JPS60215188A - Terminal fitting for high-pressure fluid transport pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the terminal fitting of high-pressure fluid transport pipes such as oil pipes and water pipes installed on the seabed.

This type of high-pressure fluid transport pipe generally consists of a plastic pipe, inner and outer metal reinforcing layers provided at the -H of the plastic pipe, and a plastic jacket provided on the outer metal reinforcing layer. The fluid transport pipe has an end fitting for connecting to equipment or the like at its end. A prior art terminal fitting consists of a fitting body that is liquid-tightly fitted to the exposed end of a plastic pipe of a fluid transport pipe, and a cap that is liquid-tightly fitted to a plastic jacket and screwed onto the fitting body. , the outer metal reinforcing layer is fixed by a collar in the space between the fitting body and the cap, the inner metal reinforcing layer is exposed in the space, and the space is filled with a filler such as epoxy resin. It is formed by However, the terminal fittings of this prior art cannot be used when the filler is insufficiently filled or there are cavities in the filler, or when the transport fluid is at a very high temperature, the shrinkage force of the filler decreases and the The end of the metal reinforcing layer in the space between the collar and the metal fitting body that fixes the outer metal reinforcing layer when the terminal fitting is subjected to impact during installation, cracking the filler and reducing its compression resistance. It had the disadvantage that it became abnormal and easily destroyed by internal pressure.

An object of the present invention is to provide an end fitting for a high-pressure fluid transport pipe that can prevent destruction due to such internal pressure.

Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an end fitting 10 for a high-pressure fluid transport pipe according to the present invention, and a high-pressure fluid transport pipe 12 is connected to a plastic pipe 14. It consists of an inner and outer metal reinforcing layer 16,18 provided on the hill and a plastic jacket 20 provided on the outer metal reinforcing layer 18.

In the illustrated embodiment, the inner metal reinforcing layer 16 is.

A first layer 16a is formed by spirally winding a metal band with a substantially U-shaped cross section, and a metal band with a substantially inverted U-shaped cross section is placed on top of this first layer by straddling adjacent turns of the metal band of the first layer. The outer metal reinforcing layer 18 is formed by spirally winding a metal strip or metal wire into two layers at a pitch larger than that of the inner metal reinforcing layer M16. has been done.

The terminal fitting 10 includes a fitting main body 22 that is liquid-tightly fitted to the exposed end 14a of the plastic pipe 14 of the fluid transport pipe 12.
and a cap 24 that is fluid-tightly fitted to the end of the plastic jacket 20 and screwed onto the metal fitting body 22.

Liquid-tightness between the fitting body 22 and the plastic pipe 14 and between the cap 24 and the plastic jacket 20 is achieved by seals compressed by plugs 26, 28 placed between them and screwed onto the fitting body 22 and the cap 24. held by rings 30.32. In the space 23 between the fitting body 22 and the cap 24, the outer metal reinforcing layer 18 is fixed by inner and outer collars 34, 36, 34', 36', and the ends of the inner metal reinforcing layer 16 are stepped. is exposed to. The space 23 is filled with a filler 38 such as epoxy resin or a soft metal such as lead. Note that the collars 34 and 36 fix the metal strip or metal wire inside the outer metal reinforcing layer 18, and the collars 34' and 36'
The outer metal strip or metal wire is fixed at a position shifted in the axial direction from 4.36. Of course, the inner and outer metal strips or wires of the outer metal reinforcement fi 18 may be fixed together by the collars 34 and 35. on the end face of the metal fitting body 22 and the collar 3.
A reinforcing ring 40 is disposed between the reinforcing ring 40 and the reinforcing ring 40, and the filler 38 is filled so as to bury this reinforcing ring 40. Reinforcement ring 40
can be formed from a material with high mechanical strength such as plastic or fiber-containing hardened resin in addition to metal. As shown in FIG. 2, the reinforcing ring 46 includes a first adjustment ring portion 42 that has a concave surface 42a along the end surface of the collar 34 and engages with the collar 34, and is screwed into this adjustment ring portion 42. a second adjustment ring portion 44 that engages with the end surface of the plug 26 attached to the fitting body 22, and thus
The axial length can be adjusted by adjusting the screw engagement of the adjustment ring portions 42 and 44 with the plug? 6 and the collar 34.

