Abstract:
The present invention relates to a preformed liner of tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer adhered to the surface of a pipe, and in particular, an oil well pipe, without the need for either a primer layer or an adhesive. The liner comprises an effective amount of metal powder which provides adhesion between the liner and the surface of the pipe. The present invention also relates to a process for making such pipe, where in a preferred embodiment, the liner is co-extruded to form an inner layer and an outer layer. This co-extrusion embodiment is particularly useful in applications where high purity is necessary. In this case, the inner layer comprises an effective amount of metal powder and the outer layer is pure tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer.
Abstract:
The present invention relates to a preformed liner of tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer adhered to the surface of a pipe, and in particular, an oil well pipe, without the need for either a primer layer or an adhesive. The liner comprises an effective amount of metal powder which provides adhesion between the liner and the surface of the pipe. The present invention also relates to a process for making such pipe, where in a preferred embodiment, the liner is co-extruded to form an inner layer and an outer layer. This co-extrusion embodiment is particularly useful in applications where high purity is necessary. In this case, the inner layer comprises an effective amount of metal powder and the outer layer is pure tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer.
Abstract:
The present invention relates to a preformed liner of tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer adhered to the surface of a pipe, and in particular, an oil well pipe, without the need for either a primer layer or an adhesive. The liner comprises an effective amount of metal powder which provides adhesion between the liner and the surface of the pipe. The present invention also relates to a process for making such pipe, where in a preferred embodiment, the liner is co-extruded to form an inner layer and an outer layer. This co-extrusion embodiment is particularly useful in applications where high purity is necessary. In this case, the inner layer comprises an effective amount of metal powder and the outer layer is pure tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer.
Abstract:
The present invention relates to a pipe (1) comprising at least two pipe elements (11, 12) having internal liners of plastic material (2), the pipe elements being assembled end to end, in which the ends of the two pipe elements are welded (5) together and in which the ends of the internal liners (2) of plastic material of each of the pipe elements are joined together by means of a tubular junction sleeve (3) of material that withstands corrosion and that co-operate with the ends (2a, 2b) of the liners by mutual engagement via a notched surface (32), said liner ends (2) presenting reduced thickness (2a, 2b) and being bonded against the steel wall of said pipe by adhesive (4a, 4b).
Abstract:
The present invention relates to a process for adhering a preformed polymer liner to the surface of a pipe by induction heating the pipe. The liner may comprise a fluoropolymer. The liner may be applied either to the interior surface or the exterior surface of the pipe. The invention is particularly useful for adhering a liner to the interior surface of an oil well pipe. Thus with the induction heating process of present invention, it is possible to adhere a preformed liner to the interior surface of an oil well pipe which is capable of reducing-to-eliminating the deposition (buildup) of one or more of the asphaltenes, paraffin wax, and inorganic scale on the interior surface of the oil pipe. Preferably, this reduction is at least 40%, preferably at least 50% or more, for at least one of these materials as compared to the unlined oil pipe, and more preferably at least 40% for all of them. In one preferred embodiment of the process, the peel strength of the preformed liner adhered to the surface of the pipe is at least ten pounds force per inch (10 lbf/in). In other preferred embodiments of the process, either a primer or an adhesive aid is used in adhering the preformed liner to the surface of the pipe.
Abstract:
The present invention relates to a preformed liner adhered to the surface of a pipe, and in particular, an oil well pipe, by an adhesive. The liner comprises a polymer, preferably a fluoropolymer. The present invention also relates to a process for adhering the preformed liner to the interior surface of a pipe, and in particular by applying adhesive to the preformed liner. The liner is preferably treated prior to applying the adhesive. A suitable treatment includes etching. The pipe is heated to adhere the preformed liner to the interior surface of the pipe, without buckling the liner. The interior surface of the preformed fluoropolymer liner reduces the deposition of at least one of 1) asphaltenes, 2) paraffin wax, and 3) inorganic scale by at least 40% as compared to the interior surface of the oil pipe without the preformed liner being present.
Abstract:
Methods and apparatus for detecting wear in a liner. In one embodiment of the present invention, an electrically conductive wire is placed on or near the outside surface of the liner and the electrical resistance in the electrically conductive wire is measured to determine whether the wire has worn through. In another embodiment of the present invention, the temperature measured by a temperature measuring device, such as a thermocouple, is monitored over time to estimate wear in the liner.
Abstract:
The present invention relates to a vessel, in particular a pipe, especially an oil pipe, having a preformed film adhered onto the interior surface of the pipe, the interior surface of the preformed film reducing the deposition of at least one of asphaltenes, paraffin wax, and inorganic scale by at least 40% as compared to the interior surface of said oil pipe without said preformed film being present. In a preferred embodiment, the preformed film is adhered to the interior surface of the pipe with a primer layer with an optional barrier layer between the primer layer and the preformed film.
Abstract:
A laminate for lining a passage, which is entirely or partially surrounded by walls, above or under the ground, which laminate comprises at least one layer of a reinforcement (4) of continuous fibre, a curable resin (5) and a plastic sheet or plastic film (3) which is on the inside of the laminate when the laminate is inserted into the passage (10) which shall be lined. In order to give the laminates corrosion durability and flexibility which stand on a par with the strength of the laminate so that not anyone of these parameters will determine the life length of the lining, there is arranged a mat (8) of fibres between the inner film (3) and the reinforcement (4) which mat on its side which is turned to the inner film (3) has cut fibres (13), and which together with its cut fibres can absorb resin for concentration of curable resin to the inner surface of the cured laminate.
Abstract:
A method and apparatus are shown for lining a tubular member with an elastomeric liner having an outside diameter which is initially greater than the inside diameter of the tubular member. A series of downsizing rollers reduce the outside diameter of the liner a preselected amount. A series of shaping rollers form the downsized liner into an ellipse, thereby allowing the downsized liner to be guided around bends and turns into the interior of the tubular member. After insertion, the liner is allowed to expand to substantially its original outside diameter to secure the liner within the tubular member.