Abstract: The present invention provides a method, device and tools for the protection of cadmium welds, holidays or the like on underground pipe portions, wherein the device includes a patch having a fibrous material and a hydrophobic agent that is adapted to form a substantial seal about the pipe portion or otherwise coat the pipe portion with an anti-corrosion agent upon application.

Abstract: A protective sheet material of a laminate structure and a method of manufacture in which the sheet material has a plastic membrane layer joined to a layer of felt. Subsequent to the joining of the felt to the plastic membrane, the felt is saturated with petroleum wax including plasticizers and corrosion inhibitors. A second layer of felt can be joined to the opposite side of the plastic film to provide a sandwich of a plastic membrane between two layers of saturated felt. When this sheet material has been applied in an overlapping manner, there is a felt-to-felt seal at the overlap. The plastic and felt can be joined by heat fusion or by adhesives.

Abstract: A method of protecting underground pipe from corrosion in a region in which it extends through a casing and is subject to the deleterious action of water accumulated in the casing. The ends of the casing are sealed to provide a closed chamber around the pipe. A treatment substance capable of mixing with the water and reducing or neutralizing its deleterious effect is introduced to the chamber. Thereafter a corrosion-resistant compound is pumped into the chamber to substantially fill the chamber with the compound and displace all or much of the water from the chamber.