JP2007285349A - Fluid transfer hose - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a marine hose capable of accurate detection of strain without sacrificing durability of a strain sensor. <P>SOLUTION: In the marine hose 1 provided with a pair of mounting flanges 2, a hose body 5 connecting base parts thereof to end parts respectively, and the strain sensor 10 detecting a stress condition of the hose main body, the strain sensor 10 is arranged at a longitudinal direction position which is in a distance of 1.5 m or less from a flange surface 2a of the mounting flange 2, apart from the mounting flange 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a marine hose used for transporting crude oil and refined oil from a tanker moored at an offshore mooring facility and configured to detect an internal stress state, and in particular, to improve the accuracy of detecting the stress state. Related to what can be.

Conventionally, a sensor that detects internal strain is provided, and a signal representing the detection result from this sensor is transmitted to a device outside the hose, and the life of the marine hose is estimated based on the magnitude of the detected strain. In addition, when an abnormally large distortion occurs, it is known that this is determined to be abnormal and an alarm is issued (see, for example, Patent Document 1). This strain sensor has been used by being affixed to the base of a highly rigid mounting flange so as not to be subjected to a large bending deformation from the viewpoint of ensuring its durability.
JP 11-153284 A

  However, when the strain sensor is placed on the base of the flange, the durability can be ensured, but the strain is too small, and the S / N ratio for the noise component cannot be increased, and the strain detection accuracy decreases. There is a problem that it is difficult to accurately perform life prediction and distortion abnormality determination.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a marine hose that can detect strain with high accuracy without sacrificing durability of the strain sensor. To do.

  <1> is a marine hose comprising a pair of mounting flanges, a hose body having an end joined to each of the bases, and a strain sensor for detecting the stress state of the hose body, the strain sensor, The marine hose is disposed at a distance from the mounting flange at a position in the length direction separated from the flange surface of the mounting flange by a distance of 1.5 m or less.

  <2> is a marine hose obtained by attaching the strain sensor to the surface of the hose body in <1>.

  <3> is a marine hose in which the strain sensor is embedded in the hose body in <1>.

  <4> is a marine hose obtained by arranging the strain sensors at four or more locations on the circumference in any one of <1> to <3>.

  <5> is any one of <1> to <4>, wherein a power supply wiring to be supplied to the strain sensor and a signal wiring for taking out a signal from the strain sensor are disposed, and these wirings are It is a marine hose of Claims 1-4 connected with the terminal connector provided in the attachment flange.

  According to <1>, since the strain sensor is arranged at a position in the length direction where the distance from the flange surface of the mounting flange is within 1.5 m away from the mounting flange, as described in detail later, In addition to making the measurement highly accurate, damage to the strain sensor due to bending deformation can be prevented, and durability can be ensured.

  According to <2>, since the strain sensor is attached to the surface of the hose body, maintenance of the strain sensor can be facilitated.

  According to <3>, since the strain sensor is embedded in the hose body, the strain sensor and the surrounding rubber part are firmly bonded to make accurate strain measurement, and the strain sensor is embedded before vulcanization. By doing so, the strain sensor can be easily attached.

  According to <4>, since the strain sensors are arranged at four or more locations on the circumference, stresses in a plurality of directions can be obtained as will be described in detail later.

  According to <5>, the power supply wiring to be supplied to the strain sensor and the signal wiring for taking out the signal from the strain sensor are arranged, and these wirings are connected to the terminal connector provided on the mounting flange. Therefore, for example, the stress state of the marine hose can be centrally managed with an apparatus provided on the one-point mooring buoy.

  A marine hose according to an embodiment of the present invention will be described with reference to the drawings. As shown in the conceptual diagram in FIG. 1, the marine hose 1 usually has ten to several tens of them connected coaxially through the respective mounting flanges 2 to form a hose line 31. Used for transporting refined oil. The hose line 31 is installed between a ship 32 such as a tanker and a one-point mooring buoy 33 floating on the sea. The marine hose 1 used here is a floating type hose that is used while always floating, and FIG. 2 is a cross-sectional view showing the end of this type of marine hose 1. At least one flange base portion 22 which is a joint portion of the mounting flange 2 to the hose body 5 is projected to the cylindrical portion 24 outward in the radial direction. The ring portions 25A, 25B, and 25C are integrally provided.

