USCG USCG Steam
Set 12 • Question #102 of 496
Launch Interactive Practice Room Which of the drains listed could be led directly to a DC heater operating at 35 psig (343 kPa)?
A
Drain inspection tank overflow only.
B
Contaminated evaporator relief valve drain only.
C
An auxiliary steam line drain.
✓ Correct Answer
D
Only those steam drains which operate at 35 psig (343 kPa) or less.
USCG NMC Regulatory Explanation
The Deaerating Feed Tank (DFT / DC Heater) scrubs dissolved oxygen and non-condensable gases from boiler feedwater using direct contact steam heating, preventing localized oxygen pitting corrosion in economizers and steam drums.
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