If there is not enough feedwater available to the Deaerating Feed Tank (DFT), which valve opens?

Prepare for the Machinist's Mate (MM) "A" School Test 3. Study with our extensive collection of flashcards and multiple-choice questions, complete with hints and explanations to ensure you're ready for the exam.

Multiple Choice

If there is not enough feedwater available to the Deaerating Feed Tank (DFT), which valve opens?

Explanation:
When the Deaerating Feed Tank doesn’t have enough feedwater, the makeup feed valve opens to admit fresh water into the DFT. This keeps the tank topped up so the deaerated water can continue to be supplied to the boiler. The main feed valve only passes water from the DFT to the boiler, not to replenish the DFT itself. Drain and vent valves serve drainage and venting functions, not filling the tank.

When the Deaerating Feed Tank doesn’t have enough feedwater, the makeup feed valve opens to admit fresh water into the DFT. This keeps the tank topped up so the deaerated water can continue to be supplied to the boiler. The main feed valve only passes water from the DFT to the boiler, not to replenish the DFT itself. Drain and vent valves serve drainage and venting functions, not filling the tank.

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