JP2007113766A - Piping connection structure for membrane treating device, and packing for flange - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a membrane treating device capable of easily specifying a troubled membrane module and to provide a packing for flanges allowing a passage of flange-connected piping to be switched to a communicating state and a cut-off state with simple work. <P>SOLUTION: The packing 21 for the flanges movable to a communicating part 23 with a communicating hole 22, and a cut-off part 24 with no communicating hole is used for a flange connection part to a connecting pipe on the membrane module side and the liquid feed pipe side. The packing for the flanges is formed with elongate holes 29, 29 in portions through which two guide bolts in diagonal positions out of four bolts 16 are inserted, and in a state of loosening the guide bolts and removing two other fixing bolts out of four bolts 16, the guide bolts are relatively moved from one ends to the other ends of the elongate holes. Either one of the communicating part and the cut-off part can thereby be disposed between the flanges. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pipe connection structure of a membrane treatment apparatus and a flange packing, and more specifically, a structure of a flange joint portion of a pipe in an immersion type membrane treatment apparatus that performs solid-liquid separation using a plurality of membrane modules, and The present invention relates to a flange packing that is mounted between flanges in order to prevent leakage from a joint portion when pipes are flanged.

As a solid-liquid separation means in water treatment or the like, an immersion type membrane treatment apparatus is used. In general, this membrane processing apparatus uses a membrane unit that uses a large number of membrane modules, and collects a number of membrane modules in a plurality of connecting pipes, a plurality of connecting pipes in a header, and a header. The membrane filtrate is sent to the downstream side by gathering in one liquid feed pipe. In such a membrane treatment apparatus, if one of the membrane elements constituting the membrane module has a failure such as a rupture, the liquid quality of the membrane filtrate deteriorates. Various techniques for detection have been proposed (see, for example, Patent Document 1).
JP 2002-79065 A

  In the membrane treatment apparatus as described above, when it is detected that the membrane unit is broken, it is necessary to identify the membrane module in which the fracture has occurred and replace the membrane module. To identify the membrane module where a failure such as breakage occurred, air pressure is applied to the membrane unit from the liquid feed pipe side, and the occurrence state of bubbles leaking in the treatment tank is investigated, and the location of the membrane module where the failure occurs is predicted. Then, pull up the membrane unit from the inside of the treatment tank, remove the membrane module that seems to be applicable from the connection pipe, fix the water stop plate to the flange of the connection pipe, and shut off the flow path of the connection pipe again. The membrane unit was immersed in the inside to confirm the generation state of bubbles.

  Therefore, in order to identify the membrane module in which the failure has occurred, there is a problem that it takes a long time to release the flange connection and fix the flow path of the connecting pipe with the water stop plate. In order to save this trouble, it is conceivable to provide a valve between each membrane module and the connecting pipe, but it is a valve that is not normally used at all, which increases the manufacturing cost of the membrane unit and enlarges the membrane unit, Furthermore, since the lifting device for lifting the membrane unit is increased by increasing the weight of the membrane unit, it is inevitable that the membrane processing apparatus as a whole will be significantly increased in cost. It will be.

  On the other hand, as a means of joining pipes or pipe parts of pipes and valves, and pipes and end parts of various equipment, flanges formed on the outer periphery of the pipe end with flange packing sandwiched between them Flange connection that is fastened by a plurality of bolts and nuts is often used. The flange packing that is normally used is provided with a communication hole for communicating the pipe flow path at the center thereof, and a plurality of bolt insertion holes are provided at equal intervals on the outer periphery of the communication hole. It has a shape that prevents leakage while ensuring.

  Therefore, in order to remove the membrane module from the connecting pipe and fix the water stop plate to the flange of the connecting pipe in the above-mentioned membrane separation apparatus, all bolts that fasten the flange are pulled out of the flange, and a separately prepared stop is provided. The operation of attaching the water plate and tightening all the bolts again is necessary, and the predetermined water stop plate must be prepared in advance. The trouble of tightening and fixing the bolts of this was a great deal.

  Therefore, the present invention provides a membrane treatment apparatus that can easily identify a membrane module in which a failure such as a breakage has occurred without using a valve and without removing all bolts from the flange, An object of the present invention is to provide a flange packing capable of switching between a communication state and a cutoff state of a flow path of a pipe to be flange-coupled by a simple operation.

