JP5653663B2 - Flexible pipe for fluid transportation - Google Patents

Description

  The present invention relates to a flexible tube for fluid transportation that can transport a fluid such as low-temperature liquefied carbon dioxide.

  Conventionally, a fluid transport flexible tube having a plastic layer is used to transport a high-pressure fluid such as oil. The flexible tube for fluid transportation is required to have characteristics such as flexibility and resistance to internal pressure.

  As such a flexible tube for transporting fluid, for example, a flexible fluid transport tube in which a plastic tube is formed outside the interlock tube, and an inner pressure reinforcing layer, an axial force reinforcing layer, and an anticorrosion layer are formed on the outer periphery thereof. (Patent Document 1).

JP 7-156285 A

  In the flexible fluid transport pipe described in Patent Document 1, nylon that is excellent in oil resistance is used as the plastic pipe for use in transporting oil. However, when transporting liquefied carbon dioxide or the like, polyethylene that is lower in cost and excellent in processability can be used.

  Since carbon dioxide liquefies at about 5 MPa even at room temperature and can be handled at about 2 MPa if it is about 20 ° C. below zero, it is necessary to use a flexible tube for fluid transportation in which an internal pressure-proof reinforcing layer is formed with a reinforcing tape or the like. it can.

  However, in a tanker or the like that transports liquefied carbon dioxide, the higher the pressure of the liquefied carbon dioxide that is transported, the stronger the pressure-resistant structure is required, and thus the manufacturing cost of the transport equipment becomes extremely high. Therefore, transportation at a low pressure at the atmospheric pressure level is desired.

  In order to handle the liquefied carbon dioxide at about atmospheric pressure, it is necessary to lower the liquefied carbon dioxide from around −50 ° C. to a temperature near the triple point of CO 2. However, the plastic layer used in the flexible tube for fluid transportation as described above may be brittlely broken at such a low temperature. EPDM (ethylene propylene diene rubber) is a material that can withstand such low temperatures, but it is difficult to apply as a flexible tube for fluid transportation that always undergoes repeated repeated bending because of its poor bending resistance. there were.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a flexible tube for fluid transportation that can withstand use at low temperatures and has excellent bending resistance.

In order to achieve the above-described object, the present invention provides a flexible tube, a resin layer provided on the outer periphery of the tube, and an internal pressure-resistant reinforcing layer provided on the outer periphery of the resin layer. And an axial force reinforcing layer provided on the outer peripheral portion of the internal pressure-proof reinforcing layer, and a protective layer provided on the outer peripheral portion of the axial force reinforcing layer, wherein the resin layer is (A) ethylene propylene 10 to 40 parts by mass of one or more polymers selected from the group consisting of 60 to 90 parts by mass of copolymer, (B) polyolefin, polydiolefin, and ethylene copolymer (excluding ethylene / propylene copolymer) 0 to 40 parts by mass of one or more selected from the group consisting of (C) calcium carbonate, clay, talc and metal hydroxide with respect to parts [however (A) + (B) = 100 parts by mass] polyolefin composition der formed by is, the resistance The pressure reinforcing layer is formed by winding a resin band, and a linear pressing member for pressing the band is wound between the internal pressure resistant layer and the axial force reinforcing layer without a gap. A flexible pipe for transporting fluid, wherein an attached belt-like body pressing layer is formed . As the tube body, an interlock tube is usually used.

  The component (B) may be butadiene rubber, or the component (B) may be an ethylene / vinyl acetate copolymer. The protective layer is made of a resin and may be made of the polyolefin-based composition described above.

  According to the present invention, since it can withstand low temperatures, liquefied carbon dioxide can be used at about atmospheric pressure. Also in this case, the bending resistance can be ensured. Further, since the internal pressure-proof reinforcing layer is formed by winding a belt-like body, it is easy to manufacture and is lightweight. Furthermore, since the belt-like body pressing layer is formed, it is possible to prevent the belt-like body from shifting.

  According to the present invention, it is possible to provide a flexible tube for fluid transportation that can withstand use at low temperatures and has excellent bending resistance.

FIG. 2 is a cross-sectional perspective view showing the flexible tube 1. FIG. 3 is an axial cross-sectional view showing the flexible tube 1. 1 is a longitudinal sectional view showing a flexible tube 1. (A) is a figure which shows the pressing member 16a, (b) is a figure which shows the pressing member 16b. The figure which shows the carbon dioxide storage system 20a. The figure which shows the carbon dioxide storage system 20b. The figure which shows the carbon dioxide storage system 20c.

