JP2011053080A - Leakage inspection implement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a leakage inspection implement which can prevent forceful leakage of a fluid and enables leakage inspection with high working efficiency. <P>SOLUTION: The leakage inspection implement 1 includes a band part 3 having a two-layered structure of a transmitting layer 5 and a rubber magnet layer 7 and having window parts 25, and a holding band 11. The implement 1 is fitted on a flange joint part 50 by bringing the band part 3 into close contact with the lateral peripheral surface of the flange joint part 50 from the rubber magnet layer 7 side and by winding the holding band 11 on the band part 3 from the top surface side thereof and combining buckles 15a and 15b together. In the leakage inspection, scattering or the like of the fluid is prevented even when the leakage of the fluid is forceful, while checking the presence or absence of the leakage through the window parts 25. Since fitting and removal can be performed with ease and bolts 55 can be left to view, the leakage inspection can be performed with ease and more safety without impairing the working efficiency. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a leakage inspection instrument, and more particularly to a leakage inspection instrument that can be used for leakage inspection of a pipe joint such as a flange joint.

  For example, in a facility such as a chemical industrial plant, a transport pipe for transporting a fluid is disposed. Such a transport pipe is configured by connecting individual pipes at several pipe joint portions. In such a pipe joint of a transport pipe, fluid leakage at the joint portion may occur rarely due to various factors. Naturally, such leakage is not preferable, and depending on the nature and temperature of the fluid flowing in the transport pipe, the equipment may be seriously damaged or the worker may be exposed to danger. .

  In order to prevent damage caused by the occurrence of fluid leakage from the pipe joint, it is sometimes necessary to inspect the leakage. The leak inspection is performed, for example, when a transport pipe that has not been used for a while is used again. The leak inspection is actually performed by flowing the fluid through the transport pipe and checking whether or not the leak has occurred by the operator. Thereby, it is possible to use the transport pipe safely and reliably after confirming whether or not the fluid can be continuously supplied to the transport pipe and appropriately dealing with the portion where the leakage occurs.

  Patent Document 1 listed below discloses a bag-like liquid leak detection member attached to a valve or a joint portion of a liquid transport pipe. This detection member is formed in a bag shape, and is used so as to wrap the entire valve or the like. When a liquid leak occurs from a valve or the like, the leaked liquid is collected in a liquid reservoir portion constituted by a bottom portion and both side edge portions of the detection member, and scattering of the leaked liquid is prevented. A composition containing, for example, an acid-base indicator is applied to the inside of the detection member, and it can be confirmed from the outside that liquid leakage has occurred.

JP 2006-56539 A

  By the way, conventionally, the leakage inspection is performed by visually confirming the pipe joint portion. Therefore, if there is a location where leakage actually occurs, fluid leaks from the site to the outside of the transport pipe at the time of leakage inspection. At this time, if the momentum of fluid leakage is strong, an operator or the like may be exposed to the leaked fluid. In particular, when the worker is performing maintenance work on the pipe joint portion, the possibility that the worker will come into contact with the leaked fluid increases. In order to prevent this, it is conceivable to wind a waste cloth around the pipe joint. In this case, it is difficult to detect the presence of leakage, and it takes time to attach or remove the waste cloth. .

  Here, it is conceivable to use the detection member described in Patent Document 1 at the time of leakage inspection. However, this detection member substantially completely wraps the target pipe joint, and due to its structure, many procedures are required when it is attached to the pipe joint. That is, the transport pipe has many pipe joint portions, and much labor is required to attach such a detection member to each pipe joint portion. Further, since the joint portion is covered with the detection member as it is, it is not possible to perform the tightening / loosening operation of the bolt provided on the joint with the detection member attached. Moreover, this detection member is large-sized, and its structure is relatively complicated, such as a snap button attachment portion, an adhesive sheet attachment portion, and a heat seal portion, and the manufacturing cost is high. In particular, when trying to increase the size of a pipe joint that can be targeted, the detection member also becomes considerably large, and thus the manufacturing cost tends to be higher. When leak inspection is performed on a large number of transport pipes at the same time, the problem in terms of cost and work efficiency becomes particularly large.

  The present invention has been made to solve such a problem, and provides a leakage inspection instrument that can prevent fluid from leaking vigorously and that can perform leakage inspection with high work efficiency. It is intended to provide.

