Use of a conduit pipe for producing a duct laid in water

Patent metadata

Field	Value
Publication number	US-10072786-B2
Application number	US-201013202338-A
Country	US
Kind code	B2
Filing date	Jan 20, 2010
Priority date	Feb 19, 2009
Publication date	Sep 11, 2018
Grant date	Sep 11, 2018

Abstract

A metal conduit pipe, which is covered with an extruded layer made of polyamide molding compound, is used to produce a duct laid in water, wherein in the course of laying the duct, the coating is exposed to a shearing pressure load and/or a bending load due to laying method selected.

First claim

The invention claimed is:

1. A method of laying a pipeline, the method comprising:
laying a coated metallic pipe comprising an extruded coating layer such that the extruded coating layer is subjected to a shearing pressure load and a flexural load,
wherein the extruded coating layer comprises a polyamide molding composition,
the coated metallic pipe has been wound up for transport and is unwound prior to, or during, the laying of the coated metallic pipe, or the coated metallic pipe is laid by a J-lay method or by a S-lay method,
a viscosity of the polyamide molding composition according to ASTM D 4440-3 is at least 2000 Pa·s at 240° C. using a shear rate of 0.1 sec −1 ,
the coated metallic pipe further comprises at least one further layer between a metallic pipe of the coated metallic pipe and the extruded coating layer, and
the at least one further layer is at least one layer selected from the group consisting of:
a ceramic layer; a primer layer; a layer made of a polyolefin bearing at least one functional group; an adhesion-promoter layer; and a textile reinforcement in the form of woven or mats.

2. The method of claim 1 , wherein an external diameter of the coated metallic pipe is from 25 to 1000 mm.

3. The method of claim 1 , wherein a relative solution viscosity η rel of the polyamide molding composition in the extruded coating layer is at least 1.8 to ISO 307.

4. The method of claim 1 , wherein the extruded coating layer is applied by
a) mixing the polyamide moulding composition with an additive that increases molecular weight to form a premix; then
b) extruding the coating layer with the premix.

5. The method of claim 4 , wherein the additive a compound with at least two carbonate units.

6. The method of claim 1 , wherein the extruding coating layer has a thickness of at least 1.0 mm.

7. A method of laying a pipeline, the method comprising:
laying a coated metallic pipe comprising an extruded coating layer such that the extruded coating layer is subjected to a shearing pressure load or a flexural load, wherein the extruded coating layer comprises a polyamide molding composition,
the coated metallic pipe further comprises at least one further layer between a metallic pipe of the coated metallic pipe and the extruded coating layer, and
the at least one further layer is at least one layer selected from the group consisting of: a ceramic layer; a primer layer; a layer made of a polyolefin bearing at least one functional group; an adhesion-promoter layer; and a textile reinforcement in the form of woven or mats.

8. The method of claim 1 , wherein the viscosity of the polyamide molding composition according to ASTM D 4440-3 is at least 2300 Pa·s at 240° C. using a shear rate of 0.1 sec −1 .

9. The method of claim 1 , wherein the viscosity of the polyamide molding composition according to ASTM D 4440-3 is at least 3000 Pa·s at 240° C. using a shear rate of 0.1 sec −1 .

10. The method of claim 1 , wherein the viscosity of the polyamide molding composition according to ASTM D 4440-3 is at least 5000 Pa·s at 240° C. using a shear rate of 0.1 sec −1 .

11. The method of claim 1 , wherein the viscosity of the polyamide molding composition according to ASTM D 4440-3 is at least 8000 Pa·s at 240° C. using a shear rate of 0.1 sec −1 .

12. The method of claim 1 , wherein the coated metallic pipe has been wound up for transport and is unwound prior to, or during, the laying of the coated metallic pipe.

13. The method of claim 1 , wherein the coated metallic pipe is laid by a J-lay method.

14. The method of claim 1 , wherein the coated metallic pipe is laid by a S-lay method.

15. The method of claim 1 , wherein the at least one further layer is at least one layer selected from the group consisting of a ceramic layer and a textile reinforcement in the form of woven or mats.

16. The method of claim 7 , wherein the at least one further layer is at least one layer selected from the group consisting of: a ceramic layer; a primer layer; a layer made of a polyolefin bearing at least one functional group; and an adhesion-promoter layer.

17. The method of claim 1 , wherein the at least one further layer is a ceramic layer.

18. The method of claim 1 , wherein a layer arrangement of the coated metal pipe is selected from the group consisting of:
metal/ceramic layer/polyamide layer;
metal/ceramic layer/primer layer/polyamide layer;
metal/ceramic layer/primer layer/adhesion promoter/polyamide layer;
metal/primer layer/polyamide layer;
metal/primer layer/adhesion promoter/polyamide layer; and
metal/primer layer/polyolefin layer/polyamide layer.

Assignees

• Dowe Andreas
• Goering Rainer
• Kocks Hans Juergen
• Winkels Joern
• Evonik Degussa Gmbh
• Salzgitter Mannesmann Line Pipe Gmbh

Inventors

• Dowe Andreas
• Goering Rainer
• Kocks Hans-Juergen
• Winkels Joern

Classifications

• Y10T137/0318

  Processes · CPC title

• C09D177/00

  Coating compositions based on polyamides obtained by reactions forming a carboxylic amide link in the main chain (based on polyhydrazides C09D179/06; based on polyamide-imides C09D179/08); Coating compositions based on derivatives of such polymers · CPC title

• F16L57/06

  against wear (F16L57/04 takes precedence) · CPC title

• F16L58/109 Primary

  the coating being an extruded layer · CPC title

• F16L1/12

  Laying or reclaiming pipes on or under water · CPC title