JPH06238767A - Manufacture of fluid transport tube - Google Patents

Abstract

PURPOSE:To improve a strength of a fluid transport tube against inner and side pressures to be applied to the tube and to entirely reduce its weight. CONSTITUTION:A transport tube body 12 is manufactured by laterally winding uncured fiber-reinforced resin wire (FRP wire) 20 on an inner plastic tube 18 at a small pitch, forming an outer plastic tube 22 on the laterally wound layer of the wire 20 by extrusion molding, and curing the wire 20 at a temperature of the plastic material at the time of extruding. The tube 18, the wire 20 and the tube 22 are adhered to each other at the time of extruding the outer tube to improve its mechanical strength, and an entirety is reduced in weight due to small specific gravity of the wire 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a fluid transport pipe for transporting a high pressure fluid such as oil collected from a submarine oilfield.

[0002]

2. Description of the Related Art Generally, a fluid transport pipe of this type comprises a plastic pipe, a reinforcing layer provided on the plastic pipe, and a sheath provided on the reinforcing layer.
The reinforcing layer is usually formed by spirally winding a plurality of reinforcing strips having a C-shaped cross section with the openings facing each other at a small pitch and meshing with each other in a circumferential direction (internal pressure). A circumferential reinforcing layer portion for reinforcing the axial direction reinforcing layer portion and an axial direction reinforcing layer portion for helically winding a plurality of reinforcing strips at a large pitch to reinforce the axial force of the internal fluid. Contains. An inner surface of the plastic pipe is provided with a stainless steel carcass having excellent buckling resistance against external pressure and corrosion resistance, and the carcass has an interlock structure that meshes with each other.

[0003]

However, this prior art fluid transportation pipe requires a carcass and a circumferential reinforcing layer portion in order to withstand the internal pressure and the lateral pressure of the plastic pipe, so that the number of assembling steps is reduced. In addition to low work efficiency, the plastic pipe and the carcass and the circumferential reinforcing layer are not adhered to each other but are only in frictional contact, so there is no restraint and low mechanical strength. Also, it was heavy in weight as a whole and was inconvenient for handling such as transportation.

It is an object of the present invention to provide a method for manufacturing a fluid transport pipe, which avoids the above-mentioned drawbacks, has a large mechanical strength against lateral pressure and internal pressure, can be reduced in weight, and is easy to manufacture. It is in.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention has an uncured fiber-reinforced resin wire wound around an inner plastic pipe and the outer surface of the uncured fiber-reinforced resin wire. It is an object of the present invention to provide a method for producing a fluid transport tube, which comprises extruding a plastic tube and curing the fiber-reinforced resin wire at the temperature of the plastic material at the time of extrusion to form the transport tube main body.

[0006]

As described above, when the outer plastic pipe is formed by extrusion so that the fluid transport pipe main body has the horizontally wound layer of the fiber reinforced resin wire interposed between the inner and outer plastic pipes, these components are bonded to each other. Therefore, it is possible to sufficiently withstand the lateral pressure and the internal pressure, the mechanical strength is improved, and the conventional carcass and the circumferential reinforcing layer portion are not required, and the overall weight is reduced.

Furthermore, when the fiber-reinforced resin wire is wound in an uncured state in a horizontal direction, it can be wound with a small radius of curvature so as to withstand a large internal pressure, and is hardened at the extrusion temperature of the outer plastic pipe. It does not require a separate curing step and is easy to manufacture.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to the drawings, an embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2 which show a fluid transport pipe 10 manufactured by the manufacturing method of the present invention. The transport tube main body 12 is mainly composed of a tube, the axial reinforcing layer 14 is provided on the transport tube main body 12, and the sheath 16 is provided on the axial reinforcing layer 14.