  The hose body 5 includes a tube rubber layer 3 that hermetically seals a liquid to be transported, one or more pressure-resistant cord layers 4A, 4B, and 4C, and an intermediate rubber layer 9 in which body wires 13 are arranged in a spiral shape. The outer rubber layer 8 for protecting the outer surface is laminated in this order from the inner side to the outer side in the radial direction, and the pressure-resistant cord layers 4A, 4B, 4C are fastening wires 6A provided at both ends of the hose body 5. , 6B, and 6C are folded back to be fastened to the fastening wires 6A, 6B, and 6C.

  The hose body 5 and the flange base 22 are joined by bonding the tube rubber layer 3, the pressure-resistant cord layers 4A, 4B, and 4C, the intermediate rubber layer 9, and the outer rubber layer 8 to the flange base 22. At the same time, the displacement of the fastening wires 6A, 6B, 6C in the hose length direction is constrained by the ring portions 25A, 25B, 25C.

  In the marine hose 1, a strain sensor 10 that detects the stress state of the hose body 5 is not directly attached to the flange base 22 but is provided at a position away from the flange base 22. In the case of the example shown in FIG. 1, the strain sensor 10 is provided by being attached to the surface of the hose body 5, and in this case, the strain sensor 10 is covered outside the strain sensor 10 so that the strain sensor 10 is not directly exposed and damaged. A rubber sheet 19 is pasted. Further, the strain sensor 10 needs to be arranged at a distance of 1.5 m or less measured along the hose length direction from the flange surface 2a.

  The present invention is characterized by the position where the strain sensor is attached. If the strain sensor is directly attached to the flange base 22, the rigidity of the metal flange 2 is high, so that the strain obtained for the same stress is obtained. Therefore, the signal level from the strain sensor 10 is weakened, and the S / N ratio cannot be increased, and the accuracy of the strain data is deteriorated. On the other hand, in the present invention, since the strain sensor is disposed in the rubber portion that is located away from the flange base portion 22 and can obtain a large amount of deformation even with the same stress, the S / N ratio is sufficiently high. Therefore, distortion can be measured with high accuracy.

  In addition, when the strain sensor 10 is disposed at a position in the longitudinal direction at a distance exceeding 1.5 m, the strain sensor 10 is easily separated from the highly rigid flange 2 so that it is susceptible to local bending deformation, and the strain sensor is broken. In addition, the correlation with the stress at the point where the degree of fatigue of the hose body 5 is the highest becomes low, making it difficult to use it for predicting the life of the hose body 5 and the like.

  Here, the strain sensors 10 are preferably arranged apart from each other at four or more locations in the circumferential direction. For example, the strain sensors 10 are arranged at intervals of 90 ° in the circumferential direction so that they are arranged in a plane perpendicular to the length direction. It is possible to detect a bending strain in two directions orthogonal to each other, a tensile strain and a compressive strain in the length direction, and correlate in advance the correlation between these strains and the stress at the point of highest fatigue in the hose body. By obtaining it, the stress in each direction acting on the point with the highest degree of fatigue can be estimated at any time.

  As a manufacturing method of the marine hose 1 in this case, after the entire marine hose 1 is vulcanized and completed, the strain sensor 10 is pasted on the surface of the hose body 5, and then the cover rubber sheet 19 is pasted. Preferably, even if the strain sensor 10 breaks down, it can be easily replaced and repaired immediately.

  A wiring 27 for supplying power to the strain sensor 10 and extracting a signal output from the strain sensor 10 is embedded in the outer rubber 8, and the end of the wiring 27 opposite to the strain sensor 10 is connected to the nearest flange. It is preferable to connect to the terminal connector 16 arranged in FIG. Power can be supplied from the single point mooring buoy 33 to the strain sensors 10 of all marine hoses 1 connected in series, or signals from these strain sensors 10 can be collected in the single point mooring buoy 33. .

  Furthermore, it is preferable to attach the information processing unit 15 to the mounting flange 2. Here, the information processing unit 15 includes a central processing unit (CPU), a clock unit, and a storage unit. The clock unit outputs time data, and the storage unit stores information on stress values by the strain gauge 10. Is stored together with the time data. Further, the storage unit stores unique identification information for each marine hose 1. The information processing unit 15 and the terminal connector 16 are connected by a signal line, but they may be integrated.

  The wiring 28 is preferably wound spirally or embedded in the hose in a zigzag shape in order to withstand bending of the hose. Further, the terminal connector 16 of the marine hose 1 farthest from the mooring facility may be left open if there is no effect on the information collection from the marine hose 1, but if there is an effect, a terminal device may be attached to the terminal connector 16. .