  In order to achieve the above object, the membrane treatment apparatus of the present invention is a membrane treatment apparatus comprising a membrane unit that collects and feeds the membrane filtrates of a plurality of membrane modules provided in parallel in one liquid feed pipe. The membrane module side pipe and the liquid supply pipe side pipe are joined by a flange joint fastened by a plurality of bolts, and when the flange joint is installed between the flanges as a flange packing, A communication part having a communication hole for communicating the road and a blocking part for blocking the pipe flow path when mounted between the flanges are provided, and at least two of the plurality of bolts are used as guide bolts. By removing a bolt other than the guide bolt and moving it along the flange surface with the guide bolt loosened, either the communication part or the blocking part Write is characterized by using the disposed possible and the packing flange between flanges.

  The flange packing of the present invention is disposed between flanges in a flange packing attached to a flange joint portion of a pipe that is fastened by inserting four bolts arranged at the apex of a square. A communication portion having a communication hole for communicating a pipe flow path when the four bolts are mounted between the flanges on the packing body, and a pipe flow path when the four bolts are mounted between the flanges. The part where the two guide bolts are inserted with the two bolts at the diagonal positions of the four bolts as guide bolts and the other two bolts as fixing bolts. A long hole is formed in the packing body so that the packing body can be moved along the flange surface to the communication portion and the blocking portion in a state where the guide bolt is inserted, and the two fixing bolts are packed. Pull out the guide bolts inserted into the long holes from one end of each long hole in a state where the two guide bolts are loosened and the packing main body is movable along the flange surface between the flanges. One of the communication part and the blocking part can be disposed between the flanges by relatively moving to the end.

  Furthermore, the flange packing of the present invention is a flange packing attached to a flange coupling portion of a pipe that is fastened by inserting four or more bolts, and the packing main body disposed between the flanges, A communication part having a communication hole for communicating the pipe flow path when mounted between the flanges with a plurality of bolts and a blocking part for blocking the pipe flow path when mounted between the flanges with the plurality of bolts are provided. The at least two bolts of the plurality of bolts are used as guide bolts, and the packing main body in a state where the guide bolts are inserted into the packing main body at which at least one of the guide bolts is inserted. A long hole that is movable along the flange surface to the communication part and the blocking part is formed, and bolts other than the guide bolts in the plurality of bolts are packed. The guide is inserted into the elongated hole while the packing body is guided by the guide bolt in a state in which the packing body can be moved along the flange surface between the flanges by loosening the guide bolt. One of the communication part and the blocking part can be disposed between the flanges by relatively moving the bolt along the long hole.

  According to the membrane treatment apparatus of the present invention, the flow path of the connecting pipe when the membrane module in which the failure has occurred can be shut off simply by moving the flange packing, and a water stop plate is separately prepared. This eliminates the need to remove all bolts from the flange, improving workability when identifying a faulty membrane module and enabling the faulty membrane module to be identified in a short time. . Further, the membrane unit can be reduced in size and cost as compared with the case where a valve is provided.

  Further, according to the flange packing of the present invention, the pipe body can be easily switched between the communication state and the cutoff state by moving the packing body with the guide bolts loosened and other bolts removed. . Therefore, a valve in the middle of piping that is not normally used can be omitted, and the piping system can be made compact and the cost can be reduced.

  1 to 9 show the first embodiment of the membrane treatment apparatus and flange packing of the present invention. FIG. 1 is a front view of a membrane unit in the membrane treatment apparatus, FIG. 2 is a side view, and FIG. Is a front view of the flange packing, FIG. 4 is a sectional side view, FIG. 5 is a sectional side view showing a state where the pipe flow passage is communicated, FIG. 6 is a sectional front view, FIG. FIG. 9 is a sectional side view showing a state where the pipe flow path is blocked, and FIG. 9 is a sectional front view.

  First, as shown in FIG. 1 and FIG. 2, the membrane unit 11 shown in this embodiment has a total of 25 membrane modules 12 in which five rows in the vertical direction and five rows in the horizontal direction are arranged. The ends of each of the five membrane modules 12 arranged in the vertical direction are connected and assembled to the connecting pipes 13 arranged on the both sides of the membrane module 12, and the upper ends of the connecting pipes 13 are connected to the two ends. The headers 14 are connected and assembled to each other, and a liquid feed pipe (not shown) is connected to both the headers 14. The membrane unit 11 is immersed in the liquid in the treatment tank, and the treatment liquid that has passed through each membrane element of the membrane module 12 gathers from the connecting pipe 13 to the header 14 and is sent to the next process or the like through the liquid feed pipe. To be liquidated.