As shown in FIGS. 1 and 2, the transport tube main body 12 has an uncured fiber-reinforced resin wire (FRP wire) 20 wound around an inner plastic tube 18 at a small pitch. The outer plastic tube 22 is formed on the wound layer of the wire 20 by extrusion, and the FRP wire 20 is cured by the temperature of the plastic material at the time of extrusion. The inner and outer plastic tubes 18 and 22 are made of nylon, and the FRP wire 20 is formed, for example, by hardening an unsaturated polyester resin containing a curing retardant with glass fiber or carbon fiber.

The axial reinforcing layer 14 is used for the transport tube main body 1
It is formed by spirally winding a plurality of metal (for example, carbon steel) reinforcing strips 24 on the 2 at a large pitch. The sheath 16 is formed by extrusion-coating an anticorrosive plastic material such as nylon resin on the axial reinforcing layer 14.

As described above, when the fluid transport tube body 12 is formed by extruding the outer plastic tube 22 so that the horizontally wound layer of the FRP wire 20 is interposed between the inner and outer plastic tubes 18 and 22, these constituent elements 18 are formed. , 20 and 2
The two are glued together. Therefore, it is possible to sufficiently withstand the lateral pressure and the internal pressure, the mechanical strength is improved, and the conventional carcass and the circumferential reinforcing layer are not necessary, and the overall weight is reduced.

The following Table 1 shows a fluid transport pipe A having a conventional structure having a non-adhesive transport pipe body in which a carcass and a circumferential reinforcing layer are formed inside and outside a plastic pipe, and an adhesive transport pipe according to the above embodiment. The inner surface stress (kg / mm) applied to the inner surface of the fluid transport pipe when a lateral pressure of 3 ton / m is applied to the fluid transport pipe B manufactured by the present invention having a main body.
² ) shows the measurement results of the inner surface deformation amount (mm).

[0013]

[Table 1]

As can be seen from Table 1, the fluid transport pipe B manufactured according to the present invention has a significantly smaller inner surface deformation amount than the conventional fluid transport pipe A, and the mechanical strength against lateral pressure is improved. There is.

Table 2 shows the weight ratio of each element of the conventional fluid transport pipe A and the fluid transport pipe B manufactured by the present invention.

[0016]

[Table 2]

As can be seen from Table 2, the fluid transport pipe B according to the present invention does not use the relatively heavy metal carcass and the circumferential reinforcing layer used in the conventional fluid transport pipe A, The weight of the FRP wire is about 1/4 that of the metal reinforcement layer, so the total weight is 40%.
We were able to reduce by as much as%.

[0018]

According to the present invention, as described above, since the transport pipe main body which can reinforce the internal pressure and the lateral pressure applied to the fluid transport pipe is of the adhesive type, the mechanical strength against these pressures is high. Since the strength is improved and the weight is reduced as a whole, there is a practical benefit that handling such as transportation of the fluid transportation pipe is easy.

Further, the FRP embedded in the transportation pipe body
Since the wire is wound in the uncured state sideways, it can be wound with a small radius of curvature so that it can withstand a large internal pressure, and this uncured FRP wire is cured at the plastic extrusion temperature of the outer plastic tube. Therefore, there is no need for a separate curing step, and there is a practical advantage that manufacturing is easy.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a portion of a fluid transport tube manufactured by the method of the present invention.

2 is a cross-sectional view of the fluid transport tube of FIG.

[Explanation of symbols]

 10 Fluid Transport Pipe 12 Transport Pipe Main Body 14 Axial Direction Reinforcing Layer 16 Sheath 18 Inner Plastic Pipe 20 Fiber Reinforced Resin Wire 22 Outer Plastic Pipe 24 Metal Reinforcing Strip

Claims (1)

[Claims] 1. An uncured fiber-reinforced resin wire is wound horizontally on an inner plastic tube, an outer plastic tube is extruded on the uncured fiber-reinforced resin wire, and the fiber reinforced at the temperature of the plastic material at the time of the extrusion. A method for manufacturing a fluid transportation pipe, comprising curing a resin wire to form a transportation pipe body.