Engine 2014: Steam Plants

1. 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.
2. 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.
3. C To ensure adequate blow down, the aggregate cross sectional  area of these perforated holes must be equal to approximately twice the cross sectional area of the pipe.
4. D All of the above.

Tip: press A-D to answer