The function of the water level indicator is to show the water level inside the boiler drum. Totally two water level indicators are provided on the boiler drum. The constructional details are shown in Figure 4.18. One end of the glass tubes is connected to steam space and other end to water space through a hollow pipe of gun metal bolted to boiler. In case if tube breaks, two balls are provided that move to the dotted positions due to rush of water in the passage. The steam will also rush from upward hollow column and will push the balls in dotted positions.
Figure 4.18 Water Level Indicator
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