EP1122054A2 - Ensemble de bandes en matière composite et procédé pour son assemblage - Google Patents

Ensemble de bandes en matière composite et procédé pour son assemblage Download PDF

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Publication number
EP1122054A2
EP1122054A2 EP01102143A EP01102143A EP1122054A2 EP 1122054 A2 EP1122054 A2 EP 1122054A2 EP 01102143 A EP01102143 A EP 01102143A EP 01102143 A EP01102143 A EP 01102143A EP 1122054 A2 EP1122054 A2 EP 1122054A2
Authority
EP
European Patent Office
Prior art keywords
epoxy
strip
strips
composite
composite strip
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Withdrawn
Application number
EP01102143A
Other languages
German (de)
English (en)
Other versions
EP1122054A3 (fr
Inventor
Brian Scott Wilson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wellstream Inc
Original Assignee
Wellstream Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Wellstream Inc filed Critical Wellstream Inc
Publication of EP1122054A2 publication Critical patent/EP1122054A2/fr
Publication of EP1122054A3 publication Critical patent/EP1122054A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/02—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments
    • D04H3/07—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments otherwise than in a plane, e.g. in a tubular way

Definitions

  • This invention relates to a composite strip assembly and a method for assembling same.
  • Non-bonded flexible lines, or pipes, for transferring fluids have many applications such as, for example, use as a dynamic riser to couple a rigid pipe, or another flexible pipe, on a seabed to a floating vessel, or buoy, to convey production fluids such as oil, gas, or oil/gas mixtures under pressure from an oil gas well or platform to the vessel or buoy.
  • These types of pipes are usually constructed of an interlocked metallic carcass layer to provide collapse resistance, a polymer fluid barrier, a circumferentially wound profiled strip to provide hoop strength, one or more layers of tensile elements, and a polymer sheath to prevent ingress of sea water.
  • an end fitting is required to couple the flexible pipe at each end to the adjacent pipe, or wellhead, and to the vessel or buoy.
  • Examples of such an end fitting is disclosed in U.S. patent Nos. 5,639,128 and 5,860,682 which are assigned to the same assignee as the present invention.
  • tensile elements have traditionally been manufactured using carbon steel tensile members, or wires, that are anchored into the end fitting by bending the tensile members into "hooks", waves", or “crooks” and then potting or filling the entire end fitting around the tensile wires with a high strength epoxy.
  • composite strips such as those formed by a thermoplastic resin and carbon fibers
  • enjoy very high tensile strength while at the same time being much lighter in weight it would be an advantage to use them in place of the carbon steel tensile members to form the above-mentioned tensile elements in the flexible pipe.
  • composite strips of this type have a relative low shear strength they cannot be formed, or bent, into "hooks", waves", or “crooks” without putting the composite strip into shear loading and drastically reducing their tensile strength to the extent that their use in this manner is prohibitive.
  • An embodiment of the invention consists of a method for anchoring thermoplastic composite strips in an epoxy matrix such that the tensile load of the composite strip is directly transferred to the epoxy, and thus to the body and jacket of an end fitting attached to the strip: Thus, the tensile strength of the composite strip is not reduced below a minimum acceptable value.
  • a composite material is referred to, in general, by the reference numeral 10 in Fig. 1 and consists of a composite of thermoplastic resin and carbon fibers.
  • a non-limiting example of the specifics of the material 10 is as follows: Matrix Material Polyphenylene sulfide (PPS) Fiber Reinforcement Continuous Carbon Fiber Thickness 0.040" (1 mm) ⁇ 0.005" ( 0.13 mm ) Width 0.50" (12.7 mm) ⁇ 0.005" (0.13 mm) Minimum Ultimate Strength 180 ksi (1241 MPa) min. Modulus 13 msi (86 GPa ) min. Elongation 1.0 % min. % Fiber Content 50/43 wt./vol. Minimum Bend Radius 1.5" (38 mm) Compression-Bend Rupture 200 seconds ( @ 85% / f, 90°C in air ) min .
  • This product is marketed by Baycomp of 5035 North Service Road, Burlington, Ontario, Canada, L7L5V2.
  • an end portion of the material 10 is split lengthwise to form four parallel strips 10a 10b, 10c, and 10d, and three spaced parallel strips 12a, 12b, and 12c which extend perpendicular to the strips 10a, 10b, 10c, and 10d and are woven with the latter strips to form wefts as shown in Figs. 1 and 2.
  • the woven strips 10a, 10b, 10c, 10d, 12a, 12b, and 12c are embedded in a matrix of liquid epoxy and allowed to cure.
  • the epoxy is a conventional epoxy such as an epoxy marketed under the designation XMH-8574 available from Vantico.
  • the strips 10a, 10b, 10c, 10d, 12a, 12b, and 12c are firmly anchored in the epoxy matrix, and cannot be pulled out since the pullout path is very circuitous, the overall friction of each strip is increased, and the epoxy within the weave is placed in compression. Moreover, all this is achieved while lowering the tensile strength of each strip only slightly. It is understood that the other end portion of the material 10 is split and formed in the same manner as discussed above.
  • the assembly of the strips 10a, 10b, 10c, 10d, 12a, 12b, and 12c embedded in the epoxy is to be used as a tensile element of a flexible pipe in the manner discussed above, it is formed into a plurality of strips that are helically wound in layers around another inner component of the pipe, such as a circumferentially wound profiled strip.
  • the additional components of the pipe, which are wound or extruded onto the layers of the assembly of the strips 10a, 10b, 10c, 10d, 12a, 12b, and 12c are sealed by the endfitting.
  • the epoxy matrix that anchors the strips is also put into compression by the wedge shape of the interior of the steel endfitting, and thus further increases the compression of the strip and the friction of the epoxy on the strips. Also, the assembly formed by the strips 10a, 10b, 10c, 10d, 12a, 12b, and 12c embedded in the epoxy is put into tension with minimal shear stress on the strips.
  • a strip of composite material is provided which is referred to, in general, by the reference numeral 20 in Fig. 3.
  • the strip 20 consists of a composite of thermoplastic resin and carbon fibers that can be formed in the same manner as the material 10 in the previous embodiment.
  • the strip 20 is initially warmed in any conventional manner, such as with a hot air gun.
  • One end portion 20a of the strip 20 is then coated with a thermoplastic powder of the same type as the matrix polymer of the thermoplastic composite strip, such as Chevron polyphenylene sulfide.
  • the coated end portion 20a is then heated in any conventional manner such as by a hot air gun until the powder resin melts and is adsorbed into the matrix of carbon fiber and PPS polymer. This is repeated until the thickness of the end portion 20a of the strip 20 swells to approximately twice the thickness of the remaining portion of the strip.
  • the end portion 20a is then embedded in a conventional epoxy material of the same type as discussed above and allowed to cure. Once cured, the strip 20 cannot be pulled out of the epoxy matrix, and the tensile strength of the strip is unaltered. The strip 20 itself forces the epoxy material into compression by applying stress against the epoxy material as the strip tries to force its way through the epoxy.
  • a pipe is then formed in the same manner as disclosed above, but using the strip 20 instead of the treated strips 10a, 10b, 10c, 10d, 12a, 12b, and 12c.
  • the epoxy matrix in which the strip 20 is embedded is also put into compression by the wedge shape of the interior of the steel endfitting. This further compresses the epoxy onto the strip and increases the friction of the strip. Also, the strip 20 embedded in the epoxy is put into tension with minimal shear stress on the strip. If a pulling or tensile force is placed on the pipe, and therefore the strip 20, the epoxy is further compressed onto the strip thus increasing the friction to the point that the strip would break before pulling out.
  • thermoplastic composite material anchored in epoxy while transferring the tensile load of the material to the epoxy without reducing the tensile strength of the composite material below a minimum acceptable value.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Braking Arrangements (AREA)
  • Laminated Bodies (AREA)
EP01102143A 2000-02-01 2001-02-01 Ensemble de bandes en matière composite et procédé pour son assemblage Withdrawn EP1122054A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US17891800P 2000-02-01 2000-02-01
US178918P 2000-02-01
US66075000A 2000-09-13 2000-09-13
US660750 2000-09-13

