The auxiliary oil-fired water-tube steam...

Question 1 / 2066636eef28f7522a1c51f788

Question 1 of 2066636eef28f7522a1c51f788

The auxiliary oil-fired water-tube steam boiler on your anchor-handling supply vessel is equipped with a water column similar to that shown in the illustration. If the gauge glass becomes disabled or there is uncertainty associated with the gauge glass reading, the tricocks can be used to determine the boiler water level. What statement best describes the challenge associated with trying to differentiate between steam and water? Illustration MO-0093

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🔍 Key Concepts

• Saturated water and steam behavior in a boiler drum — what happens to hot water released to a lower pressure, and what happens to hot steam hitting a cooler surface or air • Purpose of upper, middle, and lower tricocks in relation to normal water level in the gauge glass/water column • Flashing vs. condensing — which one makes it hard to tell if the opening is above or below the true water level

💭 Think About

• When you crack open a tricock that is truly below the water level, what comes out first, and how might its appearance change as it exits into the space at lower pressure? • If you open a tricock that is truly above the water level, what would you expect to happen to the steam jet as it meets cooler metal/air — will it stay invisible gas or quickly turn to a visible white cloud of condensed droplets? • Which of the answer choices actually describes a situation where you might be fooled about whether the tricock is in water or steam because what you SEE is not what is really in the drum at that point?

✅ Before You Answer

• Think about saturated boiler water flashing to steam when pressure suddenly drops at the outlet of a valve or orifice. • Consider whether all of a fluid is likely to change phase instantly, or whether some fraction is more realistic under boiler operating conditions. • Decide which choice best describes a condition that would make it visually difficult to distinguish between water discharge and steam discharge when using the tricocks.

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Question 1 of 20

On a tricock situated below the water level, when opened some of the escaping water will flash to steam.

On a tricock situated below the water level, when opened all of the escaping water will flash to steam.

On a tricock situated above the water level, when opened all of the escaping steam will condense to water.

On a tricock situated above the water level, when opened some of the escaping steam will condense to water.

Question 1 / 2066636eef28f7522a1c51f788

Question 1 of 2066636eef28f7522a1c51f788

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66636eef28f7522a1c51f788

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💭 Think About

✅ Before You Answer

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