JP2015132345A - Fluid conduction blocking method of pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid conduction blocking method of a pipe capable of easily, inexpensively and properly blocking conduction of a fluid so that a liquid does not flow to a construction portion-side pipe in executing a construction of a pipe in which a fluid is conducted.SOLUTION: In a method of blocking conduction of a fluid by inserting a partition plate jig to a flange connecting portion of a pipe in which a fluid is conducted, and tightening the same by a bolt with the flange, the partition plate jig includes two sheets of partition plates having bolt holes corresponding to bolt fastening positions of the flange, and a discharge flow channel having a spacer held between two sheets of partition plates to form a clearance between the two sheets of partition plates, and discharging the fluid flowing into the clearance to the outside of the pipe.

Description

  The present invention relates to a method for interrupting fluid conduction in piping.

  When constructing pipes where fluid is conducted inside (for example, fuel gas supply pipes), in order to prevent fluid from flowing into the pipes at the construction site, It is necessary to cut off the fluid conduction between the piping on the construction side) and the piping on the fluid conducting side (fluid conducting side).

  When the fluid is interrupted as described above, generally, the pipe is provided with flange connection portions at a predetermined interval, and the gap between the opposing flanges is closed with a ring-shaped plate. Therefore, a method has been adopted in which a ring-shaped plate is pulled out and a partition plate is inserted at a flange connection portion at a position close to a construction site (for example, see Patent Document 1).

  In some cases, a method of installing a balloon in the pipe or a method of cutting a gate valve into the pipe may be used.

  However, in the above-described method, there is a case where the fluid conduction cannot be sufficiently cut off, and even if a leak occurs in the cut off location, the leaked fluid may flow into the construction side piping. There may be a double shut-off.

  FIG. 5 shows an example in which double blocking is performed as described above.

  Fig.5 (a) is a case where a partition plate is installed in two steps and double interruption | blocking is performed. Between the pipe 4a on the construction work section 21 side and the pipe 4b on the fluid conduction section 22 side, a pipe 4c filled with an inert gas is provided as the buffer section 23, and the flange 1a and the buffer section pipe of the construction work section side pipe 4a are provided. The partition plate 31 is inserted between the flanges 1c of the 4c and fixed with bolts 32 and nuts 33, and the partition plate 34 is inserted between the flange 1d of the buffer portion piping 4c and the flange 1b of the liquid conduction portion side piping 4b. The bolt 35 and the nut 36 are fixed. Thereby, even if the fluid in the fluid conduction part side piping 4b leaks from the partition plate 34, the leaked fluid is blocked by the partition plate 31 and is prevented from flowing into the construction part piping 4a.

  FIG. 5B shows a case where a partition plate and a balloon are installed to perform double blocking. A partition plate 31 is inserted between the flange 1a of the construction work section side pipe 4a and the flange 1b of the fluid conduction section side pipe 4b and fixed with bolts 32 and nuts 33, and a balloon 37 is placed in the fluid conduction section side pipe 4b. Is installed. As a result, even if the fluid in the fluid conducting portion side pipe 4b leaks from the balloon 37, the leaked fluid is blocked by the partition plate 31 and is prevented from flowing into the construction portion side piping 4a.

  Moreover, FIG.5 (c) is a case where a partition plate and a gate valve are installed and double interruption | blocking is performed. The partition plate 31 is inserted between the flange 1a of the construction side pipe 4a and the flange 1b of the fluid conduction part side pipe 4b and fixed with bolts 32 and nuts 33, and the gate valve 38 is provided on the fluid conduction part side pipe 4b. Cut in. Thereby, even if the fluid in the fluid conduction part side pipe 4b leaks from the gate valve 38, the leaked fluid is blocked by the partition plate 31 and is prevented from flowing into the construction part side pipe 4a.

JP 2006-144824 A

  However, as shown in FIG. 5, the method of performing the double shutoff by combining the partition plate, the balloon, and the gate valve reliably shuts off the fluid conduction so that the fluid does not flow into the construction work side piping. Although the possibility increases, there is a problem that it takes time and cost because new installation processing is required at a plurality of locations of the piping.