  In order to achieve the above object, according to one aspect of the present invention, the leakage inspection instrument is used by being wound around a pipe joint portion of a transport pipe for transporting a fluid, and is provided in a belt-like belt portion and the belt portion. A holding means for holding the belt portion in a state of being wound around the pipe joint portion, and a window portion provided in at least a part of the belt portion so as to transmit visible light from the upper surface side of the belt portion to the lower surface side of the belt portion The belt portion has a structure including at least two layers of a transmission layer constituting the window portion and a base material layer at least partially overlapping the transmission layer in a top view, and the window portion includes the base material layer. Is provided on the belt portion by removing a part of the base material layer while leaving the other part of the base material layer.

  Preferably, the leakage inspection instrument has at least a permanent magnet portion as a holding means that is attracted to a pipe joint portion that is a ferromagnetic body by a magnetic attraction force.

  Preferably, the permanent magnet part is a bonded magnet having flexibility and forms a base material layer.

  Preferably, the leakage inspection instrument is disposed as a holding means at least on the upper and lower surfaces of the belt portion and engaged with each other, and on the upper surface of the belt portion along the belt portion, from the upper surface side of the belt portion. One of the holding bands wound around the pipe joint portion is provided.

  Preferably, the leakage inspection instrument further includes an indicator part which is provided on the lower surface side of the window part and whose appearance is changed by contact with the fluid.

  According to these inventions, when the leakage inspection instrument is wound around the pipe joint portion, the fluid leaking from the leakage portion is blocked by the belt portion, and the leaked fluid is not scattered around. In addition, the operator can easily confirm the presence or absence of leakage through the transmission part. In addition, the leakage inspection instrument can be easily used simply by winding it around the pipe joint. Therefore, it is possible to provide a leakage inspection instrument that can prevent the fluid from leaking vigorously and can perform a leakage inspection with high work efficiency.

It is a top view of the leak test | inspection instrument in the 1st Embodiment of this invention. It is a bottom view of a leakage inspection instrument. It is sectional drawing in the AA of FIG. It is a perspective view which shows the usage method of a leak test | inspection instrument. It is a perspective view which shows the leak test | inspection instrument of the state attached to the flange coupling part. It is a top view of the leakage inspection instrument in the 2nd Embodiment of this invention. It is sectional drawing in the BB line of FIG. It is a top view of the leak test | inspection instrument which concerns on the modified example of 2nd Embodiment. It is sectional drawing in CC line of FIG. It is a perspective view of the leak test | inspection instrument in the 3rd Embodiment of this invention.

  Hereinafter, a leakage inspection instrument according to an embodiment of the present invention will be described.

  The leak inspection instrument can be used at the time of leak inspection of a pipe joint portion of a transport pipe for transporting a fluid. The leakage inspection instrument is used by being wound around a pipe joint. Examples of the fluid flowing through the transport pipe include liquids such as water and chemicals, and gases such as vapor and gas.

  [First Embodiment]

  FIG. 1 is a plan view of a leakage inspection instrument 1 according to the first embodiment of the present invention.

  Referring to the drawing, the leakage inspection instrument 1 roughly has a band portion 3 and a holding band 11 (an example of a holding means). The band 3 is a band-shaped member having flexibility. The holding band 11 is a band-like rubber band and is attached to the band portion 3 by a rivet 13. At both ends of the holding band 11, male and female buckles 15a and 15b made of, for example, synthetic resin and connectable to each other are attached. The length of the holding band 11 on the side where the buckle 15 a is attached can be adjusted by an adjuster 17.

  A transmission layer 5 is provided on the upper surface of the band 3. The transmission layer 5 is made of, for example, a flexible film-like synthetic resin. The transmission layer 5 is made of a material that is colorless and transparent and transmits visible light. A plurality of window portions 25 are provided in the central portion in the width direction of the belt portion 3. The window portion 25 is provided so as to transmit visible light from the upper surface side to the lower surface side of the band portion 3 through the transmission layer 5. The window portions 25 are formed, for example, so as to have a long-hole-shaped peripheral portion when viewed from above, and are arranged in the longitudinal direction of the band portion 3 at a predetermined interval. On the lower surface side of each window portion 25, for example, a detection paper (an example of an indicator portion) 30 including an acid-base indicator or the like is disposed.

  FIG. 2 is a bottom view of the leakage inspection instrument 1.

