JP3599769B2 - Piping protection structure - Google Patents

Piping protection structure Download PDF

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Publication number
JP3599769B2
JP3599769B2 JP1707494A JP1707494A JP3599769B2 JP 3599769 B2 JP3599769 B2 JP 3599769B2 JP 1707494 A JP1707494 A JP 1707494A JP 1707494 A JP1707494 A JP 1707494A JP 3599769 B2 JP3599769 B2 JP 3599769B2
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JP
Japan
Prior art keywords
protection
pipe
cylinder
small diameter
protection cylinder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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JP1707494A
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Japanese (ja)
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JPH07224992A (en
Inventor
英晴 仲本
省三 浜口
幸彦 工藤
正志 赤本
哲郎 小田
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Mitsubishi Power Ltd
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Babcock Hitachi KK
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Filing date
Publication date
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Priority to JP1707494A priority Critical patent/JP3599769B2/en
Publication of JPH07224992A publication Critical patent/JPH07224992A/en
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Description

【0001】
【産業上の利用分野】
この発明は配管の内側に保護筒が設けられた配管の保護構造、例えば過熱低減器の後流側に接続された配管の保護構造に関するものである。
【0002】
【従来の技術】
図4は従来の過熱低減器の後流側に接続された配管の保護構造を示す概略図、図5は図4に示した配管の保護構造の一部を示す断面図、図6は図4に示した配管の保護構造の一部を示す断面図、図7は図4に示した配管の保護構造の一部を示す断面図である。図に示すように、スプレーノズル4を有する過熱低減器1の後流側に直管配管2が突合せ溶接により接続され、過熱低減器1、直管配管2内に保護筒5a、5bが設けられ、保護筒5a、5bは突合せ溶接により接続され、過熱低減器1の内面に取付板10が溶接によって取り付けられ、取付板10に固定ピン8が溶接によって取り付けられ、固定ピン8は保護筒5aに設けられた孔を貫通し、保護筒5aの孔部に補強板9が溶接によって取り付けられ、固定ピン8は補強板9に設けられた孔を貫通している。また、保護筒5bの内面に補強板12が溶接によって取り付けられ、保護筒5b、補強板12に設けられた孔内にスライドサポート11が溶接によって取り付けられ、スライドサポート11の先端面は直管配管2の内面と当接している。また、保護筒5端部近傍の直管配管2の内面にストッパ13が設けられている。
【0003】
この配管の保護構造においては、スプレーノズル4からスプレー水が注されても、保護筒5a、5bによって過熱低減器1、直管配管2にスプレー水による熱衝撃が発生するのを防止することができる。
【0004】
また、実公平4−12328号公報に示されるように、過熱低減器の後流側の曲管配管を保護することが行なわれているが、この場合には図1〜図4で説明した保護構造と同様の構造によって、すなわち保護筒5の端部に曲管配管の保護筒を溶接によって取り付けることにより、曲管配管を保護することが考えられる。
【0005】
【発明が解決しようとする課題】
しかし、図1〜図4で説明した保護構造と同様の構造によって過熱低減器の後流側の曲管配管を保護したときには、配管と保護筒との伸び差が発生したとしても、保護筒のスライドが不可能になるので、保護筒に熱応力が発生し、またスプレーノズルからスプレー水が注入された場合、曲管配管部ではスプレー水は遠心力により保護筒の外周方向に片寄るから、保護筒の内外周での温度差が生じ、保護筒に曲げが発生するが、保護筒が拘束されているから、保護筒に熱応力が発生する。
【0006】
この発明は上述の課題を解決するためになされたもので、曲管配管を保護することができ、かつ保護筒に熱応力が発生することがない配管の保護構造を提供することを目的とする。
【0007】
【課題を解決するための手段】
