USCG USCG Steam
Set 6 • Question #388 of 496
Launch Interactive Practice Room Which of the following statements concerning boiler steam drum surface blow piping is correct?
A
Usually the surface blow pipe is perforated with holes along its top surface; however, when a scum pan is also employed, the holes are located along the bottom of the pipe surface.
✓ Correct Answer
B
The centerline of the pipe is normally situated at a distance from the bottom of the steam drum equal to approximately one fourth the diameter of the drum.
C
To ensure adequate blowdown, the aggregate cross sectional area of these perforated holes must be equal to approximately twice the cross sectional area of the pipe.
D
All of the above.
USCG NMC Regulatory Explanation
In USCG Steam Plants (Boilers & Turbines), regarding 'Which of the following statements concerning boiler steam drum surface blow piping is correct', the verified engineering fact is: 'Usually the surface blow pipe is perforated with holes along its top surface; however, when a scum pan is also employed, the holes are located along the bottom of the pipe surface.'.
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