JP5343696B2 - Fluid transfer hose - Google Patents

Description

  The present invention relates to a fluid transport hose, and more particularly to a fluid transport hose that can detect leakage of high-pressure fluid due to fracture of an inner reinforcing layer group with high accuracy and high reliability.

  In large-diameter hoses for cargo handling represented by marine hoses, it is necessary to make the structure so that oil and other fluids sent out at high pressure do not leak outside the hose and cause seawater contamination accidents. In the unlikely event that a leak occurs, it is necessary to promptly notify the outside. For this reason, this type of fluid transport hose has a reinforcing layer group consisting of a plurality of layers outside the inner rubber layer that is resistant to erosion with respect to the fluid, and the inner reinforcing layer group separated from the inner and outer layers. Leakage that detects the high-pressure fluid flowing into the buffer layer when the inner rubber layer and the inner reinforcement layer group break and the internal structure is provided with a buffer layer made of foam material such as sponge between the reinforcing layer group Detection means is provided near the end of the hose.

  As the principle of this leak detection means, for example, as shown in Patent Document 1, one that visually confirms the arrival of fluid at the end of the hose and one that measures a pressure change in the hose body are well known. .

  However, the former visual detection is highly reliable because it confirms the presence of leaking fluid, but when the amount of leakage is small, the fluid does not reach the detector, so further improvement in detection accuracy has been desired. . In addition, the latter detection by pressure change has high detection accuracy because it can be detected before the fluid arrives, but it also has a problem of low reliability because it detects pressure change due to causes other than fluid leakage. .

Japanese Patent Laid-Open No. 2003-21568

  An object of the present invention is to provide a fluid transfer hose capable of detecting leakage of high-pressure fluid due to fracture of an inner reinforcing layer group with high accuracy and high reliability.

  The fluid carrying hose of the present invention that achieves the above object has an inner reinforcing layer in which a reinforcing layer group consisting of a plurality of layers is disposed between an inner rubber layer and a cover rubber layer, and the reinforcing layer group is separated into the inside and the outside. In the fluid conveyance hose, a buffer layer made of a foam material is disposed between the group and the outer reinforcing layer group, and at least one fluid leakage detection means is provided at one end in the hose axial direction. Is a leak detector that houses a translucent hard plate that is damaged by a predetermined pressure and a color plate arranged on the back side of the hard plate, and has an observation window facing the front side of the hard plate. Further, it is characterized in that it is detachably attached to an attachment port communicating with the buffer layer in an airtight state.

  The translucent hard plate is preferably a ground glass plate. Further, it is desirable that the leak detector is screwed to the mounting opening via the packing.

  The fluid conveyance hose of the present invention is suitably used as a marine hose for petroleum conveyance.

  According to the fluid transfer hose of the present invention, the leakage detection means accommodates a translucent hard plate that is damaged by a predetermined pressure, and a color plate disposed on the back side of the hard plate, and the hard plate. Since the leak detector having an observation window facing the surface side of the hose is detachably attached to the attachment port communicating with the buffer layer of the hose body in an airtight state, the buffer layer pressure rise is translucent. It can be confirmed by visual recognition of the color plate accompanying the breakage of the leak, and by checking the presence or absence of fluid when the airtight state of the leak detector is released, the pressure rise is caused by the breakage of the inner reinforcing layer group Since it can be determined whether or not it is caused by leakage of the high-pressure fluid, leakage of the high-pressure fluid due to the fracture of the inner reinforcing layer group can be detected with high accuracy and high reliability.

It is a partial cross section figure which shows the edge part structure of the hose for fluid conveyance which consists of embodiment of this invention. It is an assembly sectional view showing the structure of a leak detector. FIG. 3 is a top view of the leak detector shown in FIG. 2. It is sectional drawing of the AA arrow shown in FIG. It is sectional drawing explaining the method of attaching a leak detector to an attachment port. It is sectional drawing which shows the structure of a leak detection means. It is sectional drawing which shows a state when a leak detection means detects the pressure rise of a buffer layer. It is sectional drawing which shows a state when a leak detection means confirms the presence or absence of leaked fluid.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows an end structure of a fluid transfer hose according to an embodiment of the present invention.

