Flexible pipe and method of manufacturing same
First Claim
Patent Images
1. A flexible pipe comprising:
- a tubular member defining a longitudinal passage;
a single metal strip continuously helically wound over the tubular member to define a plurality of radially spaced, integral windings, the strip having a constant thickness throughout its length and width;
a cross section of the strip being preformed prior to being wound over the tubular member and having a convex portion comprising a first, curved bent region at an edge of the strip and a straight portion extending from the first bent region to a curved, bent portion of the strip, and a concave portion comprising a second, curved bent region at the other edge of the strip and a straight portion extending from the second bent region to the bent portion of the strip, said convex portion and said concave portion being integrally formed;
the convex portion of each winding of the strip overlapping a portion of the concave portion of one adjacent winding, and the concave portion of each winding being overlapped by the convex portion of another adjacent winding which is in a spaced relation to the one adjacent winding, to interlock the windings;
a layer of wires wrapped around the exterior of the metal strip; and
an outer sheath extending over the metal strip and the layer of wires.
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Accused Products
Abstract
A flexible pipe and a method of manufacturing same according to which the pipe is formed by multiple layers of different materials and suitable for use in subsea and land-based applications.
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Citations
18 Claims
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1. A flexible pipe comprising:
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a tubular member defining a longitudinal passage; a single metal strip continuously helically wound over the tubular member to define a plurality of radially spaced, integral windings, the strip having a constant thickness throughout its length and width; a cross section of the strip being preformed prior to being wound over the tubular member and having a convex portion comprising a first, curved bent region at an edge of the strip and a straight portion extending from the first bent region to a curved, bent portion of the strip, and a concave portion comprising a second, curved bent region at the other edge of the strip and a straight portion extending from the second bent region to the bent portion of the strip, said convex portion and said concave portion being integrally formed; the convex portion of each winding of the strip overlapping a portion of the concave portion of one adjacent winding, and the concave portion of each winding being overlapped by the convex portion of another adjacent winding which is in a spaced relation to the one adjacent winding, to interlock the windings; a layer of wires wrapped around the exterior of the metal strip; and an outer sheath extending over the metal strip and the layer of wires. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A flexible pipe made by a process comprising:
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providing a tubular member defining a longitudinal passage; providing a preformed metal strip having a constant thickness throughout its length and width and a cross section comprising a convex portion and a concave portion, the convex portion comprising a first bent edge portion and a substantially straight portion extending from the first edge portion to an intermediate bent portion of the strip, the concave portion comprising a second bent edge portion and a substantially straight portion extending from the second edge portion to the intermediate bent portion of the strip, said convex portion and said concave portion being integrally formed; helically winding the preformed metal strip over the tubular member to define a plurality of radially spaced, integral windings, wherein the convex portion of each winding of the strip overlaps a portion of the concave portion of one adjacent winding, and the concave portion of each winding is overlapped by the convex portion of another adjacent winding which is in a spaced relation to the one adjacent winding, to interlock the windings; and
placing an outer sheath over the helically wound metal strip. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A flexible pipe made by a process comprising:
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providing a tubular member defining a longitudinal passage; providing a preformed metal strip having a constant thickness throughout its length and width and a cross section comprising a raised substantially horizontal first portion extending from a first edge of the strip to a bent portion of the strip and a substantially horizontal second portion, formed integral with said raised first portion and said bent portion, and extending from the bent portion of the strip to a second edge the strip; helically winding the preformed metal strip over the tubular member to define a plurality of radially spaced, integral windings, wherein the raised first portion of each winding of the strip overlaps a portion of the second portion of one adjacent winding, and the second portion of each winding is overlapped by the raised first portion of another adjacent winding which is in a spaced relation to the one adjacent winding, to interlock the windings; and
placing an outer sheath over the helically wound metal strip. - View Dependent Claims (15, 16, 17, 18)
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Specification