GB2166065A - Insulated pipeline - Google Patents
Insulated pipeline Download PDFInfo
- Publication number
- GB2166065A GB2166065A GB08526492A GB8526492A GB2166065A GB 2166065 A GB2166065 A GB 2166065A GB 08526492 A GB08526492 A GB 08526492A GB 8526492 A GB8526492 A GB 8526492A GB 2166065 A GB2166065 A GB 2166065A
- Authority
- GB
- United Kingdom
- Prior art keywords
- insulated pipeline
- jacket
- coating
- corrosion
- resistant
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000011248 coating agent Substances 0.000 claims abstract description 18
- 238000000576 coating method Methods 0.000 claims abstract description 18
- 238000005260 corrosion Methods 0.000 claims abstract description 18
- 230000007797 corrosion Effects 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 12
- 230000009975 flexible effect Effects 0.000 claims abstract description 8
- 230000001681 protective effect Effects 0.000 claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 claims abstract 3
- 230000001413 cellular effect Effects 0.000 claims description 10
- 229920002635 polyurethane Polymers 0.000 claims description 8
- 239000004814 polyurethane Substances 0.000 claims description 8
- 229920001084 poly(chloroprene) Polymers 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 2
- 238000010422 painting Methods 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 238000004804 winding Methods 0.000 claims description 2
- 229920001971 elastomer Polymers 0.000 description 7
- 238000005299 abrasion Methods 0.000 description 5
- 238000009413 insulation Methods 0.000 description 5
- 239000013535 sea water Substances 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/10—Coatings characterised by the materials used by rubber or plastics
- F16L58/1054—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe
- F16L58/1081—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe the coating being a preformed pipe
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
- B29C70/72—Encapsulating inserts having non-encapsulated projections, e.g. extremities or terminal portions of electrical components
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/14—Arrangements for the insulation of pipes or pipe systems
- F16L59/143—Pre-insulated pipes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0012—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular thermal properties
- B29K2995/0015—Insulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
- B29L2023/22—Tubes or pipes, i.e. rigid
- B29L2023/225—Insulated
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Laminated Bodies (AREA)
Abstract
An insulated pipeline and a method of manufacturing it, the pipeline having around the pipe an inner coating of water-impermeable corrosion-resistant material and an outer jacket of heat-insulating protective material, whereby the pipeline is protected from heat loss, corrosion and mechanical damage. The coating and jacket are preferably flexible to facilitate laying of the insulated pipeline offshore.
Description
SPECIFICATION
Insulated pipeline
This invention relates to an insulated pipeline.
Pipelines for passage of fluid along the sea bed for example require both heat insulation and protection against mechanical damage. Hitherto insulation has been provided by cellular insulating material such as expanded PVC, while an outer protective coating of non-cellular polyurethane provides impact and abrasion resistance.
Further, it has been proposed to provide a corrosion-resistant coating on the pipeline itself.
According to the present invention there is provided an insulated pipeline having a continuous corrosion-resistant coating on its outer face and a jacket around the corrosion-resistant coating in the form of a non-circular flexible protective material which is also heat-insulating.
Preferably the protective, heat-insulating jacket is from 25 to 75 mm in thickness. Preferably also it is bonded to the corrosion-resistant coating.
The protective jacket may be formed by providing a mould around the pipeline or a section of the pipeline which is pre-coated with the corrosion-resistant material, filling the space between the mould and the coated pipe with uncured non-solid material or mix, and curing the material or mix to form the jacket within the mould. The mould can then be removed.
The corrosion-resistant coating may be from 4 to 10 mm thick for best results, and can be applied to the pipeline for example by spraying, painting, winding or moulding.
An embodiment of the present invention will now be described by way of example with reference to the accompanying drawing which is an end sectional view of an insulated pipeline of this invention.
Referring to the drawing, the pipeline of this embodiment of the invention has a steel pipe 1 for carrying oil, the pipe to be laid in use on the sea bed. If the pipe 1 were not protected from corrosion it would rust, with eventual failure of the pipe wall, so a corrosion-resistant sealing layer 2 is applied to the pipe 1 so as to envelope completely the pipe outer face.
The layer 2 consists of 6mm thick polychloroprene rubber which is sold under the Trade Mark
LINECOTE and is a flexible elastomer which is vulcanised and bonded to the pipe 1. The layer 2 provides a tough coating which is highly chemical and temperature resistant and impervious to moisture and sea water. It is also resistant to abrasion and has high tear and tensile strength, is highly resistant to ozone attack and flex cracking and has low temperature flexibility down to minus 30 degrees centigrade. It is resistant to oils, waxes and gases and most aliphatic hydrocarbons.
