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Tube-fer′rule.


Steam.) A short sleeve for fastening tubes in tube-sheets. Usually a slightly tapered hoop driven in at the end of the tube to fix it securely in the boiler.

Tube-ferrule.

In Fig. 6738, the tube-holes are bushed with inward flaring ferrules, and the tube end is surrounded with a ferrule whose outward surface is brought in contact with the inner surface of the bushing by a nut screwing on its outer end.

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