The fireman/water tender secures the fires because there is no visible water level in the gage glasses of a steaming boiler. Upon inspection, you observe condensate trickling down the inside of the gage glass. This indicates __________.
• Boiler water level indication and how a gage glass shows normal, high, and low levels • Behavior of steam and condensate inside a gage glass when the actual drum level is out of sight • Relationship between no visible water level and what you see forming on the inside surface of the glass
• Think about what it means when you cannot see a clear water line in the glass but you do see condensate slowly forming and running down the inside—where is that condensate coming from? • Consider how the gage glass would look if the drum were truly full of water versus if it were mostly steam—what would you expect to see in each case? • Ask yourself: does a trickle of condensate on the inside of the glass suggest that the glass is filled with water, filled with steam, or experiencing violent carryover (priming)?
• Be clear on how a properly functioning gage glass should look at normal level—distinct water/steam interface • Mentally compare visual signs of high water (completely flooded glass) versus low water (mostly steam in glass with possible condensate on walls) • Rule out conditions like priming or steam binding by asking: would they mainly affect the drum level, the feed control system, or the appearance inside the gage glass itself?
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