  In this fluid transfer hose, a connection fitting 3 is attached to an end of a hose body 1 via an inner rubber layer 2 in a liquid-tight manner. The structure of the hose body 1 is configured by arranging a plurality of reinforcing layer groups between the inner rubber layer 2 and the cover rubber layer 4. The plurality of reinforcing layer groups are formed by laminating a first inner carcass layer 5, a spiral wire reinforcing layer 6, a second inner carcass layer 7, a buffer layer 8, and an outer carcass layer 9 in order from the inner rubber layer 2 side. ing.

  The inner rubber layer 2 is made of a material having excellent erosion resistance to the fluid flowing in the hose. The first inner carcass layer 5 is formed by laminating a plurality of reinforcing layers made of organic fiber cords arranged in a bias in the hose axial direction so that the cords cross each other. A part is turned back at the end of the hose body 1. The second inner carcass layer 7 is formed by laminating a plurality of reinforcing layers made of organic fiber cords arranged in a bias in the hose axial direction so that the cords cross each other. These inner carcass layers 5 and 7 mainly provide the hose body 1 with axial strength and moderate flexibility.

  The spiral wire reinforcing layer 6 is configured by winding a metal wire in a spiral shape around the outer periphery of the first inner carcass layer 5 at a predetermined pitch, and mainly gives the hose body 1 strength in the circumferential direction, and the hose. It prevents kink from being generated when the main body 1 is bent, and further prevents the hose main body 1 from being crushed by external pressure.

  Similar to the inner carcass layers 5 and 7, the outer carcass layer 9 is formed by laminating a plurality of reinforcing layers made of organic fiber cords arranged in a bias in the hose axial direction so that the cords cross each other. ing.

  The buffer layer 8 is mainly composed of a foam material, and is disposed between the second inner carcass layer 7 and the outer carcass layer 9. As the foam material, natural rubber sponge or polyethylene sponge is preferably used. When the inner rubber layer 2 and the inner carcass layers 5 and 7 are broken by the high pressure fluid, the buffer layer 8 absorbs and relaxes the pressure of the high pressure fluid by the foaming material being crushed, and the breaking propagates to the outer carcass layer 9. It is something to avoid.

  In addition to the above-described components, the hose body 1 may be provided with a buoyancy layer that provides buoyancy to the hose body 1 between the outer carcass layer 9 and the cover rubber layer 4.

  Leakage detection means 10 for detecting the leakage of fluid is provided in the vicinity of the end of such a fluid conveyance hose. The leak detection means 10 includes a leak detector 11 and an attachment port 12 to which the leak detector 11 can be detachably attached. The attachment port 12 is fixed to the surface of the connection fitting 3 and communicates with the buffer layer 8 through a strainer 13 and a conduit 14 embedded in the buffer layer 8.

FIG. 2 shows the structure of the leak detector.
The leak detector 11 accommodates a metal container 17 whose opening is closed with a translucent hard plate 16 (for example, ground glass plate) in a resin outer cylinder 15 having an open bottom. The bottom surface is supported by a back cover 18 that can be attached to and detached from the outer cylinder 15. The hard plate 16 is set to a predetermined breaking strength by adjusting the thickness and material. In addition, a color plate 19 provided with a color for calling attention (for example, red or yellow) is laid in the metal container 17. Instead of the color plate 19, the bottom surface of the container 17 may be colored directly. As shown in FIG. 3, the upper portion of the outer cylinder 15 has a polygonal shape for easy handling, and an observation window 20 for observing the inside is provided at the center. Further, as shown in FIG. 4, a plurality of through holes 21 are provided in the peripheral edge portion and the center portion of the back cover 18.

