The distillate produced by a flash...

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Question 1 of 205eccef9cbacbc34ba4d45806

The distillate produced by a flash evaporator has a salinity of 0.21 grains per gallon, with a feed water temperature entering the first-stage of the evaporator at 170°F. Under these conditions the three-way solenoid valve will __________.

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🔍 Key Concepts

• Flash evaporator operation and purpose of the three-way solenoid valve • Acceptable salinity limits for distillate going to potable/freshwater tanks (in grains per gallon or ppm) • Effect of feed water temperature on distillate quality and control valves

💭 Think About

• Compare the given salinity (0.21 grains per gallon) to typical maximum limits for water that is allowed into freshwater tanks. Is this value high, low, or very low? • Think about why a three-way solenoid valve is used in a distilling plant. Under what conditions would it send water to the bilge versus to the freshwater tanks versus recirculate? • How does a relatively high feed water temperature (170°F) generally affect the efficiency and purity of the distillate produced by a flash evaporator?

✅ Before You Answer

• Verify the typical salinity cutoff at which distillate is diverted away from the freshwater tanks (look at grains per gallon or ppm limits in your study materials). • Check what the three-way valve does when the salinity is below the set point versus when it is above the set point. • Confirm whether recirculation paths (back to feed inlet or saltwater heater) are normally controlled by other system components or this same three-way solenoid valve in standard flash evaporator diagrams.

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