The freshwater cooling systems serving the...

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Question 1 of 2066636eef28f7522a1c51fbeb

The freshwater cooling systems serving the main engines of your offshore supply vessel are of the type shown in the illustration. What statement accurately describes the characteristics of the freshwater cooling circuit? Illustration MO-0137

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Question 1 of 20

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🔍 Key Concepts

• Look closely at the jacket water expansion tank and its vent line to decide if the system is vented or fully pressurized. • Study the fresh water thermostatic control valve symbol and the three labeled ports A, B, and C to determine if it’s a 2‑way or 3‑way valve. • Recall the functional difference between an automotive thermostat (radiator type) and a stationary/marine 3‑way thermostatic valve used with heat exchangers.

💭 Think About

• From the drawing, does the expansion tank appear open to atmosphere (via a vent) or sealed so system pressure can build? How does that affect whether the system is called vented or pressurized? • Count how many separate flow paths the thermostat is routing at one time. Is it only opening/closing flow to the heat exchanger, or is it proportioning flow between a bypass and the heat exchanger? • Think about which type of thermostat (automotive vs stationary/marine) would be better suited for a system that uses a jacket water/sea water heat exchanger rather than a radiator exposed to air.

✅ Before You Answer

• Verify whether the expansion tank has a vent line going to atmosphere; if so, that strongly indicates a vented system. • Confirm whether the thermostat symbol shows three connected lines/ports (bypass, to heat exchanger, from engine), which characterizes a 3‑way valve. • Match the valve function you see on the schematic with the description of automotive 2‑way vs marine 3‑way operation before choosing an answer.

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