  In such a membrane unit 11, for connection between the end of each membrane module 12 and the connecting pipe 13, for example, as shown in FIGS. 5 and 8, flanges 15, 15 formed on the outer periphery of both ends are connected to each other. In this state, a flange connection is used in which the flange packing 21 is clamped by four bolts 16 and nuts 17. As shown in FIGS. 5 to 9, the flange 15 has four bolt mounting holes 19 concentrically with respect to the pipe flow path 18 on the outer periphery of the pipe flow path 18 at equal intervals of 90 degrees. It is provided so that it may be arranged at a position.

  As shown in FIGS. 3 and 4, the flange packing 21 has a communication hole 22 that allows the membrane module 12 and the connection pipe 13 to communicate with each other when connected between the flanges 15 and 15. The communication portion 23 and a blocking portion 24 that blocks the pipe flow path 18 when mounted between the flanges 15 and 15 are provided side by side, and two bolts of the four bolts are used as guide bolts, Using a flange packing that allows any one of the communication part 23 and the blocking part 24 to be disposed between the flanges 15 and 15 in a state where the bolts (fixing bolts) other than the guide bolts are extracted and the guide bolts are loosened. Yes.

  The packing body 25 of the flange packing 21 is formed in an oval shape in which circular portions having a diameter corresponding to the diameter of the outer peripheral edge 15a of the flange are connected to each other. Three circular bolt insertion holes 26, 27, and 28 are provided at equal intervals at intervals corresponding to the intervals between the pair of bolt mounting holes 19 at the corner positions. Between the bolt insertion hole 26 adjacent to one of the central bolt insertion holes 27 (upward in FIG. 3), the communication portion 23 is provided with the communication hole 22 corresponding to the position and the diameter of the pipe flow path 18. The blocking portion 24 having no communication hole is formed between the bolt insertion hole 28 adjacent to the other (downward in FIG. 3) of the central bolt insertion hole 27.

  Further, the both sides of the packing body 25 with the long axis line symmetrical with each other are spaced at intervals corresponding to the distance between the pair of bolt mounting holes 19 at the diagonal positions and between the bolt mounting holes 19 at the diagonal positions. A pair of long holes 29 having lengths corresponding to the intervals are provided. In addition, the space | interval of each part here is based on the volt | bolt center.

  As shown in FIGS. 5 to 7, the flange packing 11 formed in this manner is arranged at a position corresponding to the flange 15 as shown in FIGS. And the bolt insertion holes 26 and 27 surrounding the communication hole 22 and one end (upper side in FIGS. 3 and 6) 29a of the elongated hole 29 are made to correspond to the bolt mounting holes 19 of the flange 15. The bolts 16 are inserted from the bolt mounting holes 19 on one flange side through the bolt insertion holes 26 and 27 of the packing body 25 and the one end 29a of the long hole 29 toward the bolt mounting holes 19 on the other flange side, Both flanges 15 and 15 are fastened by screwing the nut 17.

  In this state, similarly to the case where a normal flange packing is used, the pipe flow paths 18 on both sides are in communication with each other via the communication hole 22 of the flange packing 21, and the packing body 25 around the communication hole 22. As a result, leakage from the flange coupling portion is prevented.

  On the other hand, when blocking the pipe flow path 18, as shown in FIGS. 8 and 9, the blocking portion 24 is disposed at a position corresponding to the flange 15, and the communication hole 22 is positioned outside the flange 15. In this state, the bolt insertion holes 27 and 28 and the other end (lower in FIG. 3 and FIG. 6) 29b of the long hole 29 are made to correspond to the bolt mounting holes 19 of the flange 15, respectively. The bolt 16 is inserted from the mounting hole 19 toward the bolt mounting holes 19 on the other flange side through the bolt insertion holes 27 and 28 of the packing body 25 and the other end 29b of the long hole 29, and the nut 17 is screwed. The flanges 15 and 15 are fastened together. In this state, the blocking portion 24 is positioned between the pipe flow paths 18 on both sides, and the piping flow path 18 is blocked by the packing body 25 and leakage from the flange portion is also prevented.

