to prevent scalds from the spraying water. It is best to perform flushing after each production cycle, when the air pressure is between 1 and 2 MPa.

Note: The time during which both the steam valve and the water valve are closed at the same time should be short, to prevent the gauge glass from breaking due to sudden changes in temperature.

Operation of the flushing level gauge – for boilers?