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US 6,386,236 B1Granted
Method of prestressing and reinforcing damaged cylindrical structures
AssigneeAir Logistics Corporation
InventorDavid L. Buckley
Life of this patent
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AssigneeAir Logistics Corporation
InventorDavid L. Buckley
Estimating the term…
A method of prestressing and reinforcing damaged pipes includes using a resin impregnated substrate, or a fiberglass fabric coated with a resin, to wrap a damaged area of the pipe. In order for the substrate to compress the pipe, the pipe is wrapped tightly. The compressed pipe has a negative hoop stress when the pipe is not under internal pressure. This negative hoop stress offsets the hoop stress due to the internal pressure from the fluid flow, so that the maximum hoop stress of the pipe is not exceeded. In an effort to provide this tightness, a pressurized portion of resin is introduced between the substrate and the pipe. A bladder may be inserted between the pipe and the substrate to contain a functional amount of prestressing resin injected under pressure. The resin used for prestressing can be the same as or different from the resin used to impregnate or coat the fiberglass strips.
A method of repairing a damaged area of a cylindrical structure while the cylindrical structure is subject to operating loads thereby increasing the hoop stress to the damaged area above a predetermined hoop stress of the undamaged portion of the cylindrical structure, comprising:
A repaired vessel with a wall having a damaged portion and undamaged portions, the vessel having a pressurized fluid flow, the repaired vessel comprising:
A method for operating a pressurized fluid system in which fluid is intended to be present at a predetermined pressure in a vessel, the vessel having a wall with a substantially localized weakened area which requires the fluid pressure to be at a reduced pressure correlated to a tensile stress level in the weakened area which pressure is reduced a desired amount from a design tensile stress level, the method comprising the steps of:
A method of repairing a damaged area of a structure while the structure is subject to operating loads thereby increasing the hoop stress to the damaged area above a predetermined hoop stress of the undamaged portion of the structure, comprising:
Dependencies are inferred from the claim text.