# US 8,061,739 B2 · Thermal insulation device of a screwed junction

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- Number: US 8,061,739 B2
- Document ID: US8061739B2
- Status: Granted
- Kind: B2
- Application number: 12/285,410
- Filed: 2008-10-03
- Published: 2009-04-16
- Granted: 2011-11-22
- Earliest claimed: 2007-10-03
- Assignees: Majus
- Inventors: Philippe Marchal
- Web page: https://patentgrep.com/patent/US8061739B2

## CPC

- F16L 59/182: {Joints with sleeve or socket}
- E21B 17/042: Threaded
- E21B 36/003: {Insulating arrangements}
- F16L 39/005: {for concentric pipes}
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

## Abstract

A thermal insulation device of a screwed junction between two sections of pipe comprising an outer pipe surrounding an inner pipe between which thermal insulation material is positioned, the inner pipes being assembled together by the screwed junction, one section delimiting a male portion and the other delimiting a female portion, the portions being fitted together to delimit the screwed junction, wherein the male portion comprises the inner pipe and a tubular part connected thereto, the diameter of the tubular part being less than that of the outer pipe, and wherein the female portion comprises a part of the outer pipe and an intermediate tubular part connecting the inner pipe to the outer pipe, the inner diameter of the intermediate part being greater than the outer diameter of the tubular part of the male portion, the thermally insulating material being inserted between the outer pipe and the intermediate part.

## Claims

### Claim 1

A thermal insulation device comprising a screwed junction between two sections of pipe, wherein each of the two sections of pipe comprises:
an outer pipe surrounding an inner pipe between which thermal insulation material is positioned,
said inner pipe of each said section being assembled together by said screwed junction, one of said two sections delimiting a male portion and the other of said sections delimiting a female portion, said two portions being fitted into one another in order to delimit said screwed junction;
wherein said male portion comprises:
said inner pipe,
a narrowed tubular part connected to said inner pipe,
a diameter of said narrowed tubular part being less than a diameter of said outer pipe, said male portion incorporating an insulating material;
wherein said female portion comprises:
a part of said outer pipe,
an intermediate tubular part connecting said inner pipe to said outer pipe,
an inner diameter of said intermediate tubular part being greater than the outer diameter of said narrowed tubular part of said male portion; and
a thermally insulating material being inserted between said part of the outer pipe and said intermediate tubular part.

### Claim 2 (depends on 1)

A thermal insulation device according to claim 1, wherein an end of said outer pipe is welded, at said male portion, to said inner pipe.

### Claim 3 (depends on 1)

A thermal insulation device according to claim 1, wherein a first end of said intermediate tubular part is welded to said outer pipe and a second end of said intermediate tubular part is welded to said inner pipe.

### Claim 4 (depends on 3)

A thermal insulation device according to claim 3, wherein said thermal insulation material inserted between said two inner pipes and outer pipes is identical to the thermal insulation material inserted at said male and female portions, an enclosure formed by said inner pipes and outer pipes thus constituting a continuous space.

### Claim 5 (depends on 4)

A thermal insulation device according to claim 4, wherein said thermal insulation material is constituted by a micro-porous material or a multilayered insulation material made of reflective sheets in a vacuum.

### Claim 6 (depends on 1)

A thermal insulation device according to claim 1, wherein said female portion and said male portion are each of a length that is in a range of 2 to 20% of a full length of one said pipe section.

### Claim 7 (depends on 1)

A thermal insulation device according to claim 1, wherein said thermal insulation material inserted between said two inner pipes and outer pipes is identical to the thermal insulation material inserted at said male and female portions, an enclosure formed by said inner pipes and outer pipes thus constituting a continuous space.

### Claim 8 (depends on 1)

A thermal insulation device according to claim 1, wherein said thermal insulation material is constituted by a micro-porous material or a multilayered insulation material made of reflective sheets in a vacuum.