In particular, as can be seen from the second section, the first adjustment ring portion 42 on the side that is in close contact with the collar 34 is provided with an annular protrusion 42b that wedges between the collar 34 and the inner metal reinforcing layer 16. The radius of curvature R of the concave surface 42a of the first adjustment ring portion is the sum of the radius of curvature R of the lower surface of the collar 34 and the thickness tl of the inner layer of the outer metal reinforcing layer 18, or the sum of R, tl, and the thickness of the further outer layer. Which sum is t2? As can be seen from FIG. 1, the reinforcing ring 40 has a relief 40a on the plug 26 side to enable the plug 26 to be screwed. Also, as you can see from Figure 2.

A through-hole and degassing hole 4 extends radially through the second adjustment ring portion 44 to allow the filler 38 to be injected into the inside of the reinforcing ring 40 and penetrate into the inner metal reinforcing layer 16.
4a, and a backing groove 44b into which the backing 46 engages is provided on the surface that engages with the plug 26. In this way, the space between the metal fitting body 22 and the collar 34 is closed by the reinforcing ring 40. Because it is reinforced, the compressive strength of the filler 38 will not be reduced even if there is insufficient filling of the filler 38 or cavities occur, or even if high-temperature fluid passes through it or shock is applied during installation, the compression resistance of the filler 38 will not decrease, especially when adjusting the adjustment ring. The filler 38 is provided with a through hole 44a into which the filler is injected.
Since the filler penetrates to the inner metal reinforcing layer 16, the corner between the collar 34 and the inner metal reinforcing layer 16, where a comparative effect is easily obtained, is also filled with the filler, so that internal pressure resistance is not reduced.

Note that this terminal fitting 10 has a plug 28. Cap 24.
Fit the collar 36, 36' onto the fluid transport tube 12 and peel off the end of the body transport tube 12.

Fitting the collars 34 , 34 ′ onto the outer metal reinforcing layer 18 , fixing the outer metal reinforcing layer 18 with the collars 34 , 36 , 34 ′, 36 ′, fitting the reinforcing ring 40 , fitting main body 22
, adjust the axial length of the reinforcing ring 40, fix the cap 24, fix the plug 28, and finally fix the filler 3.
8 can be filled and assembled.

According to the present invention, as shown in J:, the reinforcing ring reliably prevents destruction due to internal pressure in the space between the metal fitting body and the collar in the camp space.

In particular, the adjustment ring is provided with a radial through hole into which the filler is injected, and the filler penetrates into the inner metal reinforcing layer, which has the practical benefit of significantly improving internal pressure resistance.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of one half of the end fitting of a high-pressure fluid transport pipe according to the present invention, and FIG. 2 is a vertical cross-sectional view of the upper half of the metal reinforcing ring used in the present invention. --One terminal fitting,
l 2----1 High pressure fluid transport pipe, 14---Plastic pipe, 16.18-1---Inner and outer metal reinforcing layer. 2o--L--Plastic jacket, 22--11 Metal fitting body, 24-----Cap, 34, 36, 34
', 36'----collar, 38----filler, 40----one reinforcing ring. 44a---Continuous through hole and gas vent hole.

Claims (1)

[Claims] A spraying end of the plastic pipe of a high-pressure fluid transport pipe comprising a plastic pipe, inner and outer metal reinforcing layers provided on the plastic pipe, and a plastic jacket provided on the outer metal reinforcing layer. It consists of a metal fitting body that is liquid-tightly fitted to the metal fitting body, and a cap that is liquid-tightly fitted to the plastic jacket and screwed to the metal fitting body, and the end of the outer metal reinforcing layer is formed between the metal fitting body and the cap. In the end fitting of the NJfl fluid transport pipe, the end fitting of the NJfl fluid transport pipe is fixed by a collar in the space between, the end of the inner metal reinforcing layer is exposed in the space, and the space is filled with a filler,
A reinforcing ring is disposed between the fitting body and the collar at one end of the inner metal reinforcing layer exposed in the space between the fitting body and the cap, and the inner metal reinforcing layer is attached to the reinforcing ring. A high-pressure fluid transport pipe, characterized in that a radial through hole and gas vent hole extending up to terminal fittings.