JPH05180375A - Flexible fluid transport tube - Google Patents
Flexible fluid transport tubeInfo
- Publication number
- JPH05180375A JPH05180375A JP3357710A JP35771091A JPH05180375A JP H05180375 A JPH05180375 A JP H05180375A JP 3357710 A JP3357710 A JP 3357710A JP 35771091 A JP35771091 A JP 35771091A JP H05180375 A JPH05180375 A JP H05180375A
- Authority
- JP
- Japan
- Prior art keywords
- specific gravity
- low specific
- layer
- length
- pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、たとえば、石油、化学
薬品等の流体を輸送するために用いられる可撓性流体輸
送管に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible fluid transport pipe used for transporting fluids such as petroleum and chemicals.
【０００２】[0002]
【従来の技術】可撓性流体輸送管は通常、以下のように
構成されている。まず、外圧強度または側圧強度を得る
ために断面形状Ｓ状のステンレステープを螺旋状に噛み
合わせてなるインターロック管の周囲に内部流体の漏洩
を防止するためのプラスチックを被覆した内管の周囲
に、輸送流体の圧力により生ずるフープストレスから内
管を補強する周方向補強層が配置されている。この周方
向補強層は、たとえば、金属条または金属テープや高強
度繊維を短ピッチで螺旋巻して構成されている。周方向
補強層の外側には、内圧力や張力に対する軸方向補強層
が配置されている。軸方向補強層は、金属条や繊維強化
プラスチック条を長ピッチで螺旋巻して構成されてい
る。さらにこの軸方向補強層の周囲には、たとえば、プ
ラスチックからなる保護シース層が設けられている。2. Description of the Related Art A flexible fluid transportation pipe is usually constructed as follows. First, in order to obtain the external pressure strength or the lateral pressure strength, the stainless steel tape having the cross-sectional shape of S is spirally meshed around the interlock pipe, and the inner pipe covered with the plastic for preventing the leakage of the internal fluid is surrounded. A circumferential reinforcing layer is arranged to reinforce the inner pipe from the hoop stress generated by the pressure of the transport fluid. The circumferential reinforcing layer is formed, for example, by spirally winding a metal strip or metal tape or high-strength fiber at a short pitch. An axial reinforcing layer for the internal pressure and tension is arranged outside the circumferential reinforcing layer. The axial reinforcing layer is formed by spirally winding a metal strip or a fiber-reinforced plastic strip at a long pitch. Furthermore, a protective sheath layer made of, for example, plastic is provided around the axial reinforcing layer.
【０００３】このような可撓性流体輸送管が、大水深海
域において懸垂状態で使われる場合、可撓性流体輸送管
は長大になるため、可撓性流体輸送管の自重に起因して
大きな張力が発生し使用が困難になる。またこのような
流体輸送管において、高粘度の流体を輸送する場合、輸
送流体温度の低下を少なくし流体粘度の上昇を最小限度
におさえる必要がある。When such a flexible fluid transport pipe is used in a suspended state in a deep water area, the flexible fluid transport pipe becomes long and large due to its own weight. Tension is generated and it becomes difficult to use. Further, in the case of transporting a highly viscous fluid in such a fluid transport pipe, it is necessary to reduce the temperature drop of the transported fluid and minimize the increase of the fluid viscosity.
【０００４】従来、このような問題を解決することを目
的として、可撓性流体輸送管の浮力を増大しまた断熱性
を改善するために、たとえば、発泡プラスチック層、シ
ンタクチックフォーム層やプラスチックチューブからな
る断熱性を有する比重が１以下の低比重層を軸方向補強
層の外側や保護シース層の外側に設けている。Conventionally, for the purpose of solving such a problem, in order to increase the buoyancy of a flexible fluid transportation pipe and improve the heat insulating property, for example, a foamed plastic layer, a syntactic foam layer or a plastic tube. A low specific gravity layer having a heat insulating property and having a specific gravity of 1 or less is provided outside the axial reinforcing layer or outside the protective sheath layer.