  Hereinafter, the flexible tube 1 concerning embodiment of this invention is demonstrated. 1 to 3 are views showing the flexible tube 1, FIG. 1 is a perspective sectional view of the flexible tube 1, FIG. 2 is a circumferential sectional view, and FIG. 3 is an axial sectional view. The flexible tube 1 mainly includes an interlock tube 3, which is a tubular body, a resin layer 5, an internal pressure-resistant reinforcing layer 7, a belt-like body pressing layer 9, an axial force reinforcing layer 11, a protective layer 13, and the like.

  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. In addition, it is possible to use a tubular body of another aspect as long as it is a tubular body having the same flexibility and excellent in buckling strength or the like instead of the interlock tube 3.

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

  The provision of the resin layer 5 on the outer peripheral portion of the interlock pipe 3 does not necessarily require that the interlock pipe 3 and the resin layer 5 are in contact with each other. Even if the layers are provided between them, the resin layer 5 is referred to as being provided “on the outer peripheral portion” of the interlock pipe 3. In the following description, the term “peripheral portion” (or simply “periphery”) is similarly used. Further, in the drawings after FIG. 2, illustration of the floor layer is omitted.

  The resin layer 5 is made of a polyolefin-based composition. (A) 60 to 90 parts by mass of an ethylene / propylene copolymer, (B) a polyolefin, a polydiolefin, and an ethylene copolymer (excluding an ethylene / propylene copolymer). 10 to 40 parts by mass of one or more polymers selected from the group consisting of (C) calcium carbonate, clay, talc, metal hydroxide with respect to (A) + (B) = 100 parts by mass) 0-40 mass parts of one or more selected from the group which consists of a thing are contained.

  Examples of the ethylene / propylene copolymer include EPM, which is a copolymer of ethylene and propylene, and EPDM, which is a terpolymer of ethylene, propylene and a nonconjugated diene. Examples of the nonconjugated diene include 1,4- Examples include hexadiene, ethylidene norbornene, vinyl norbornene, and dicyclopentadiene.

  Examples of the polyolefin include thermoplastic resins such as polyethylene and polypropylene. Examples of the polydiolefin include synthetic rubber such as butadiene rubber and isoprene rubber, and natural rubber. Examples of ethylene copolymers other than ethylene / propylene copolymers include ethylene / vinyl acetate copolymers, ethylene / acrylic acid ester copolymers, ethylene / methacrylic acid ester copolymers, ethylene / acrylic acid copolymers, ethylene -A thermoplastic resin such as a methacrylic acid copolymer or an ethylene / butylene copolymer, a thermoplastic elastomer, or an ionomer. Further, polyolefins, polydiolefins, and ethylene copolymers other than ethylene / propylene copolymers that do not contain halogens modified with unsaturated carboxylic acids and / or derivatives thereof can also be used. These halogen-free polyolefins, polydiolefins, ethylene copolymers other than ethylene-propylene copolymers, halogens modified with unsaturated carboxylic acids and / or derivatives thereof, polyolefins, polydiolefins, ethylene The ethylene copolymer other than the propylene copolymer may be used alone or in combination of two or more.

  The presence of the component (B) together with the component (A) ensures the flex resistance while maintaining the low embrittlement temperature without impairing the basic characteristics of the resin layer compared to the component (A) alone. can do. The component (B) is 10 to 40 parts by mass ((A) + (B) = 100 parts by mass), preferably 70 to 80 parts by mass of the component (A) with respect to 60 to 90 parts by mass of the component (A). B) It is 20-30 mass parts of components. When there are too many (B) components, a low temperature resistance characteristic may be impaired, or an elongation residual rate may fall, and the flexibility of (A) component may be impaired. (C) is added as needed for the purpose of improving workability, but if it is contained in excess of 40 parts by mass with respect to (A) + (B) = 100 parts by mass, the embrittlement temperature becomes high. Impairs the low temperature characteristics. If the workability is not taken into consideration, even if (C) is 0, the effect of the present invention can be obtained.

  The polyolefin-based composition of the present invention includes various commonly used resins and rubbers, and further additives (flame retardants, antioxidants, metal deactivators, ultraviolet absorbers, dispersants, crosslinking aids, A crosslinking agent, a reinforcing agent such as carbon or silica, a pigment, and the like) can be appropriately blended as necessary within the range not impairing the object of the present invention.