  FIG. 3 is a modified example in which the arrangement of the strain sensor 10 in the marine hose 1 of the embodiment shown in FIG. 2 is changed. In the marine hose 1A, the strain sensor 10A is not attached to the surface of the hose body 5. The marine hose 10 is different from the marine hose 10 of the above embodiment only in that it is embedded in the hose body 5, for example, in the intermediate rubber layer 9 or the outer rubber layer 8, and other points, for example, a strain sensor 10A. Is not directly affixed to the flange base 22, but is provided at a position away from the flange base 22 and is disposed at a position within 1.5m from the flange surface 2a. Is exactly the same as the marine hose 1 of the above embodiment.

  In the case of the above-described modification, the strain sensor 10A is preferably embedded in rubber before vulcanizing the entire marine hose, and vulcanized in this state. It can be integrated with the part, and the work required for embedding can be facilitated.

  FIG. 4 is an enlarged view of a portion where the hose line 31 is connected to the one-point mooring buoy 33 that is a mooring facility in the management system for managing the marine hose 1, and FIG. 5 is a diagram of the management system for managing the marine hose 1. It is a block diagram. The one-point mooring buoy 33 includes a connecting portion 34 for connecting to the flange 2 of the marine hose 1 at one end of the hose line 31, and the wiring 28 from each marine hose 1 is provided inside the one-point mooring buoy 33. Are connected to each other through the terminal connector 36 of the connecting portion 34, the information collecting device 35 for collecting information transmitted from the strain gauge 10 of each marine hose 1, the information collecting device 35, and the wirings 27, 28. And a power supply device 39 for supplying power to the strain gauge 10 and the information processing unit 15 in each marine hose 1, and a portable computer 41 is connected to the upper surface of the one-point mooring buoy 33. In addition, an external connection unit 40 for taking out information of the strain gauge 10 accumulated in the information accumulation device 35 as data is provided. When the computer 41 is not connected, the external connection unit 40 is covered with a lid so that seawater does not enter the inside.

  The information accumulation device 35 issues a command to read information on the strain gauge 10 from the terminal connector 36 of the connecting portion 34 to the information processing portion 15 of each marine hose 1 and accumulates information from the information processing portion 15. (CPU) 37 and a recording unit 38 for recording a signal transmitted from each marine hose 1.

  As the power supply device 39, a solar battery or a battery can be used. In the case where a solar battery is used for the power supply device 39, since charging is always performed by sunlight, power can be continuously supplied to the strain gauge 10 of each marine hose 1. Strain generated in the hose can be detected.

  In the embodiment described above, since the power supply device 39 for supplying power to the strain gauge 10 of each marine hose 1 is installed in the one-point mooring buoy 33 that is a mooring facility, each marine hose 1 is provided with a power supply device. Compared to the above, since large electric power can be stably supplied to the strain gauge, information on the marine hose can be obtained stably. Furthermore, since the power supply device 39 is installed only in the mooring facility, the maintenance of the power supply device is facilitated as compared with the case where each marine hose 1 is provided with the power supply device.

  Next, operation | movement of the management system of such a marine hose 1 is demonstrated with reference to FIG. 2 and FIG. The strain gauge 10 in each marine hose 1 always detects the strain in the marine hose 1, and when the central processing unit of the information processing unit 15 detects a strain greater than the minimum set value, The stress value is stored in the storage unit together with the time data of the clock unit.

  The central processing unit 37 of the information accumulating device 35 calls and executes a program stored in the storage unit 38, and sequentially identifies identification information unique to the information processing unit 15 of each marine hose 1 via the wiring 28 at a constant cycle. Outputs information read command.

  The information processing unit 15 of each marine hose 1 receives the unique identification information and the information read command from the wiring 28, and receives the received unique identification information and the marine hose 1 stored in the storage unit in the information processing unit 15. If the identification information matches when compared with the unique identification information, the information processing unit 15 of the matched marine hose 1 reads out the distortion information from the storage unit together with the time data information, and the information is unique. Is output to the information accumulating device 35 of the one-point mooring buoy 33 via the wiring 28.

  When the central processing unit 37 of the information accumulation device 35 receives strain information and time data information from each marine hose 1, the central processing unit 37 stores the information in the storage unit 38 for each marine hose 1.

  In this manner, the storage unit 38 stores information on the strain gauge 10 for each marine hose 1 over a certain period in the past.

