WO2009109776A2 - Mould for forming a cladding upon an elongate member - Google Patents
Mould for forming a cladding upon an elongate member Download PDFInfo
- Publication number
- WO2009109776A2 WO2009109776A2 PCT/GB2009/050212 GB2009050212W WO2009109776A2 WO 2009109776 A2 WO2009109776 A2 WO 2009109776A2 GB 2009050212 W GB2009050212 W GB 2009050212W WO 2009109776 A2 WO2009109776 A2 WO 2009109776A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mould
- cladding
- elongate member
- sections
- strake
- Prior art date
Links
- 238000005253 cladding Methods 0.000 title claims abstract description 55
- 238000000465 moulding Methods 0.000 claims description 17
- 230000013011 mating Effects 0.000 claims description 13
- 230000001629 suppression Effects 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000003921 oil Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 238000000605 extraction Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000004005 microsphere Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
-
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0003—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor of successively moulded portions rigidly joined to each other
-
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/005—Moulds or cores; Details thereof or accessories therefor characterised by the location of the parting line of the mould parts
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14598—Coating tubular articles
-
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
-
- 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
-
- 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
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/12—Laying or reclaiming pipes on or under water
- F16L1/123—Devices for the protection of pipes under water
Definitions
- the present invention is concerned with cladding for elongate members deployed underwater, and particularly with a mould and a method for moulding cladding directly onto such members.
- VIV vortex induced vibration
- GB2419171 (filed in the name of CRP Group Ltd.) discloses a pipe assembly having an insulating layer moulded in-situ upon it and formed by a mixture of high density polyethylene and density-reducing microspheres.
- a mould for use in moulding a cladding directly onto an elongate member, the mould comprising at least two mould sections adapted to be assembled to one another upon the elongate member to define a mould cavity around it which is shaped to mould a cladding section having a sheath portion which surrounds and embraces the elongate member and at least one VIV suppression feature extending along the length of the cladding section, the mould having male and female ends, the male end being shaped to form a mating portion of the cladding section and the female end being shaped to receive and be closed by the mating portion of an existing cladding section, so that after moulding of a first cladding section the mould can be re-mounted with its female end closed by the mating portion of the first cladding section to form a second cladding section which is continuous with the first.
- the sheath portion of the cladding can serve to provide thermal insulation.
- the cladding also provides protection against VlV.
- the mould according to the present invention allows a cladding performing both functions to be straightforwardly moulded directly onto the member being protected.
- the mould can of course be re-mounted an arbitrary number of times to form a continuous cladding of a desired length.
- the VIV suppression feature need not extend along a precisely axial direction with respect to the elongate member. Preferably it extends along a helix about the elongate member. While it could for example be a female shape such as a trough, its preferred form is an outwardly projecting strake.
- the mould sections are separable from one another along the line of at least one strake. In this way mould release problems are avoided.
- the lines of separation between two mould sections may for example be helical, where the strakes have this shape.
- the mould preferably has the same internal section at (a) its female end and (b) a region adjacent the mating portion. Hence the part of the cladding section formed by region (b) is insertable into the female end of the mould.
- the male end of the mould is preferably shaped to form a mating section of reduced lateral dimension compared with the mould's female end.
- the male end of the mould is preferably formed by an end cap secured to the mould sections.
- the end cap may be in two or more parts to enable it to be assembled around the elongate member.
- a mould for use in moulding a cladding directly onto an elongate member, the mould comprising at least two mould sections adapted to be assembled to one another upon the elongate member to define a mould cavity around it which is shaped to mould a cladding section having a sheath portion which surrounds and embraces the elongate member and at least one strake projecting outwardly from the sheath portion and extending helically along the length of the cladding section, the mould sections meeting one another along the line of the said strake.
- the mould sections each have helical peripheral surfaces which abut one another in the assembled mould.
- surfaces through which the mould sections meet each other are at the outermost extremity of the strake.
- the mould sections incorporate heating elements to aid curing.
- the heating elements are preferably at or adjacent the outer extremity of the strake.