Furthermore, the composition in the present invention needs to be crosslinked after extrusion coating as the resin layer 5, and the polyolefin composition preferably contains a crosslinking agent.
As the crosslinking agent, an organic peroxide is preferable, and examples thereof include dicumyl peroxide, 2,5-dimethyl-2,5-di (t-butyl peroxide) hexyne, and 1,3-bis- (t-butyl peroxide). Oxyisopropyl) benzene, 1,1, -di-t-butylperoxy-cyclohexane and the like. The blending amount is suitably 2 to 5 parts by mass with respect to 100 parts by mass of the base resin.
For the crosslinking treatment after extrusion coating, a steam crosslinking method, a molten salt crosslinking method, an electron beam irradiation crosslinking method, or a chemical crosslinking method can be used, but it is not particularly limited.

  In general, the resin layer 5 is crosslinked by extruding the polyolefin composition of the present invention outside the interlock tube 3 and then heating at 160 to 200 ° C. for crosslinking.

  On the outer periphery of the resin layer 5, an internal pressure-proof reinforcing layer 7 is provided. The internal pressure reinforcement layer 7 is a reinforcement layer against an internal pressure or the like when the fluid flowing mainly in the interlock pipe 3 is pumped. The flexible tube 1 according to the present invention is used for transporting liquefied carbon dioxide or the like having a pressure of about atmospheric pressure, and therefore there is no need to use a conventional steel concave member.

  The internal pressure proof reinforcing layer 7 is formed by winding a reinforcing belt-like body. As the reinforcing band-like body, plastic fibers can be applied, and for example, a tape of polyarylate fibers can be used. For example, the polyarylate fiber tape is wound at a short pitch so as to wrap ends in the tape width direction. Note that a plurality of reinforcing strips may be wound around each other.

  A belt-like body pressing layer 9 is provided on the outer periphery of the internal pressure-proof reinforcing layer 7. The band-shaped body pressing layer 9 is a layer for pressing the band-shaped body that constitutes the internal pressure-resistant reinforcing layer 7 wound as a reinforcing band. The belt-like body pressing layer 9 is wound with a linear pressing member. The belt-like body pressing layer 9 can be deformed following the flexibility of the interlock tube 3. Details of the pressing member will be described later.

  An axial force reinforcing layer 11 is provided on the outer periphery of the belt-like body pressing 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 reinforcing strips having a flat cross-sectional shape at a long pitch (so that the winding pitch is sufficiently long with respect to the width of the reinforcing strip). A plurality of reinforcing strips are arranged in the circumferential direction on the outer periphery of the internal pressure-proof reinforcing layer, and are wound at a long pitch. The axial force reinforcing layer 11 can be deformed following the flexibility of the interlock tube 3.

  If necessary, a floor layer 15b, which is a resin tape made of polyethylene or the like, may be provided between the belt-like body pressing layer 9 and the axial force reinforcing layer 11, and is wound spirally in the opposite direction. A floor layer 15c may be provided between the two layers of reinforcing strips. The floor layers 15b and 15c are for preventing the reinforcing members from rubbing and wearing 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 portion of the belt-like body pressing layer 9 regardless of the presence or absence of the floor layer.

  A protective layer 13 is provided on the outer peripheral portion of the axial force reinforcing layer 11. The protective layer 13 is a layer for preventing seawater or the like from entering the reinforcing layer, for example. The protective layer 13 can be made of, for example, polyethylene, polyamide synthetic resin, or the like, but it is desirable to use the same polyolefin-based resin as the resin layer 5 described above. In this case, it is not necessary to have the same component as the resin layer 5 as long as it has the above-described composition.

  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. As described above, each layer constituting the flexible tube 1 follows the bending deformation of the flexible tube 1 and has flexibility.

  Next, the pressing member will be described. FIG. 4A is a perspective view of the vicinity of the end of the pressing member 16a. The pressing member 16a is a solid linear body, and for example, metal such as stainless steel or aluminum alloy, fiber reinforced plastic, or the like can be used. As the pressing member, a member having an outer diameter of about 10 mmφ can be used in consideration of strength, specific gravity, flexibility, and the like.

  Moreover, as shown in FIG.4 (b), the hollow pressing member 16b can also be used. In the present invention, both the solid body as shown in FIG. 4A and the hollow body as shown in FIG. 4B are called linear bodies.

