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. 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. « Previous Next »
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