- the mould cavity is shaped to form three helical strakes, there being three mould sections each of which meets the two neighbouring sections along the line of a respective strake.
- the mould further comprises an end cap detachably securable to the mould sections to close one end of the mould cavity.
- the end cap may be formed from two or more parts for assembly around the elongate member. It preferably has a through-going opening to receive the elongate member.
- Figure 1 is a perspective view of a mould embodying the present invention
- Figure 2 is a side elevation of the same mould
- Figure 3 is an end elevation of the mould along lines B-B of Figure 2;
- Figure 4 is an end elevation of the mould along lines A-A of Figure 2;
- Figure 5 is a perspective view of a mould section forming part of the mould of Figures 1 to 4;
- Figure 6 is an enlarged perspective view of part of the mould section seen in circle D of Figure 5;
- Figure 7 shows a vent/nozzle for use with the mould
- FIGS. 8a-e illustrate successive stages in the fabrication of cladding embodying the present invention.
- the mould 10 seen in Figures 1 to 4 is for moulding a cladding 14 directly onto an elongate cylindrical member such as a sub-sea jumper 13 (Figure 8).
- the cladding 14 comprises a continuous annular sheath 15 about the member 13 with integrally formed strakes 16 projecting from it.
- the strakes extend along the length of the cladding 14. In the illustrated embodiment they each form a shallow pitched helix, which has been demonstrated to be an effective shape for VIV suppression. Nonetheless the strakes could be differently shaped.
- the strakes 16 of the present embodiment project radially outwardly from the sheath 15 and are continuous - that is, they are without breaks or interruptions. However to simplify the moulding process, breaks in the strake profile could be formed between cladding sections.
- the mould 10 comprises three identically formed mould sections 18 (see Figure 5) shaped to be assembled to one another about the member 12 to define around it a mould cavity for forming the cladding 14.
- Each mould section 18 comprises a part-cylindrical portion 20 whose two longitudinal edges are helical and meet respective upstanding helical fin portions 22, 24.
- the fin portions of adjacent mould sections 18 together define the helical strake portions of the mould cavity.
- Their section is best seen in Figure 6.
- Each has at its radially outermost region an abutment surface 22 for contacting and sealing against a similarly fo ⁇ ned surface of the adjacent mould section 18.
- the abutment surfaces 22 are helical, and are outboard of the outer hips of the strakes.
- Location features 24 are provided for ensuring alignment of neighbouring mould sections 18. They may, for example, take the form of pips in one section and complementary recesses in the other, or may be holes for receiving bolts to secure the mould sections together.
- a shoulder 26 forming the inner edge of the abutment surface 22 ensures that the strakes 16 have blunt outer tips.
- Outer strips 23 incorporate electrical heater elements to promote curing.
- One end of the mould 10 (to be referred to below as the female end) has a first outwardly projecting flange 28 defined by part-annular portions of the three mould sections 18.
- the other end of the mould (to be referred to below as the male end) has a smaller outwardly projecting second flange 30 again defined by part-annular portions of the three mould sections 18.
- both ends of the mould need to be closed.
- the front end is closed by means of an end cap 32 formed in two semi-annular parts securable to one another around the cylindrical member 12.
- the reduced diameter portion has a chamfer 40 leading to a reduced diameter constant diameter region 42 which in turn leads to a frustro-conical portion 44 terminating in an annular collar 46 which fo ⁇ ns a seal against the cylindrical elongate member 13.
- the rear end of the mould 10 can be closed by securing an end plate 50 to the first flange 28, the end plate having a bore, which receives and seals against the elongate member 13.
- the mould 10 is first assembled around the elongate member 13 with its end plate 50 and end cap 32 in place ( Figure 8a).
- Settable resin is injected into the mould 10 to fill it and then cures. Heat may be applied by means of the aforementioned heating elements to promote curing.
- Disassembling and removing the mould 10 leaves a section of cladding 14 ( Figure 8b) which lies around and is bonded to the member 13.