【０００５】[0005]
【発明が解決しようとする課題】たとえば、可撓性流体
輸送管を海中に布設する場合、自重で海中に落下するこ
とを防ぐために、布設船上で無限軌道式引取機等により
可撓性流体輸送管を挟み込むことによりブレーキをかけ
ながら海中に落としこんでいくことが行われている。発
泡プラスチックのテープやプラスチックのチューブを低
比重層にもちいた可撓性流体輸送管は、低比重層の側圧
強度が弱いために、このような布設時に無限軌道式引取
機等による圧縮により、低比重層が潰されたり、また低
比重層の外圧強度が低いために海中で水圧により低比重
層が潰され、海中で所望の機能が損なわれるという問題
点がある。For example, in the case of laying a flexible fluid transport pipe in the sea, in order to prevent the flexible fluid transport pipe from falling into the sea by its own weight, the flexible fluid transport pipe is installed on a laying ship by an endless track type take-off machine or the like. It is practiced to put the pipe in and put it into the sea while braking. Flexible fluid transportation pipes that use foamed plastic tape or plastic tubes for the low specific gravity layer have low lateral pressure strength in the low specific gravity layer. There is a problem that the specific gravity layer is crushed, and the low specific gravity layer has a low external pressure strength, so that the low specific gravity layer is crushed by water pressure in the sea and the desired function is impaired in the sea.
【０００６】また可撓性流体輸送管にシンタクチックフ
ォームのように堅い低比重層を設ける場合、上記の側圧
・外圧による問題は回避可能であるが、シンタクチック
フォームに可撓性がないため全長にわたり連続的に低比
重層を設けることができない。そこで可撓性を付与する
ために、長手方向に間隔をあけて部分的に低比重層を設
けることが行われる。しかし可撓性流体輸送管に低比重
層がない部分が生じ、断熱性・浮力が充分に得られない
という問題点や低比重層間のすきまがあることにより管
長手方向に潮流等による流体力の影響を受け易くなり、
可撓性流体輸送管に過大な張力を与えやすくなるといっ
た問題点がある。When a flexible low specific gravity layer such as syntactic foam is provided on the flexible fluid transport pipe, the problems due to the above-mentioned lateral pressure and external pressure can be avoided, but since the syntactic foam is not flexible, the full length is reduced. It is impossible to continuously provide the low specific gravity layer. Therefore, in order to impart flexibility, a low specific gravity layer is partially provided at intervals in the longitudinal direction. However, the flexible fluid transport pipe has a part without a low specific gravity layer, and there is a problem that sufficient heat insulation and buoyancy cannot be obtained, and there is a gap between the low specific gravity layers. More easily affected,
There is a problem that it becomes easy to apply excessive tension to the flexible fluid transport pipe.
【０００７】本発明はかかる点に、鑑みてなされたもの
であり、充分な断熱効果や浮力があり、低比重層が潰さ
れることのない、可撓性流体輸送管を提供するものであ
る。The present invention has been made in view of the above points, and provides a flexible fluid transport pipe which has a sufficient heat insulating effect and buoyancy and in which a low specific gravity layer is not crushed.
【０００８】[0008]
【課題を解決するための手段】本発明は、内部に流体が
流通するプラスチック内管と、該内管の周囲に配置され
該内管の周方向に加わる応力から該内管を補強する周方
向補強層と、該周方向補強層の周囲に配置され前記内管
の軸方向に加わる張力から前記内管を補強する軸方向補
強層と、該軸方向補強層の周囲に配置された低比重層
と、該低比重層の周囲に被覆した保護シース層とを具備
する可撓性流体輸送管において、前記低比重層が硬質低
比重体と軟質低比重体により構成され、管長手方向に該
硬質低比重体と該軟質低比重体が交互に配列され、該軟
質低比重体の管長手方向長さＬと該低比重層厚さｔの間
にはＬ≧０．５ｔの関係を有し、かつ該硬質低比重体の
管長手方向長さＨと該軟質低比重体の管長手方向長さＬ
の間にはＨ≧０．６Ｌの関係を有することを特徴とする
可撓性流体輸送管である。DISCLOSURE OF THE INVENTION The present invention is directed to a plastic inner tube in which a fluid flows, and a circumferential direction which is arranged around the inner tube and reinforces the inner tube from the stress applied in the circumferential direction of the inner tube. A reinforcing layer, an axial reinforcing layer which is arranged around the circumferential reinforcing layer and reinforces the inner tube from a tension applied in the axial direction of the inner tube, and a low specific gravity layer which is arranged around the axial reinforcing layer. And a protective sheath layer coated around the low specific gravity layer, wherein the low specific gravity layer is composed of a hard low specific gravity body and a soft low specific gravity body, and The low specific gravity bodies and the soft low specific gravity bodies are alternately arranged, and there is a relationship of L ≧ 0.5t between the length L of the soft low specific gravity body in the pipe longitudinal direction and the low specific gravity layer thickness t, And the length H of the hard low specific gravity body in the longitudinal direction of the pipe and the length L of the soft low specific gravity body in the longitudinal direction of the pipe.
