AU688413B2 - Flexible sheath and its application to flexible metal pipes and cables - Google Patents
Flexible sheath and its application to flexible metal pipes and cables Download PDFInfo
- Publication number
- AU688413B2 AU688413B2 AU81501/94A AU8150194A AU688413B2 AU 688413 B2 AU688413 B2 AU 688413B2 AU 81501/94 A AU81501/94 A AU 81501/94A AU 8150194 A AU8150194 A AU 8150194A AU 688413 B2 AU688413 B2 AU 688413B2
- Authority
- AU
- Australia
- Prior art keywords
- flexible
- sheath
- pipes
- cables
- pipe
- 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.)
- Ceased
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D23/00—Producing tubular articles
- B29D23/001—Pipes; Pipe joints
-
- 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
- F16L9/00—Rigid pipes
- F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
- F16L9/147—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups comprising only layers of metal and plastics with or without reinforcement
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
-
- 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
- B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
- B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
- B29K2027/14—PVF, i.e. polyvinyl fluoride
Description
1 Flexible Sheath and Its Application to Flexible Metal Pipes and Cables The present invention relates to a flexible sheath of trifluoroethylene homopolymer
(PVF
3 and its application to flexible metal pipes or cables.
It is well known to use flexible pipes in maritime oil and gas exploitation. These flexible pipes comprise of an inner flexible steel pipe, a plastics sheath, the function of which is to render the pipe leakproof to oils and gases, and metal armouring. Such flexible pipes are, for example, described in European Patent EP 166,385.
Polyamides, which are suitable when the temperature of exploitation of the fluids does not exceed 80 to 100 0 C, are used as leakproof thermoplastic sheaths.
S" For higher temperatures, for example up to 130 or 140°C, poly(vinylidene fluoride) (PVDF) is used. However, as this polymer is semicrystalline and is highly rigid, its use is not suitable when the structure is intended to be coiled and uncoiled, sometimes at very low temperature, unless internally or externally plasticized.
An example of internal plasticization is described in European Patent EP 166,385 mentioned above: vinylidene fluoride is copolymerized with a fluorinated monomer. The S flexibility of the sheath is thus increased but its temperature of use is generally decreased, its permeability to gases is increased and there is an increased sensitivity (with respect to the homopolymer) to bursting under sudden decompression, making its use dangerous for some high temperature and pressure operations.
[N:\LIBxx100959:VMJ II I iv The use of external plasticizers is mentioned in French Patents 2,560,884, 2,592,655 and 2,618,791. Some plasticizers make PVDF homopolymer sufficiently supple for use on flexible pipes. However, in use, it is observed that the sheath slowly returns to its original rigidity due to loss of the, generally highly PVDF compatible, plasticizer. Not only does the rigidity increase but the polymer becomes embrittled as a result of the creation of internal stresses due to loss of the plasticizer and the tendency of the sheath to shrink being impeded.
It has now surprisingly been found that the disadvantages resulting from the use of internally or externally plasticized PVDF may be avoided by the use of trifluoroethylene homopolymer. In particular it has been found that particularly flexible sheaths (or pipes) may be made by using trifluoroethylene homopolymers.
According to one aspect of the present invention, there is provided a flexible metal pipe bearing a flexible sheath of trifluoroethylene homopolymer.
According to another aspect of the present invention, there is provided a cable bearing a flexible sheath of trifluorethylene homopolymer.
The sheaths according to the present invention have temperatures of use much greater than those produced from PVDF. Moreover, the sheath is much more flexible.
[N:\LIBxx]00959:VMJ 3 It would not be departing from the scope of the invention by adding to the sheath polymer fillers, pigments or even a small amount of plasticizers e.g. of ester or sulphonamide type.
The flexible pipe according to the invention is particularly useful for transporting liquid or gaseous hydrocarbons at high temperature. The flexible pipe can also carry a protective layer such as of rubber, metal or textile cloth, and the like.