  As shown in FIG. 3, the belt-like body pressing layer 9 is tightly wound so that the pressing members 16a (16b) are in contact with each other (that is, the winding pitch is substantially equal to the outer diameter of the pressing member). Note that, in the longitudinal direction of the flexible tube 1, the type of the pressing member 16 a constituting the belt-shaped body pressing layer 9 may be changed. For example, a solid pressing member 16a may be partially used, and a hollow pressing member 16b may be used for other portions. Further, the material of the pressing member may be changed with respect to the longitudinal direction of the flexible tube 1.

  By changing the type of the pressing member, the flexible tube 1 can change the specific gravity (weight in water) with respect to the longitudinal direction. For example, a pressing member which is a resin hollow body having a low specific gravity is used near the end of the flexible tube 1, and a solid pressing member made of metal having a large specific gravity is used near the central portion of the flexible tube 1. Is used, the underwater weight in the vicinity of the end of the flexible tube 1 is light (or can float), and the underwater weight in the vicinity of the central portion of the flexible tube 1 can be increased.

  Table 1 shows the result of calculation regarding the weight in water of the flexible tube when various pressing members are changed. In Table 1, FRP is a fiber reinforced plastic, SUS is stainless steel, and aluminum is a corrosion-resistant aluminum alloy. The air weight is the weight in the air, and the weight in water is the weight in seawater. A negative weight in water indicates floating in seawater. In Table 1, No. 1 is a reference value when there is no pressing member. No. 1-No. 6 has the same structure except for the belt-like body pressing layer. In addition, the material of the strip-shaped body pressing layer indicates the material of the pressing member that constitutes the strip-shaped pressing body.

  As shown in Table 1, the weight in water can be changed by changing the material and shape (solid or hollow body) of the pressing member. At this time, since the weight in water can be adjusted only by the pressing member, it is not necessary to change the material and size of other reinforcing layers. For this reason, when adjusting the weight in water, it is possible to easily adjust only the weight in water without requiring complicated strength calculation, corrosion resistance and the like.

  Next, an outline of a method for manufacturing the flexible tube 1 will be described. First, a floor tape is wound around the interlock pipe 3 manufactured in advance as necessary to form a floor layer 15a (FIG. 1). A resin layer 5 is formed by extruding and coating the outer peripheral portion of the interlock pipe 3 on which the floor layer 15a is formed with an extruder. The resin layer 5 is subjected to a crosslinking treatment as described above.

  In the interlock pipe 3 on which the resin layer 5 is formed, a belt-like body that is a reinforcing band is wound at a short pitch by a reinforcing tape winding machine or the like, and the internal pressure-proof reinforcing layer 7 is formed. A pressing member is wound around the outer periphery of the internal pressure-proof reinforcing layer 7 to form a band-shaped pressing layer 9.

  A flooring tape or the like is wound around the outer periphery of the belt-like body pressing layer 9 as necessary, and a reinforcing strip is wound around the outer periphery at a long pitch. The reinforcing strips are spirally wound from a state in which a plurality of reinforcing strips are arranged in parallel in the circumferential direction of the winding surface (the belt-like body pressing layer 9 or the floor layer). Further, a protective layer 13 is formed on the outermost peripheral portion by an extruder and wound up to a predetermined length. Thus, the flexible tube 1 is manufactured.

  Next, a carbon dioxide storage system using the flexible tube 1 according to the present invention will be described. The flexible tube 1 according to the present invention is suitable for a carbon dioxide storage system. That is, the flexible tube 1 has a minimum internal pressure resistance characteristic necessary for a carbon dioxide storage system, and is excellent in workability of installing the flexible tube 1 in the sea.

  FIG. 5 is a schematic diagram showing the carbon dioxide storage system 20a. The carbon dioxide storage system 20a mainly includes a flexible tube 1, an offshore base 27, a press-fit tube 29, an injection well 33, and the like. The carbon dioxide storage system transports carbon dioxide generated in a factory or the like to a predetermined sea area by a transport ship 25, and injects liquefied carbon dioxide into an ocean floor from an injection well 33 installed on the ocean floor 19 to store it on the ocean floor. To do.

  Usually, the flexible tube 1 is sunk in the seabed 19 and installed by connecting a float 21 to an end portion to which a joint 23 is attached. At the time of use, the end portion (joint 23) of the flexible tube 1 is pulled up from the float 21 to the ocean by the transport ship 25, and the joint 23 is connected to a tank or the like of the transport ship 25.