- the mould 10 is re-assembled upon the member 13 as seen in Figure 8c, with its rear end overlapping and embracing the first section, and forming a seal against it.
- the end plate 50 is thus not required.
- the fins 22, 24 of the mould 10 locate upon and seal against the strakes 16 of the first cladding section 14, and hence the result of moulding the second cladding section is the continuous strakes 16 seen in Figure 8d.
- the mating feature 38 of the first cladding section projects into and is embraced by the rear end of the next, as seen in Figure 8e.
- the cladding's cylindrical sheath forms a continuous layer about the member 13 without excessive weakening or discontinuity between separately moulded sections.
- the moulding process can be repeated any number of times to provide a required length of cladding. Curing time can be as little as five minutes so the process need not be excessively time consuming.
- Venting of air from the mould as the resin material is injected prevents a potential problem.
- a vent needs to be provided at the mould's uppermost point to avoid inclusion of air bubbles which could impair the cladding's quality.
- the mould needs to be rotated, between one section and the next, through an angle determined by the formation of the strakes 16. Hence a vent correctly placed to serve its function when moulding the first cladding section may be too low to do so when moulding the next.
- the solution adopted in the illustrated embodiment is to provide multiple vents at angular intervals around the mould 10, and to selectively blank these off when they are not required.
- the vents are in outer regions of the fins 22, 24.
- FIGS. 1, 2, 4 and 5 Their positions can be appreciated from Figures 1, 2, 4 and 5, in which blanking plates 60 covering the vents can be seen. In use one of these (preferably the lowermost vent) is replaced with a nozzle port 62 seen in Figure 7, which is coupled to a conduit for receiving the resin, and another (the uppermost vent) is left open to release air.
- the preferred material of the cladding 14 is a glass syntactic polyurethane - a mixture of settable polyurethane resin with density reducing hollow glass microspheres. Other suitable materials could be used.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Earth Drilling (AREA)
Abstract
A mould (10) is described for use in forming directly onto an elongate member (13), such as a riser or jumper for deployment underwater, a cladding (14) which can serve both to insulate the elongate member and to protect it from vortex induced vibration. Features such as helical strakes (16) are formed along the exterior of the cladding to disrupt flow over it and so guard against vortex induced vibration. The mould is formed from multiple sections (18) adapted to be assembled to one another upon the member (13) and thereby to define a mould cavity around it. The cavity is shaped to mould a cladding section having a sheath portion (15) which surrounds and embraces the elongate member, as well as the aforementioned strake or strakes. The mould has male and female ends. By repeatedly re-mounting the mould, a cladding section of arbitrary length can be formed. In a further embodiment, the mould comprises sections meeting one another along the line of the said strake.
Description
DESCRIPTION
MOULD FOR FORMING A CLADDING UPON AN ELONGATE MEMBER
The present invention is concerned with cladding for elongate members deployed underwater, and particularly with a mould and a method for moulding cladding directly onto such members.
There are many practical situations in which elongate conduits must be deployed underwater. In sub -sea oil extraction, for example, elongate conduits referred to as "jumpers" lead from wellheads to a valve manifold, and thence to a riser leading to a surface platform. A potential problem with any elongate member in a flow of water (e.g. a tidal or "cold loop" current) is vortex induced vibration ("VIV"). Vortices are created downstream of the member, and VIV happens when shedding of vortices is coherent along a sufficient length of the member and takes place alternately from opposite sides of it, creating a fluctuating force across the direction of flow. If the member has a natural frequency of oscillation close to the shedding frequency of the vortices, resonance can occur. The resulting vibration can be damaging to the structure.
It is known to protect underwater members against VIV by providing them with external features which disrupt the pattern of vortex shedding. Helical strakes for this purpose are disclosed for example in GB 2335248 (filed in the name of CRP Group Ltd.) That document contained a suggestion that the cladding could be formed directly on the pipe, but gave no details about how this could be achieved.
