B - Operations – Transporting – 23 – P
Patent
B - Operations, Transporting
23
P
B23P 19/04 (2006.01) B23P 6/00 (2006.01) F22B 37/58 (2006.01)
Patent
CA 2324487
The method steps of the present invention basically involve first forming a gap-metal tab in the flare end of the boiler tube flared-end segment having an insufficient-depth pair of spaced-apart longitudinal grooves by a radially-inward shear and bend force applied to the tube segment flare, followed by shearing and bending the remaining tube gap metal from the tube segment by applying a force having radially-inward and longitudinally- forward force components applied to the gap-metal tab and to the tube segment gap metal longitudinally contiguous to the tube segment and throughout the tube segment length. Afterwards the fully-gapped tube segment may be conventionally diametrically compressed to reduce the tube segment diameter power boiler drum wall tube bore thereby facilitating subsequent longitudinal withdrawal of the tube segment from retention within that drum wall tube bore.
Advanced Cutting Technologies Ltd.
Gowling Lafleur Henderson Llp
LandOfFree
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