Is a flexible fluid transport tube characterized by having a relationship of H ≧ 0.6L between the two.
【０００９】[0009]
【作用】本発明の可撓性流体輸送管は、低比重層が軟質
低比重体と硬質低比重体が管長手方向に交互に配置さ
れ、該軟質低比重体の管長手方向長さＬと該軟質低比重
体厚さｔの間にはＬ≧０．５ｔの関係を有しかつ該硬質
低比重体の管長手方向長さＨと該軟質低比重体の管長手
方向長さＬの間にはＨ≧０．６Ｌの関係を有している。
これにより、側圧・外圧には硬質低比重体により保持さ
れ、可撓性は軟質低比重体により機能され、また該低比
重層は保護シースにより被われるので可撓性流体輸送管
の表面は平滑であり、無用の流体力をうけることを防止
することができる。In the flexible fluid transport pipe of the present invention, the low specific gravity layers are formed by alternately arranging the soft low specific gravity bodies and the hard low specific gravity bodies in the longitudinal direction of the pipe, and the length L of the soft low specific gravity body in the longitudinal direction of the pipe. The thickness t of the soft low specific gravity has a relationship of L ≧ 0.5t, and is between the length H of the rigid low specific gravity in the pipe longitudinal direction and the length L of the soft low specific gravity in the pipe longitudinal direction. Has a relationship of H ≧ 0.6L.
As a result, the lateral and external pressures are held by the hard low specific gravity body, the flexibility is functioned by the soft low specific gravity body, and the low specific gravity layer is covered by the protective sheath, so the surface of the flexible fluid transport pipe is smooth. Therefore, it is possible to prevent receiving unnecessary fluid force.
【００１０】[0010]
【実施例】以下、本発明の実施例を図１（ａ）、（ｂ）
を参照して説明する。図中、１は断面形状Ｓ条で噛み合
わせた金属製のインターロック管である。インターロッ
ク管１の周囲には、可撓性を有するプラスチックパイプ
から成るプラスチック内管２が配置されている。プラス
チックパイプの材質は通常ポリエチレンやポリアミド樹
脂が使われる。EXAMPLES Examples of the present invention will be described below with reference to FIGS. 1 (a) and 1 (b).
Will be described. In the figure, reference numeral 1 denotes a metal interlock tube which is meshed with a S-shaped cross section. A plastic inner pipe 2 made of a flexible plastic pipe is arranged around the interlock pipe 1. The material of the plastic pipe is usually polyethylene or polyamide resin.
【００１１】プラスチック内管２の周囲にはその内管２
の周方向に発生するフープ応力から内管２を補強する周
方向補強層３が配置されている。周方向補強層３は、断
面形状Ｃ字状の金属条をその凸部が互いにかみ合うよう
にして２層、短ピッチで螺旋巻したものである。Around the plastic inner pipe 2, the inner pipe 2
A circumferential reinforcing layer 3 is arranged to reinforce the inner pipe 2 from the hoop stress generated in the circumferential direction. The circumferential reinforcing layer 3 is formed by spirally winding two layers of a metal strip having a C-shaped cross section with a short pitch so that the convex portions thereof are engaged with each other.
【００１２】周方向補強層３の上層にはプラスチック内
管２の軸方向に加わる外力からその内管２を補強する軸
方向補強層４が配置されている。軸方向補強層４は、断
面が矩形または円形の金属や繊維強化プラスチック等か
らなる線状体４ａ、４ｂを長ピッチでかつ望ましくは線
状体４ａ、４ｂの巻き方向を変えて周方向補強層３の周
囲に２層螺旋巻きしたものである。On the upper layer of the circumferential reinforcing layer 3, there is arranged an axial reinforcing layer 4 which reinforces the inner tube 2 from an external force applied in the axial direction of the plastic inner tube 2. The axial reinforcing layer 4 is a circumferential reinforcing layer in which the linear bodies 4a and 4b made of metal or fiber reinforced plastic having a rectangular or circular cross section are arranged at a long pitch and preferably by changing the winding direction of the linear bodies 4a and 4b. It is a three-layer spiral wound around 3.