  Referring to the figure, a rubber magnet layer (an example of a holding means, an example of a permanent magnet portion) 7 is provided on the lower surface of the belt portion 3. The rubber magnet layer 7 is a bonded magnet having flexibility. The rubber magnet layer 7 is disposed so as to overlap with the entire lower surface of the transmissive layer 5 except for a portion where the window portion 25 is present so as to form a layer with the transmissive layer 5. That is, the rubber magnet layer 7 constitutes a base material layer of the band portion 3. The band 3 has a multilayer structure of a transmission layer 5 and a rubber magnet layer 7.

  3 is a cross-sectional view taken along line AA in FIG.

  Referring to the drawing, the thickness of rubber magnet layer 7 is slightly smaller than the thickness of transmission layer 5. The rubber magnet layer 7 is not transparent. The window portion 25 is a portion where only the transmission layer 5 is present in the two layers constituting the band portion 3. In the window portion 25 portion, the rubber magnet layer 7 is hollowed out to form a space 25a. In other words, the window portion 25 is provided in the belt portion 3 by removing a part of the rubber magnet layer 7 leaving the other portion of the rubber magnet layer 7 as shown in the figure. Since the window portion 25 is transparent, the operator can see the state of the lower surface side from the upper surface side of the belt portion 3 through the window portion 25.

  The holding band 11 is attached to one side of the band portion 3 so as not to cover the window portion 25 in a top view. In addition, referring to FIG. 1, rivets 13 are provided at two locations on the belt portion 3. The rivet 13 is arranged so as to penetrate both the holding band 11 and the band part 3 and caulk the holding band 11 and the band part 3. The rivet 13 has a position in the longitudinal direction corresponding to an intermediate portion between the window portions 25 in the band portion 3 so that the strength of the band portion 3 is not significantly impaired, and the width direction is closer to the side end portion of the band portion 3. It is provided at the position.

  Here, the detection paper 30 is, for example, a litmus test paper. The detection paper 30 is affixed to the lower surface of the window portion 25 using an adhesive member such as a transparent glue that is not so strong in adhesive force, and is located in the space 25a. The detection paper 30 is not limited to this, and for example, a paper impregnated with an indicator that changes color when touching the fluid flowing through the transport pipe may be used. Further, as the detection paper 30, a pattern or the like printed using ink that melts or discolors when touching the fluid flowing in the transport pipe to be inspected using the leakage inspection instrument 1 is used. May be. That is, as the detection paper 30, various types of paper having such a property that a change in appearance appears by contacting the fluid flowing through the transport pipe according to the transport pipe to be inspected can be used.

  Moreover, it is desirable that the material of each part such as the band part 3 and the holding band 11 of the leakage inspection instrument 1 is chemically resistant to, for example, the fluid flowing in the transportation pipe to be inspected. Thereby, even if fluid leakage occurs at the time of inspection, the leakage inspection instrument 1 is not attacked by the fluid, and the leakage inspection instrument 1 can reliably exhibit its function.

  FIG. 4 is a perspective view showing a method for using the leakage inspection instrument 1. FIG. 5 is a perspective view showing the leakage inspection instrument 1 attached to the flange joint portion 50.

  Referring to FIG. 4, leakage inspection instrument 1 is used by being attached to, for example, an iron flange joint portion 50 (an example of a pipe joint portion). The flange joint portion 50 to which the leakage inspection instrument 1 is attached is joined by using bolts 55 by sandwiching iron flanges 53 provided at the ends of the iron transport pipe 51 with packing (not shown) between them. It has a structure.

  The method of attaching the leakage inspection instrument 1 to the flange joint portion 50 is as follows. That is, first, as shown by arrows X and Y in FIG. 4, the band portion 3 is brought into close contact with the side peripheral surface of the flange joint portion 50 from the rubber magnet layer 7 side on the lower surface (first procedure). After the belt portion 3 is wound around the flange joint portion 50 by the first procedure, the holding band 11 is then wound around the flange joint portion 50 from the upper surface side of the belt portion 3 and the buckles 15a and 15b are coupled (second procedure). . Thereby, as shown in FIG. 5, the leakage inspection instrument 1 can be attached to the flange joint portion 50.