  The present invention has been made in view of the circumstances as described above, and is simple and inexpensive so that the fluid does not flow into the construction work side piping when the construction of the piping in which the fluid is conducted is performed. It is an object of the present invention to provide a fluid conduction blocking method for piping capable of accurately blocking fluid conduction.

  In order to solve the above problems, the present invention has the following features.

  [1] A method of cutting off fluid conduction by inserting a partition plate jig into a flange connection portion of a pipe through which fluid is conducted and bolting the flange together with the flange, Two partition plates having bolt holes corresponding to the bolting positions of the flanges, and a spacer sandwiched between the two partition plates to form a gap between the two partition plates, and the gap A fluid conduction blocking method for piping, comprising a discharge passage for discharging the fluid flowing into the pipe to the outside of the piping.

  [2] The fluid conduction cutoff method for piping according to [1], wherein the spacer is joined to at least one partition plate.

  [3] The fluid conduction cutoff of the pipe according to [1] or [2], wherein the spacer is provided in the vicinity of the bolt hole for bolting provided in the partition plate. Method.

  [4] The above [1] to [1], wherein the spacer has a ring shape concentric with the partition plate, and has a notch penetrating from the inside to the outside of the ring shape as the discharge channel. 3] The fluid conduction cutoff method for piping according to any one of [3].

  [5] A partition plate jig for inserting the inside into a flange connection portion of a pipe through which fluid is conducted to cut off the fluid conduction, and having a bolt hole corresponding to the bolting position of the flange 2 In order to form a gap between the two partition plates and the two partition plates, the spacer has a spacer sandwiched between the two partition plates, and discharge for discharging the fluid flowing into the gap to the outside of the pipe A partition plate jig comprising a flow path.

  [6] The partition plate jig according to [5], wherein the spacer is joined to at least one partition plate.

  [7] The partition plate jig according to [5] or [6], wherein the spacer is provided in the vicinity of the bolt hole for bolting provided in the partition plate.

  [8] The above [5] to [5], wherein the spacer has a ring shape concentric with the partition plate, and has a notch penetrating from the inside to the outside of the ring shape as the discharge channel. 7] The partition plate jig according to any one of the above.

  In the present invention, when performing construction of a pipe through which fluid is conducted, the fluid conduction can be cut off simply, inexpensively and accurately so that the fluid does not flow into the construction section side pipe.

  That is, in the present invention, the partition plate jig to be inserted into the flange connection portion of the pipe has two partition plates, and discharges the fluid that has flowed into the gap formed between the two partition plates to the outside of the pipe. Even if the fluid leaks from one partition plate, the fluid is discharged from the gap via the discharge channel to the outside of the pipe. be able to. In addition, since installation processing at one place of the piping is sufficient, it can be carried out simply and inexpensively.

It is a longitudinal cross-sectional view which shows Embodiment 1 of this invention. It is an AA arrow line view of FIG. It is a figure which shows Embodiment 2 of this invention (corresponding to FIG. 2). It is a figure which shows Embodiment 3 of this invention (corresponding to FIG. 2). It is a figure which shows a prior art.

  Embodiments (Embodiments 1 to 3) of the present invention will be described with reference to the drawings.

[Embodiment 1]
FIG. 1 is a longitudinal sectional view showing Embodiment 1 of the present invention, and FIG. 2 is a view taken along arrow AA of FIG.

  As shown in FIG. 1 and FIG. 2, in the first embodiment of the present invention, the construction work is performed when the piping in which fluid (for example, fuel gas such as blast furnace gas or coke oven gas) is conducted is conducted. In order to prevent fluid from flowing into the pipe 4a on the part 21 side from the pipe 4b on the fluid conduction part 22 side, the partition plate jig 2 is provided between the flange 1a on the construction work part 21 side and the flange 1b on the fluid conduction part 22 side. Is inserted, and the flanges 1a and 1b are fastened together with bolts 7 and nuts 8 so as to cut off the fluid conduction.

  The partition plate jig 2 includes two partition plates having a bolt hole 9 corresponding to the bolting positions of the flanges 1a and 1b (the partition plate 2a on the construction work portion 21 side and the partition plate on the fluid conduction portion 22 side). 2b) and a spacer 3 (3A) sandwiched between the two partition plates 2a and 2b in order to form a gap 6 between the two partition plates 2a and 2b.