Publications (2)

Publication Number Publication Date
EP1122054A2 true EP1122054A2 (fr) 2001-08-08
EP1122054A3 EP1122054A3 (fr) 2002-08-28

Family

ID=26874811

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01102143A Withdrawn EP1122054A3 (fr) 2000-02-01 2001-02-01 Ensemble de bandes en matière composite et procédé pour son assemblage

Country Status (2)

Country Link
EP (1) EP1122054A3 (fr)
BR (1) BR0102038A (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4548428A (en) * 1984-10-29 1985-10-22 Ruhle James L Anti back-out steel coupling system for nonmetallic composite pipe
US4714642A (en) * 1983-08-30 1987-12-22 Basf Aktiengesellschaft Carbon fiber multifilamentary tow which is particularly suited for weaving and/or resin impregnation
US4875717A (en) * 1987-02-17 1989-10-24 Hercules Incorporated End connectors for filament wound tubes
EP0383174A2 (fr) * 1989-02-17 1990-08-22 Cytec Technology Corp. Matériaux de construction thermodurcissant tenaces
EP0272083B1 (fr) * 1986-12-16 1993-03-03 Toray Industries, Inc. Préforme pour matière plastique renforcée de fibres
EP0909845A1 (fr) * 1997-08-04 1999-04-21 Toray Industries, Inc. Tissu en fibre de carbone, pièce moulée en plastique renforcée par des fibres obtenue en utilisant le tissu, et procédé de fabrication de la pièce moulée
US5925579A (en) * 1996-05-23 1999-07-20 Hexcel Corporation Reinforcement of structures in high moisture environments

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4714642A (en) * 1983-08-30 1987-12-22 Basf Aktiengesellschaft Carbon fiber multifilamentary tow which is particularly suited for weaving and/or resin impregnation
US4548428A (en) * 1984-10-29 1985-10-22 Ruhle James L Anti back-out steel coupling system for nonmetallic composite pipe
EP0272083B1 (fr) * 1986-12-16 1993-03-03 Toray Industries, Inc. Préforme pour matière plastique renforcée de fibres
US4875717A (en) * 1987-02-17 1989-10-24 Hercules Incorporated End connectors for filament wound tubes
EP0383174A2 (fr) * 1989-02-17 1990-08-22 Cytec Technology Corp. Matériaux de construction thermodurcissant tenaces
US5925579A (en) * 1996-05-23 1999-07-20 Hexcel Corporation Reinforcement of structures in high moisture environments
EP0909845A1 (fr) * 1997-08-04 1999-04-21 Toray Industries, Inc. Tissu en fibre de carbone, pièce moulée en plastique renforcée par des fibres obtenue en utilisant le tissu, et procédé de fabrication de la pièce moulée

Also Published As

Publication number Publication date
EP1122054A3 (fr) 2002-08-28
BR0102038A (pt) 2004-08-24

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