Steam drum water level indicators must be...

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Question 1 of 205eccefa5bacbc34ba4d48796

Steam drum water level indicators must be calibrated to compensate for density differences between the indicated drum water level, and the actual drum water level. If no compensation is made, the indicator will show a __________.

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🔍 Key Concepts

• Density of water changes with temperature and pressure in a steam drum and external gauge lines • How a water column / gauge glass is connected to the steam drum (top to steam space, bottom to water space) • What happens to water level indication when the water in the drum and in the gauge piping do NOT have the same density

💭 Think About

• Think about what happens to water density as drum pressure and temperature increase: does it become heavier or lighter? • If the water in the gauge glass (or reference column) is cooler/denser than the water actually in the drum, will a given actual water volume rise higher or lower in the glass? • As drum pressure goes up, does the density difference between the drum water and the cooler reference water get larger or smaller, and how would that affect the size of the indication error?

✅ Before You Answer

• Be clear whether the indicated level will be higher or lower than the actual drum level when the gauge water is denser than the drum water • Decide whether the error increases with increasing pressure or with decreasing pressure based on how density difference changes • Mentally sketch a simple U-tube with hot, less-dense water on one side and cooler, denser water on the other to visualize which side stands higher

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