  Here, the outer shape of the partition plates 2a and 2b is circular, and the outer diameter is substantially equal to the outer diameter of the flanges 1a and 1b. Further, the thickness of the partition plate 2b is desirably a thickness that can withstand the maximum working pressure of the fluid. On the other hand, the thickness of the partition plate 2a is not necessarily the same as that of the partition plate 2b. In addition, you may provide the processus | protrusion 15 for the partition plates 2a and 2b.

  The spacer 3A in the first embodiment is provided in the vicinity of the bolt holes 9 for fastening the bolts provided in the partition plates 2a and 2b, and one spacer corresponding to one bolt hole 9 is provided. 3A is arranged, and each spacer 3A has a bolt hole 10 so as to overlap the bolt hole 9. The thickness of the spacer 3A is set so that the partition plate 2a and the partition plate 2b do not contact each other. Since the interval between the flanges 1a and 1b is often determined in advance according to the purpose of the piping, it is preferable to design the total thickness of the partition plates 2a and 2b and the spacer 3A to substantially match the interval.

  In addition, a gap 11 is provided between the adjacent spacers 3A and 3A. The gap 11 serves as a discharge flow path 14 for discharging the fluid flowing into the gap 6 out of the pipes 4a and 4b. ing.

  The spacer 3A may be welded to at least one of the partition plates 2a and 2b. This further simplifies the operation of installing the partition plate jig 2 between the flanges 1a and 1b.

  However, instead of welding the spacer 3A to the partition plates 2a and 2b, the spacer 3A may be aligned with the partition plates 2a and 2b and inserted between the flanges 1a and 1b and bolted. Thereby, the combination of the partition plates 2a and 2b and the spacer 3A can be freely changed to match the gap between the flanges 1a and 1b.

  Further, a bolt washer may be used as the spacer 3A. As a result, existing members can be utilized.

  Here, the outer shape of the spacer 3A is circular, but may be other shapes.

  Here, packing 5a and packing 5b are attached between the flange 1a and the partition plate 2a and between the flange 1b and the partition plate 2b, respectively, but when the construction work part 21 is in an air atmosphere. The packing 5a may not be provided.

  Thus, in Embodiment 1 of the present invention, the flange connection part (the construction part side flange 1a, the fluid conduction part side flange 1b) of the pipe (the construction part side pipe 4a, the fluid conduction part side pipe 4b) is used. The partition plate jig 2 to be inserted has two partition plates (the construction portion side partition plate 2a and the fluid conduction portion side partition plate 2b) and is formed between the two partition plates 2a and 2b. A discharge flow path 14 is provided for discharging the fluid that has flowed into the gap 6 to the outside of the pipes 4a and 4b. As shown as the leak point 19 in FIG. 2, the fluid leaks from the fluid conduction part side partition plate 2b. Even so, since the fluid is discharged from the gap 6 to the outside of the pipes 4a and 4b via the discharge channel 14, the fluid conduction can be accurately cut off. In addition, since installation processing at one place of the piping is sufficient, it can be carried out simply and inexpensively.

[Embodiment 2]
Embodiment 2 of the present invention basically has the same configuration as that of Embodiment 1 described above, but the shape and arrangement of the spacer 3 are different.

  FIG. 3 shows Embodiment 2 of the present invention, and corresponds to FIG. 2 in Embodiment 1 (a view taken along the line AA in FIG. 1).

  As shown in FIG. 3, the spacer 3 (3B) in the second embodiment is provided in the vicinity of the bolt holes 9 for bolting provided in the partition plates 2a and 2b, and the partition plates 2a and 2b The ring shape is concentric and has an outer diameter substantially the same as the outer diameter of the partition plates 2a and 2b, and has bolt holes 10 so as to overlap the bolt holes 9 of the partition plates 2a and 2b.

  The spacer 3B is provided with at least one notch (groove, hole) 12 penetrating from the inside to the outside of the ring shape at least at one place, and this notch 12 allows the fluid flowing into the gap 6 to flow outside the pipes 4a and 4b. It becomes the discharge flow path 14 for discharge | emission to.

  Note that the notch 12 does not have to be cut out of the entire thickness of the spacer 3B, and may have a size that allows fluid to flow from the inside to the outside of the ring shape.