  As shown in FIG. 5, the leak detector 11 has a screw portion 22 on the outer side surface of the outer cylinder 15 screwed with a screw portion 23 on the inner side surface of the attachment port 12, thereby allowing the leak detector 11 to pass through a rubber packing 24. It attaches to the attachment port 12 in an airtight state so as to be detachable.

  The operation of the fluid transfer hose provided with such a leak detector 11 will be described below.

  In the normal state shown in FIG. 6, when the pressure in the buffer layer 8 of the hose body 1 rises for some reason, a high pressure is applied to the outer cylinder 15 through the strainer 13, the conduit 14 and the through hole 21. When the pressure is equal to or higher than the predetermined breaking strength of the translucent hard plate 16, the hard plate 16 is damaged as shown in FIG. become able to.

  When the color plate 19 can be easily visually recognized, as shown in FIG. 8, the leak detector 11 is loosened to release the airtight state, and the inside of the outer cylinder 15 is depressurized. At this time, if the pressure increase in the buffer layer 8 is due to the inflow of high-pressure fluid into the buffer layer 8 due to the fracture of the inner rubber layer 2 and the inner carcass layers 5, 7, the strainer 13 and the conduit Since the fluid is guided to the attachment port 12 through 14 and enters the outer cylinder 15 from the through hole 21, the presence of the fluid can be confirmed visually through the observation window 20. However, if the cause is other than that, the fluid does not enter the outer cylinder 15, so that it can be determined that no leakage of the high-pressure fluid has occurred.

  As described above, the pressure increase in the buffer layer 8 is detected with high accuracy, and the pressure increase is caused by the inflow of the high-pressure fluid into the buffer layer 8 when the inner rubber layer 2 and the inner carcass layers 5 and 7 are broken. Therefore, it is possible to detect the leakage of the high-pressure fluid due to the fracture of the inner reinforcing layer group with high accuracy and high reliability.

  Even when only the pressure increase in the buffer layer 8 is detected and the presence of the high-pressure fluid cannot be visually confirmed, it is desirable for safety to separately check the soundness of the hose body 1 by a water pressure test or the like.

  The use of the fluid transfer hose of the present invention is not particularly limited, but it is preferably applied as a large-diameter hose for fluid cargo handling, particularly for transporting oil between an offshore tanker and a land storage tank. It can be suitably used for a marine hose.

DESCRIPTION OF SYMBOLS 1 Hose main body 2 Inner surface rubber layer 3 Connection metal fitting 4 Cover rubber layer 5 1st inner side carcass layer 6 Spiral wire reinforcement layer 7 2nd inner side carcass layer 8 Buffer layer 9 Outer carcass layer 10 Leakage detection means 11 Leakage detector 12 Attachment port 13 Strainer 14 Conduit 15 Outer cylinder 16 Hard plate 17 Container 18 Back cover 19 Color plate 20 Observation window 21 Through hole 22 Screw part 23 (outside cylinder) Screw part 24 (attachment port) Packing

Claims (4)

A reinforcing layer group consisting of a plurality of layers is disposed between the inner rubber layer and the cover rubber layer, and the reinforcing layer group is made of a foam material between the inner reinforcing layer group and the outer reinforcing layer group separated into the inner and outer layers. In the fluid transport hose in which the buffer layer is disposed and the fluid leakage detection means is provided at least at one end in the hose axial direction.
The leakage detection means accommodates a translucent hard plate that is damaged by a predetermined pressure and a color plate disposed on the back side of the hard plate, and has an observation window that faces the front side of the hard plate. A fluid transfer hose, wherein a leak detector is detachably attached to an attachment port communicating with the buffer layer in an airtight state.   The fluid transfer hose according to claim 1, wherein the translucent hard plate is a ground glass plate.   The fluid conveyance hose according to claim 1 or 2, wherein the leak detector is screwed into the attachment port via a packing.   It is a marine hose for oil conveyance, The hose for fluid conveyance in any one of Claims 1-3.

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