The invention further provides the use of a pipe according to the invention for underwater transport of oil or gas.
The sheaths according to the invention may also be used to protect cables. The cable can be a metal wire or a strand or a number of strands forming a metal cable.
[N:\LIBxx00959:VMJ Whether cables or flexible pipes, the sheath may be applied by extrusion.
Examples The invention is further illustrated by the following Examples.
In the Examples a thermoplastic sheath, thick, is extruded around a flexible steel pipe with a diameter of 32 mm, the pipe consisting of turns between which there are hollows and chinks which allow the pipe to articulate.
In order to compare the ability of different ooo *.*sheath materials to coil up, the following procedure was used: The sheathed pipe is placed on two stationary supports. Using a bending wheel with a radius of 75 mm, pressure is applied at a point equidistant from those supporting the pipe. The pressure necessary to deform the sheathed pipe and to give it the radius of curvature of the wheel is applied to the wheel. The 20 indentation depth of the wheel shows the ability of the e flexible pipe to deform. The maximum depth is 170 mm: it corresponds to the perfect coiling of the sheathed pipe on the wheel. If rupturing takes place before perfect coiling of the sheathed pipe, the depth is noted. The greater it is, the more the flexible pipe is capable of bending.
Moreover, the test is carried out at c different temperatures.
Example I Indentation depth of the wheel before rupturing (in mm -170 mm corresponds to the mnaximum) 1 Sample I 1I III IV 0 C 120 170 170 170 -300C 80 150 100 160 Sheath 1: VF 2 homopolymer -Foraf ion 1000 from Elf Atochem.
10 Sheath II: VF 2 homopolymer 7. 5% by weight of N-butylbenzenesulphonanide.
444siSheath III: Copolymer of VF 2 and hexaf luoropropene in the 95/5 molar ratio.
Sheath IV: VF 3 homopolymer.
15 Example 2 The 4 sheathed flexible pipes are subjected to thermal aging for 3 months at 150 0 C. Then the pipes were subjected to the tests described above.
I
Indentation depth of the wheel before rupturing (in mm 170 mm corresponds to the maximum) Sample I II III IV 0 C 100 90 Unusable 170 molten sheath -300C 40 40 Unusable 140 molten sheath Example 3 The 4 flexible pipes are subjected to thermal aging for 3 months at 180 0 C. The pipes are then subjected to the tests as described above.
Indentation depth of the wheel before rupturing (in mm 170 mm corresponds to the maximum) Sample I II III IV 0 C Unusable Unusable Unusable 160 sheaths sheaths sheaths 0 C molten- molten- molten- 110 deformed deformed deformed r
PISYES~
r r r r
Claims (4)
