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Mandrel for hydraulically expanding a tube into engagement with a tubesheet - Patent 4159564 |
 | | The mandrel also comprises passages disposed in the trailing end for inducing pressurized fluid between the grooves, whereby the pressurized fluid is contained between the seals, the membrane, and the tube to hydraulically expand the tube into engagement with the tubesheet. |
 | | The trailing end 11 of the mandrel has a portion 47 which is not coated or covered by a membrane or an electrically isolating material and through which electrical contact is made to the one lead of the eddy current coil 33. |
 | | The mandrels hereinbefore described may be utilized repeatedly to hydraulically expand tubes into engagement with the tubesheet and may be positioned very accurately with respect to the inner edge of the tubesheet resulting in the tubes being expanded into engagement with that portion of the tubesheet which is adjacent to the inner edge thereof. |
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