Low water temperatures can give rise to the separate problem of unwanted cooling of the contents of an underwater conduit. In sub-sea oil extraction the crude oil emerges from the wellhead at an elevated temperature. If cooled sufficiently it becomes viscous and waxy and can restrict or prevent flow. The problem is most severe when flow is interrupted, e.g. due to maintenance or modification. For example flow through the jumper leading from a wellhead may be closed off by valves for protracted periods for repair or maintenance and there is the risk that oil in them will be cooled enough to create a problem when the valves are subsequently opened.
GB2419171 (filed in the name of CRP Group Ltd.) discloses a pipe assembly having an insulating layer moulded in-situ upon it and formed by a mixture of high density polyethylene and density-reducing microspheres.
According to a first aspect of the present invention there is a mould for use in moulding a cladding directly onto an elongate member, the mould comprising at least two mould sections adapted to be assembled to one another upon the elongate member to define a mould cavity around it which is shaped to mould a cladding section having a sheath portion which surrounds and embraces the elongate member and at least one VIV suppression feature extending along the length of the cladding section, the mould having male and female ends, the male end being shaped to form a mating portion of the cladding section and the female end being shaped to receive and be closed by the mating portion of an existing
cladding section, so that after moulding of a first cladding section the mould can be re-mounted with its female end closed by the mating portion of the first cladding section to form a second cladding section which is continuous with the first.
The sheath portion of the cladding can serve to provide thermal insulation. The cladding also provides protection against VlV. The mould according to the present invention allows a cladding performing both functions to be straightforwardly moulded directly onto the member being protected. The mould can of course be re-mounted an arbitrary number of times to form a continuous cladding of a desired length.
The VIV suppression feature need not extend along a precisely axial direction with respect to the elongate member. Preferably it extends along a helix about the elongate member. While it could for example be a female shape such as a trough, its preferred form is an outwardly projecting strake.
Strakes create potential problems with mould release - i.e. with the removal of the mould sections after the moulding has cured. In a preferred embodiment of the present invention, the mould sections are separable from one another along the line of at least one strake. In this way mould release problems are avoided. The lines of separation between two mould sections may for example be helical, where the strakes have this shape.
The mould preferably has the same internal section at (a) its female end and (b) a region adjacent the mating portion. Hence the part of the cladding section formed by region (b) is insertable into the female end of the mould.
The male end of the mould is preferably shaped to form a mating section of reduced lateral dimension compared with the mould's female end. Hence when moulding the second and successive sections, material of the new moulding can overlap the mating section of the existing one and adhere to it to form a joint between one cladding section and the next.
The male end of the mould is preferably formed by an end cap secured to the mould sections. The end cap may be in two or more parts to enable it to be assembled around the elongate member.
According to a second aspect of the present invention there is a mould for use in moulding a cladding directly onto an elongate member, the mould comprising at least two mould sections adapted to be assembled to one another upon the elongate member to define a mould cavity around it which is shaped to mould a cladding section having a sheath portion which surrounds and embraces the elongate member and at least one strake projecting outwardly from the sheath portion and extending helically along the length of the cladding section, the mould sections meeting one another along the line of the said strake.
Preferably the mould sections each have helical peripheral surfaces which abut one another in the assembled mould.
Preferably surfaces through which the mould sections meet each other are at the outermost extremity of the strake.
Preferably the mould sections incorporate heating elements to aid curing. The heating elements are preferably at or adjacent the outer extremity of the strake. It is particularly preferred that the mould cavity is shaped to form three helical strakes, there being three mould sections each of which meets the two neighbouring sections along the line of a respective strake.
Preferably the mould further comprises an end cap detachably securable to the mould sections to close one end of the mould cavity. The end cap may be formed from two or more parts for assembly around the elongate member. It preferably has a through-going opening to receive the elongate member.
