The auxiliary oil-fired water-tube steam boiler on your ship-docking tug is equipped with a water column similar to that shown in the illustration. As...

Question

The auxiliary oil-fired water-tube steam boiler on your ship-docking tug is equipped with a water column similar to that shown in the illustration. Assuming that the water level is at the normal operating water level (NOWL) of the boiler, what would be the result of alternately opening and reclosing each of the water column tri-cocks?

Accepted Answer

Steam should issue from the uppermost tri-cock, and water should issue from lowermost tri-cock. Either steam or water could issue from the middle tri-cock.

Engine: Motor Plants and Auxiliary Boilers

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