  For example, liquefied carbon dioxide is transported below 50 ° C. below zero (temperature above the triple point below 56.6 ° C. below zero). The liquefied carbon dioxide from the transport ship 25 is pumped to the offshore base 27. The offshore base 27 directly or once stores the liquefied carbon dioxide, and then injects the liquefied carbon dioxide into the seabed through the injection pipe 29 through the injection pipe 29. The offshore base 28 is moored to the sea floor by a mooring line 31.

  The flexible tube 1 is submerged in the seabed 19 near the center in the longitudinal direction. A protrusion-like movement suppressing member 17 is provided on the outer periphery of the flexible tube 1 at a contact portion between the flexible tube 1 and the seabed 19. Therefore, the flexible tube 1 is fixed to the seabed and does not move by the ocean current. Further, it is possible to prevent the flexible tube 1 from being bent beyond the allowable radius of curvature or being rubbed against the seabed.

  In addition, since installation of the flexible tube 1 needs to sink the flexible tube 1 in the seabed, a certain amount of underwater weight is required. This is because if the weight in the water is too light, it will take time to sink to the seabed, and it will be affected by ocean currents. On the other hand, the vicinity of the end of the flexible tube 1 needs to be pulled up to the ocean during use. For this reason, if the weight in water is too heavy, a force will be required for winding. Therefore, it is desirable that the flexible tube 1 has a light weight at the end (or may float in water), and the weight near the center of the flexible tube 1 is heavy. At this time, the weight in water (depending on the part) of the flexible tube 1 may be set in consideration of the weight of the joint 23 and the like.

  As the flexible tube used in this way, for example, the inner diameter is about 6 to 10 inches and the outer diameter is 200 to 350 mmφ in consideration of the transport amount and workability such as transportation, feeding and winding of the flexible tube. Can be used. In addition, since adjustment of the underwater weight of a flexible tube can be easily performed with a pressing member, it is not necessary to use a special material for the reinforcing layer or the like.

  Moreover, FIG. 6 is a figure which shows other embodiment, and is a figure which shows the carbon dioxide storage system 20b. The carbon dioxide storage system 20b is different from the carbon dioxide storage system 20a in that the flexible tube 1a according to the present invention is used instead of the press-fit tube 29.

  The flexible tube 1 a connects the offshore base 27 and the injection well 33. The flexible tube 1a is provided with a buoy 35 in the middle as required. That is, the flexible tube 1a floats in the sea. Since the offshore base 27 is moored by the mooring line 31, it is not swept away by the ocean current. Further, since the flexible tube 1a is also connected to the offshore base 27 and the injection well 33, it is not swept away by the ocean current and can be adapted to changes in the tide level.

  In addition, the flexible tube 1a used in this way may set the material and shape of the above-described pressing member appropriately at least in the vicinity of the intermediate portion so that the weight in water becomes substantially zero. By appropriately setting the underwater weight of the flexible tube 1a, it is possible to prevent an excessive force from being applied to the connection portion with the offshore base 27.

  Moreover, it is also applicable to the carbon dioxide storage system 20c shown in FIG. In the carbon dioxide storage system 20c, the flexible tube 1 is directly connected to the injection well 33 on the seabed.

  After connecting the joint 23 to the transport ship 25, liquefied carbon dioxide is directly pumped from the transport ship 25 to the injection well 33 through the flexible tube 1. In this case, it is desirable to provide a structure capable of preventing a backflow or the like from the injection well 33 at the connection portion between the flexible tube 1 and the injection well 33.

  As described above, according to the present embodiment, since the low temperature embrittlement temperature is low and the embrittlement temperature is below 65 ° C. below zero, it can be used without being embrittled even at a low temperature below the use temperature of liquefied carbon dioxide gas. Therefore, it is not necessary to hold liquefied carbon dioxide at a high pressure, and transportation or the like can be performed with a simple structure. Moreover, it is excellent in bending resistance even when used at such a low temperature.

  Moreover, since the internal pressure-proof reinforcing layer is formed by winding the reinforcing band-like body, it is lightweight and easy to manufacture. In addition, since the belt-like body pressing layer is formed on the outer periphery of the reinforcing belt-like body, the reinforcing tape or the like is securely pressed without being displaced due to repeated bending of the flexible tube. At this time, it is possible to follow the flexibility of the flexible tube. Since it has flexibility, it is excellent in installation workability and the like.

  Further, since the pressing members are tightly wound, the pressing members are not displaced and are only wound in a coil shape, so that the manufacturing is easy.