Specific embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:-
Figure 1 is a perspective view of a mould embodying the present invention;
Figure 2 is a side elevation of the same mould;
Figure 3 is an end elevation of the mould along lines B-B of Figure 2;
Figure 4 is an end elevation of the mould along lines A-A of Figure 2;
Figure 5 is a perspective view of a mould section forming part of the mould of Figures 1 to 4;
Figure 6 is an enlarged perspective view of part of the mould section seen in circle D of Figure 5;
Figure 7 shows a vent/nozzle for use with the mould; and
Figures 8a-e illustrate successive stages in the fabrication of cladding embodying the present invention.
The mould 10 seen in Figures 1 to 4 is for moulding a cladding 14 directly onto an elongate cylindrical member such as a sub-sea jumper 13 (Figure 8). As Figures 8d and 8e show, the cladding 14 comprises a continuous annular sheath 15 about the member 13 with integrally formed strakes 16 projecting from it. In the particular embodiment illustrated herein there are three strakes 16, although a different number could be chosen. The strakes extend along the length of the cladding 14. In the illustrated embodiment they each form a shallow pitched helix, which has been demonstrated to be an effective shape for VIV suppression. Nonetheless the strakes could be differently shaped. The strakes 16 of the present embodiment project radially outwardly from the sheath 15 and are continuous - that is, they are without breaks or interruptions. However to simplify the moulding process, breaks in the strake profile could be formed between cladding sections.
The mould 10 comprises three identically formed mould sections 18 (see Figure 5) shaped to be assembled to one another about the member 12 to define around it
a mould cavity for forming the cladding 14. Each mould section 18 comprises a part-cylindrical portion 20 whose two longitudinal edges are helical and meet respective upstanding helical fin portions 22, 24. The fin portions of adjacent mould sections 18 together define the helical strake portions of the mould cavity. Their section is best seen in Figure 6. Each has at its radially outermost region an abutment surface 22 for contacting and sealing against a similarly foπned surface of the adjacent mould section 18. The abutment surfaces 22 are helical, and are outboard of the outer hips of the strakes. Location features 24 are provided for ensuring alignment of neighbouring mould sections 18. They may, for example, take the form of pips in one section and complementary recesses in the other, or may be holes for receiving bolts to secure the mould sections together. A shoulder 26 forming the inner edge of the abutment surface 22 ensures that the strakes 16 have blunt outer tips. Outer strips 23 incorporate electrical heater elements to promote curing.
One end of the mould 10 (to be referred to below as the female end) has a first outwardly projecting flange 28 defined by part-annular portions of the three mould sections 18. The other end of the mould (to be referred to below as the male end) has a smaller outwardly projecting second flange 30 again defined by part-annular portions of the three mould sections 18. To form a closed mould cavity, both ends of the mould need to be closed. The front end is closed by means of an end cap 32 formed in two semi-annular parts securable to one another around the cylindrical member 12. It has a cap flange 34 through which it is releasably securable to the second flange 30, and a reduced diameter portion 36
which forms a mating feature (item 38 in Figure 8e) on the end of the moulded cladding 14. In more detail, the reduced diameter portion has a chamfer 40 leading to a reduced diameter constant diameter region 42 which in turn leads to a frustro-conical portion 44 terminating in an annular collar 46 which foπns a seal against the cylindrical elongate member 13.
The rear end of the mould 10 can be closed by securing an end plate 50 to the first flange 28, the end plate having a bore, which receives and seals against the elongate member 13.
Steps in the process of moulding the cladding 14 on the jumper 13 will now be explained with reference to Figure 8.
The mould 10 is first assembled around the elongate member 13 with its end plate 50 and end cap 32 in place (Figure 8a). Settable resin is injected into the mould 10 to fill it and then cures. Heat may be applied by means of the aforementioned heating elements to promote curing. Disassembling and removing the mould 10 leaves a section of cladding 14 (Figure 8b) which lies around and is bonded to the member 13. To form the next section of cladding, the mould 10 is re-assembled upon the member 13 as seen in Figure 8c, with its rear end overlapping and embracing the first section, and forming a seal against it. The end plate 50 is thus not required. The fins 22, 24 of the mould 10 locate upon and seal against the strakes 16 of the first cladding section 14, and hence the result of moulding the second cladding section is the continuous strakes 16 seen in Figure 8d. Note also
that the mating feature 38 of the first cladding section projects into and is embraced by the rear end of the next, as seen in Figure 8e. In this way the cladding's cylindrical sheath forms a continuous layer about the member 13 without excessive weakening or discontinuity between separately moulded sections. Clearly the moulding process can be repeated any number of times to provide a required length of cladding. Curing time can be as little as five minutes so the process need not be excessively time consuming.
