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

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Question 1 of 2066636eef28f7522a1c51f78e

The auxiliary oil-fired water-tube steam boiler on your tug is equipped with a water column similar to that shown in the illustration. The most accurate way to determine the boiler water level is by alternately opening and reclosing the tri-cocks. At what point is the normal operating water level (NOWL) of the boiler? Illustration MO-0093

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Question 1 of 20

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🔍 Key Concepts

• Function of tri-cocks on a boiler water column (high, normal, and low indicators) • Relationship between NOWL (Normal Operating Water Level) and the safe steaming range in the drum • How opening each tri-cock tells you if the boiler level is above, at, or below that point

💭 Think About

• When you crack open the upper, middle, and lower tri-cocks one at a time, what should come out (steam, water, or a mix) when the boiler is at its proper operating level? • Which tri-cock position best represents the center of the safe water level range, rather than the absolute high or low limit?

✅ Before You Answer

• Identify which tri-cock is intended to indicate high level, which indicates low level, and which indicates the normal level. • Think about boiler damage: would you want the NOWL to be right at the high limit, right at the low limit, or somewhere between them? • Visualize the water line in the drum and water column when the gauge glass shows a normal level—is that line aligned with the top, middle, or bottom tri-cock?

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