  In the present embodiment, since the material of the flange 53 is iron, that is, a ferromagnetic material, and the rubber magnet layer 7 of the band portion 3 is a permanent magnet, in the first procedure, the band portion 3 is removed by the magnetic attraction force. It can be easily held while being wound around the side surface of the flange 53. Therefore, the band part 3 can be positioned on the flange joint part 50, and the second procedure can be easily performed. At this time, if the length of the band portion 3 is longer than the circumferential length of the flange 53, a long portion from one end of the band portion 3 may be overlapped with the upper portion of the band portion 3. In the second procedure, the length of the holding band 11 can be adjusted by the adjuster 17 so that the band portion 3 is firmly held by the flange joint portion 50 by the holding band 11. Further, since the holding band 11 is a rubber band, the length of the holding band 11 is adjusted so that the holding band 11 is slightly extended from the natural length when the holding band 11 is attached to the flange joint portion 50. Thus, the band portion 3 can be more reliably held on the flange joint portion 50.

  For example, the leakage inspection is performed by flowing a fluid in the transport pipe in a state where the leakage inspection instrument 1 is attached to the flange joint portion 50 as described above, and the operator visually confirms the state of the flange joint portion 50. Can do. For example, a case is assumed in which fluid leakage occurs from a portion to which the leakage inspection instrument 1 is attached, such as the flange joint portion 50, at the time of leakage inspection. In this case, when the leaked fluid touches the detection paper 30 disposed in any of the windows 25, the appearance of the detection paper 30 changes, for example, the detection paper 30 changes color. The operator can know that fluid leakage has occurred at the flange joint portion 50 by confirming that the appearance of the detection paper 30 has changed through the window portion 25.

  At this time, the leaked fluid is blocked by the inner surface of the belt portion 3 even if the fluid leaking force is strong. When the leaked fluid is a liquid, even if the fluid falls within the space 25a on the lower surface side of the window portion 25 or overflows from the belt portion 3, the fluid drops down from the flange joint portion 50. Therefore, by using this leakage inspection instrument 1, it is possible to prevent the leaked fluid from widely scattering around the flange joint portion 50. Even if the leaked fluid is a gas, the fluid is less likely to spread in the radial direction of the flange joint portion 50 as compared with the case where the leakage inspection instrument 1 is not used, so that the fluid diffuses around the flange joint portion 50. Speed can be slightly reduced. Therefore, by using the leakage inspection instrument 1, it becomes difficult for an operator to be exposed to the fluid flowing through the transport pipe, and the leakage inspection can be performed easily and more safely.

  Further, as shown in FIG. 5, in a state where the leakage inspection instrument 1 is attached to the flange joint portion 50, the side circumferential surface of the flange 53 is only covered with the leakage inspection instrument 1, so that the bolt 55 is exposed to the outside. Can be kept. Accordingly, the bolt 55 can be easily tightened or loosened using various tools such as an impact wrench and a spectacle wrench while the leakage inspection instrument 1 is attached. By using this leakage inspection instrument 1, it is possible to perform the leakage inspection more safely while ensuring sufficient workability without impairing the work efficiency during the leakage inspection.

  Moreover, the leakage inspection instrument 1 can be easily attached to the flange joint portion 50 as described above, and can be easily detached. Since the leakage inspection instrument 1 is attached to the flange joint part 50 by magnetic attraction force, the belt part 3 can be easily peeled off from the flange joint part 50 by removing the buckles 15a and 15b. In addition, the leakage inspection instrument 1 can be attached and removed any number of times and used repeatedly. Therefore, the cost of using the leakage inspection instrument 1 at the time of leakage inspection is cheap. In the case where the leakage inspection instrument 1 is repeatedly used and a fluid leak has occurred during the leakage inspection already performed and the appearance of the detection paper 30 has changed, only the detection paper 30 changes its appearance. You can replace it with something that is not. Thereby, at the time of the next leak inspection, it is possible to make it easy for the operator to know the occurrence of the leak as before.

  Note that the leakage inspection instrument 1 may be used by being attached to the flange joint portion 50 only by the magnetic attraction force of the belt portion 3. In other words, the leakage inspection instrument 1 does not necessarily need to be used by connecting the buckles 15a and 15b. That is, for example, when the pressure of the fluid flowing in the transport pipe is not so high, even if a leak occurs, it seems easier to attach by using only the magnetic attraction force if it seems that the force of the leaking fluid is not strong. Leakage inspection can be performed.

  In this embodiment, the leakage inspection instrument 1 can also be used for leakage inspection of a flange joint portion using a material that is not a ferromagnetic material, such as a synthetic resin such as stainless steel, aluminum, or vinyl chloride. . In this case, the leakage inspection instrument 1 can be attached to the flange joint portion by winding the holding band 11 from the upper surface side and connecting the buckles 15a and 15b with the belt portion 3 wound around the flange joint portion. . Thus, the leakage inspection instrument 1 can be used by being attached to flange joint portions of various materials at the time of leakage inspection.