  Switching from the communication state shown in FIGS. 5 to 7 to the blocking state shown in FIGS. 8 and 9 can be performed as follows. First, in the state shown in FIGS. 5 to 7, the two bolts 16 inserted into the bolt insertion holes 26 and 27 of the packing body 25 were removed, and the two bolts 16 inserted into the one end 29 a of the long hole 29 were loosened. State. In this state, the space between the flanges 15 and 15 is slightly opened so that the packing body 25 can move between the flanges 15 along the flange surface. Next, the packing body 25 is moved so that the blocking portion 24 of the packing body 25 is positioned between the flanges 15. At this time, the packing body 25 moves while being guided by the bolts 16 that are still inserted through the long holes 29, and moves the bolts 16 from the one end 29 a to the other end 29 b along the long holes 29. By relatively moving, the bolts 16 and the other end 29b are positioned in a predetermined state, and the bolt insertion holes 27 and 28 correspond to the bolt mounting holes 19 of the flange 15, respectively.

  Finally, the extracted two bolts 16 are inserted into the bolt insertion holes 27 and 28, and all the bolts 16 are tightened with the nuts 17. As a result, the pipe flow path 18 is switched from the communication state to the cutoff state. Note that the switching from the shut-off state to the communication state is similarly performed by removing the two bolts and moving the packing body 25 to the communication portion 23 side with the two bolts loosened, and then tightening all the bolts. Can be done.

  At the time of this switching, the pair of bolts 16 and 16 inserted into the long hole 29 out of two sets of two bolts at the diagonal positions of the square are the packing body along the long holes 29 and 29. 25 is moved in a predetermined direction, and functions as a guide bolt for restricting the movement amount to a predetermined distance, and another set of two bolts inserted into the bolt insertion holes 26, 27, and 28 formed of circular holes. 16 and 16 function as fixing bolts for preventing the packing body 25 from moving with respect to the flange 15.

  In the above-described membrane treatment apparatus, when identifying a membrane module in which a failure has occurred, compressed air is introduced into the membrane module 12 from the liquid feeding pipe in a state where the membrane unit 11 is immersed in the treatment tank, After investigating the state of occurrence of bubbles from the module 12 and predicting the position of the membrane module where the failure has occurred, the membrane unit 11 is pulled up from the treatment tank, and the flange connection between the membrane module 12 and the connecting pipe 13 that seems to be applicable The flange packing 21 provided in the part is moved in the above-described procedure to be in a shut-off state.

  And it immerses in a processing tank again and introduces compressed air, and the generation | occurrence | production state of the bubble from each membrane module 12 is investigated. If no bubbles are generated at this time, it can be confirmed that a failure such as a break has occurred in the membrane module 12 in which the flange coupling portion is blocked by the flange packing 21. Further, when bubbles are generated, the position of the membrane module where the failure has occurred is predicted again, and the membrane unit 11 is pulled up from the inside of the processing tank, and is provided at the flange coupling portion between the membrane module 12 and the connecting pipe 13 which seems to be applicable. The flange packing 21 thus moved is moved in the above-described procedure to be in a shut-off state. By performing this as many times as necessary, the membrane module 12 in which the failure has occurred can be specified.

  In this way, by moving the flange packing 21 to shut off the flange coupling portion, it is not necessary to prepare a separate water stop plate, and only two bolts are required, and the other two are only loosened. Therefore, the working efficiency can be improved as compared with the conventional attachment / detachment of the bolt, and the membrane module 12 in which the failure has occurred can be identified efficiently in a short time.

  Further, as shown in FIG. 2, when installing a large number of membrane modules 12 adjacent to each other in the horizontal direction and the vertical direction, the direction of movement of the flange packing 21 between the communication state and the shut-off state is set to a 45 ° oblique direction. By arrange | positioning so that an adjacent flange may be avoided, the space | interval of membrane modules can be narrowed and size reduction of the whole apparatus can be achieved. In addition, when the flange packing 21 is moved, the distal end side in the moving direction may come into contact with another flange packing 21. There is no problem even if the packings are overlapped.

  FIG. 10 is a front view showing a second embodiment of the flange packing of the present invention. As described above, the flange packing 31 shown in the present embodiment is suitable for a flange in which four bolts are arranged at respective vertex positions of a square, and is a packing body formed in the same oval shape as described above. A pair of elongated holes 32 corresponding to a pair of opposing two sides of a square with each bolt as a vertex are provided in both side portions of each of the two bolts, and two adjacent holes in one elongated hole 32 are provided. The bolt 33 is inserted.

