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Multilayer pipe with inner and outer layers of fluoropolymeric material

A polymer and multi-layer pipe technology, applied in the direction of pipes, pipes/pipe joints/fittings, hoses, etc., can solve the problem that the pipe does not have satisfactory permeability

Inactive Publication Date: 2006-11-29
PETRO TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In the embodiment of multilayer pipes, the pipes described in the prior art do not have the permeability properties required by the planning regulations

Method used

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  • Multilayer pipe with inner and outer layers of fluoropolymeric material
  • Multilayer pipe with inner and outer layers of fluoropolymeric material

Examples

Experimental program
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Effect test

example 1

[0091] If the main pipe diameter is 32 mm, the construction is usually as follows:

[0092] Inner fluoropolymer, such as modified PVDF, with a thickness of 0.3 mm;

[0093] The base layer, such as PA12, has a thickness of 0.3 mm;

[0094] Outer layer, such as modified PVDF, with a thickness of 2.5 mm

[0095] The second tube may be identical to the tube, snugly bonded to its top surface, or it may be a single layer of fluoropolymer.

example 2

[0097] In this example, assuming a pipe diameter of 32 mm, the outer fluorinated layer is formed by fluorinating polyethylene. Then its structure is usually:

[0098] The inner fluoropolymer barrier layer is modified PVDF with a thickness of 0.3mm;

[0099] The central core was polyethylene, 2.7 mm thick, the outer surfaces of which were fluorinated as described above.

example 3

[0101] Consistent with Example 2, there is a tie layer between the PVDF layer and the PE layer. Then its structure is usually:

[0102] The inner fluoropolymer barrier layer is modified PVDF with a thickness of 0.3mm;

[0103] Adhesive layer, such as Adheflon (supplied by AtoFina), with a thickness of 0.1 mm;

[0104] The central core was polyethylene, 2.7 mm thick, the outer surfaces of which were fluorinated as described above.

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Abstract

A flexible multi-layer pipe assembly comprising, in a radial direction from the inside to the outside: (i) an inner barrier layer formed from a first fluoropolymer; (ii) an intermediate or core layer formed from a polymer or blend of polymers; (iii) an outer barrier layer formed from a second fluoropolymer.

Description

technical field [0001] The present invention relates to pipes suitable for conveying fluids. In particular, the invention can be applied in pipes having a multilayer structure and a very low permeability to fuels such as petroleum and to various additives used in said fuels. [0002] Although the present invention is primarily applicable to double-walled pipe assemblies used in the petroleum, chemical and natural gas industries, it should be understood that such pipe assemblies may also be used in applications in connection with any type of installation as described below, wherein Hazardous fluids (which can be liquids, gases or vapors) in a device can cause serious contamination and environmental hazards if they escape undetected into the surrounding environment for a long time. When eventually discovered, such contamination can be difficult and expensive to remove. Background technique [0003] Conventional underground fluid piping systems, such as those used in environm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B1/08F16L9/12
CPCB32B1/08F16L2011/047F16L9/121Y10T428/1386Y10T428/1352F16L11/04
Inventor 约翰·亚历山大·布德里马克·库克
Owner PETRO TECH LTD