  Moreover, the weight in water of a flexible tube can be easily adjusted by setting the material and shape of a pressing member suitably. Therefore, the flexible tube can be easily designed. It is also easy to change the weight in water depending on the position of the flexible tube 1 in the longitudinal direction. Therefore, the underwater weight can be set for each portion according to the usage mode of the flexible tube 1.

  EXAMPLES Hereinafter, although this invention is demonstrated further in detail based on an Example, this invention is not limited to these.

"Production of sheet"
Each component shown in Table 2 was prepared by kneading for about 10 to 20 minutes using a 1.7 L Banbury at 100 to 180 ° C and an 8-inch roll at 50 to 80 ° C. The obtained polyolefin-based composition was molded into a sheet and then subjected to a cross-linking treatment by pressing at 160 ° C. for 30 minutes to prepare test sheets for the following various tests.
In Table 2, EPDM represents an ethylene / propylene / diene copolymer, BR represents a butadiene rubber, EVA represents an ethylene / vinyl acetate copolymer, and LDPE represents a low density polyethylene.

1) Embrittlement temperature Using a test sheet having a thickness of 2 mm, the impact embrittlement limit temperature was measured in accordance with JIS K 6261 (vulcanized rubber and thermoplastic rubber—how to obtain low temperature characteristics). Impact embrittlement limit temperature (embrittlement temperature) A temperature not higher than the triple point temperature of carbon dioxide was regarded as acceptable (◯, x is unacceptable).

2) Thermal aging characteristics (residual elongation)
Using a test sheet having a thickness of 2 mm, a sample was heated at 100 ° C. for 96 hours in accordance with A-2 method of JIS K 6257 (vulcanized rubber and thermoplastic rubber—how to obtain heat aging characteristics), The residual rate was calculated. 80% or more was determined to be acceptable (“◯” and “x” is unacceptable).

  As shown in Table 2, since the resin compositions of Examples 1 to 7 of the present invention are excellent in elongation residual rate, and the embrittlement temperature is −65 ° C. or lower and excellent in low-temperature resistance, from around −50 ° C. , Can be used at a temperature near the triple point of CO2, and since the material contains the component (A), it is flexible and excellent in bending resistance.

  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 ......... Flexible tube 3 ......... Interlock tube 5 ......... Resin layer 7 ......... Internal pressure-resistant reinforcement layer 9 ...... Strip-like body pressing layer 11 ...... Axial force reinforcement layer 13 ......... Protective layer 15 a, 15 b, 15 c, 15 d ............ the floor layer 16 a, 16 b ............ the holding member 17 ............ the movement restraining member 19 ...... the seabed 20 a, 20 b, 20 c ...... the carbon dioxide storage system 21 ...... the float 23 ... …… Joint 25 ……… Transport ship 27 ……… Offshore base 29 ………… Press-fit pipe 31 ………… Mooring line 33 ……… Injection well 35 ……… Buoy

Claims (4)

A flexible tube;
A resin layer provided on the outer periphery of the tube;
An internal pressure-proof reinforcing layer provided on the outer periphery of the resin layer;
An axial force reinforcing layer provided on an outer peripheral portion of the internal pressure resistant reinforcing layer;
A protective layer provided on the outer periphery of the axial force reinforcing layer;
Comprising
The resin layer is selected from the group consisting of (A) 60 to 90 parts by mass of an ethylene / propylene copolymer, (B) a polyolefin, a polydiolefin, and an ethylene copolymer (excluding an ethylene / propylene copolymer). One or more polymers are selected from the group consisting of (C) calcium carbonate, clay, talc, and metal hydroxide with respect to 10 to 40 parts by mass (where (A) + (B) = 100 parts by mass). polyolefin compositions der that one or more comprising 0 to 40 parts by weight that is,
The internal pressure proof reinforcing layer is formed by winding a resin band, and a linear pressing member for pressing the band is provided between the internal pressure proof layer and the axial force reinforcing layer. A flexible tube for transporting fluid, characterized in that a belt-like body pressing layer wound around is formed .   The flexible tube for fluid transportation according to claim 1, wherein the component (B) is butadiene rubber.   The flexible tube for fluid transportation according to claim 1, wherein the component (B) is an ethylene / vinyl acetate copolymer.   The flexible tube for fluid transportation according to any one of claims 1 to 3, wherein the protective layer is made of resin and is the polyolefin-based composition according to claim 1.

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