Question 214Steam Plants - 1st Asst/Chief70% to pass
Under what operating conditions may water wall header drains be used for blow down?
AI Explanation
The correct answer is C) Only if the fires are secured and no steam is being generated.
This is the correct answer because the use of water wall header drains for boiler blow down is only permitted when the boiler is not actively generating steam. If the fires are still active and steam is being produced, using the water wall headers to rapidly drain the boiler could lead to dangerous conditions and damage to the boiler. The other options are incorrect because they describe situations where rapid boiler drainage would be unsafe or unnecessary.
Related Questions
#212 In most marine boilers, the primary reason the first few rows of generating tubes, called screen or furnace row tubes, are made larger in diameter than the rest of the generating tubes is because _______________.#213 Which area shown in the illustration will offer the most resistance to heat transfer from the fireside to the waterside of a boiler tube? Illustration SG-0017 #215 If a ship is to be laid up for an indefinite period, the steam side of the main condenser should be _______________.#216 The rate of heat transfer in a water-tube auxiliary boiler can be increased by _______________.#217 Which of the following statements concerning fire-tube boilers is correct?