Process and apparatus for sleeve repair of pipe line

Details Process and apparatus for sleeve repair of pipe line Process and apparatus for sleeve repair of pipe line

1987-08-07

1988-05-31

Recla, Henry J.

Pipes and tubular conduits

Repairing

138172, 228 443, 228119, 228212, 25940209, 285286, F16L 5518

Patent

active

047474300

ABSTRACT:
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.

REFERENCES:
patent: 3151632 (1964-10-01), Risley et al.
patent: 3870218 (1975-03-01), Ehle
patent: 4172472 (1979-10-01), Parrish
patent: 4327473 (1982-05-01), Somerville
patent: 4535822 (1985-08-01), Rogers, Jr.
patent: 4644975 (1987-02-01), Fricker

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