Venting of air from the mould as the resin material is injected prevents a potential problem. A vent needs to be provided at the mould's uppermost point to avoid inclusion of air bubbles which could impair the cladding's quality. Note however that the mould needs to be rotated, between one section and the next, through an angle determined by the formation of the strakes 16. Hence a vent correctly placed to serve its function when moulding the first cladding section may be too low to do so when moulding the next. The solution adopted in the illustrated embodiment is to provide multiple vents at angular intervals around the mould 10, and to selectively blank these off when they are not required. The vents are in outer regions of the fins 22, 24. Their positions can be appreciated from Figures 1, 2, 4 and 5, in which blanking plates 60 covering the vents can be seen. In use one of these (preferably the lowermost vent) is replaced with a nozzle port 62 seen in Figure 7, which is coupled to a conduit for receiving the resin, and another (the uppermost vent) is left open to release air.
The preferred material of the cladding 14 is a glass syntactic polyurethane - a mixture of settable polyurethane resin with density reducing hollow glass microspheres. Other suitable materials could be used.
Claims
1. A mould for use in moulding a cladding directly onto an elongate member, the mould comprising at least two mould sections adapted to be assembled to one another upon the elongate member to define a mould cavity around it which is shaped to mould a cladding section having a sheath portion which surrounds and embraces the elongate member and at least one VIV suppression feature extending along the length of the cladding section, the mould having male and female ends, the male end being shaped to form a mating portion of the cladding section and the female end being shaped to receive and be closed by the mating portion of an existing cladding section, so that after moulding of a first cladding section the mould can be re-mounted with its female end closed by the mating portion of the first cladding section to form a second cladding section which is continuous with the first.
2. A mould as claimed in claim 1, in which the VIV suppression feature extends along a helix about the elongate member.
3. A mould as claimed in claim 1 or claim 2 in which the VIV suppression feature is an outwardly projecting strake.
4. A mould as claimed in claim 3 in which the mould sections are separable from one another along the line of at least one strake.
5. A mould as claimed in claim 4 in which the strakes and the lines of separation between two mould sections are helical.
6. A mould as claimed in any preceding claim which has the same internal section at (a) its female end and (b) a region adjacent the mating portion.
7. A mould as claimed in any preceding claim in which the mating portion is of reduced lateral dimension compared with the mould's female end.
8. A mould as claimed in any preceding claim whose male end is formed by an end cap secured to the mould sections.
9. A mould as claimed in claim 8 in which the end cap is made in two or more parts to enable it to be assembled around the elongate member.
10. A mould for use in moulding a cladding directly onto an elongate member, the mould comprising at least two mould sections adapted to be assembled to one another upon the elongate member to define a mould cavity around it which is shaped to mould a cladding section having a sheath portion which surrounds and embraces the elongate member and at least one strake projecting outwardly from the sheath portion and extending helically along the length of the cladding section, the mould sections meeting one another along the line of the said strake.
11. A mould as claimed in claim 10 in which the mould sections each have helical peripheral services which abut one another in the assembled mould.
12. A mould as claimed in claim 10 in which surfaces through which the mould sections meet each other are at the outermost extremity of the strake.
13. A mould as claimed in any of claims 10 to 12 in which the mould sections incorporate heating elements to aid curing.
14. Amould as claimed in any of claims 10 to 13 in which the mould cavity is shaped to form three helical strakes and the mould comprises three mould sections, each of which meets the two neighbouring sections along the line of a respective strake.
15. A mould as claimed in any of claims 10 to 14 which further comprises an end cap detachably securable to the mould sections to close one end of the mould cavity.
