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Method for pressurising inner flow space of flexible pipe intended for transporting hydrocarbons

A technology for internal space and flexible pipes, applied in the direction of applying stable tension/pressure to test material strength, using liquid/vacuum for liquid tightness measurement, pipes, etc., can solve the problem of cracks and loss of polymer sheath sealing And other issues

Active Publication Date: 2018-07-17
TECH FRANCE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These voids and / or cracks can lead to cracks and loss of the seal of the polymer jacket

Method used

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  • Method for pressurising inner flow space of flexible pipe intended for transporting hydrocarbons
  • Method for pressurising inner flow space of flexible pipe intended for transporting hydrocarbons
  • Method for pressurising inner flow space of flexible pipe intended for transporting hydrocarbons

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Experimental program
Comparison scheme
Effect test

Embodiment

[0169] A pressurized test (n=1) with two pressurized holds was performed with three different fluids whose properties, densities and viscosities are given in Table 1.

[0170]

[0171] Table 1: Density and Kinematic Viscosity of Three Tested Fluids

[0172] Three identical flexible pipes ST 63.60103 (Technip company) were used:

[0173] - The flexible pipe has from the outside to the inside of the flexible pipe:

[0174] - an outer sealing polymer sheath 10,

[0175] - one or more tensile armor layers 12, 14,

[0176] - a pressure arch 18,

[0177] - a low plasticized PVDF ( TP22) made of inner sealing polymer sheath 20 (with an inner diameter of 77.50 mm), and

[0178] - a metal bracket 22,

[0179]- The flexible pipe (with ends) has an initial length of 5.67m, an inner diameter of 2.5", an outer diameter of 142mm, and is designed for a high pressure (702 bar) and a "Factory Acceptance Test" (FAT) pressure of 1054 bar.

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Abstract

The present invention relates to a method for pressurising the inner flow space of an underwater flexible pipe intended for transporting hydrocarbons, which includes the following steps: a) providinga flexible pipe which includes a reinforcement layer made up of a short-pitch winding of at least one metal wire with non-contiguous turns around a thermoplastic polymer sheath defining an inner space; b) filling the inner space of the flexible pipe with an oil; c) increasing the inner pressure Pi of the flexible pipe to at least 10 MPa, the inner pressure being exerted by said oil; and then d) maintaining the inner pressure Pi of the flexible pipe at a pressure of at least 10 MPa for a time D of at least one minute, characterised in that said oil has a kinematic viscosity at 40 DEG C, measured according to the ASTM D445 standard, of more than 10 mm2 / s. The method makes it possible to reduce or even to prevent the appearance of cavitations and cracks on the polymer sheath.

Description

technical field [0001] The present invention relates to a pressurization method for pressurizing the internal flow space of a flexible pipe for conveying hydrocarbons in deep water. Background technique [0002] Flexible pipe can be used at great depths, typically up to a depth of 3000 metres. Flexible pipes can transport fluids, especially hydrocarbon fluids, whose temperature usually reaches 130 °C, and may even exceed 150 °C, and the internal pressure can reach 100 MPa (1000 bar), or even 150 MPa (1500 bar). [0003] Flexible pipes for conveying hydrocarbons generally have a reinforcement layer and a polymeric sheath from the outside of the pipe to the inside. [0004] A polymer jacket ensures the tightness of the tube. The constituent materials of the polymer sheath must be chemically stable and mechanically resistant to the fluid being conveyed and its characteristics (composition, temperature and pressure). The material of the polymer sheath must combine the charact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L11/08E21B47/10G01M3/28G01N3/12
CPCF16L11/08G01M3/04G01M3/28F16L11/081G01M3/2815B29C48/09G01N3/12B29C53/582F16L11/083
Inventor T·爱泼斯坦N·布吕塞勒-迪庞德X·勒费布尔
Owner TECH FRANCE SA