Around the corrosion-resistant layer 2 is a jacket 3 which provides both heat insulation and protection against mechanical damage. The jacket 2 consists of polyurethane which is 50 mm thick and which is based on a two-part polyurethane system having high abrasion and cut growth resistance, and excellent resistance to sea water.The physical properties of the material are as follows:
Hardness (IRHD) 84
Tensile strength (psi) min. 1850
Elongation at Break (%) min. 350
Tear Resistance (1 b/inch) min. 200
Specific Gravity 1.13
Taber Abrasion Resistance Loss/1000 cycles (mg) 100
Compression Set at 70 degrees centigrade 40
Volume Swell in Sea Water Typical % Change
Temperature 1 Week 2 Weeks 3 Weeks
4 degrees centigrade 5.16 6.10 6.44 38 degrees centigrade 3.19 3.50 3.08 70 degrees centigrade 3.74 3.74 3.32
The insulated pipeline of this embodiment of the invention is manufactured by rotationally extruding the LINECOTE polychloroprene rubber onto the cleaned outer face of the pipe 1 to provide the layer 2.The rubber is applied in a manner which ensures that the pipe outer face is completely covered by the layer 2 thereby to protect it totally from its environment.
The outer face of the pipe 1 is pre-cleaned and prepared for coating by shotblasting to a minimum SA 2.5 and applying a primer under controlled temperature and humidity conditions.
After vulcanising the polychloroprene rubber in a steam autoclave at 153 degrees centigrade and 60 psi a 100% rubber tear bond is obtained (i.e. The strength of the chemical bond is greater than the tensile and tear strength of the rubber).
The jacket 3 is applied to the outer face of the corrosion-resistant layer 2 by first forming a mould (not shown) around the coated pipe 1 which defines a space between the layer 2 and the mould corresponding to the intended volume and shape of the jacket 3. Polyurethane to form the jacket 3 is then injected from a two-part polyurethane mixing machine into the mould and allowed to cure to form the flexible, non-cellular jacket 3. The mould is then removed, leaving the insulated pipeline in the form shown in the drawing.
The pipeline of this embodiment thus has a continuous, non-cellular, flexible, corrosion-resistant, abrasion-resistant and impact-resistant heat-insulating coating formed by the layer 2 and the jacket 3. The cost of providing heat insulation by mean of the non-cellular polyurethane jacket 3 is considerably less than a corresponding jacket of cellular PVC or the like and, while the insulating properties are not as great as with a cellular jacket, the pipeline of this invention will find application in environments where a moderate degree of insulation is adequate.
The flexible nature of the polyurethane jacket 3 allows the pipeline to be laid by reel barge, lay barge, "J-lay" or mid-depth tow without damage to the jacket, and this again is of advantageous over cellular jackets which tend to be rigid and liable to cracking and therefore require special construction or laying techniques.
Modifications and improvements may be made without departing from the scope of the invention.
Claims (13)
1. An insulated pipeline having a continuous corrosion-resistant water-impermeable coating on its outer face and a jacket around and in contact with the corrosion-resistant coating, the jacket being in the form of a non-cellular protective material which is also heat-insulating.
2. An insulated pipeline according to Claim 1, wherein the heat-insulating jacket is from 25 to 75 mm in thickness.
3. An insulated pipeline according to Claim 1 or 2, wherein the heat-insulating jacket is of polyurethane.
4. An insulated pipeline according to any one of the preceding Claims, wherein the heatinsulating jacket is flexible.
5. An insulated pipeline according to any one of the preceding Claims, wherein the heatinsulating jacket is bonded to the corrosion-resistant coating.
6. An insulated pipeline according to any one of the preceding Claims, wherein the corrosionresistant coating is from 4 to 10 mm in thickness.
7. An insulated pipeline according to any one of the preceding Claims, wherein the corrosionresistant coating is of polychloroprene.
8. An insulated pipeline according to any one of the preceding Claims, wherein the corrosionresistant coating is flexible.
9. A method of manufacturing an insulated pipeline, comprising applying a continuous coating of corrosion-resistant water-impermeable material to a pipe, providing a mould around the coated pipe to define a space between the coating and the mould, introducing into the space uncured material which on curing provides non-cellular heat-insulating protective material, and curing the uncured material.
10. A method according to Claim 9, wherein the corrosion-resistant water-impermeable material is applied to the pipe by spraying, painting, winding or moulding.
11. A method of manufacturing an insulated pipeline substantially as hereinbefore described with reference to the accompanying drawing.