  [Second Embodiment]

  The leakage inspection instrument in the second embodiment is different from the first embodiment in that it does not have a holding band and is attached to the flange joint by means other than the holding band and the permanent magnet. Hereinafter, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and description thereof is omitted.

  FIG. 6 is a plan view of a leakage inspection instrument 101 according to the second embodiment of the present invention.

  Referring to the drawing, a leakage inspection instrument 101 is attached to a band part 103, two first surface fastener parts (an example of holding means) 111 attached to the upper surface of the band part 103, and the lower surface of the band part 103. And two second surface fastener portions (an example of holding means) 113.

  7 is a cross-sectional view taken along line BB in FIG.

  Referring to the figure, the band 103 has a two-layer structure of a transmissive layer 5 and a base material layer 107 provided on the lower surface of the transmissive layer 5. The base material layer 107 is made of a flexible resin, for example. The belt portion 103 is provided with a window portion 25 and a space 25a below the same window portion 25 as in the first embodiment.

  The first surface fastener portion 111 and the second surface fastener portion 113 can be engaged with each other. The first surface fastener portion 111 is affixed to the vicinity of one end portion of the band portion 103 so that the distance between the first surface fastener portion 111 and the window portion 25 is as small as possible. Further, the second surface fastener portion 113 is affixed to the vicinity of the end portion of the belt portion 103 opposite to the side where the first surface fastener portion 111 is provided, in the same manner as the first surface fastener portion 111. ing.

  In addition, as the 1st surface fastener part 111 and the 2nd surface fastener part 113, it is preferable to use what was shape | molded, for example using the resin etc. which have transparency. In this case, even when the first surface fastener portion 111 and the second surface fastener portion 113 have to be arranged so that a part of the window portion 25 is covered, the operator can pass through the window portion 25. The occurrence of fluid leakage can be easily confirmed.

  In the second embodiment, in order to attach the leakage inspection instrument 101 to the flange joint 50 at the time of leakage inspection, the following may be performed. First, the belt 103 is wound around the flange joint portion 50 from the side where the first surface fastener portion 111 is provided. Then, at least one of the two second surface fastener portions 113 is engaged with at least one of the two first surface fastener portions 111 so that the belt portion 103 covers the outer peripheral surface of the flange 53. Let Thereby, the leak test | inspection instrument 101 can be easily attached to the flange joint part 50. FIG. Therefore, the operator can perform the leakage inspection easily and more safely using the leakage inspection instrument 101 as in the first embodiment. Since the leakage inspection instrument 101 is simply configured by the band portion 103, the first surface fastener portion 111, and the second surface fastener portion 113, the manufacturing cost can be further reduced.

  Note that the leakage inspection instrument 101 does not have the detection paper 30 unlike the leakage inspection instrument 1 of the above-described first embodiment. That is, as shown in FIG. 7, nothing is arranged in the space 25a. Therefore, in a state where the leakage inspection instrument 101 is attached to the flange joint portion 50, the operator can see the flange joint portion 50 from the window portion 25. Even in such a case, if a leak occurs during the leak test, it can be easily confirmed that the fluid is present in the window 25, so the leak test is easily performed. be able to.

  In addition, the attachment position of a surface fastener part is not restricted above. Hereinafter, as an example, the structure of the leakage inspection instrument 201 in which the attachment position of the hook and loop fastener portion is different from that of the leakage inspection instrument 101 will be described.

  FIG. 8 is a plan view of a leakage inspection instrument 201 according to a variation of the second embodiment. FIG. 9 is a cross-sectional view taken along the line CC of FIG.

  With reference to FIG. 8, the leakage inspection instrument 201 has the same band portion 103 as the leakage inspection instrument 101. The leakage inspection instrument 201 includes a first surface fastener portion (an example of a holding unit) 211 attached to the upper surface of the belt portion 103 and a second surface fastener portion (an example of a holding device) attached to the lower surface of the belt portion 103. ) 213.

  Referring to FIG. 9, first surface fastener portion 211 and second surface fastener portion 213 are attached to one end portion side of band portion 103 so as not to cover window portion 25 in a top view and a bottom view. . In this modified example, the first surface fastener portion 211 and the second surface fastener portion 213 are disposed over substantially the entire length of the belt portion 103 as shown in FIG. That is, in the present embodiment, it can be said that the belt portion 103, the first surface fastener portion 211, and the second surface fastener portion 213 together constitute a belt portion having a four-layer structure.