  Thus, in Embodiment 2 of the present invention, the flange connection part (the construction part side flange 1a, the fluid conduction part side flange 1b) of the pipe (the construction part side pipe 4a, the fluid conduction part side pipe 4b) is used. The partition plate jig 2 to be inserted has two partition plates (the construction portion side partition plate 2a and the fluid conduction portion side partition plate 2b) and is formed between the two partition plates 2a and 2b. A discharge passage 14 is provided for discharging the fluid that has flowed into the gap 6 to the outside of the pipes 4a and 4b, and as shown as the leakage portion 19 in FIG. 3, the fluid leaks from the fluid conduction part side partition plate 2b. Even so, since the fluid is discharged from the gap 6 to the outside of the pipes 4a and 4b via the discharge channel 14, the fluid conduction can be accurately cut off. In addition, since installation processing at one place of the piping is sufficient, it can be carried out simply and inexpensively.

  The spacer 3B may have an arc shape obtained by cutting the ring at two to several places.

  Since only one spacer or only a few spacers 3B of Embodiment 2 are required, there is an advantage that the spacers 3B can be easily installed between the flanges 1a and 1b without being joined to the partition plate 2a and / or the partition plate 2b.

[Embodiment 3]
The third embodiment of the present invention basically has the same configuration as the first and second embodiments, but the shape and arrangement of the spacer 3 are different.

  FIG. 4 shows a third embodiment of the present invention, and corresponds to FIG. 2 (a view taken along the line AA in FIG. 1) in the first embodiment.

  As shown in FIG. 4, the spacer 3 (3C) in the third embodiment is provided in the vicinity of the bolt holes 9 for bolting provided in the partition plates 2a and 2b, and the adjacent bolt holes 9, One is arranged between 9.

  A gap 13 is provided between the bolt hole 9 and the spacer 3C. The gap 13 serves as a discharge flow path 14 for discharging the fluid flowing into the gap 6 to the outside of the pipes 4a and 4b. ing.

  In this way, in Embodiment 3 of the present invention, the flange connection part (the construction part side flange 1a, the fluid conduction part side flange 1b) of the pipe (the construction part side pipe 4a, the fluid conduction part side pipe 4b) is used. The partition plate jig 2 to be inserted has two partition plates (the construction portion side partition plate 2a and the fluid conduction portion side partition plate 2b) and is formed between the two partition plates 2a and 2b. A discharge flow path 14 is provided for discharging the fluid that has flowed into the gap 6 to the outside of the pipes 4a and 4b, and as shown as the leak point 19 in FIG. 4, the fluid leaked from the fluid conduction part side partition plate 2b. Even so, since the fluid is discharged from the gap 6 to the outside of the pipes 4a and 4b via the discharge channel 14, the fluid conduction can be accurately cut off. In addition, since installation processing at one place of the piping is sufficient, it can be carried out simply and inexpensively.

  In FIG. 4, the spacers 3 </ b> C are provided between all the bolt holes 9, but the spacers 3 </ b> C may be thinned out as appropriate, such as arranging every other spacer.

  As an example of the present invention (example of the present invention), when performing construction of piping in which fluid (fuel gas: blast furnace gas, coke oven gas, etc.) is conducted, Based on each, conduction | electrical_connection of the fluid (fuel gas) in piping was interrupted | blocked.

  At that time, the specifications of each part were as follows.

(Invention Example 1)
Gap between the construction work side flange and the fluid conduction part side flange: about 36.5 mm
Outer diameter and inner diameter of the flange: 1645 mm and 1400 mm, respectively
Bolt hole in flange: PCD 1535mm, 36 pieces, diameter 33mm
Construction side partition plate thickness: approx. 6mm
The thickness of the partition plate on the fluid conduction side: about 16mm
Packing thickness: about 5mm
Spacer thickness: about 4.5mm
Planar shape of spacer: Round flat washer of M30 Corresponding to Embodiment 1 ... Washer type with inner diameter of 31.5 mmφ and outer diameter of 58 mmφ
(Disposed in each bolt hole and welded to the partition plate 2a or 2b)
Corresponding to Embodiment 2 ... Ring shape with inner diameter of 1400mmφ and outer diameter of 1645mmφ
(One cut with a width of 40 mm is provided and not joined to the partition plate.
(It may be joined to the partition plate)
(A bolt hole is provided at the same position as the flange)
Corresponding to Embodiment 3 ... 65 mm x 100 mm rectangle
(Disposed between each bolt hole and welded to the partition plate 2a or 2b)

