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27. The auxiliary oil-fired water-tube steam boiler on your tug is equipped with a water column similar to that shown in the illustration. The most accurate way to determine the boiler water level is by alternately opening and reclosing the tri-cocks. At what point is the normal operating water level (NOWL) of the boiler
The normal operating water level (NOWL) on a marine water-tube boiler with a three-cock water column is located at the middle tri-cock, which serves as a reference point; the upper and lower cocks indicate high and low water limits, respectively.
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