【００１３】軸方向補強層４の周囲には、浮力や断熱性
を付与するために比重が１以下の低比重層５が配置され
ている。低比重層５は硬質低比重体５ａおよび軟質低比
重体５ｂより構成されており、硬質低比重体５ａおよび
軟質低比重体５ｂは長手方向に交互に配列されている。
また、硬質低比重体５ａは例えば、中空のガラス玉やプ
ラスチック玉をエポキシ樹脂等に分散させたシンタクチ
ックフォーム、木材、独立気泡の発泡金属等からなる成
形品で形成される。さらに、軟質低比重体５ｂは、例え
ば、ポリエチレン、ポリプロピレン、塩化ビニル、ウレ
タンの発泡体のような発泡プラスチックで押出被覆また
テープ巻等により形成される。またさらに適度な可撓性
を付与するために軟質低比重体５ｂの管長手方向長さＬ
と軟質低比重体の厚さｔとの間にはＬ≧０．５ｔの関係
を有し、充分な耐外圧性・耐側圧性を付与するために硬
質低比重体５ａの管長手方向長さＨと軟質低比重体５ｂ
の管長手方向長さＬとの間にはＨ≧０．６Ｌの関係を有
している。A low specific gravity layer 5 having a specific gravity of 1 or less is arranged around the axial reinforcing layer 4 in order to impart buoyancy and heat insulation. The low specific gravity layer 5 is composed of a hard low specific gravity body 5a and a soft low specific gravity body 5b, and the hard low specific gravity body 5a and the soft low specific gravity body 5b are alternately arranged in the longitudinal direction.
The hard low specific gravity body 5a is formed of, for example, a molded product made of syntactic foam in which hollow glass balls or plastic balls are dispersed in an epoxy resin, wood, foamed metal with closed cells, or the like. Furthermore, the soft low specific gravity body 5b is formed by extrusion coating or tape winding with a foamed plastic such as a foamed body of polyethylene, polypropylene, vinyl chloride or urethane. In addition, in order to impart more appropriate flexibility, the length L of the soft low specific gravity body 5b in the pipe longitudinal direction is
And the thickness t of the soft low specific gravity body have a relationship of L ≧ 0.5t, and the length of the hard low specific gravity body 5a in the longitudinal direction of the pipe is sufficient to impart sufficient external pressure resistance and lateral pressure resistance. H and soft low specific gravity 5b
Has a relationship of H ≧ 0.6L with the length L of the tube in the longitudinal direction.
【００１４】低比重層５の周囲には、保護シース層６が
被覆されている。保護シース６は通常ポリエチレンやポ
リアミド樹脂が使われる。また、外傷防止のためにさら
に保護シース６の外側には金属テープ巻きや金属テープ
を断面形状Ｓ状で噛み合わせ周回巻きした保護層（図示
せず）が設けられることがある。A protective sheath layer 6 is coated around the low specific gravity layer 5. The protective sheath 6 is usually made of polyethylene or polyamide resin. Further, in order to prevent external damage, a protective layer (not shown) may be provided on the outer side of the protective sheath 6 by winding a metal tape or winding the metal tape in an S-shaped cross-section.
【００１５】本発明の可撓性流体輸送管は上記のよう
に、低比重層５は硬質低比重体５ａと軟質低比重体５ｂ
が管長手方向に交互に配列され、軟質低比重体５ｂの管
長手方向長さＬと軟質低比重体の厚さｔとの間にはＬ≧
０．５ｔの関係を有し、硬質低比重体５ａの管長手方向
長さＨと軟質低比重体５ｂの管長手方向長さＬとの間に
はＨ≧０．６Ｌの関係を有している。As described above, in the flexible fluid transport pipe of the present invention, the low specific gravity layer 5 includes the hard low specific gravity body 5a and the soft low specific gravity body 5b.
Are alternately arranged in the pipe longitudinal direction, and L ≧ L is provided between the length L of the soft low specific gravity body 5b in the pipe longitudinal direction and the thickness t of the soft low specific gravity body.
There is a relationship of 0.5t, and there is a relationship of H ≧ 0.6L between the pipe longitudinal direction length H of the hard low specific gravity body 5a and the pipe longitudinal direction length L of the soft low specific gravity body 5b. There is.
