Abstract: The disclosure provides novel means and methods for the repair of water caissons in situ, for example at sea. The method generally includes providing a woven composite sock inside the caisson. The method further includes inserting a calibration tube into the composite sock within the caisson. The calibration tube can be filled with a pressurised fluid, preferably water, to pressurise the sock against the internal walls of the caisson. The sock can be infused with an epoxy resin. The resin is preferably water-curable. The composite sock can be allowed to cure with the calibration tube in place. The calibration tube can apply pressure to press the composite sock against the inner wall of the caisson. Once the composite matrix has cured to form a cured composite liner for the caisson, the calibration tube can be removed.

Abstract: A method for lining at least a portion of the inner wall of an upstanding tubular includes inserting a liner sleeve into the tubular. The liner sleeve includes a sleeve of flexible sheet material impregnated with and/or coated with a curable polymer composition. The liner sleeve is held in a tubular and a liner sleeve locating tool is inserted into the tubular and inside the liner sleeve. Operating the liner sleeve locating tool holds the outer surface of the liner sleeve in contact with the inner surface of the tubular; and curing the polymer composition bonds the liner sleeve to the inner wall.