  The leak test instrument 201 can also be used by being attached to the flange joint portion 50 in substantially the same manner as the leak test instrument 101 described above. Since the first surface fastener portion 211 and the second surface fastener portion 213 of the leakage inspection instrument 201 are disposed over substantially the entire length in the longitudinal direction of the band portion 103, the length of the outer peripheral surface of one leakage inspection instrument 201 is reduced. It can be used for leak inspection of flange joint portions 50 of various sizes smaller than the length of the leak inspection instrument 201. Therefore, it is not necessary to prepare several types of leakage inspection instruments having different lengths for each size of the flange joint portion 50, and only one type of leakage inspection instrument 201 needs to be prepared. The manufacturing cost can be reduced. In addition, since it is not necessary to use various types of leakage inspection instruments depending on the size of the flange joint portion 50, the work efficiency at the time of leakage inspection can be improved and leakage inspection can be performed more easily.

  In the leakage inspection instrument 201, the first surface fastener portion 211 or the second surface fastener portion 213 may be disposed only in part. Even in this case, the leakage inspection instrument 201 can be attached to the flange joint portion 50 having various sizes as described above.

  [Third Embodiment]

  FIG. 10 is a perspective view of a leakage inspection instrument 301 according to the third embodiment of the present invention.

  The leakage inspection instrument 301 in the third embodiment has a two-layered band 3 having a window portion 25 in the same manner as the band 3 of the leakage inspection instrument 1 of the first embodiment. . The leakage inspection instrument 301 is obtained by winding the belt portion 3 in a roll shape.

  For example, the leakage inspection instrument 301 is cut and used as an individual leakage inspection instrument 301a by being appropriately cut by the operator who performs the leakage inspection so that the band portion 3 has a desired length. Therefore, according to the size of the flange joint part 50 used in the facility for performing the leakage inspection, the leakage inspection instrument 301a having an appropriate length can be easily created at the site where the leakage inspection is performed. Work efficiency can be improved.

  In addition, a hook-and-loop fastener part etc. may be arrange | positioned at the leak test | inspection instrument 301. FIG. At this time, the surface fastener portion is provided over substantially the entire length in the longitudinal direction of the belt portion 3 in the same manner as the above-described leakage inspection device 201, so that the surface fastener portion can be surely provided regardless of the length of the belt portion 3 of the leakage inspection device 301a. The leakage inspection instrument 301a can be wound around the flange joint part 50 by engaging each other.

  Further, the detection paper 30 may or may not be disposed in the space 25a below the window 25 of the leakage inspection instrument 301. When using the leakage inspection instrument 301 in a state where the detection paper 30 is disposed, it is not necessary to dispose or replace the detection paper 30 in the space 25a, so that the leakage inspection using the leakage inspection instrument 301 can be performed more easily. Can do.

  [Effects of the embodiment]

  Even if the fluid leaking force is strong, it is possible to check the leakage through the window by wrapping the leakage inspection instrument configured as described above around the side surface of the flange joint and performing the leakage inspection. Can be prevented. Further, even when the leakage inspection instrument is attached to the flange joint portion, the bolt portion of the flange joint portion can be exposed to the outside. Therefore, the leakage inspection can be performed more easily and safely.

  In addition, since the leakage inspection instrument has at least one of a permanent magnet part (rubber magnet layer), a hook-and-loop fastener part, and a holding band as a holding means, the leakage inspection instrument can be attached to and detached from the flange joint part. It can be done easily. Therefore, the leak inspection can be performed more easily.

  In addition, the leakage inspection instrument has a relatively simple structure using a band portion having a multilayer structure, and is reusable. Therefore, the leakage inspection instrument is low in manufacturing cost, and can be used at a low cost, particularly when used as a leakage inspection instrument used only during leakage inspection.

  [Others]

  In addition, the number and shape of a window part are not restricted above, For example, only one window part may be provided in one belt | band | zone part. Moreover, the window part may be formed by the width direction center part of the base material layer being continuously removed by predetermined width. Further, the transmissive layer may be translucent, or the surface on the lower surface side of the window portion may be roughened to make the transmissive layer translucent, and when the liquid adheres, the portion may appear transparent. In this case, it can be said that the indicator part which an external appearance changes is provided when a fluid contacts the window part part of a permeation | transmission layer.