【００１６】このような低比重層５の構成により、流体
輸送管の可撓性と耐外圧・耐側圧性を両立することがで
きる。すなわち、外圧・側圧による変形が押さえられる
ので、浮力低下が最低限に押さえられ、可撓性流体輸送
管上端部に過大な張力が加わることがなく、また充分な
可撓性を有しているので、波浪や潮流により外力を受け
たときに容易に曲がり、浮体等の移動に追従することが
でき、大水深海域で使用することが可能である。さらに
高粘度流体を輸送する場合、布設時や外水圧による変形
を押さえることができるため、海底で断熱性を低下する
ことなく高温で流体を粘度低下を最小限に押さえて輸送
することが可能となる。With the structure of the low specific gravity layer 5 as described above, it is possible to achieve both flexibility and resistance to external pressure and lateral pressure of the fluid transport pipe. That is, since the deformation due to the external pressure and the lateral pressure is suppressed, the decrease in the buoyancy is suppressed to the minimum, the excessive tension is not applied to the upper end portion of the flexible fluid transport pipe, and the flexible fluid transport pipe has sufficient flexibility. Therefore, when it receives an external force due to waves or tidal current, it can easily bend and follow the movement of the floating body, etc., and can be used in the deep water area. Furthermore, when transporting a high-viscosity fluid, it is possible to suppress deformation during installation and due to external water pressure, so it is possible to transport the fluid at a high temperature with minimal viscosity reduction without lowering the heat insulation on the seabed. Become.
【００１７】つぎに、内径１０１ｍｍ、軸方向補強層４
の外径１４２ｍｍ、低比重層５の厚さ１２ｍｍ、軟質低
比重体５ｂは３倍発泡ポリプロピレンフォームからな
り、硬質低比重体５ａは比重０．５のシンタクチックフ
ォームからなる可撓性流体輸送管において低比重層５の
構成を表１に示す種々の値にしたものを作成し、実験を
行った。また比較のために前記可撓性流体輸送管におい
て低比重層が３倍発泡ポリプロピレンフォームを全長に
わたり周回巻きし厚さ１２ｍｍの低比重層を有する従来
構造品も試験に供した。表１に実験に供した試料の諸元
を示す。Next, the inner diameter of 101 mm and the axial reinforcing layer 4
The outer diameter is 142 mm, the thickness of the low specific gravity layer 5 is 12 mm, the soft low specific gravity body 5b is made of triple expanded polypropylene foam, and the hard low specific gravity body 5a is made of syntactic foam having a specific gravity of 0.5. In, the low specific gravity layer 5 having various constitutions shown in Table 1 was prepared and the experiment was conducted. For comparison, a conventional structure having a low specific gravity layer having a thickness of 12 mm, which is obtained by winding a triple expanded polypropylene foam in the flexible fluid transportation pipe, is wound around the entire length of the polypropylene foam. Table 1 shows the specifications of the sample used in the experiment.
【００１８】実験では最小曲げ径と側圧試験を行った。
最小曲げ径は約３ｍ長の該可撓性流体輸送管の両端をワ
イヤにより結び、そのワイヤはロードセル、チェインブ
ロックを介しており、チェインブロックにより曲げ作用
を与え、ロードセルにより曲げ時の荷重を測定される。
該可撓性流体輸送管に曲げを与えたとき該荷重が急激に
上昇し始めた時の曲げ径を最小曲げ径とした。In the experiment, a minimum bending diameter and lateral pressure test were conducted.
The minimum bending diameter is about 3 m, and both ends of the flexible fluid transport pipe are connected by wires. The wires pass through a load cell and a chain block. The chain block gives a bending action, and the load cell measures the load at the time of bending. To be done.
The bending diameter when the load suddenly started to rise when the flexible fluid transport pipe was bent was defined as the minimum bending diameter.
【００１９】また、側圧試験は長さ約５０ｃｍの該可撓
性流体輸送管を鉄板で上下にはさみ、上部よりロードセ
ルを接続した油圧シリンダにより圧縮荷重を加えること
により行った。２５００ｋｇまで荷重をあたえて破壊の
有無を観察した。表２に実験結果を示す。The lateral pressure test was carried out by sandwiching the flexible fluid transport pipe having a length of about 50 cm with an iron plate vertically and applying a compressive load from above with a hydraulic cylinder connected to a load cell. The load was applied up to 2500 kg and the presence or absence of breakage was observed. Table 2 shows the experimental results.
