| 摘要 |
Apparatus for extracting tubes from the tube sheets of a heat exchanger is provided which is particularly suitable for the removal of tubes of small internal diameter and which includes a tube pulling dart having a tapered threaded end for engagement within the tube and a sleeve secured thereto for automatic attachment of a power operated pulling mechanism. The threads on the dart preferably have a right triangular cross section with vertical faces for applying the load from the threads onto the tube to be extracted. In another embodiment the attachment is manual.
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