  As shown by the solid line in FIG. 10, the flange packing 31 is applied to one end 32 a of the long hole 32 on the communication part side having the communication hole 34 and one bolt of the two bolts 33 inserted through the long hole 32. When it is placed between the flanges in a contact state, the flange is in a communication state, and the other bolt 32 of the two bolts 33 inserted into the long hole 32 is in contact with the other end 32b of the long hole 32. When placed in between, it becomes a cut-off state.

  Therefore, in this embodiment, all of the four bolts 33 function as guide bolts, and when the flange packing 31 is moved, all the bolts 33 are not loosened and are appropriately loosened, By setting the packing 31 to be movable along the flange surface, it is possible to switch between the communication state and the cutoff state.

  FIG. 11 is a front view showing a third embodiment of the flange packing of the present invention. The flange packing 41 shown in the present embodiment is suitable for a flange in which six bolts 42 and 43 are arranged in a regular hexagonal shape for flange connection, and two bolts 42 at diagonal positions are fixed bolts. The other four bolts 43 are used as guide bolts. Therefore, three bolt insertion holes 44, 45, 46 are provided on the major axis of the flange packing 41 formed in an oval shape as described above at intervals corresponding to the pair of bolts 42 at diagonal positions. In addition, a pair of long holes 47 into which two bolts 43 located adjacent to each of the both side portions can be inserted are provided in both side portions having the long axis line symmetrical.

  In the flange packing 41 formed in this way, switching between the shut-off state of the pipe flow path indicated by the solid line and the communication state indicated by the imaginary line in FIG. 46, loosen the four bolts 43, which are guide bolts, open the space between the flanges so that the flange packing 41 can move along the flange surface, and then is inserted into one elongated hole 47. The flange packing 41 is moved from the state where one of the two bolts 43 is in contact with one end of the long hole 47 to the state where the other of the two bolts 43 is in contact with the other end of the long hole 47. By moving the bolt 42 through the bolt insertion holes 44 and 45 and fastening each bolt, the communication hole 48 is brought into communication with the pipe flow path. , In the same manner as the flange gasket shown in each embodiment can switch between blocking and communication of the pipe passage.

  FIG. 12 is a front view showing a fourth embodiment of the flange packing of the present invention. The flange packing 51 shown in the present embodiment is adapted to a flange in which four bolts are arranged at respective vertex positions of a square, and the flange packing 51 is rotated around one bolt 52. The pipe channel is configured to be switched between communication and blocking.

  The packing body is formed in a substantially semicircular shape centering on a bolt insertion hole 53 for inserting the bolt 52 serving as a center guide bolt, and is located at a diagonal position with respect to the bolt 52 and serves as a guide bolt. An arc-shaped long hole 55 having a radius centered on the bolt 52 is provided in a direction along the outer periphery of the semicircular portion in a portion through which the bolt 54 is inserted, and a circumference around the bolt 52 is formed at an intermediate portion thereof. On the upper side, three bolt insertion holes 57, 58, 59 for inserting two bolts 56, 56 to be fixing bolts are provided at equal intervals at the same interval as the interval between the bolts 56, 56. In one half of the semicircular shape, a communication hole 60 is provided in a state surrounded by one end of the insertion hole 53 of the bolt 52, the insertion holes 57 and 58, and the long hole.

  In order to switch between the communication state of the pipe flow path indicated by the solid line in FIG. 12 and the cutoff state indicated by the imaginary line, the two fixing bolts 56 are removed, the central bolt 52 and the outer peripheral bolt 54 are loosened, and the flange The flange packing 51 is moved so that the flange packing 51 can be rotated along the flange surface, and then the outer peripheral bolt 54 is relatively moved along the arc-shaped elongated hole 55. This can be done by turning.

  The flange packing shown in each embodiment can be formed of any material depending on conditions such as the diameter and tightening force of the piping flow path, for example, various synthetic resins, rubber such as hard rubber, and metal plates It can be formed with a lining such as rubber. Moreover, if the shape of the flange packing can be moved (turned) at the time of switching, it is also possible to provide appropriate irregularities on the packing surface. Furthermore, a knob piece serving as a clue when moving the flange packing can be provided on the outer periphery of the packing body, and the outer periphery of the flange body can be formed larger than the outer periphery of the flange.