【００２０】[0020]
【表１】 [Table 1]
【００２１】[0021]
【表２】 [Table 2]
【００２２】表２によると、本発明に基づく試料１は最
小曲げ径は従来構造品なみであるが、耐側圧性に優れて
いる。また軟質低比重体の長さを短くした試料２は耐側
圧性は良好であるが最小曲げ径が大きすぎ、実用には適
さない。また、試料３は試料２より軟質低比重体の長さ
を若干長くしたものであり最小曲げ径が実用上の限界で
ある３ｍとなる。According to Table 2, sample 1 according to the present invention has a minimum bending diameter similar to that of the conventional structure, but is excellent in lateral pressure resistance. Further, the sample 2 in which the length of the soft low specific gravity body is shortened has good lateral pressure resistance, but the minimum bending diameter is too large and is not suitable for practical use. Further, in Sample 3, the length of the soft low specific gravity body is slightly longer than in Sample 2, and the minimum bending diameter is 3 m which is the practical limit.
【００２３】一方硬質低比重体の長さを短く、軟質低比
重体の長さを長くした試料４は最小曲げ径は充分である
が、耐側圧性が充分でない。また、硬質比重体の長さを
試料４より若干長くした試料５は塑性変形が少し見られ
たが、２５００ｋｇの耐側圧性があり実用上差支えな
い。On the other hand, Sample 4 in which the length of the hard low specific gravity body is short and the length of the soft low specific gravity body is long is sufficient in the minimum bending diameter, but the lateral pressure resistance is not sufficient. Sample 5 in which the length of the hard specific gravity body is slightly longer than that of Sample 4 showed some plastic deformation, but it has a lateral pressure resistance of 2500 kg, which is practically acceptable.
【００２４】上記の数値を軟質低比重体の長さＬ、軟質
低比重体の厚さｔおよび硬質低比重体の長さＨで示す
と、Ｌはｔの０．４１倍であると可撓性で問題を生じ、
Ｌはｔの０．５倍であると実用上充分な可撓性が得られ
る。またＨはＬの０．５倍であると耐側圧性に問題を生
じ、ＨはＬの０．６倍であると実用に耐え得る耐側圧性
を有することが分かる。したがって、Ｌ＜０．５ｔでな
くかつＨ＜０．６Ｌでない場合、可撓性に優れ、耐側圧
・耐外圧性に優れた低比重層付き可撓性流体輸送管を得
ることができる。When the above numerical values are shown by the length L of the soft low specific gravity body, the thickness t of the soft low specific gravity body and the length H of the hard low specific gravity body, L is flexible when 0.41 times t. Cause problems with sex,
When L is 0.5 times t, sufficient flexibility is obtained in practical use. Further, it can be seen that when H is 0.5 times L, a problem occurs in lateral pressure resistance, and when H is 0.6 times L, the lateral pressure resistance can withstand practical use. Therefore, when L <0.5t and H <0.6L are not satisfied, it is possible to obtain a flexible fluid transport pipe with a low specific gravity layer that is excellent in flexibility and resistance to lateral pressure and external pressure.
【００２５】[0025]
【発明の効果】本発明の可撓性流体輸送管によれば、前
記低比重層が硬質低比重体と軟質低比重体により構成さ
れ、管長手方向に該硬質低比重体と該軟質低比重体が交
互に配列され、該軟質低比重体の管長手方向長さＬと該
軟質低比重体厚さｔの間にはＬ≧０．５ｔの関係を有
し、かつ該硬質低比重体の管長手方向長さＨと該軟質低
比重体の管長手方向長さＬの間にはＨ≧０．６Ｌの関係
を有するため、曲げ作用を受けた場合、軟質低比重体が
その曲げ作用を吸収することにより可撓性を生みだし、
また側圧・外圧を受けた場合、硬質低比重体がその圧縮
力を受け、低比重層の変形を最小限に押さえる事ができ
る。According to the flexible fluid transport pipe of the present invention, the low specific gravity layer is composed of a hard low specific gravity body and a soft low specific gravity body, and the hard low specific gravity body and the soft low specific gravity body are arranged in the longitudinal direction of the pipe. The bodies are alternately arranged, and there is a relationship of L ≧ 0.5t between the length L of the soft low specific gravity body in the pipe longitudinal direction and the thickness t of the soft low specific gravity body, and the hard low specific gravity body has a relationship of L ≧ 0.5t. Since there is a relationship of H ≧ 0.6L between the length H of the pipe in the longitudinal direction and the length L of the soft low specific gravity in the longitudinal direction of the pipe, when the flexible low specific gravity body is subjected to a bending action, Creates flexibility by absorbing,
Further, when lateral pressure or external pressure is applied, the hard low specific gravity body receives the compressive force, and the deformation of the low specific gravity layer can be suppressed to a minimum.
