Question 221Steam Plants - 1st Asst/Chief

70% to pass

The tube sheets installed in a fire-tube auxiliary boiler are normally connected by _______________.

Agirder stays
Bfire-tubes and stay-tubes
Cexternal boiler plating
Dseparate crown sheets
AI Explanation

The correct answer is B) fire-tubes and stay-tubes. In a fire-tube auxiliary boiler, the tube sheets are the thick plates at the front and rear of the boiler that the fire-tubes are connected to. The fire-tubes pass through the tube sheets and are expanded and welded in place to securely connect the tube sheets. Stay-tubes, which are shorter tubes that connect the front and rear tube sheets, also help secure the tube sheets in place. The other options are incorrect because: A) girder stays are not used to connect the tube sheets, C) the external boiler plating does not directly connect the tube sheets, and D) separate crown sheets are not a component of a fire-tube boiler.

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Official Resources
46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center
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