Hutton, Frederick Remsen, 1853- [from old catalog] · New York, J. Wiley & sons; [etc., etc.] · leaf 485
, theend of the tube is slightly turned over or upset—called bead-ing—so as to grip the outer face of the tube-sheet. Thisboth adds to strength and serves to prevent leakage. Thebeading is usually done with a special form of swaging-chisel,often called a * thumb-swage from the shape of its… … Fig. 383. There are other forms of tube-expander, acting by weag-ing or direct pressure, but the roller form takes less powerand gives better results. The fit of the expanded-tube is apressure and frictional one. Hence any tendency to push orpull the tubes through the tube-sheet (from heat or…
Mechanical engineering · Steam power plants
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