The invention relates to production of long spiral-welded large polymer products, as required for pipelines production, chemical, oil and gas and petrochemical industries, agricultural complex and utility services. The object of the invention is to create variants of spiral-welded polymer product with a cellular wall, having the internal or external, or internal and external uniform smooth walls with little material consumption, weight and cost. It should allow making products on site due the use of a thin-walled, lightweight, flexible profile. The object is solved owing to fact that a long hollow thermoplastic profile is used in spiral-welded polymer products, wherein the cross-section of the profile has a form of a closed geometric figure with a convex part having essentially the semi-ring shape and flat part that are connected each other, forming the convex and flat parts of the external surface of the profile, respectively.

A sensor for measuring a characteristic of a length of a pipeline, wherein the sensor comprises a sensor length arranged to extend helically along the pipeline length; and the sensor length extends parallel to a ridge extending radially from a layer of a wall of the pipeline length. A length of pipeline with an integrated sensor length may be constructed by bending a first strip of material into a helical form that comprises a first ridge; bending a second strip of material into a helical form, wherein the second strip of material comprises a second ridge; forming a tubular shape from the first and second strips of material, wherein the first strip of material at least partially surrounds the second strip of material, and the first ridge engages the second ridge; and wrapping a sensor length about the tubular shape.

A sensor for measuring a characteristic of a length of a pipeline, wherein the sensor comprises a sensor length arranged to extend helically along the pipeline length; and the sensor length extends parallel to a ridge extending radially from a layer of a wall of the pipeline length. A length of pipeline with an integrated sensor length may be constructed by bending a first strip of material into a helical form that comprises a first ridge; bending a second strip of material into a helical form, wherein the second strip of material comprises a second ridge; forming a tubular shape from the first and second strips of material, wherein the first strip of material at least partially surrounds the second strip of material, and the first ridge engages the second ridge; and wrapping a sensor length about the tubular shape.

The present invention relates to a hose line (1) for transporting abrasive media with an electrically conductive reinforcing element (5) running in or on the hose wall (2) and extending in the hose direction (6), wherein an insert (7) made of electrically conducting material is at least partially embedded in the hose wall (2) and extends in the hose direction (6) at a distance from the reinforcing element (5).

It is possible to prevent a tip portion of a guide portion in a spiral pipe-forming apparatus allowing an inner periphery restriction body to be omitted from colliding a peripheral surface portion of a non-circular existing pipe. A non-circular guide portion (73) is provided so as to be rotatable with respect to an apparatus frame (3a) around a rotary axis (32). The guide portion (73) is applied to a peripheral surface of a preceding spiral pipe portion (91). An acting portion (41) acts such that the guide portion (73) follows the peripheral surface of the existing pipe (1).

It is possible to prevent a tip portion of a guide portion in a spiral pipe-forming apparatus allowing an inner periphery restriction body to be omitted from colliding a peripheral surface portion of a non-circular existing pipe. A non-circular guide portion (73) is provided so as to be rotatable with respect to an apparatus frame (3a) around a rotary axis (32). The guide portion (73) is applied to a peripheral surface of a preceding spiral pipe portion (91). An acting portion (41) acts such that the guide portion (73) follows the peripheral surface of the existing pipe (1).

Both diameter expansion and contraction control and fitting stabilization are achieved at the same time in a pipe end release-type pipe-forming apparatus having a non-inner periphery restriction structure. A driving part (10) provided in an apparatus frame (30) of a pipe-forming apparatus (3N) presses an unformed following strip portion (92) of the strip member (90). A reverse side guide portion (83) is engaged with a pipe end portion (91e) of a preceding spiral pipe portion (91) from a reverse side. A face side guide portion (82) is engaged with the pipe end portion (91e) from a face side. The face side guide portion (82) is shifted to the propulsion rear side beyond the reverse side guide portion (83). The following strip portion (92) is extruded from the driving part (10) toward an inter-guide clearance (84) between the reverse side guide portion (83) and the face side guide portion (82). Preferably, the driving part (10) is position-adjustably attached to the guide portions (83), (82) or the apparatus frame (30) via a position adjustment mechanism (31a).

Both diameter expansion and contraction control and fitting stabilization are achieved at the same time in a pipe end release-type pipe-forming apparatus having a non-inner periphery restriction structure. A driving part (10) provided in an apparatus frame (30) of a pipe-forming apparatus (3N) presses an unformed following strip portion (92) of the strip member (90). A reverse side guide portion (83) is engaged with a pipe end portion (91e) of a preceding spiral pipe portion (91) from a reverse side. A face side guide portion (82) is engaged with the pipe end portion (91e) from a face side. The face side guide portion (82) is shifted to the propulsion rear side beyond the reverse side guide portion (83). The following strip portion (92) is extruded from the driving part (10) toward an inter-guide clearance (84) between the reverse side guide portion (83) and the face side guide portion (82). Preferably, the driving part (10) is position-adjustably attached to the guide portions (83), (82) or the apparatus frame (30) via a position adjustment mechanism (31a).

The invention relates to a profile made from a polymer material comprising a linear low-density polyethylene and a very low-density polyethylene having a specific range of flexural modulus, and to a flexible hose made from said profile. It is part of the invention that the profile wall thickness of the flexible hose is reduced while a sufficient and efficacious value for the flex life is maintained and while a sufficiently high memory is maintained, when compared to the common wall thickness of current hoses, such that the hose of the invention has a reduced weight while the durability and fatigue resistance of the hose is maintained at a sufficiently high value.

Helically winding an extruded web to form a wall of a heated hose about a central axis, extruding a bead of plastics material around a heating wire such that the extruded bead comprises the heating wire at a first location within a cross-section of the extruded bead, helically winding the extruded bead onto the wall of the hose to provide a support helix, and exerting tension on the heating wire to draw down the heating wire toward the central axis such that the heating wire migrates radially inward from the first location to a second location within the cross-section of the extruded bead.