  Further, the flange packing of the present invention may be used not only in the flange coupling portion between the membrane module and the connecting pipe in the membrane processing apparatus described above, but also in the flange coupling portion between the connecting pipe and the header. It can also be applied to flange joints in various pipes.

It is a front view which shows one example of the film | membrane unit in the film processing apparatus of this invention. It is a side view similarly. It is a front view which shows the 1st example of a form of the packing for flanges of this invention. It is a sectional side view similarly. It is a cross-sectional side view which shows the state which connected the piping flow path. It is a sectional front view similarly. It is a perspective view similarly. It is a cross-sectional side view which shows the state which interrupted | blocked the piping flow path. It is a sectional front view similarly. It is a front view which shows the 2nd form example of the packing for flanges of this invention. It is a front view which shows the 3rd example of a packing for flanges of this invention. It is a front view which shows the 4th example of a packing for flanges of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Membrane unit, 12 ... Membrane module, 13 ... Connection pipe, 14 ... Header, 15 ... Flange, 15a ... Flange outer periphery, 16 ... Bolt, 17 ... Nut, 18 ... Pipe flow path, 19 ... Bolt mounting hole, 21 ... Flange packing, 22 ... Communication hole, 23 ... Communication part, 24 ... Blocking part, 25 ... Packing body, 26,27,28 ... Bolt insertion hole, 29 ... Long hole, 31 ... Flange packing, 32 ... Long hole , 33 ... Bolt, 34 ... Communication hole, 41 ... Flange packing, 42 ... Bolt (fixing bolt), 43 ... Bolt (guide bolt), 44, 45, 46 ... Bolt insertion hole, 47 ... Long hole, 51 ... Flange Packing 52, bolt (center guide bolt), 53 bolt insertion hole, 54 bolt (guide bolt), 55 long hole, 56 bolt (fixing bolt), 57, 58, 59 ... Belt insertion hole, 60 ... communication hole

Claims (3)

  In a membrane processing apparatus comprising a membrane unit that collects and sends the membrane filtrates of a plurality of membrane modules arranged in parallel in one liquid feeding pipe, the membrane module side piping and the liquid feeding pipe side piping; Between the flange and a flange having a communication hole for communicating a pipe flow path when mounted between the flanges as a flange packing of the flange coupling portion. A blocking portion that blocks the pipe flow path when mounted is used, and at least two bolts of the plurality of bolts are used as guide bolts, bolts other than the guide bolts are extracted, and the guide bolts are loosened. By moving along the flange surface in the state, either the communication part or the blocking part can be disposed between the flanges. Film processing apparatus characterized by using a down.   In the flange packing attached to the flange joint portion of the pipe that is fastened by inserting the four bolts arranged at the square apex positions, the four bolts are attached to the packing body disposed between the flanges. A communication part having a communication hole for communicating the pipe flow path when mounted between the flanges, and a blocking part for blocking the pipe flow path when mounted between the flanges by the four bolts; The two bolts at the diagonal position of the four bolts are guide bolts, the other two bolts are fixing bolts, and the guide bolts are inserted into the packing body where the two guide bolts are inserted. In this state, the packing body is formed with long holes that can be moved along the flange surface to the communication part and the blocking part, and the two fixing bolts are removed from the packing body. By loosening the guide bolts and allowing the packing body to move along the flange surface between the flanges, the guide bolts inserted through the long holes are relatively moved from one end to the other end of the long holes. The flange packing is characterized in that either one of the communication part or the blocking part can be disposed between the flanges.   In a flange packing to be attached to a flange joint portion of a pipe that is fastened by inserting four or more bolts, the flange body is provided between the flanges with the packing body disposed between the flanges. A communication part having a communication hole for communicating the pipe flow path sometimes, and a blocking part for blocking the pipe flow path when mounted between the flanges with the plurality of bolts, at least of the plurality of bolts Two bolts are used as guide bolts, and at least one guide bolt of the guide bolts is inserted into the packing main body in a state where the guide bolts are inserted, the packing main body is disposed along the flange surface and the communication portion. A movable long hole is formed in the blocking portion, and bolts excluding the guide bolts of the plurality of bolts are removed from the packing body, and the guide With the bolts loosened and the packing body movable between the flanges along the flange surface, the guide body is guided by the guide bolts, and the guide bolts inserted through the elongated holes are relatively moved along the elongated holes. The flange packing is characterized in that either one of the communication part or the blocking part can be disposed between the flanges by moving the contact part between the flanges.

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