【図１（ａ）】本発明の可撓性流体輸送管の一実施例を
示す上半部切断正面図である。FIG. 1 (a) is an upper half cutaway front view showing an embodiment of a flexible fluid transport pipe of the present invention.
【図１（ｂ）】図１（ａ）に示す流体輸送管の上半部切
断側面図である。1 (b) is a side view of an upper half section of the fluid transport pipe shown in FIG. 1 (a).
【符号の説明】 １ インターロック管 ２ プラスチック内管 ３ 周方向補強層 ４ 軸方向補強層 ５ 低比重層 ５ａ 硬質低比重体 ５ｂ 軟質低比重体 ６ 保護シース[Explanation of Codes] 1 Interlock tube 2 Plastic inner tube 3 Circumferential reinforcing layer 4 Axial reinforcing layer 5 Low specific gravity layer 5a Hard low specific gravity body 5b Soft low specific gravity body 6 Protective sheath
Claims (1)
と、該内管の周囲に配置され該内管の周方向に加わる応
力から該内管を補強する周方向補強層と、該周方向補強
層の周囲に配置され前記内管の軸方向に加わる張力から
前記内管を補強する軸方向補強層と、該軸方向補強層の
周囲に配置された断熱性を有する比重１以下の低比重層
と、該低比重層の周囲に被覆した保護シース層とを具備
する可撓性流体輸送管において、前記低比重層が硬質低
比重体と軟質低比重体により構成され、管長手方向に該
硬質低比重体と該軟質低比重体が交互に配列され、該軟
質低比重体の管長手方向長さＬと該軟質低比重体厚さｔ
の間にはＬ≧０．５ｔの関係を有し、かつ該硬質低比重
体の管長手方向長さＨと該軟質低比重体の管長手方向長
さＬの間にはＨ≧０．６Ｌの関係を有することを特徴と
する可撓性流体輸送管。1. A plastic inner pipe in which a fluid flows, a circumferential reinforcing layer which is arranged around the inner pipe and reinforces the inner pipe from a stress applied in a circumferential direction of the inner pipe, and the circumferential reinforcing member. An axial reinforcing layer which is arranged around the layer and reinforces the inner tube from the tension applied in the axial direction of the inner tube, and a low specific gravity layer having a specific gravity of 1 or less, which is arranged around the axial reinforcing layer and has a heat insulating property. And a protective sheath layer coated around the low specific gravity layer, wherein the low specific gravity layer is composed of a hard low specific gravity body and a soft low specific gravity body, and The low specific gravity bodies and the soft low specific gravity bodies are alternately arranged, and the length L of the soft low specific gravity body in the pipe longitudinal direction and the thickness of the soft low specific gravity body t
Has a relationship of L ≧ 0.5t, and H ≧ 0.6L between the length L of the hard low specific gravity body in the pipe longitudinal direction and the length L of the soft low specific gravity body in the pipe longitudinal direction. A flexible fluid transport pipe having the following relationship.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3357710A JPH05180375A (en) | 1991-12-26 | 1991-12-26 | Flexible fluid transport tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3357710A JPH05180375A (en) | 1991-12-26 | 1991-12-26 | Flexible fluid transport tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05180375A true JPH05180375A (en) | 1993-07-20 |
Family
ID=18455518
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3357710A Pending JPH05180375A (en) | 1991-12-26 | 1991-12-26 | Flexible fluid transport tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05180375A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009085310A (en) * | 2007-09-28 | 2009-04-23 | Furukawa Electric Co Ltd:The | Floating flexible pipe |
| JP2009121618A (en) * | 2007-11-15 | 2009-06-04 | Yokohama Rubber Co Ltd:The | Fluid conveying hose |
| WO2009119297A1 (en) | 2008-03-28 | 2009-10-01 | 古河電気工業株式会社 | Fluid conveying tube and fluid leakage detecting system |
| WO2009119296A1 (en) | 2008-03-28 | 2009-10-01 | 古河電気工業株式会社 | Flexible tube for transporting cryogenic fluid and structure for detecting leakage of fluid in tube |
| JP2009243496A (en) * | 2008-03-28 | 2009-10-22 | Furukawa Electric Co Ltd:The | Cryogenic fluid transportation flexible tube |
