HIGH-PRESSURE PIPE ELEMENT MADE OF A HOODED TUBE

• US 20030024587A1
• Filed: 07/25/2002
• Published: 02/06/2003
• Est. Priority Date: 08/01/2001
• Status: Active Grant

• Current Assignee: Institut Francais Du Petrole (IFP Energies Nouvelles)
• Original Assignee: Institut Francais Du Petrole (IFP Energies Nouvelles)
• Inventors: Schaeffner, Pierre, Blois, Christophe, Guesnon, Jean, Gaillard, Christian
• Granted Patent: US 6,536,480 B2
• Time in Patent Office: Days
• US Class Current: 138/172
• CPC Class Codes: F16L 13/04 with arrangements for preventing overstressing
• CPC Class Codes: F16L 9/02 of metal F16L9/16 - F16L9/22 take precedence

Abstract

High-pressure pipe element made of a hooped tube for making lines referred to as kill lines and choke lines that equip oil production installations, notably offshore. The high-pressure pipe element is an assembly consisting of two connections (3) and (4) respectively welded to the two ends of a metallic tube (1). The metallic assembly is hooped. Hooping (2) covering tube (1) comprises a sufficient number of hooping layers to withstand a determined internal pressure. Transition zones (5) and (7) in the vicinity of the welds comprise additional hooping layers.

Claims

1. A high-pressure pipe element comprising at least one hooping layer on a metalliccore, characterised in that said core consists of a main part to which two connection means are welded at each end, in that said main part comprises a number of hooping layers for inducing a determined prestress in said core, and in that said pipe comprises additional hooping layers in a zone stretching on either side of the two welds.

2. A pipe element as claimed in claim 1, wherein said additional hooping layers stretch over at least 50 mm on said main part.

3. A pipe element as claimed in any one of claims 1 and 2, wherein ends of said connection means are not hooped and have a sufficient thickness to withstand at least the same internal pressure as the hooped main part.

4. A pipe element as claimed in claim 3, wherein the outer surface of the connection means forms a cone between said main part and each one of said ends.

5. A pipe element as claimed in claim 4, wherein said cones are covered at least partly by the additional hooping layers.

6. A pipe element as claimed in any one of the previous claims, wherein said element is coated over the total outer surface thereof with a protective glass fiber layer embedded in a coloured polyamide matrix.

7. Use of a pipe element as claimed in any one of the previous claims for manufacturing an auxiliary line of a drilling riser.

8. Use as claimed in claim 7, wherein said auxiliary line is one of the following lines:

kill line, choke line, booster line and mud return line.