F - Mech Eng,Light,Heat,Weapons – 03 – B
Patent
F - Mech Eng,Light,Heat,Weapons
03
B
F03B 11/00 (2006.01) B28D 1/00 (2006.01) B28D 1/02 (2006.01) B28D 1/14 (2006.01) E02B 9/00 (2006.01)
Patent
CA 2488900
Draft tube embedments of a hydroelectric turbine are removed for replacement and/or upgrading. Several shafts for saw wire access, forming a horizontal polygonal shape are drilled outside the draft ring and a circular slot cut below the bottom ring to meet the shafts. Shafts and slot encompass the embedments. Additional shafts are drilled for hoist slings. Generally radial cuts are made using diamond saw wires attached to saw wire machines from selected saw wire access shafts to the draft tube through the embedments. Back cuts are made between adjacent saw wire access shafts, again by diamond saw wires attached to saw wire machines, cutting the polygon into sections. Hoisting slings are passed down the hoisting sling shafts around the sections. The sections are then cut free by further back cuts and then hoisted from the draft tube. The method is quicker than conventional methods.
Bailey R.w.b.
Johnston Edward P.
LandOfFree
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