Abstract:
In a pipe (1) coated with a resin layer (4) on the inner surface thereof and a method for manufacturing the same, resin mixture including thermal melting fluoro resin and fluorine elastomer is applied to the inner surface of a pipe member. The resin mixture is thermally treated on the inner surface of the pipe member to be of a mesh like pattern so that a resin layer of a predetermined stripping strength is obtained thereon.
Abstract:
A method of manufacturing a length of lined pipe inserts a radially contracted liner pipe into an outer host pipe. Injector needles are inserted through an end of the outer pipe into an annular gap between the pipes. Adhesive is injected between the pipes at locations inboard of the end of the outer pipe. After withdrawing the injectors, at least a portion of the liner pipe is expanded to close the gap and to bond the pipes together via the injected adhesive. Shims can be inserted into the gap between the pipes. A portion of the liner pipe inboard of the shims can be expanded radially while the shims constrain local radial expansion of an outboard portion of the liner pipe to maintain the gap for accommodating the injectors. Withdrawing the shims after injecting the adhesive allows radial expansion of the outboard portion to close the gap between the pipes.
Abstract:
A prefabricated composite concrete element for use in a corrosive sewer environment. The concrete element has a hollow reinforced cast concrete portion with at least one end having connection details, a premolded corrosion resistant inner plastic liner. The plastic liner lines an interior of the hollow concrete element and the connection details to provide abutting liner faces in an assembled joint to limit exposure through said joint of said concrete portion to corrosive materials arising in said sewer environment. At least two prefabricated composite concrete elements may be assembled end to end at a joint to form a concrete sewer system. Also disclosed are a method of prefabricating such a composite concrete element.
Abstract:
An integrity monitoring system for a lined pipeline is provided far monitoring the integrity of a polymer liner in a host pipe. Methods and apparatus are described by which a lined pipeline is provided with such an integrity monitoring system. Sensor cable is able to bridge a joint between sections at lined pipe, for example by routing the sensor cable across the joint via a channel in an electrofusion fitting or by connecting successive lengths of sensor cable via pass-throughs in an electrofusion fitting. Advantageously, the sensor cable is disposed within a continuous annulus between linings and host pipes, and the continuous annulus is maintained across pipe joints using electrofusion fittings.
Abstract:
A liner includes a rubber liner portion, and a polyurethane liner portion disposed on a surface of the rubber liner portion. The rubber polyurethane liner can be applied to cover surfaces of process support elements used to transport or handle process material such as tar sand slurry. The rubber polyurethane liner increases the effectiveness and operating lifetimes of such process support elements.
Abstract:
A carrier pipe is protected from corrosion by being received inside a casing at a location above ground. The casing, which can be formed from a polymer, defines a gap extending around an exterior surface of the carrier pipe. In one embodiment, the gap is substantially filled with a potting material having a corrosion-resistant property. In another embodiment, a self-contained impressed current cathodic protection system is received in the gap. A pull head is installed on the carrier pipe and/or casing for pulling the pipe assembly, including carrier pipe, casing, and elements received in the gap, into an underground bore as a single unit. In some embodiments multiple pipe assemblies are pulled together into the same bore.
Abstract:
A connector used for connecting the plastic metallic pipe includes a body, a cap, and three washers. The body has a section of thread in its outer wall for coupling with the cap which has a section thread in its inner wall. In operation, first insert the pipe into the cap, then insert the rubber washer, the metallic washer, and spring washer into the body, and then screw the cap into the body, such that the pipe is locked with the body.
Abstract:
A method for installing a fiberglass or stainless steel liner into a steel casing which results in a reduction of strain on the casing. Conventional means are used to place the liner into the casing and to fill the annular space with cement. Thereafter, maximum design operating pressure on the liner is maintained while the pressure on the annular space is reduced; maintenance of those pressures keep the liner in an expanded state while the grout cures. As a result, the liner shares the load with the casing; pressure from the fluids contained in the system during operation is not transferred to the casing through the grout until the liner's preset internal pressure is reached. The use of the method greatly reduces the possibility of flowline failure.
Abstract:
A plastic lined pipe with an end corrosive protection core used for snow removal, water supply, air-conditioning, firefighting, drainage, and other piping etc. and a method of production of the same, more particularly a plastic lined pipe with an end corrosive protection core, used connected by a coupling not having an end corrosive protection function, having an adhesive layer on an inner surface of a steel pipe or a steel pipe galvanized on its outer surface, having a polyolefin plastic layer or cross-linked polyolefin plastic layer on its further inner side, the steel pipe given substrate treatment on its inner surface in advance, the substrate treatment comprising forming a phosphate chemical conversion coating treated for grain refinement, and provided at its end with a corrosive protection core formed by a cylindrical part having dimensions and rigidity enabling strong fitting to the end inner surface of the plastic lined steel pipe and a flange part having a shape and rigidity enabling attachment, then close fitting to the end while completely covering the end face of the plastic lined steel pipe, the outer surface of the cylindrical part being provided with circumferential grooves, the material being a high corrosion resistance metal, and the inner surface of the flange part of the corrosive protection core having a rubber ring closely fit to it, and a method of production of the same.
Abstract:
A method of lining a pipe conduit to provide superior corrosion resistance. A flexible lining hose, having a resin absorbent layer which has been introduced with a volume of high strength resin, is first positioned inside of the conduit. The lining hose is then expanded into contact with the inner diameter of the conduit by inverting a calibration hose. The calibration hose has an impermeable membrane and a layer of resin absorbent material that has been introduced with a volume of corrosion resistant resin. The calibration hose is inverted by use of fluid pressure inside the lining hose, the fluid pressure being exerted against the impermeable membrane of the calibration hose. The resin layers are then cured by the application of a heated fluid until the lining hose and the calibration hose form a unitary rigid self supporting liner.