| JP2017518182A (en) * | 2014-02-24 | 2017-07-06 | ロッキード マーティン コーポレーション | Friction stir welding pipe |
| WO2019238456A1 (en) * | 2018-06-12 | 2019-12-19 | National Oilwell Varco Denmark I/S | A method for producing a flexible pipe and a flexible pipe |
-
1991
- 1991-12-26 JP JP3357710A patent/JPH05180375A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009085310A (en) * | 2007-09-28 | 2009-04-23 | Furukawa Electric Co Ltd:The | Floating flexible pipe |
| JP2009121618A (en) * | 2007-11-15 | 2009-06-04 | Yokohama Rubber Co Ltd:The | Fluid conveying hose |
| WO2009119297A1 (en) | 2008-03-28 | 2009-10-01 | 古河電気工業株式会社 | Fluid conveying tube and fluid leakage detecting system |
| WO2009119296A1 (en) | 2008-03-28 | 2009-10-01 | 古河電気工業株式会社 | Flexible tube for transporting cryogenic fluid and structure for detecting leakage of fluid in tube |
| JP2009243496A (en) * | 2008-03-28 | 2009-10-22 | Furukawa Electric Co Ltd:The | Cryogenic fluid transportation flexible tube |
| US8479565B2 (en) | 2008-03-28 | 2013-07-09 | Furukawa Electric Co., Ltd. | Fluid conveying tube and fluid leakage detecting system |
| US8789562B2 (en) | 2008-03-28 | 2014-07-29 | Furukawa Electric Co., Ltd | Flexible tube for transporting cryogenic fluid and structure for detecting leakage of fluid in tube |
| JP2017518182A (en) * | 2014-02-24 | 2017-07-06 | ロッキード マーティン コーポレーション | Friction stir welding pipe |
| WO2019238456A1 (en) * | 2018-06-12 | 2019-12-19 | National Oilwell Varco Denmark I/S | A method for producing a flexible pipe and a flexible pipe |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6691743B2 (en) | Flexible pipe with wire or strip winding for maintaining armours | |
| US6612370B1 (en) | Composite hybrid riser | |
| US5062456A (en) | Kink-resistant, small bend radius hose with polyfluorocarbon liner | |
| EP0524206B1 (en) | Composite tubular member with multiple cells | |
| US3332446A (en) | Cryogenic transfer line arrangement | |
| JPH0151717B2 (en) | ||
| US6663453B2 (en) | Buoyancy control systems for tubes | |
| AU778864B2 (en) | Radial partition device, in particular radial buckle arrestor for a double-walled deep water pipeline | |
| US4000759A (en) | Hose | |
| CA2245738A1 (en) | Flexible pipe with internal gasproof undulating metal tube | |
| US6679298B2 (en) | Collapsible flexible pipe | |
| US3613736A (en) | Stranded wire reinforced fluid transporting hose | |
| CN211875334U (en) | Lightweight ultralow temperature resistant flexible composite pipe | |
| AU2004247917A1 (en) | Flexible tubular duct for the transport of fluid and particularly gaseous hydrocarbons with an anti-turbulence carcass and internal lining | |
| JPH05180375A (en) | Flexible fluid transport tube | |
| US7234492B2 (en) | Double-sheath pipe for transporting fluids, provided with a device for limiting propagation of a buckle of the outer tube and method for limiting propagation | |
| AU764330B2 (en) | Heat-insulated duct for transporting fluids | |
| AU775639B2 (en) | Device for limiting propagation of deformation in a wound double-walled tube | |
| JP3228386B2 (en) | Flexible fluid transport pipe | |
| DK1154184T4 (en) | Flexible tubes of sheath of wire or strip to the support of the reinforcement. | |
| JPH06159561A (en) | Flexible fluid transporting pipe | |
| JPH07151273A (en) | Fluid transport pipe | |
| JP2951476B2 (en) | How to draw a long body underwater underwater | |
| EA011529B1 (en) | Rigid composite tubular article and method for its production | |
| JPS61201982A (en) | Marine hose |