12. An insulated pipeline manufactured by the method according to any one of Claims 9, 10 and 11.
13. An insulated pipeline substantially as hereinbefore described with reference to and as shown in the accompanying drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08526492A GB2166065A (en) | 1984-10-27 | 1985-10-28 | Insulated pipeline |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB848427240A GB8427240D0 (en) | 1984-10-27 | 1984-10-27 | Insulated pipeline |
| GB08526492A GB2166065A (en) | 1984-10-27 | 1985-10-28 | Insulated pipeline |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8526492D0 GB8526492D0 (en) | 1985-12-04 |
| GB2166065A true GB2166065A (en) | 1986-04-30 |
Family
ID=26288386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08526492A Withdrawn GB2166065A (en) | 1984-10-27 | 1985-10-28 | Insulated pipeline |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2166065A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1989012199A1 (en) * | 1988-06-07 | 1989-12-14 | Regal Technology (U.K.) Ltd. | Material for and method of pipeline insulation |
| US4976490A (en) * | 1988-10-05 | 1990-12-11 | Ford Motor Company | Reinforced composite structure |
| GB2250934A (en) * | 1990-11-28 | 1992-06-24 | Textilver Sa | Foam lined tubes |
| WO2000073695A1 (en) * | 1999-05-26 | 2000-12-07 | Thermotite As | Steel tube with heat insulation for subsea pipelines and method of producing same |
| US6397895B1 (en) | 1999-07-02 | 2002-06-04 | F. Glenn Lively | Insulated pipe |
| WO2005031109A1 (en) * | 2003-09-30 | 2005-04-07 | Drag'n Skin International Inc. | A pipe assembly and a method for installation in a borehole |
| WO2007109382A2 (en) | 2006-03-20 | 2007-09-27 | Alcon, Inc. | Surgical cassette with bubble breaking structure |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1046218A (en) * | 1964-06-11 | 1966-10-19 | Standard Telephones Cables Ltd | Electric cable joints |
| GB1394579A (en) * | 1971-06-08 | 1975-05-21 | Rockwool As | Insulated concuit system for metal pipes for the transport of hot media |
| GB1457955A (en) * | 1974-02-15 | 1976-12-08 | Toyo Soda Mfg Co Ltd | Coated metallic pipe |
| GB1504645A (en) * | 1975-09-01 | 1978-03-22 | Toyo Soda Mfg Co Ltd | Polymer composition for coating metal pipes |
| GB1542333A (en) * | 1977-11-18 | 1979-03-14 | British Steel Corp | Coating of pipes |
| GB2081415A (en) * | 1980-08-04 | 1982-02-17 | Kabel Metallwerke Ghh | Flexible thermally insulated pipe and process for its manufacture |
| GB2097809A (en) * | 1981-05-06 | 1982-11-10 | Plascoat Uk Ltd | Coating metal articles |
-
1985
- 1985-10-28 GB GB08526492A patent/GB2166065A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1046218A (en) * | 1964-06-11 | 1966-10-19 | Standard Telephones Cables Ltd | Electric cable joints |
| GB1394579A (en) * | 1971-06-08 | 1975-05-21 | Rockwool As | Insulated concuit system for metal pipes for the transport of hot media |
| GB1457955A (en) * | 1974-02-15 | 1976-12-08 | Toyo Soda Mfg Co Ltd | Coated metallic pipe |
| GB1504645A (en) * | 1975-09-01 | 1978-03-22 | Toyo Soda Mfg Co Ltd | Polymer composition for coating metal pipes |
| GB1542333A (en) * | 1977-11-18 | 1979-03-14 | British Steel Corp | Coating of pipes |
| GB2081415A (en) * | 1980-08-04 | 1982-02-17 | Kabel Metallwerke Ghh | Flexible thermally insulated pipe and process for its manufacture |
| GB2097809A (en) * | 1981-05-06 | 1982-11-10 | Plascoat Uk Ltd | Coating metal articles |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1989012199A1 (en) * | 1988-06-07 | 1989-12-14 | Regal Technology (U.K.) Ltd. | Material for and method of pipeline insulation |
| GB2229246A (en) * | 1988-06-07 | 1990-09-19 | Regal Technology | Material for and method of pipeline insulation |
| GB2229246B (en) * | 1988-06-07 | 1992-10-07 | Regal Technology | Material for and method of pipeline insulation |
| US4976490A (en) * | 1988-10-05 | 1990-12-11 | Ford Motor Company | Reinforced composite structure |
| GB2250934A (en) * | 1990-11-28 | 1992-06-24 | Textilver Sa | Foam lined tubes |
| WO2000073695A1 (en) * | 1999-05-26 | 2000-12-07 | Thermotite As | Steel tube with heat insulation for subsea pipelines and method of producing same |
| GB2365096A (en) * | 1999-05-26 | 2002-02-13 | Thermotite As | Steel tube with heat insulation for subsea pipelines and method of producing same |
| GB2365096B (en) * | 1999-05-26 | 2003-04-09 | Thermotite As | Steel pipe with heat insulation for deep-sea pipelines and method of producing it |
| US6397895B1 (en) | 1999-07-02 | 2002-06-04 | F. Glenn Lively | Insulated pipe |
| WO2005031109A1 (en) * | 2003-09-30 | 2005-04-07 | Drag'n Skin International Inc. | A pipe assembly and a method for installation in a borehole |
| WO2007109382A2 (en) | 2006-03-20 | 2007-09-27 | Alcon, Inc. | Surgical cassette with bubble breaking structure |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8526492D0 (en) | 1985-12-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |