Plug, method of expanding inside diameter of metal pipe or...

Details Plug, method of expanding inside diameter of metal pipe or... Plug, method of expanding inside diameter of metal pipe or...

B - Operations, Transporting

21

D

B21D 39/20 (2006.01)

Patent

CA 2685217

A metal pipe or tube comprises a first hollow cylindrical portion near a center portion of said metal pipe or tube, a second hollow cylindrical portion on at least one of the two end portions of said metal pipe or tube, and a taper portion connecting said first and second hollow cylindrical portions. The outside diameter of said first hollow cylindrical portion is DA. The outside diameter of said second hollow cylindrical portion is DB larger than the outside diameter DA of said first hollow cylindrical portion. The outside diameter of said taper portion gradually increases from DA to DB from said first hollow cylindrical portion to the second hollow cylindrical portion. The axial distance LE between points where the diameter DC = DBx0.99 and DB satisfies Expression (a) 22<=LE/((DB- DC)/2)<=115.

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