16. A mould substantially as herein described with reference to and as illustrated in the accompanying drawings.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0803922A GB2458110A (en) | 2008-03-03 | 2008-03-03 | Mould for forming vortex inducing suppression features on an elongate member |
GB0803922.4 | 2008-03-03 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2009109776A2 true WO2009109776A2 (en) | 2009-09-11 |
WO2009109776A3 WO2009109776A3 (en) | 2009-12-03 |
Family
ID=39315855
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2009/050212 WO2009109776A2 (en) | 2008-03-03 | 2009-03-03 | Mould for forming a cladding upon an elongate member |
Country Status (2)
Country | Link |
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GB (1) | GB2458110A (en) |
WO (1) | WO2009109776A2 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013143125A (en) * | 2012-01-11 | 2013-07-22 | Masangsoft Inc | Platform system of network infrastructure |
CN104985556A (en) * | 2015-07-09 | 2015-10-21 | 天津大学 | Installation tool for helical strakes in marine riser vortex-induced vibration restraining test |
CN106958426A (en) * | 2017-03-03 | 2017-07-18 | 中国石油大学(华东) | That assembles rotary blade revolves vortex-induced vibration of marine riser restraining device and method |
US10357907B2 (en) | 2016-06-08 | 2019-07-23 | Bayou Holdco, Inc. | System and method for applying moldable material to a pipe by injecting moldable material from a movable support |
US10960588B2 (en) | 2016-06-08 | 2021-03-30 | Bayou Holdco, Inc. | System and method for applying moldable material to a pipe |
US11999089B2 (en) | 2020-10-20 | 2024-06-04 | Bayou Holdco, Inc. | Transportable molding system for forming insulation on long pipes and related methods |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US5829772A (en) * | 1997-06-11 | 1998-11-03 | Columbia-Inland Corporation | Ride-on, human-powered vehicle drive and steering mechanism |
US9033614B2 (en) * | 2013-05-29 | 2015-05-19 | Ge Oil & Gas Uk Limited | Pipe components and methods of manufacture |
CN107701122B (en) * | 2017-11-01 | 2019-02-15 | 西南石油大学 | The standpipe vortex-induced vibration suppression device and method of a kind of Fenestration drainage in conjunction with swing |
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GB1220349A (en) * | 1967-09-14 | 1971-01-27 | Bibby Chemicals Ltd Formerly J | Improvements in or relating to the insulation of piping |
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GB2423739A (en) * | 2005-03-03 | 2006-09-06 | Probond | Moulding wear-protecting sleeve on a tubular article using a sealed mould |
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013143125A (en) * | 2012-01-11 | 2013-07-22 | Masangsoft Inc | Platform system of network infrastructure |
CN104985556A (en) * | 2015-07-09 | 2015-10-21 | 天津大学 | Installation tool for helical strakes in marine riser vortex-induced vibration restraining test |
US10357907B2 (en) | 2016-06-08 | 2019-07-23 | Bayou Holdco, Inc. | System and method for applying moldable material to a pipe by injecting moldable material from a movable support |
US10960588B2 (en) | 2016-06-08 | 2021-03-30 | Bayou Holdco, Inc. | System and method for applying moldable material to a pipe |
CN106958426A (en) * | 2017-03-03 | 2017-07-18 | 中国石油大学(华东) | That assembles rotary blade revolves vortex-induced vibration of marine riser restraining device and method |
CN106958426B (en) * | 2017-03-03 | 2018-04-20 | 中国石油大学(华东) | Assembling rotary blade revolves vortex-induced vibration of marine riser restraining device and method |
US11999089B2 (en) | 2020-10-20 | 2024-06-04 | Bayou Holdco, Inc. | Transportable molding system for forming insulation on long pipes and related methods |
Also Published As
Publication number | Publication date |
---|---|
WO2009109776A3 (en) | 2009-12-03 |
GB0803922D0 (en) | 2008-04-09 |
GB2458110A (en) | 2009-09-09 |
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