  In addition, as a holding means for holding the leakage inspection instrument while being wound around the flange joint portion, a permanent magnet portion or a combination of a permanent magnet portion and a ferromagnetic material is provided in a predetermined portion of the belt portion, and leakage is caused by magnetic adsorption force. The inspection instrument may be easily attachable to the flange joint. Moreover, you may provide a permanent magnet part only in some band parts, such as the both ends of a band part, as a holding means. In this case, the leakage inspection instrument can be easily attached to the flange joint portion by adhering the permanent magnet portion to the flange joint portion of the ferromagnetic material.

  Moreover, the space does not need to be provided on the lower surface side of the window portion. In addition, instead of the detection paper, an indicator portion may be provided on the lower surface side of the window portion so that the appearance changes due to melting or discoloration by touching the fluid. For example, a predetermined pattern or the like is printed on the lower surface of the window as an indicator part, and when the liquid leaks, the pattern can be blotted so that the operator can easily detect the leak. Good.

  Further, the belt portion is not limited to a two-layer structure of a base material layer such as a rubber magnet layer and a transmission layer, and may have a multilayer structure composed of more layers. Further, the band portion has a band-shaped metal processed to such an extent that an operator can bend along the outer peripheral surface of the flange as the base material layer, and the base material is configured to constitute the window portion as the transmission layer. You may have a transparent member, such as heat-resistant glass distribute | arranged so that a part may overlap with a layer. By configuring each part using such a material that can withstand relatively high temperatures, even if a leakage of a relatively high temperature fluid occurs, the leakage inspection instrument 1 is not damaged, and leakage inspection is performed. The instrument 1 can reliably exhibit its function.

  Moreover, you may comprise a leak test | inspection instrument combining each part of the above-mentioned 1st to 3rd embodiment. For example, the detection paper may not be used in the leakage inspection instrument of the first embodiment. Further, in the leakage inspection instrument of the second embodiment, a belt portion having a rubber magnet layer may be used as in the first embodiment. In this case, the leakage inspection can be more easily performed using both or one of the two means of the magnetic attraction force by the rubber magnet layer and the engagement of the set of surface fastener portions.

  Moreover, as a pipe joint which can use a leak test | inspection instrument, it is not necessarily restricted to a flange joint. Leakage inspection instruments can be used for the joint portions of various pipe joints, thereby enabling easier and safer leak inspection.

  In addition, it should be thought that the said embodiment is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1, 101, 201, 301, 301a Leakage inspection instrument 3,103 Band portion 5 Transmission layer 7 Rubber magnet layer (an example of a base layer, an example of a permanent magnet portion, an example of a holding means)
11 Holding band (an example of holding means)
25 Window part 30 Detection paper (an example of an indicator part)
50 Flange joint (example of pipe joint)
51 Transport pipe 107 Base material layer 111, 113, 211, 213 Surface fastener part (an example of a holding means)

Claims (5)

A leakage inspection instrument used by being wrapped around a pipe joint of a transport pipe for transporting a fluid,
A strip-shaped strip,
A holding means that is provided in the band portion and holds the band portion in a state of being wound around the pipe joint portion;
A window provided in at least a part of the band part so as to transmit visible light from the upper surface side of the band part to the lower surface side of the band part;
The band portion has a structure including at least two layers of a transmission layer constituting the window portion and a base material layer at least partially overlapping the transmission layer in a top view,
The said window part is a leak test | inspection instrument provided in the said belt | band | zone part because a part of said base material layer is removed leaving the other part of the said base material layer.   The leakage inspection instrument according to claim 1, wherein the holding means includes at least a permanent magnet portion that is attracted to a pipe joint portion that is a ferromagnetic body by a magnetic attraction force.   The leakage inspection instrument according to claim 2, wherein the permanent magnet portion is a flexible bonded magnet and forms the base material layer.   As the holding means, at least the surface fastener portion disposed on the upper surface and the lower surface of the band portion and engaging with each other, and disposed on the upper surface of the band portion along the band portion, the pipe from the upper surface side of the band portion The leakage inspection instrument according to any one of claims 1 to 3, comprising any one of a holding band wound around the joint portion.   The leakage inspection instrument according to any one of claims 1 to 4, further comprising an indicator part that is provided on a lower surface side of the window part and changes its appearance by contacting the fluid.

Images