(Invention Example 2)
Gap between the construction work part side flange and the fluid conduction part side flange: about 45.5 mm
Outer diameter and inner diameter of flange part: 2405 mm and 2200 mm, respectively
Bolt hole in flange: PCD 2310mm, 52 pieces, diameter 35mm
Construction side partition plate thickness: approx. 6mm
The thickness of the partition plate on the fluid conduction side: about 19mm
Packing thickness: about 8mm
Spacer thickness: about 4.5mm
Corresponding to Embodiment 1 ... Washer type with inner diameter of 31.5 mmφ and outer diameter of 58 mmφ
(Disposed in each bolt hole and welded to the partition plate 2b)
Corresponding to the second embodiment: a ring shape with an inner diameter of 2200 mmφ and an outer diameter of 2405 mmφ
(Wave 45mm, depth 4mm 5 grooves are provided,
Do not join the partition plate. (It may be joined to the partition plate)
(A bolt hole is provided at the same position as the flange)
Corresponding to Embodiment 3 ... Rectangle of 100 mm x 50 mm
(Arranged between each bolt hole)

  As a result, in any case, the fuel gas in the fluid conduction portion side piping did not flow into the construction portion side piping, and the conduction of the fuel gas could be cut off accurately simply and inexpensively.

1a Construction work part side flange 1b Fluid conduction part side flange 1c Buffer part flange 1d Buffer part flange 2 Partition plate jig 2a Construction work part side partition plate 2b Fluid conduction part side partition plate 3 Spacer 3A Spacer 3B Spacer 3C Spacer 4a Construction work Part side piping 4b Fluid conduction part side piping 4c Buffer part piping 5a Construction work part side packing 5b Fluid conduction part side packing 6 Gap 7 Bolt 8 Nut 9 Bolt hole of spacer 10 Spacer bolt hole 11 Gap 12 Notch 13 Gap 14 Release Flow path 15 Protrusion for handling 19 Leakage location 21 Construction work section 22 Fluid conducting section 23 Buffer section 31 Partition plate 32 Bolt 33 Nut 34 Partition plate 35 Bolt 36 Nut 37 Balloon 38 Gate valve

Claims (8)

  It is a method of cutting off fluid conduction by inserting a partition plate jig into a flange connection portion of a pipe through which fluid is internally connected and bolting together with the flange, and the partition plate jig is a flange bolt In order to form a gap between the two partition plates having bolt holes corresponding to the fastening positions and the two partition plates, the spacer has a spacer sandwiched between the two partition plates and flows into the gap. A fluid conduction blocking method for piping, comprising a discharge channel for discharging fluid out of the piping.   The method of claim 1, wherein the spacer is joined to at least one partition plate.   3. The fluid conduction blocking method for piping according to claim 1 or 2, wherein the spacer is provided in the vicinity of the bolt hole for bolting provided in the partition plate.   The said spacer is a ring shape concentric with the said partition plate, It has the notch penetrated from the inner side of the ring shape to the outer side as the said discharge flow path. The fluid conduction blocking method for the pipe described.   A partition plate jig for inserting the inside into a flange connection portion of a pipe through which fluid is conducted to cut off fluid conduction, and having two bolt holes having bolt holes corresponding to the bolting positions of the flange In order to form a gap between the plate and the two partition plates, there is a spacer sandwiched between the two partition plates, and a discharge channel for discharging the fluid flowing into the gap to the outside of the pipe A partition plate jig characterized by comprising:   The partition plate jig according to claim 5, wherein the spacer is joined to at least one partition plate.   The partition plate jig according to claim 5 or 6, wherein the spacer is provided in the vicinity of the bolt hole for bolting provided in the partition plate.   8. The spacer according to claim 5, wherein the spacer has a ring shape concentric with the partition plate, and has a notch penetrating from the inside to the outside of the ring shape as the discharge channel. The partition plate jig of description.

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