Multilayer pipe with polyamide layer

Patent metadata

Field	Value
Publication number	US-9551441-B2
Application number	US-201414225842-A
Country	US
Kind code	B2
Filing date	Mar 26, 2014
Priority date	Mar 28, 2013
Publication date	Jan 24, 2017
Grant date	Jan 24, 2017

Abstract

A pipe or pipeline for use in the oil and gas industry for conveying lines, collection pipelines and transport pipelines with reduced operating risk and increased lifetime is provided. The pipe contains: a) an external reinforcement layer and b) an internal liner which comprises securely bonded to one another: I) a layer made of a thermoplastic molding composition selected from a polyolefin molding composition and a fluoropolymer molding composition and II) a layer made of a polyamide molding composition, wherein not only the polyamide molding composition but also the molding composition of the layer according to I) in essence comprises no blend component which is composed of another polymer and which has disperse distribution in the molding composition.

First claim

The invention claimed is:

1. A pipe, comprising:
a) an external reinforcement layer and
b) an internal liner which comprises:
I. a layer of a thermoplastic moulding composition selected from a polyolefin moulding composition and a fluoropolymer moulding composition and
II. a layer of a polyimide moulding composition,
wherein
the layers I and II are securely and directly adhered to one another,
each of the layers I and II have a polymer composition comprising only homogeneously miscible polymers, and
adhesion between the layers I and II is at least 1.0 N/mm, determined according to DIN 53357.

2. The pipe according to claim 1 , wherein the external reinforcement layer is a metal pipe.

3. The pipe according to claim 2 , wherein the liner is adhesive-bonded to the metal pipe.

4. The pipe according to claim 1 , wherein the pipe is an unbonded flexible pipe having an external reinforcement layer comprising helically arranged steel wires, steel profiles or steel tapes.

5. The pipe according to claim 4 ,
wherein the external reinforcement layer comprises at least two external layers,
wherein at least one external layer has a structure that withstands the internal pressure, and at least one external layer has a structure that withstands tensile forces.

6. The pipe according to claim 4 , wherein
the external reinforcement layer further comprises an exterior sheathing in the form of a pipe or hose made of a thermoplastic moulding composition or of an elastomer.

7. The pipe according to claim 1 , wherein
the external reinforcement layer comprises at least one layer having fibres and/or wire embedded into a polymeric matrix.

8. The pipe according to claim 7 , wherein
an exterior surface of the inner liner is adhesive-bonded or welded to an inner surface of the external reinforcement layer.

9. The pipe according to claim 1 , wherein the inner liner comprises:
an internal fluoropolymer layer; and
an external polyamide layer;
wherein the moulding composition of the fluoropolymer layer is adhesion-modified or the fluoropolymer layer and the polyamide layer are bonded to one another by an adhesion-promoter layer.

10. The pipe according to claim 1 , wherein the inner liner comprises:
an internal polyolefin layer; and
an external polyamide layer;
wherein the moulding composition of the polyolefin layer is adhesion-modified or the polyolefin layer and the polyamide layer are bonded to one another by an adhesion-promoter layer.

11. The pipe according to claim 1 , wherein the inner liner comprises:
an internal polyamide layer; and
an external polyolefin layer;
wherein the moulding composition of the polyolefin layer is adhesion-modified or the polyolefin layer and the polyamide layer are bonded to one another by an adhesion-promoter layer.

12. The pipe according to claim 1 , wherein the polyamide of the polyamide moulding composition comprises amino groups and a content of the amino groups is at least 15 meq/kg of the polyamide.

13. A pipeline which comprises the pipe according to claim 1 .

14. The pipeline according to claim 13 , which is a conveying pipeline, a collection pipeline or a transport pipeline for crude oil or natural gas.

15. The pipeline according to claim 13 , which is a pipeline for supercritical CO 2 .

Assignees

• Dowe Andreas
• Franosch Juergen
• Berger Jan
• Behrens Claudia
• Evonik Degussa Gmbh

Inventors

• Dowe Andreas
• Franosch Juergen
• Berger Jan
• Behrens Claudia

Classifications

• F16L9/14 Primary

  Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups (F16L9/16 - F16L9/22 take precedence) · CPC title

• B32B27/32 Primary

  comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} · CPC title

• B32B2597/00

  Tubular articles, e.g. hoses, pipes · CPC title

• B32B27/34

  comprising polyamides · CPC title

• B32B1/08

  Tubular products · CPC title