1. A flexible metal pipe bearing a flexible sheath of trifluoroethylene homopolymer.
2. A pipe according to claim 1 substantially as described in the Examples.
3. A cable bearing a flexible sheath of trifluoroethylene homopolymer.
4. Use of a pipe according to claim 1 for underwater transport of oil or gas. Dated 6 January, 1998 Elf Atochem S.A. Patent Attorneys for the Applicant/Nominated Person SPRUSON FERGUSON Se e ee [N:\LIBxx]00959:VMJ ABSTRACT FLEXIBLE SHEATH AND ITS APPLICATION TO FLEXIBLE METAL PIPES AND CABLES The invention relates to flexible sheaths based on polytrifluoroethylene. These sheaths can be arranged around flexible metal pipes or cables. The sheathed pipes according to the invention can be used as offshore flexible pipes. *fe* @0 o* oe o oo r o ~1111 1 I
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9315235 | 1993-12-17 | ||
| FR9315235A FR2714140B1 (en) | 1993-12-17 | 1993-12-17 | Flexible sheath in PVF3 and its application to metallic hoses. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU8150194A AU8150194A (en) | 1995-06-22 |
| AU688413B2 true AU688413B2 (en) | 1998-03-12 |
Family
ID=9454071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU81501/94A Ceased AU688413B2 (en) | 1993-12-17 | 1994-12-16 | Flexible sheath and its application to flexible metal pipes and cables |
Country Status (15)
| Country | Link |
|---|---|
| JP (1) | JP2803584B2 (en) |
| KR (1) | KR950018074A (en) |
| CN (1) | CN1114932A (en) |
| AU (1) | AU688413B2 (en) |
| BE (1) | BE1009248A3 (en) |
| BR (1) | BR9405112A (en) |
| CA (1) | CA2138355A1 (en) |
| DE (1) | DE4445083A1 (en) |
| DK (1) | DK143794A (en) |
| FI (1) | FI945931A (en) |
| FR (1) | FR2714140B1 (en) |
| GB (1) | GB2284819B (en) |
| IT (1) | IT1271733B (en) |
| NO (1) | NO944863L (en) |
| SE (1) | SE9404251L (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9611668D0 (en) * | 1996-06-05 | 1996-08-07 | Balmoral Group | Pipe coating |
| CN1100081C (en) * | 2000-08-01 | 2003-01-29 | 上海天臣新技术有限公司 | Antiforge pressure-sensitive marker of high-molecular porous compound film and its preparing process |
| JP5413454B2 (en) | 2009-03-23 | 2014-02-12 | ダイキン工業株式会社 | Fluorine resin and riser pipe |
| CN110603284B (en) | 2017-05-10 | 2022-04-19 | 大金工业株式会社 | Sheet, laminate, pipe, riser pipe, and flow pipe |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4584215A (en) * | 1984-03-06 | 1986-04-22 | Institut Francais Du Petrole | Polyvinylidene fluoride compositions of improved flexibility and their use, particularly in the manufacture of flexible tubes |
| US4692381A (en) * | 1984-07-16 | 1987-09-08 | Pennwalt Corporation | Foamable polyvinylidene fluoride and methods |
| US5429849A (en) * | 1993-01-25 | 1995-07-04 | Solvay (Societe Anonyme) | Polymer compositions intended for the manufacture of cables and flexible pipes and articles based on these compositions |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2739246A1 (en) * | 1977-08-31 | 1979-03-15 | Siemens Ag | Wires with balloon insulation of polyester or fluorocarbon! - giving low dielectric constant and good stability |
| JPS5951421B2 (en) * | 1978-01-24 | 1984-12-13 | 旭硝子株式会社 | Piping materials suitable for moist heat fluids |
| DE3105971A1 (en) * | 1981-02-18 | 1982-08-19 | The Kendall Co., 02101 Boston, Mass. | METHOD FOR COATING TUBES |
| JPS59177199A (en) * | 1983-03-26 | 1984-10-06 | Kurita Water Ind Ltd | Suppression of propagation of bacteria in piping |
| JPS59200202A (en) * | 1983-04-27 | 1984-11-13 | Sumitomo Chem Co Ltd | Optical transmission fiber |