  A marine hose maintenance worker goes to the buoy 33 by ship to connect this information to the external connection part 40 of the buoy 33 and connects the portable computer 41 as information acquisition means to take it into the computer 41. And the computer 41 can detect the marine hose 1 to which an abnormal external force is applied by displaying this information on the display unit, and based on this, the marine hose 1 can be detected at an appropriate time before breaking. It becomes possible to replace the hose.

  As described above, it is not necessary for the maintenance worker to approach the individual marine hose 1 and read the strain gauge information from the individual marine hose 1, and to read the marine hose information from the single mooring buoy 33 in a batch. Since the damaged marine hose 1 is detected, it is possible to reduce the labor hours of maintenance workers.

  As shown in FIG. 6, a transmission / reception device 42 is provided instead of the external connection unit 40 in the management system shown in FIG. 5, and information from the strain gauge 10 output from the central processing unit 37 is installed on land by radio. It is also possible to output to the computer 41 which is an external information acquisition means via the transmission / reception device 43. In this case, power is supplied to the transmission / reception device 42 from the power supply device 39. A mobile phone may be used for the transmission / reception device 42 and the transmission / reception device 43. In FIG. 6, the same parts as the one-point mooring buoy shown in FIG. 5 are denoted by the same reference numerals, but description of these parts is omitted to avoid duplication.

  When the transmission / reception devices 42 and 43 are used, the information on the marine hose 1 is collectively read from the one-point mooring buoy 33, thereby reducing the maintenance worker's working time and reducing labor, as well as one-point mooring. Since the buoy 33 is immediately sent by radio to the computer 31 via the transmitting / receiving devices 42 and 43, the marine hose 1 to which an abnormal external force is applied can be detected in real time.

  In addition to the case where a damage detection sensor such as a strain gauge is provided for all of a plurality of connected marine hoses as described above, every other marine hose is provided with a damage detection sensor, or every other marine hose. The present invention can be applied to a case where a hose is provided with a damage detection sensor, that is, if a damage detection sensor is provided to at least one of the plurality of marine hoses, it can be applied to any of such cases. it can.

  The marine hose has been described as a floating type that is always used while floating. However, the present invention is a submarine type that is used under the sea surface, and a floating type that is floated on the sea surface when used and submerged when not in use. This can also be applied to the case.

  The present invention also relates to a buoy used between a pipe line end manifold (PLEM: Pipe Line End Manifold) connected to an onshore tank or the like and laid or buried on the seabed and a one-point mooring buoy. It can also be applied to the lower hose.

It is a conceptual diagram which shows the example of installation of a marine hose. It is sectional drawing which shows the edge part of the marine hose of embodiment which concerns on this invention. It is sectional drawing which shows the edge part of the marine hose of a modification. It is an enlarged view of a portion where a hose line connecting marine hoses in series is connected to a single mooring buoy. It is a block diagram which shows the management system which manages a marine hose. It is a block diagram which shows the modification of a management system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1A Marine hose 2 Mounting flange 2a Flange surface 3 Tube rubber layer 4A, 4B, 4C Pressure-resistant cord layer 5 Hose body 6A, 6B, 6C Fastening wire 8 Outer rubber layer 9 Intermediate rubber layer 10, 10A Strain sensor 13 Body wire 15 Information processing section 16 Terminal connector 18 Floater 19 Cover rubber sheet 22 Flange base 24 Flange cylindrical section 25A, 25B, 25C Ring section 27, 28 Wiring 31 Hose line 32 Ship 33 Single point mooring buoy 34 Connection section 35 Information accumulation device 37 Central processing Unit 38 Storage unit 39 Power supply device 40 External connection unit 41 Computer 42, 43 Transmission / reception device

Claims (5)

In a marine hose comprising a pair of mounting flanges, a hose body having an end joined to each of their bases, and a strain sensor for detecting the stress state of the hose body,
A marine hose in which the strain sensor is disposed away from the mounting flange at a longitudinal position where the distance from the flange surface of the mounting flange is within 1.5 m.   The marine hose according to claim 1, wherein the strain sensor is attached to a surface of a hose body.   The marine hose according to claim 1, wherein the strain sensor is embedded in the hose body.   The marine hose according to any one of claims 1 to 3, wherein the strain sensors are arranged at four or more locations on the circumference.   A power supply wiring to be supplied to the strain sensor and a signal wiring for taking out a signal from the strain sensor are provided, and these wirings are connected to a terminal connector provided on the mounting flange. 4. The marine hose according to any one of 4.

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