This disclosure relates generally to corrugated pipe, and more particularly to corrugated pipe with an outer wrap. In one embodiment, a pipe includes an axially extended bore defined by a corrugated outer wall having axially adjacent, outwardly-extending corrugation crests, separated by corrugation valleys. The pipe also includes an outer wrap applied to the outer wall. The outer wrap may include fibers and plastic. The outer wrap may span the corrugation crests producing a smooth outer surface.

A strengthened polyethylene tubular member, where the polyethylene tubular member has an outer surface, a circumference, a wall thickness, an area to be strengthened, and the outer surface of the polyethylene tubular member contains polyethylene. The strengthened polyethylene tubular member contains a fabric layer wrapped around the circumference of the tubular member at least two full rotations and covering the area to be strengthened. The fabric layer contains a plurality of interwoven tape elements with a base layer of a strain oriented olefin polymer disposed between covering layers of a heat fusible olefin polymer. The tape elements within the fabric layer are bonded together and the tape elements adjacent the tubular member are bonded to the tubular member.

Systems and methods for reinforcing structures with composite reinforcement systems are disclosed herein. According to aspects of the present disclosure, a carrier of a composite reinforcement system for repairing and/or reinforcing a physical structure is disclosed. The carrier includes a plurality of carbon fibers. Each carbon fiber has a longitudinal axis and a length extending in a generally 0 degree direction. The carrier further includes at least one fiberglass fiber having a longitudinal axis and a length extending in a generally 90 degree direction across the plurality of carbon fibers. The plurality of carbon fibers constitute at least about 70 wt % of the carrier and the at least one fiberglass fiber constitutes at most about 30 wt % of the carrier.

A method for strengthening a polyethylene tubular member. The polyethylene tubular member has an outer surface, a circumference, a wall thickness, and an area to be strengthened and the outer surface of the polyethylene tubular member contains polyethylene. The method contains the step of wrapping a fabric layer around the circumference of the tubular member at least two full rotations and covering the area to be strengthened. The fabric layer contains a plurality of interwoven tape elements with a base layer of a strain oriented olefin polymer disposed between covering layers of a heat fusible olefin polymer. The method also contains the step of applying heat and optionally pressure to the fabric layer bonding the tape elements of the fabric layer together and bonding the tape elements and the tubular member together.

A strengthened polyethylene tubular member, where the polyethylene tubular member has an outer surface, a circumference, a wall thickness, an area to be strengthened, and the outer surface of the polyethylene tubular member contains polyethylene. The strengthened polyethylene tubular member contains a fabric layer wrapped around the circumference of the tubular member at least two full rotations and covering the area to be strengthened. The fabric layer contains a plurality of interwoven tape elements with a base layer of a strain oriented olefin polymer disposed between covering layers of a heat fusible olefin polymer. The tape elements within the fabric layer are bonded together and the tape elements adjacent the tubular member are bonded to the tubular member.

A roller for compressing protective sheeting of polymer material around a pipeline rotates about a given or designated axis of rotation and has a shaft; and a first tubular portion which extends about the shaft and varies in elasticity along the given or designated axis of rotation; more specifically, the first tubular portion is of greater elasticity at the ends of the roller than at the center of the roller.

Anti-corrosion composition comprising at least a first polyisobutylene with a Staudinger index J.sub.0 ranging from about 15 cm.sup.3/g to about 98 cm.sup.3/g and an average relative molar mass M.sub.V ranging from about 32,000 g/mol to about 280,000 g/mol and at least a second polyisobutylene with a Staudinger index J.sub.0 ranging from about 105 cm.sup.3/g to about 238 cm.sup.3/g and an average relative molar mass M.sub.V ranging from about 350,000 g/mol to about 900,000 g/mol.

The invention is directed to an insulation composition comprising the following layers (a) a hydrophobic, moisture permeable layer composed of a woven, non-woven, or knit fibrous material, (b) a hydrophilic wicking layer, (c) an insulation material layer. The invention is also directed to a method to remove water from an insulated metal transport conduit comprising a metal transport conduit and an insulation composition, wherein the insulation composition comprises of a layer (b1) of a high void material, by supplying a stream of gas to the layer of high void material at a first point and discharging a stream of the gas and any water picked up from the high void material at a second point. The invention is also directed to a method to detect and locate liquid water in an insulation composition positioned around a metal transport conduit wherein the insulation composition comprises of a layer of wicking material and wherein the method is performed by measuring the local electric conductivity in said wicking material.

This disclosure relates generally to corrugated pipe, and more particularly to corrugated pipe with a reinforcing stiffener. The corrugated pipe may include an axially extended bore defined by a corrugated outer wall having axially adjacent, outwardly-extending corrugation crests, separated by corrugation valleys. In some embodiments, a stiffener may be positioned within the corrugation valleys. In other embodiments, a stiffener may be positioned within the corrugation crests.

This disclosure relates generally to corrugated pipe, and more particularly to corrugated pipe with a reinforcing stiffener. The corrugated pipe may include an axially extended bore defined by a corrugated outer wall having axially adjacent, outwardly-extending corrugation crests, separated by corrugation valleys. In some embodiments, a stiffener may be positioned within the corrugation valleys. In other embodiments, a stiffener may be positioned within the corrugation crests.