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Which is of the following is determined by deploying multiple gauge glasses in boilers?
1. Flow
2. Pressure
3. Velocity
4. Level

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Correct Answer - Option 4 : Level

Explanation:

Gauge glass:

  • It is a water level indicator used in steam boilers to view the level of water in the boiler by the operator.
  • A gauge glass shows the current level of water in the boiler, regardless of the boiler’s operating conditions.
  • Gauge glasses should be installed so that their lowest reading will show the water level at 50 mm above the point where overheating will occur.
  • They should also be fitted with a protector around them, but this should not hinder the visibility of the water level.
  • Gauge glasses are prone to damage from a number of sources, such as corrosion from the chemicals in the boiler water, and erosion during blowdown, particularly at the steam end.
  • Any sign of corrosion or erosion indicates that a new glass is required.

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