| NO165612C (en) * | 1984-06-20 | 1991-03-06 | Furukawa Electric Co Ltd | FLEXIBLE COMPOSITION ROOM FOR TRANSPORTING A HIGH-TEMPERATURE FLUID. |
| FR2592655B1 (en) * | 1986-01-07 | 1988-07-29 | Atochem | COMPOSITE BASED ON VINYLIDENE POLYFLUORIDE WITH IMPROVED HOLD IN CONTACT WITH HYDROCARBONS - APPLICATION TO THE MANUFACTURE OF TUBE FOR THE OIL INDUSTRY. |
| JPS6374010A (en) * | 1986-09-18 | 1988-04-04 | Toray Ind Inc | Plastic optical fiber having good heat resistance |
| JPH0640164B2 (en) * | 1987-04-22 | 1994-05-25 | セントラル硝子株式会社 | Heat resistant optical transmission fiber |
| FR2618791B1 (en) * | 1987-07-31 | 1989-12-29 | Inst Francais Du Petrole | POLYMER COMPOSITIONS COMPRISING VINYLIDENE POLYFLUORIDE AND AN ELASTOMER, THEIR PREPARATION AND THEIR USES |
| GB2223188B (en) * | 1988-08-26 | 1992-04-15 | Usui Kokusai Sangyo Kk | Coated metal pipe and method for manufacturing the same |
-
1993
- 1993-12-17 FR FR9315235A patent/FR2714140B1/en not_active Expired - Fee Related
-
1994
- 1994-12-07 SE SE9404251A patent/SE9404251L/en not_active Application Discontinuation
- 1994-12-12 GB GB9425010A patent/GB2284819B/en not_active Expired - Fee Related
- 1994-12-13 IT ITMI942500A patent/IT1271733B/en active IP Right Grant
- 1994-12-15 BR BR9405112A patent/BR9405112A/en active Search and Examination
- 1994-12-15 NO NO944863A patent/NO944863L/en unknown
- 1994-12-16 KR KR1019940034679A patent/KR950018074A/en not_active Application Discontinuation
- 1994-12-16 DK DK143794A patent/DK143794A/en not_active Application Discontinuation
- 1994-12-16 JP JP6313351A patent/JP2803584B2/en not_active Expired - Lifetime
- 1994-12-16 AU AU81501/94A patent/AU688413B2/en not_active Ceased
- 1994-12-16 CA CA002138355A patent/CA2138355A1/en not_active Abandoned
- 1994-12-16 FI FI945931A patent/FI945931A/en not_active Application Discontinuation
- 1994-12-16 DE DE4445083A patent/DE4445083A1/en not_active Withdrawn
- 1994-12-16 BE BE9401137A patent/BE1009248A3/en not_active IP Right Cessation
- 1994-12-17 CN CN94119528A patent/CN1114932A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4584215A (en) * | 1984-03-06 | 1986-04-22 | Institut Francais Du Petrole | Polyvinylidene fluoride compositions of improved flexibility and their use, particularly in the manufacture of flexible tubes |
| US4692381A (en) * | 1984-07-16 | 1987-09-08 | Pennwalt Corporation | Foamable polyvinylidene fluoride and methods |
| US5429849A (en) * | 1993-01-25 | 1995-07-04 | Solvay (Societe Anonyme) | Polymer compositions intended for the manufacture of cables and flexible pipes and articles based on these compositions |
Also Published As
| Publication number | Publication date |
|---|---|
| AU8150194A (en) | 1995-06-22 |
| SE9404251D0 (en) | 1994-12-07 |
| NO944863L (en) | 1995-06-19 |
| SE9404251A0 (en) | 1995-06-18 |
| JP2803584B2 (en) | 1998-09-24 |
| CN1114932A (en) | 1996-01-17 |
| FI945931A0 (en) | 1994-12-16 |
| FI945931A (en) | 1995-06-18 |
| JPH07276523A (en) | 1995-10-24 |
| DE4445083A1 (en) | 1995-06-22 |
| SE9404251L (en) | 1995-06-18 |
| IT1271733B (en) | 1997-06-04 |
| NO944863D0 (en) | 1994-12-15 |
| GB2284819A (en) | 1995-06-21 |
| ITMI942500A0 (en) | 1994-12-13 |
| BE1009248A3 (en) | 1997-01-07 |
| GB2284819B (en) | 1997-11-19 |
| FR2714140B1 (en) | 1996-01-19 |
| BR9405112A (en) | 1995-08-08 |
| GB9425010D0 (en) | 1995-02-08 |
| ITMI942500A1 (en) | 1996-06-13 |
| DK143794A (en) | 1995-06-18 |
| CA2138355A1 (en) | 1995-06-18 |
| FR2714140A1 (en) | 1995-06-23 |
| KR950018074A (en) | 1995-07-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |