JP5656971B2 - Flexible tube for fluid transportation and method for manufacturing flexible tube for fluid transportation - Google Patents

Description

  The present invention relates to a fluid transport flexible tube for transporting oil and gas produced from a submarine oil and gas field and the like, and a method for manufacturing a fluid transport flexible tube.

  Conventionally, high-pressure oil and gas produced from a subsea oil and gas field are transported to a floating oil production facility by a flexible pipe for fluid transportation. The flexible tube is required to have internal pressure resistance, liquid tightness, waterproofness, and the like.

  As such a flexible pipe for transporting fluid, for example, a stainless steel interlock pipe excellent in flexibility and excellent in external pressure resistance and lateral pressure resistance during laying is used in the innermost layer, and an oil A plastic inner pipe with excellent gas and liquid tightness is provided, and a metal internal pressure reinforcement layer as an internal pressure reinforcement and a metal axial force reinforcement layer as an axial reinforcement are provided on the outer periphery, and the outermost layer is provided as an outer layer. A plastic sheath is provided as a waterproof layer (Patent Document 1).

JP 7-156285 A

  However, oil gas components pumped from the seabed usually contain corrosive gas such as hydrogen sulfide, carbon dioxide or supercritical carbon dioxide. In the flexible fluid transport pipe as in Patent Document 1, the plastic layer may be deteriorated by such a corrosive gas. Further, the corrosive gas that has permeated through the plastic layer may cause corrosion in the metal reinforcing layer.

  The present invention has been made in view of such problems, and is excellent in flexibility, and does not cause deterioration or corrosion in the metal reinforcing layer due to the corrosive gas contained in the fluid flowing inside. It is an object of the present invention to provide a fluid transport flexible tube and a method for manufacturing the fluid transport flexible tube, the effect of which is not reduced by repeated bending fatigue.

  In order to achieve the above-described object, the first invention includes a flexible tubular body, a shielding layer provided on the outer peripheral side of the tubular body, and a reinforcing layer provided on the outer peripheral side of the shielding layer. A protective layer provided on the outer peripheral side of the reinforcing layer, and a resin between the shielding layer and the tubular body and / or between the shielding layer and the reinforcing layer. A layer is formed, and the shielding layer is formed by a multilayer tape in which a metal layer is sandwiched between resins, and at least a part of the metal layer has a wave shape in a cross section of the multilayer tape. It is a flexible tube for fluid transportation.

  A water shielding layer may be further formed between the reinforcing layer and the protective layer, and the water shielding layer may be formed of a multilayer tape having a metal layer sandwiched between resins.

  In the plane of the multilayer tape, a wave crest in the corrugated shape of the metal layer may be formed at a predetermined angle with respect to the longitudinal direction of the multilayer tape.

  The corrugated shape of the metal layer may be formed in two different directions on the plane of the multilayer tape, and the corrugated peaks or troughs may be formed in a lattice shape. Here, in the present invention, the ridges or valleys are formed in a grid-like position, and the ridges or valleys are periodically and repeatedly formed in two different directions, with the result that the centers of the peaks or valleys are formed. Is arranged so as to be at each lattice point position of the periodic structure. In this case, the thickness of the metal layer is not constant, and the arrangement of irregularities accompanying the change in thickness is naturally included in the “lattice arrangement”, and the so-called embossed shape is also included in the “lattice arrangement”.

  An angle formed between a longitudinal direction of the multilayer tape and a wave crest portion of the corrugated shape of the metal layer substantially coincides with a winding angle of the multilayer tape with respect to a circumferential direction of the fluid transport flexible tube, and the multilayer In a state where the tape is wound, it is desirable that the extending direction of the wave crest portion substantially coincides with the circumferential direction of the fluid transporting flexible tube.

  The resin portion of the multilayer tape may be made of a resin having compatibility with the resin layer and having a lower melting point than the resin layer. Alternatively, at least the surface of the multilayer tape may be made of a rubber material, and the rubber material may be in close contact with the resin layer.

  The multilayer tape is spirally wound around the flexible tube for fluid transportation so that the ends in the width direction do not overlap each other, and covers the gap between the multilayer tapes on the inner layer side, Two or more layers of the multilayer tape may be wound, and the multilayer tape is spirally wound around the flexible tube for fluid transportation so that end portions in the width direction of the multilayer tape wrap around each other. May be attached.

  Further, the multilayer tape is wound so that the longitudinal direction of the multilayer tape substantially coincides with the axial direction of the fluid transport flexible tube, and the width direction of the multilayer tape is the circumferential direction of the fluid transport flexible tube. The lap portion of the multilayer tape may be formed so as to extend in the axial direction of the fluid transport flexible tube.

  According to the first invention, the shielding layer is provided between the tubular body and the resin layer, and the shielding layer is formed of a multilayer tape in which the metal layer is sandwiched with the resin. For this reason, the corrosive gas from the inner tube side is reliably shielded by the metal layer. Further, since the metal layer is sandwiched between the resins, the metal layer is not torn or bent when the shielding layer is constructed. For this reason, a shielding layer can be constructed reliably. Further, the metal layer does not damage the inner tube body, and it is possible to prevent a decrease in strength due to wear or fatigue of the metal layer or a decrease in strength of the tube body.

  Further, if a water-impervious layer is provided between the reinforcing layer and the protective layer, and the water-impervious layer is composed of a laminated film in which a metal film is sandwiched between resin films, seawater absorbed by the protective layer is Water shielding is ensured by the metal film. For this reason, an internal reinforcement layer does not corrode. Moreover, similarly to the shielding layer, the shielding film can be reliably constructed without the metal film being torn or bent during construction of the shielding layer. Further, the internal reinforcing layer is not damaged.

  Further, since the metal layer has a wave shape in the cross section of the multilayer tape, the multilayer tape (metal layer) can be deformed in the waveform direction in the state where the multilayer tape is wound. For this reason, it can suppress that a multilayer tape becomes a hindrance of a deformation | transformation with respect to the flexibility of the flexible tube for fluid transportation in the state by which the multilayer tape was wound.

  In addition, if the corrugated shape of the metal layer is formed in two different directions in the plane of the multilayer tape, and the corrugated peaks or valleys are formed in a lattice shape, the multilayer tape is used for fluid transportation. The flexibility of the flexible tube can follow any direction of deformation.

  In addition, if the corrugated crest of the metal layer is formed at a predetermined angle with respect to the longitudinal direction of the multilayer tape, the deformation direction of the multilayer tape (metal layer) is not only the width direction of the multilayer tape, It can be directed in a predetermined angular direction. For this reason, the angle formed between the longitudinal direction of the multilayer tape and the wave crest of the corrugated shape of the metal layer is substantially matched with the winding angle of the multilayer tape with respect to the circumferential direction of the fluid transport flexible tube. The extending direction of the wave crest in the state where the layer tape is wound can be made substantially coincident with the circumferential direction of the fluid transporting flexible tube. As a result, the traveling direction of the wave shape can be the tube axis direction. For this reason, the multi-layer tape (metal layer) has a large deformability with respect to the deformation direction (the axial direction of the fluid transport flexible tube) during bending of the fluid transport flexible tube, ensuring high flexibility. can do. In addition, since the stress in the tube axis direction during deformation can be relieved by the wave shape, the fatigue life of the multilayer tape is also improved.

  Further, if the resin constituting the shielding layer is compatible with the resin layer and is made of a material having a melting point lower than that of the resin layer, the resin layer and the resin portion are heated when the resin layer is extruded and coated. It is integrated by fusion, and there is no risk of deviation in bending and twisting machine history.

  In addition, at least the surface of the multilayer tape is made of a rubber material, and the adhesion between the multilayer tape and the resin layer becomes unnecessary by bringing the rubber material and the resin layer into close contact with each other. Therefore, when the flexible tube is used for a long period of time, it is possible to prevent the adhesive from deteriorating and forming a gap between the multilayer tape and the resin layer.

  The metal layer can have high long-term durability by using a material having excellent surface corrosion resistance such as stainless steel, aluminum, and clad steel.

  In addition, if multiple layers of tape are wound spirally so that the end portions in the width direction of each other do not wrap, and wound so that the gaps between the multilayer tapes of the upper and lower layers are filled with each other, it is surely corrosive Gas can be shielded. At this time, the winding direction of the multilayer tape may be spirally wound in the same direction or may be spirally wound in the opposite direction. In this way, the gap between the spirally wound tapes can be almost made up.

  Moreover, if a multilayer tape is wound helically so that the mutual width direction edge part may wrap, corrosive gas can be reliably shielded by forming a wrap part.

  Further, the multilayer tape is wound so that the longitudinal direction of the multilayer tape is substantially coincident with the axial direction of the fluid transport flexible tube and the width direction of the multilayer tape is the circumferential direction of the fluid transport flexible tube. Corrosive gas can be reliably shielded by wrapping the ends of the wound winding portions.

  According to a second aspect of the present invention, a flexible tubular body is fed in the tube axial direction, a shielding layer is formed on the outer circumferential side of the tubular body, a reinforcing layer is formed on the outer circumferential side of the shielding layer, A flexible layer for fluid transportation in which a protective layer is extrusion-coated on the outer peripheral side, and a resin layer is further extrusion-coated between the shielding layer and the tube and / or between the shielding layer and the reinforcing layer. In the method of manufacturing a tube, the shielding layer is formed of a multilayer tape in which a metal layer is sandwiched between resins, and the metal layer is at least partially wavy in the cross section of the multilayer tape, In the plane of the multilayer tape, the crest portion in the corrugated shape of the metal layer is formed at a predetermined angle with respect to the longitudinal direction of the multilayer tape, and the longitudinal direction of the multilayer tape and the metal layer The angle formed by the wave crest in the wave shape is the circumferential direction of the flexible tube for fluid transportation The shielding layer is wound by winding the multilayer tape so that the stretching direction of the wave crest portion substantially coincides with the circumferential direction of the fluid transporting flexible tube so that the winding angle of the multilayer tape is substantially coincident with the winding angle. Forming a flexible pipe for transporting fluid. The corrugated shape of the metal layer may be formed in two different directions on the plane of the multilayer tape, and the corrugated peaks or troughs may be formed in a lattice shape.

  According to the second aspect of the present invention, the shielding layer by the multilayer tape in which the metal layer is sandwiched with the resin is provided on the outer peripheral side of the tubular body, and the metal layer has a wave shape in the cross section of the multilayer tape. In a state where the tape is wound, the multilayer tape (metal layer) can be stretched and deformed in the wave shape direction.

  Further, the corrugated crest portion of the metal layer is formed at a predetermined angle with respect to the longitudinal direction of the multilayer tape, and the angle formed by the longitudinal direction of the multilayer tape and the corrugated portion of the corrugated shape of the metal layer is used for fluid transportation. Since the winding angle of the multilayer tape with respect to the circumferential direction of the flexible tube is substantially the same, the extending direction of the wave crest in the state where the multilayer tape is wound is substantially the same as the circumferential direction of the fluid transporting flexible tube. In addition, it is possible to ensure high flexibility that the multilayer tape (metal layer) can follow the deformation direction (the axial direction of the fluid transport flexible tube) when the fluid transport flexible tube is bent.

  According to the present invention, a flexible pipe for fluid transportation that is excellent in flexibility and does not cause deterioration or corrosion in a plastic layer or a metal reinforcing layer due to a corrosive gas contained in a fluid flowing through the inside. A manufacturing method of a flexible tube can be provided. In particular, the flexible tube for transporting fluid according to the present invention is provided with a shielding layer inside the tubular body, and the metal layer inside the shielding layer has a wave shape in the cross section, so that stress concentration of the metal layer is alleviated and high flexibility is achieved. And long-term reliability due to improved fatigue characteristics.

It is a figure which shows the flexible tube 1, (a) is a perspective view, (b) is sectional drawing. It is a figure which shows the structure of the multilayer tape 17, (a) is a perspective view, (b) is sectional drawing, A arrow direction view of (a). It is a figure which shows arrangement | positioning of the crest part of the multilayer tape 17, (a) is a top view, (b) is the BB sectional drawing of (a), (c) is CC sectional view of (a). The figure, (d) is the DD sectional view taken on the line of (a). It is a figure which shows the winding method of the multilayer tape 17, (a) is a general view, (b) is the E section enlarged view of (a). The figure which shows the winding state which wound the multilayer tape 17 helically. The figure which shows the structure of the multilayer tape 17a. The figure which shows the winding state which wound the multilayer tape 17 vertically. The figure which shows the winding state which wound the multilayer tape 17 vertically. It is a perspective view of the resin coating layer which shows the multilayer tape 17b, (a) is a perspective view, (b) is a top view. The figure which shows the deformation | transformation state of the multilayer tape 17. FIG. The figure which shows the effect of the shielding layer. The figure which shows other embodiment of a multilayer tape. Sectional drawing which shows the flexible tubes 1a and 1b. Sectional drawing which shows the flexible tube 1c.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1A and 1B are diagrams showing a flexible tube 1, in which FIG. 1A is a perspective view and FIG. 1B is a cross-sectional view. The flexible tube 1 is mainly composed of an interlock tube 3, which is a tubular body, a resin layer 5, a shielding layer 7, an internal pressure-resistant reinforcing layer 9, an axial force reinforcing layer 11, a protective layer 13, and flooring layers 15a and 15b. Is done.

  The interlock pipe 3 is located in the innermost layer of the flexible pipe 1 and is made of stainless steel having excellent buckling strength against external pressure and good corrosion resistance. The interlock pipe 3 is formed by forming a tape into a S-shaped cross section and meshing and connecting with each other at the S-shaped portion, and has flexibility. Instead of the interlock pipe 3, any other form of pipe can be used as long as it has the same flexibility and excellent buckling strength.

  A resin layer 5 is provided on the outer peripheral side of the interlock pipe 3. The resin layer 5 shields the fluid flowing through the interlock pipe 3. As the resin layer 5, for example, nylon or polyvinyldenfluoride (PVDF) that can withstand high temperatures of 90 ° C. or more and has excellent oil resistance can be used. In addition, the outer peripheral side of the interlock pipe 3 means the outer side of the interlock pipe 3 in a cross section, and includes that there is another layer structure between the interlock pipe 3 and the resin layer 5. . In the following description, in the positional relationship of each layer, it is simply referred to as “periphery”, but it is needless to say that similarly, those having other layer structures between the respective layers are included.

  For example, a floor layer 15a is provided between the interlock pipe 3 and the resin layer 5 as necessary. The floor layer 15a is a layer for leveling the uneven shape on the outer periphery of the interlock pipe 3 and can be deformed following the flexibility of the interlock pipe 3. That is, the floor layer 15a has a certain thickness, such as a non-woven fabric, and serves as an uneven cushion on the outer periphery of the interlock tube 3.

  Note that the floor layer is provided as necessary, and in the following description, a case where the floor layer is provided will be described, but it is not always necessary and can be omitted. Therefore, in the following figures (the figures other than FIG. 1A), the illustration of the floor layer is omitted.

  A shielding layer 7 is provided on the outer periphery of the resin layer 5. The shielding layer 7 shields corrosive gas and supercritical substance from the fluid flowing in the interlock pipe 3. The shielding layer 7 is formed by a multilayer tape described later. The configuration of the shielding layer 7 will be described later in detail.

  On the outer periphery of the shielding layer 7, an internal pressure-resistant layer 9 is provided. The internal pressure-resistant reinforcing layer 9 is a reinforcing layer against the internal pressure of the fluid flowing mainly in the interlock pipe 3. The internal pressure proof reinforcing layer 9 is formed, for example, by being wound at a short pitch so that metal tapes having a cross-sectional C shape or a Z-shaped cross section face each other and overlap each other in the axial direction. The internal pressure proof reinforcing layer 9 has a configuration in which a metal tape is wound at a predetermined pitch as described above, and can follow bending deformation and torsional deformation of the interlock pipe 3.

  An axial force reinforcing layer 11 is provided on the outer periphery of the internal pressure-resistant reinforcing layer 9. The axial force reinforcing layer 11 is a reinforcing layer for mainly suppressing the interlock pipe 3 from being deformed (extended) in the axial direction of the flexible pipe 1. The axial force reinforcing layer 11 is formed by alternately winding two layers of metal reinforcing strips at a long pitch. The axial force reinforcing layer 11 can be deformed following the flexibility of the interlock 3.

  In addition, you may provide the floor layer 15b which is the resin tape made from polyethylene between the internal pressure-proof reinforcement layer 9 and the axial force reinforcement layer 11 as needed. In addition, a floor layer 15c, which is a polyethylene resin tape, may be provided between two layers of reinforcing strips that are spirally wound in opposite directions. The resin tape used for the floor layer may be made of a resin material other than polyethylene as long as the strength and corrosion resistance are equivalent. The floor layers 15b and 15c prevent the reinforcing members from being worn by rubbing when the reinforcing members follow the deformation of the flexible tube 1. Even in this case, it is said that the axial force reinforcing layer 11 is provided on the outer peripheral side of the internal pressure resistant reinforcing layer 9 regardless of the presence or absence of the floor layer. In the following, unless otherwise specified, the internal pressure proof reinforcing layer 9 and the axial force reinforcing layer 11 are collectively referred to as a reinforcing layer.

  A floor layer 15d is provided on the outer periphery of the axial force reinforcing layer 11 as necessary. The floor layer 15 d is a layer for leveling the uneven shape on the outer periphery of the axial force reinforcing layer 11 and can be deformed following the flexibility of the interlock pipe 3. Since the floor layer 15d has the same configuration as the floor layer 15a, description thereof is omitted.

  A protective layer 13 is provided on the outer periphery of the floor layer 15d. The protective layer 13 is a layer for preventing, for example, seawater from entering the reinforcing layer. The protective layer 13 can be made of, for example, non-crosslinked resin made of nylon, polyethylene, polyarylate resin or polyamide synthetic resin. As described above, each layer constituting the flexible tube 1 follows the bending deformation or torsional deformation of the flexible tube 1 and has flexibility.

  The flexible tube 1 is manufactured as follows. The interlock pipe 3 manufactured in advance is sent in the axial direction, and a floor tape is wound around the interlock pipe 3 as necessary to form the floor layer 15a. The interlock pipe 3 on which the floor layer 15a is formed is sent to the extruder, and the extruder pushes the resin to the outer peripheral portion to form the resin layer 5. Further, a multilayer tape manufactured in advance is supplied from the multilayer tape feeder. The multilayer tape is spirally wound, or is supplied so that the longitudinal direction of the multilayer tape is substantially the same as the axial direction of the interlock pipe 3, is formed in a forming machine, and is longitudinally wound. . Thus, the shielding layer 7 is formed. The feeding speed from the feeder of the multilayer tape is the speed obtained by superimposing the winding speed when the pipe is considered to be stationary in the extrusion speed of the interlock pipe 3 in both the spiral winding and the longitudinal winding in the axial direction. Need to be sent out.

  Further, a reinforcing layer is formed on the outer peripheral side of the shielding layer 7 by a reinforcing tape winding machine, and a protective layer 13 is formed on the outermost peripheral part by an extruder, and is wound up to a predetermined length. Thus, the flexible tube 1 is manufactured.

  Next, the multilayer tape 17 constituting the shielding layer 7 will be described. 2 is a view showing the multilayer tape 17, FIG. 2 (a) is a perspective view, FIG. 2 (b) is a view in the direction of arrow A in FIG. 2 (a), and a sectional view of the multilayer tape 17. is there. The multilayer tape 17 includes a metal layer 19 and a resin coating portion 21. The metal layer 19 is sandwiched between the resin coating portions 21.

  The metal layer 19 may be thin on the film and easily processed, and may be excellent in corrosion resistance. For example, stainless steel, aluminum, clad steel clad with a material having good corrosion resistance on the outer surface, or the like can be used. The metal layer 19 has a thickness of about 0.05 mm, for example, and the multilayer tape 17 as a whole may be about 0.2 to 0.3 mm, for example.

  The resin coating portion 21 is a resin member and can prevent the metal layer 19 from being bent, torn, or wrinkled when the shielding layer 7 is constructed. The material of the resin coating portion 21 will be described later.

  As shown in FIG. 2B, the metal layer 19 has a wave shape in the cross section. Such a metal layer 19 may be formed by extrusion-coating a resin on a corrugated metal film, or may be installed in a corresponding mold to integrate the resin by injection. Alternatively, a resin member having a corrugated shape and a metal film, which are separately formed, may be integrated by a known technique such as adhesion or pressure bonding. Moreover, a metal layer can also be formed by vapor deposition etc. on the resin member by which the surface was previously formed in the waveform.

  Here, the metal layer 19 has a wave shape having a crest and a trough, and the crest (or trough) is referred to as a crest 23. That is, in the cross-sectional example shown in FIG. 2B, there are five crest portions 23 on the mountain side (upper side).

  3A is a plan view of the multilayer tape 17, FIG. 3B is a cross-sectional view taken along line BB in FIG. 3A, and FIG. 3C is a cross-sectional view taken along line C- in FIG. C line sectional drawing, FIG.3 (d) is a figure which shows DD line sectional drawing of Fig.3 (a). The dotted line in the figure represents the position of the wave crest 23. The wave crest 23 is continuously formed at a predetermined angle with respect to the longitudinal direction of the multilayer tape 17. That is, in the example of FIG. 3A, the wave crest 23 is formed obliquely by an angle K with respect to the longitudinal direction of the multilayer tape 17.

  Accordingly, the wave shape differs depending on the cross-sectional position. For example, the wave crest portion 23 at the left end in FIG. 3B continuously shifts in the right direction in the figure as it goes to FIGS. 3C and 3D. It is formed.

  Next, a method for winding the multilayer tape 17 will be described. FIG. 4A is a view showing a method of spirally winding the multilayer tape 17 around the outer periphery of the resin layer 5, and FIG. 4B is an enlarged view of a portion E in FIG. 4A. For example, as shown in FIG. 4A, the multilayer tape 17 is wound in a spiral shape (in the direction of arrow F in the figure). For example, while the resin layer 5 is extrusion coated, the multilayer tape 17 is supplied and wound in the subsequent process.

  FIG. 5 is an axial cross-sectional view showing a state in which the multilayer tape 17 is wound around the outer periphery of the resin layer 5. As shown in FIG. 5 (a), the multilayer tape 17 is formed on the outer periphery of the resin layer 5 with a slight gap so that the end portions in the width direction of the multilayer tape 17 do not overlap each other (so as not to wrap). Further, the multilayer tape 17 may be wound around the upper layer (outer layer) in the same manner by shifting the winding position so as to cover the gap between the lower layer (inner layer) multilayer tape 17 on the outer periphery. . As for the winding of the multilayer tape, it is preferable that the lower layer (inner layer) tape and the upper layer (outer layer) tape are wound in opposite directions because the tension applied to the interlock pipe at the time of winding is balanced.

  Moreover, as shown in FIG.5 (b), the multilayer tape 17 may be wrapped and wound so that the width direction edge part of the multilayer tape 17 may mutually overlap. Even if it winds by any method of FIG. 5, the multilayer tape 17 can be wound in a shielding layer without gap. For the integration of the multilayer tape 17 and the resin layer, any known means such as adhesion or fusion can be used.

  The material of the resin coating portion 21 is not particularly limited, but may be a rubber material (for example, ethylene rubber, ethylene propylene rubber, silicon rubber, urethane rubber, butyl rubber, etc.). By doing in this way, the friction coefficient of the resin layer 5 and the resin coating | coated part 21 (multilayer tape 17) becomes large. For this reason, the resin layer 5 and the multilayer tape 17 do not adhere and shift.

  In addition, when the resin coating part 21 whole is made of a rubber material, there is a possibility that the adhesiveness with the metal layer 19 is inferior. For this reason, as shown in FIG. 6, it is good also considering the resin coating part 21 as a multilayer. That is, in the multilayer tape 17a shown in FIG. 6, the resin covering portion 21 is provided with a resin layer excellent in adhesiveness with the metal layer 19 in the inner layer, and the rubber portion 21a is formed only with the outer layer by a rubber material. Also good.

  As shown in FIG. 4B, in the front view (or plan view) of the flexible tube, the axial direction of the flexible tube in a state where the multilayer tape 17 is spirally wound around the outer periphery of the resin layer 5. H and the circumferential direction G of the flexible tube are perpendicular to each other. The angle formed by the winding direction I of the multilayer tape 17 with respect to the circumferential direction G of the flexible tube is J. Further, as described above, the angle formed by the longitudinal direction I of the multilayer tape 17 and the wave crest 23 is K. Here, the winding direction I of the multilayer tape 17 coincides with the longitudinal direction of the multilayer tape 17.

  Therefore, the angle J formed by the winding direction I of the multilayer tape 17 and the circumferential direction G of the flexible tube and the angle formed by the longitudinal direction I of the multilayer tape 17 and the wave crest 23 should be approximately equal to K. Thus, the direction (stretching direction) in which the wave crest portion 23 is formed substantially coincides with the circumferential direction G of the flexible tube. That is, by setting the winding angle (J) of the multilayer tape 17 in advance and using the multilayer tape 17 having the crest portion inclined at an angle (K) corresponding thereto in the plan view, The extending direction can be made substantially coincident with the circumferential direction of the fluid transporting flexible tube. Here, the angle (J) formed by the winding direction I and the circumferential direction G of the flexible tube and the angle (K) formed by the longitudinal direction I of the multilayer tape 17 and the wave crest 23 cause a slight deviation. Consider the case. For example, when the outer diameter of the interlock pipe is D, the deviation in the axial direction per winding rotation when the tape is not completely parallel to the circumferential direction is expressed as D · π · tan (J−K). Here, for example, if the outer diameter D of the interlock pipe is 150Φ, when J-K is 5 °, tan 5 ° = 0.087, and the tape winding direction is shifted by about 41 mm, and half The deviation per rotation is about 20 mm. Therefore, the angle deviation is preferably 5 ° or less. Further, the amount of deviation with a deviation angle of 2.5 ° is about half of the above, which is more preferable.

  FIG. 7 is a diagram showing another embodiment showing a forming process when the multilayer tape 17 is wound around the interlock pipe 3 on which the resin layer 5 is formed by vertical winding. The multilayer tape 17 may be wound vertically as shown in FIG. In this case, the multilayer tape 17 is sent to the interlock pipe 3 so that the longitudinal direction of the multilayer tape 17 is substantially the same as the axial direction of the interlock pipe 3. At this time, both sides of the multilayer tape 17 are bent in a U shape so as to wrap the entire interlock pipe 3 (resin layer 5).

  Further, the interlock pipe 3 (resin layer 5) is wrapped by the multilayer tape 17. That is, both end portions of the multilayer tape 17 are wrapped with the outer peripheral portion of the resin layer 5, and the resin layer 5 is wrapped with the multilayer tape 17. That is, the wrap portion 25 is formed along the axial direction of the interlock pipe 3. As described above, the shielding tape 7 may be formed by winding the multilayer tape 17 around the resin layer 5 by vertical winding.

  8 is a view corresponding to FIG. 4, FIG. 8 (a) is a view showing a state in which the multilayer tape 17 is vertically wound around the outer periphery of the resin layer 5, and FIG. 8 (b) is a view shown in FIG. It is an enlarged view corresponding to b). As shown in FIG. 8A, the wrap portion 25 is formed so as to extend in the axial direction of the flexible tube (in the direction of arrow L in the figure).

  At this time, as shown in FIG. 8B, the axial direction H of the flexible tube and the circumferential direction G of the flexible tube are perpendicular to each other. Further, the longitudinal direction I of the multilayer tape 17 and the axial direction H of the flexible tube coincide with each other. Therefore, if the angle formed by the circumferential direction G of the flexible tube and the axial direction H of the flexible tube is J, J is approximately 90 degrees. Further, as described above, the angle K formed by the longitudinal direction I of the multilayer tape 17 and the wave crest 23 is also 90 °.

  Therefore, even in the case of longitudinal winding, the angle J (90 °) of the circumferential direction G of the flexible tube with respect to the winding direction I of the multilayer tape 17, the longitudinal direction I of the multilayer tape 17 and the wave crest 23 The angle formed by substantially matching K (90 °) makes it possible to substantially match the extending direction of the wave crest portion 23 with the circumferential direction of the fluid transporting flexible tube.

  FIG. 9 is a view showing another multilayer tape 17b, FIG. 9A is a perspective view of the multilayer tape 17b (a perspective view of the resin coating portion 21), and FIG. 9B is a conceptual plan view of the metal layer 19. FIG. It is. In the present invention, a multilayer tape 17b as shown in FIG. 9 may be used. The multilayer tape 17b has substantially the same configuration as the multilayer tape 17, but the form of the metal layer 19 is different.

  As described above, the wave crest portion 23 is continuously formed in the multilayer tape 17. That is, as shown in FIG. 3, the multilayer tape 17 has a wave shape in one direction, and does not have a wave shape in a cross section along the wave crest portion 23. On the other hand, the multilayer tape 17b has a wave shape in two different directions (the S direction and the T direction in FIG. 9B). Therefore, the peak part 27 and the trough part 29 (wave peak part) are formed in a grid | lattice form. The cross-sectional view taken along the line RR in FIG. 9B is the same as the multilayer tape 17 (FIG. 2B).

  As such a multi-layered tape 17b, the resin may be extruded and coated on a metal film that has been embossed as shown in FIG. 9, or the resin may be integrated by injection by installing in a corresponding mold. May be. Or the resin member and metal film which have the corresponding uneven | corrugated shape each formed separately and integrated by well-known techniques, such as adhesion | attachment and pressure bonding, may be used. Moreover, a metal layer can also be formed by vapor deposition on a resin member whose surface is previously formed in an embossed shape.

  Such a multilayer tape 17b is wound around the outer periphery of the resin layer 5 by any of the methods shown in FIG. 4 or FIG. For the multilayer tape 17b, the parallel direction of the wave crests as described above (for example, the S direction or the T direction in FIG. 9B) and the winding angle of the multilayer tape 17b may be matched. Further, the multilayer tape 17b can be deformed in any direction. For this reason, sufficient flexibility can be obtained even if the winding angle and the parallel direction of the wave crests (S direction or T direction in FIG. 9B) do not completely coincide.

  Next, the function of the multilayer tape 17 when the flexible tube 1 is deformed will be described. FIG. 10 is a view showing a state in which the flexible tube 1 is deformed. As shown in FIG. 10A, when the flexible tube 1 is bent and deformed (in the direction of arrow M in the drawing), the bending outer periphery side (N portion in the drawing) of the flexible tube 1 becomes tensile deformation.

  FIG.10 (b) is a schematic diagram which shows the state of the multilayer tape 17 in the N section of Fig.10 (a). In addition, FIG.10 (b) is a figure which shows the state by which the multilayer tape 17 was spirally wound, for example. When the flexible tube 1 is bent and deformed locally and tensile deformation occurs locally, the multi-layer tape 17 wound around the portion also undergoes tensile deformation in the width direction and tries to follow the bending of the flexible tube 1 ( Arrow direction Q in the figure). At this time, the resin coating portion 21 can be easily deformed following the elastic deformability of the resin.

  On the other hand, since the metal layer 19 has a wave shape, the metal layer 19 can easily follow the deformation by the expansion and contraction of the wave. In particular, since the wave crest portion 23 is formed so as to extend in the circumferential direction of the flexible tube 1, the expansion / contraction deformation direction due to the wave shape corresponds to the axial direction of the flexible tube 1. For this reason, the multilayer tape 17 (shielding layer 7) can easily follow the deformation of the flexible tube 1 and deform. That is, the winding of the multilayer tape 17 having the metal layer 19 does not hinder the flexibility (deformation) of the flexible tube 1.

  Next, the function of the shielding layer 7 will be described. FIG. 11 is a view showing a cross section of the flexible tube 1, FIG. 11 (a) is an axial cross-sectional view, and FIG. 11 (b) is an enlarged view of a multilayer tape 17 constituting the shielding layer 7. . As shown in FIG. 11A, fluid such as oil or gas flows in the interlock pipe 3. As described above, oil, gas, and the like may contain hydrogen sulfide, carbon dioxide, or supercritical carbon dioxide that is a corrosive gas.

  Since the interlock pipe 3 does not have liquid-tightness / airtightness, the resin layer 5 provided on the outer peripheral portion of the interlock pipe 3 is usually in contact with the fluid. Further, the flow of corrosive gas from the interlock pipe 3 in the circumferential direction (in the direction of arrow O in the drawing) may permeate the resin layer 5.

  However, in the flexible tube 1 according to the present invention, the shielding layer 7 is provided on the outer peripheral surface of the resin layer. Therefore, as shown in FIG. 11B, the shielding layer 7 reliably shields the corrosive gas contained in the fluid in the inner metal layer 19 (in the direction of arrow P in the figure). Therefore, the reinforcing layers (the internal pressure resistant reinforcing layer 9 and the axial force reinforcing layer 11) are not deteriorated by the corrosive gas.

  As described above, according to the flexible tube 1 according to the first embodiment, since the shielding layer 7 is provided on the outer periphery of the resin layer 5, fluid transportation in which the reinforcing layer is not deteriorated by the fluid flowing inside. A flexible tube can be obtained. Further, since the shielding layer 7 is composed of the multilayer tape 17 in which the metal layer 19 is sandwiched between the resin coating portions 21, the flow of the corrosive gas from the interlock pipe 3 side in the circumferential direction of the pipe body is caused by the metal layer 19. It is reliably shielded and the reinforcing layer does not deteriorate.

  Further, since the metal layer 19 is sandwiched between the resin coating portions 21, the metal layer 19 is not torn or bent when the shielding layer 7 is constructed, and the shielding layer 7 can be constructed with certainty. Furthermore, since the metal layer 19 does not directly contact the interlock pipe 3, the interlock pipe 3 is not damaged during manufacture.

In addition, since the metal layer 19 has a wave shape in the cross section of the multilayer tape 17, the multilayer tape 17 (metal layer 19) can be easily stretched and deformed in the waveform direction when the multilayer tape 17 is wound. It is. In particular, the corrugated crest portion 23 of the metal layer 19 is formed at a predetermined angle with respect to the longitudinal direction of the multilayer tape 17, and is formed by the longitudinal direction of the multilayer tape 17 and the corrugated portion 23 in the corrugated shape of the metal layer 19. By making the angle substantially coincide with the winding angle of the multilayer tape 17 with respect to the circumferential direction of the flexible tube 1, the extending direction of the wave crest portion 23 in a state where the multilayer tape 17 is wound is set to the flexible tube 1. Can be made substantially coincident with the circumferential direction. Therefore, the multilayer tape 17 (metal layer 19) easily follows the deformation direction when the flexible tube 1 is bent, and high flexibility can be ensured. Further, by forming the metal layer 19 in an embossed shape, a wave shape is formed in any two different directions. For this reason, it can follow a deformation | transformation with respect to any direction, and is excellent also in the productivity of a multilayer tape.
Moreover, by making the metal layer 19 into a wave shape, when the flexible tube is bent, the metal layer 19 can easily follow the deformation, and local stress concentration can be reduced. For this reason, local excessive stress is not given to the metal layer 19. Therefore, long-term repeated bending fatigue characteristics can be improved, and a flexible tube excellent in long-term reliability can be obtained.

  Next, another embodiment will be described. In the following embodiments, components having the same functions as those of the flexible tube 1 shown in FIGS. 1 to 11 are denoted by the same reference numerals as those in FIGS. 1 to 11 to avoid redundant description.

  FIG. 12 is a diagram showing another embodiment of the shape of the metal layer 19 in the cross section of the multilayer tape. The shape of the metal layer 19 in the cross section of the multilayer tape is not limited to the above-described example. For example, as in the multilayer tape 30 shown in FIG. May be. Even in this case, the wave crest portion 23 is formed at a predetermined angle with respect to the longitudinal direction of the multilayer tape 30, so that the same effect as that of the multilayer tape 17 is achieved.

  Further, for example, the wave shape may be a rectangular wave as in the multilayer tape 40 shown in FIG. Further, like the multilayer tape 50 shown in FIG. 12C, the wave shape may be a triangular wave. Even in this case, by forming the wave crest portion 23 at a predetermined angle with respect to the longitudinal direction of the multilayer tape, the same effect as the multilayer tape 17 can be obtained. The wave shape is not limited to these embodiments, and may be any form that can be expanded and contracted. Such various wave shapes may be formed in one direction (similar to the multilayer tape 17) or may be formed in two directions (similar to the multilayer tape 17b).

  Further, as shown in FIG. 13A, the resin layer 5 may be formed on the outer peripheral side of the shielding layer 7. Even in this case, since hydrogen sulfide and the like are shielded by the shielding layer 7, it is possible to prevent hydrogen sulfide and the like from entering the reinforcing layer.

  Similarly, as shown in FIG. 13B, the resin layers 5a and 5b may be formed on both sides (inner periphery and outer periphery) of the shielding layer 7. Even in this case, since hydrogen sulfide and the like are shielded by the shielding layer 7, it is possible to prevent hydrogen sulfide and the like from entering the reinforcing layer. That is, the resin layer may be formed on at least one of the inner peripheral side or the outer peripheral side of the shielding layer 7.

  In the case where the resin layer is formed on the outer peripheral side of the shielding layer 7, in order to make the shielding layer 7 function more stably, as the resin of the resin coating portion of the multilayer tape constituting the shielding layer 7, a resin is used. A resin having a melting point lower than that of the resin forming the layer 5 (5b) and having compatibility with the resin forming the resin layer 5 can be used.

  If the resin coating part 21 and the resin layer 5 (5b) are compatible and the melting point of the resin coating part 21 is low, the resin layer 5 is formed when the resin of the resin layer 5 is pushed out to the outer peripheral side of the shielding layer 7. (5b) and the resin coating portion 21 are easily integrated with each other. Therefore, when the resin layer 5 (5b) is formed, there is no displacement or twist between the shielding layer 7 and the resin layer 5 (5b), and the flexible tube 1 is shielded when it is bent. Part of the layer 7 is not damaged.

  As a material having such a relationship, for example, the resin covering portion 21 may be nylon 12 and the resin layer 5 (5b) may be nylon 11. As described above, the resin coating portion 21 (or the surface thereof) may be made of a rubber material.

  Further, as shown in FIG. 14, a water shielding layer 31 may be formed between the reinforcing layer (the floor layer 15 d) and the protective layer 13. The water shielding layer 31 has the same configuration as the shielding layer 7. That is, the multilayer films 17, 17a, 17b are configured to be wound around the outer periphery of the reinforcing layer (the floor layer 15d) by the same method as shown in FIG. 4 or FIG. Further, the protective layer 13 is extrusion coated on the outer peripheral portion of the water shielding layer 31.

  In this case, the melting point of the resin coating part of the multilayer film constituting the water shielding layer 31 is lower than the melting point of the resin forming the protective layer 13, and the resin constituting the resin coating part and the resin forming the protective layer 13 And may have compatibility. If the resin coating part and the protective layer 13 are compatible and the melting point of the resin coating part is lower than the melting point of the protective layer 13, when the resin of the protective layer 13 is extruded, the protective layer 13 and the multilayer tape Are easy to integrate with each other. For this reason, when the protective layer 13 is formed, a shift or the like does not occur between the water shielding layer 31 and the protective layer 13.

  As a material having such a relationship, for example, the resin coating portion may be nylon 12, and the protective layer 13 may be nylon 11. Alternatively, the resin coating portion may be low density polyethylene (LDPE) and the protective layer 13 may be high density polyethylene (HDPE).

  Moreover, the resin coating | coated part (surface) can also be comprised with rubber members (for example, ethylene rubber, ethylene propylene rubber, silicon rubber, urethane rubber, butyl rubber, etc.). By doing in this way, the friction coefficient of the protective layer 13 and the resin coating part becomes large. For this reason, the protective layer 13 and the multilayer films 17, 17a, and 17b do not adhere and shift.

  The flexible tube 1c configured in this manner is usually used by being submerged or floating. Therefore, the protective layer 13 is always in contact with seawater. Since the protective layer 13 is made of resin, it has a certain level of waterproofness, but the resin itself has a slight water absorption. For this reason, the seawater component penetrates into the protective layer 13 slightly. In particular, a high water pressure is applied to the seabed, and there is a great risk of penetration of seawater components into the protective layer 13 when used for a long time.

  Seawater components usually cause metal corrosion. Therefore, when a metal reinforcing layer is located on the inner peripheral portion of the protective layer 13, the reinforcing layer is deteriorated due to corrosion, and the flexible tube itself may be damaged. However, in the flexible tube 1 c according to the present invention, the water shielding layer 31 is provided on the inner peripheral surface of the protective layer 13. Therefore, it is possible to prevent the seawater component from reaching the reinforcing layer inside the water shielding layer 31. That is, the reinforcement layer is not deteriorated by the seawater component by the water shielding layer 31.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs.

DESCRIPTION OF SYMBOLS 1, 1a, 1b, 1c ......... Flexible tube 3 ......... Interlock tube 5 ......... Resin layer 7 ......... Shielding layer 9 ......... Internal pressure-proof reinforcement layer 11 ......... Axial force reinforcement layer 13 ... ...... Protective layer 15a, 15b, 15c, 15d ......... Base floor layer 17, 17a, 17b, 30, 40, 50 ......... Multilayer tape 19 ......... Metal layer 21 ......... Resin coating part 21a ... ... Rubber part 23 ......... Wave part 25 ......... Lap part 27 ......... Mountain part 29 ......... Tani part 31 ......... Water-impervious layer

Claims (9)

A flexible tube;
A shielding layer provided on the outer peripheral side of the tubular body;
A reinforcing layer provided on the outer peripheral side of the shielding layer;
A protective layer provided on the outer peripheral side of the reinforcing layer;
Comprising at least
A resin layer is further formed between the shielding layer and the tubular body and / or between the shielding layer and the reinforcing layer,
The shielding layer is formed of a multilayer tape in which a metal layer is sandwiched between resins,
The metal layer is at least partially wavy in the cross section of the multilayer tape,
In the plane of the multilayer tape, a wave crest in the corrugated shape of the metal layer is formed in two different directions at a predetermined angle with respect to the longitudinal direction of the multilayer tape. A flexible tube for transporting fluid, characterized in that valleys are formed in a lattice shape. A water shielding layer is further formed between the reinforcing layer and the protective layer,
The flexible tube for fluid transportation according to claim 1, wherein the water shielding layer is formed of a multilayer tape in which a metal layer having at least a part of a wave shape in a cross section is sandwiched between resins.   One angle between the longitudinal direction of the multilayer tape and the formation direction of the wave crest in the corrugated shape of the metal layer is substantially the same as the winding angle of the multilayer tape with respect to the circumferential direction of the fluid transporting flexible tube. The formation direction of the wave crest portion substantially coincides with the circumferential direction of the flexible tube for fluid transportation in a state where the multilayer tape is wound. Flexible tube for fluid transportation.   The flexible tube for fluid transportation according to claim 1, wherein the resin portion of the multilayer tape is made of a resin having compatibility with the resin layer and having a lower melting point than the resin layer.   The flexible pipe for transporting fluid according to claim 1, wherein at least a surface of the multilayer tape is made of a rubber material, and the rubber material is in close contact with the resin layer.   The multilayer tape is spirally wound around the flexible tube for fluid transportation so that the ends in the width direction do not overlap each other, and covers the gap between the multilayer tapes on the inner layer side, The flexible pipe for fluid transportation according to claim 1, wherein two or more layers of the multilayer tape are wound.   2. The fluid transport according to claim 1, wherein the multilayer tape is spirally wound around the flexible tube for fluid transport such that end portions in the width direction of the multilayer tape wrap around each other. Flexible tube.   The multilayer tape is wound so that the longitudinal direction thereof substantially coincides with the axial direction of the fluid transport flexible tube, and the width direction of the multilayer tape is the circumferential direction of the fluid transport flexible tube, The flexible tube for fluid transportation according to claim 1, wherein a wrap portion of the multilayer tape extends in an axial direction of the flexible tube for fluid transportation. A flexible tubular body is fed in the tube axis direction, a shielding layer is formed on the outer circumferential side of the tubular body, a reinforcing layer is formed on the outer circumferential side of the shielding layer, and a protective layer is formed on the outer circumferential side of the reinforcing layer. This is a method for manufacturing a flexible tube for fluid transportation in which a resin layer is further extrusion-coated and a resin layer is further extrusion-coated between the shielding layer and the tube body and / or between the shielding layer and the reinforcing layer. And
The shielding layer is formed of a multilayer tape in which a metal layer is sandwiched between resins, and the metal layer is at least partially wavy in the cross section of the multilayer tape,
The corrugated shape of the metal layer is formed in two different directions in the plane of the multilayer tape, and the corrugated peaks or troughs are formed in a lattice shape,
In the plane of the multilayer tape, the wave crest forming direction in the wave shape of the metal layer is formed at a predetermined angle with respect to the longitudinal direction of the multilayer tape,
One angle formed between the longitudinal direction of the multilayer tape and the wave crest forming direction in the corrugated shape of the metal layer substantially coincides with the winding angle of the multilayer tape with respect to the circumferential direction of the fluid transport flexible tube. Then, the shielding layer is formed by winding the multilayer tape so that the extending direction of the wave crest portion substantially coincides with the circumferential direction of the fluid-transporting flexible tube. A manufacturing method of a flexible tube.

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