F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
189/13
F16L 45/00 (2006.01) B23K 37/053 (2006.01) F16L 55/17 (2006.01)
Patent
CA 1237682
"PROCESS AND APPARATUS FOR SLEEVE REPAIR OF PIPE LINE" ABSTRACT OF THE DISCLOSURE A longitudinally split cylindrical sleeve, consisting of two half shells, is applied to an internally pressurized pipe, to reinforce a section of the pipe wall weakened by an internal or external defect. One pair of adjacent shell ends are first welded together along their length with the shells in place on the pipe in a relaxed condition. The other pair of adjacent shell ends are equipped with longitudinally extending, outwardly projecting, attached shoulder lugs. A clamp assembly is applied to the shoulder lugs to draw them together and tension the sleeve about the pipe. The clamping force applied to the shoulder lugs is monitored and terminated when the applied stress in the sleeve is approximately equal to the stress exerted on the pipe wall by the internal fluid pressure. The free ends of the shells are then welded together longitudinally while in the tensioned condition. The sleeve/pipe combination forms, in effect, a thick-walled cylinder. The stress arising from the internal fluid pressure is distributed across the cylinder. This effectively lowers the stress at the location of the defect. This, in turn, eliminates the need to apply circumferential fillet welds at the sleeve ends, since further deterioration of the defect (which would lead to leaking of the contained fluid) is arrested.
501143
Robinson Harry C.
Stata Paul D.
Johnson Ernest Peter
Robinson Harry C.
Stata Paul D.
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