この目的を達成するため、この発明においては、スプレーノズルを有する過熱低減器の後流側に直管配管と曲管配管が接続され、上記直管配管内に一端が固定されかつ他端が移動可能な第1の保護筒が設けられた配管の保護構造において、上記曲管配管内に一端が上記曲管配管の上流側端の曲げ中間点に固定ピンにより固定されかつ他端が複数のスライドサポートにより移動可能に支持された第2の保護筒を設け、上記第1の保護筒の後流側端部に小径部を設け、上記小径部の外側に上記第2の保護筒の上流側端部を位置させる。
【0008】
この場合、上記第1の保護筒の後流側端部に上記小径部を有する継ぎピースを取り付ける。
【0010】
【作用】
この配管の保護構造においては、直管配管と第1の保護筒との伸び差が発生したとしても、第1の保護筒のスライドが可能になる。
【0011】
また、第1の保護筒の後流側端部に小径部を有する継ぎピースを取り付けたときには、第1の保護筒の後流側端部に容易に小径部を設けることができる。
【0012】
また、直管配管を過熱低減器の後流側に接続したときには、スプレーノズルからスプレー水が注入され、第2の保護筒の内外周での温度差が生じ、第2の保護筒に曲げが発生したとしても、第2の保護筒に熱応力が発生することがない。
【0013】
【実施例】
図1はこの発明に係る配管の保護構造を示す概略図、図2は図1に示した配管の保護構造の一部を示す断面図である。図に示すように、過熱低減器1の後流側に直管配管2aが突合せ溶接によって接続され、直管配管2aの後流側に曲管配管3が突合せ溶接によって接続され、曲管配管3の後流側に直管配管2bが突合せ溶接によって接続され、直管配管2a、2b内に一端が固定ピン8によって固定されかつ他端がスライドサポート11によって移動可能に支持された第1の保護筒5b、保護筒5cが設けられ、曲管配管3内に一端が曲管配管3の上流側端内の曲げ中間点(外周と内周との中間部、すなわち曲管配管3の曲げ中心点を通りかつ曲管配管3の中心線を含む面と直角な線を中心線とし、しかも半径が上記曲げ中心点から曲管配管3の中心線までの距離である円筒が、曲管配管3と交わる部分)に固定ピン8によって固定されかつ他端が複数のスライドサポート11によって移動可能に支持された第2の保護筒6が設けられ、保護筒5bの後流側端部にレジュース状に加工されて小径部を有する継ぎピース7aが突合せ溶接によって取り付けられ、継ぎピース7aの小径部の外側に保護筒6の上流側端部が位置し、保護筒6の後流側端部に小径部を有する継ぎピース7bが突合せ溶接によって取り付けられ、継ぎピース7bの小径部の外側に保護筒5cの上流側端部が位置している。
【0014】
この配管の保護構造においては、直管配管2aと保護筒5bとの伸び差が発生したとしても、保護筒5bのスライドが可能になるから、保護筒5bに熱応力が発生することがないので、保護筒5bが損傷することがない。また、保護筒5b、6の後流側端部に小径部を有する継ぎピース7a、7bを取り付けたときには、保護筒5b、6の後流側端部に容易に小径部を設けることができるから、、製造コストが安価になり、しかも継ぎピース7a、7bは機械加工によって製作されるから、各継ぎピース7a、7bを接続すべき保護筒5b、6の接続部の寸法に合わせて加工すれば、保護筒5b、6の後流側端部に継ぎピース7a、7bを容易に取り付けることができ、しかも継ぎピース7a、7bの隙間寸法a、挿入長さbを正確にすることができる。また、スプレーノズル4からスプレー水が注入され、保護筒6の内外周での温度差が生じ、保護筒6に曲げが発生したとしても、保護筒6に熱応力が発生することがないから、保護筒6が損傷することがない。また、曲管配管3と保護筒6との伸び差が発生したとしても、保護筒6のスライドが可能になるから、保護筒6に熱応力が発生することがないので、保護筒6が損傷することがない。また、仮に保護筒5b、6の端部を突合せ溶接によって接続したときには、保護筒5bが鋼板製である場合には、保護筒5bが薄肉となり、接続部開先合わせが非常に困難であるから、製造が面倒であるのに対して、図1、図2に示した配管の保護構造においては、保護筒5b、6の端部を突合せ溶接によって接続しないから、保護筒5bが鋼板製である場合にも、製造が非常に容易である。
【0015】
図3はこの発明に係る他の配管の保護構造を示す概略図である。図に示すように、直管配管2aの後流側に曲管配管3aが突合せ溶接によって接続され、曲管配管3aの後流側に曲管配管3bが突合せ溶接によって接続され、曲管配管3bの後流側に直管配管2bが突合せ溶接によって接続され、直管配管2a、2b内に一端が固定ピン8によって固定されかつ他端がスライドサポート11によって移動可能に支持された第1の保護筒5b、保護筒5cが設けられ、曲管配管3a、3b内に一端が固定ピン8によって固定されかつ他端がスライドサポート11によって移動可能に支持された第2の保護筒6a、保護筒6bが設けられ、保護筒5bの後流側端部に小径部を有する継ぎピース7aが突合せ溶接によって取り付けられ、継ぎピース7aの小径部の外側に保護筒6aの上流側端部が位置し、保護筒6aの後流側端部に小径部を有する継ぎピース7bが突合せ溶接によって取り付けられ、継ぎピース7bの小径部の外側に保護筒6bの上流側端部が位置し、保護筒6bの後流側端部に小径部を有する継ぎピース7cが突合せ溶接によって取り付けられ、継ぎピース7cの小径部の外側に保護筒5cの上流側端部が位置している。
【0016】
この配管の保護構造においては、曲管配管3a、3bと保護筒6a、6bとの伸び差が発生したとしても、保護筒6a、6bのスライドが可能になるから、保護筒6a、6bに熱応力が発生することがないので、保護筒6a、6bが損傷することがない。
【0017】
【発明の効果】
以上説明したように、この発明に係る配管の保護構造においては、直管配管と第1の保護筒との伸び差が発生したとしても、第1の保護筒のスライドが可能になるから、第1の保護筒に熱応力が発生することがないので、第1の保護筒が損傷することがない。
【0018】
また、第1の保護筒の後流側端部に小径部を有する継ぎピースを取り付けたときには、第1の保護筒の後流側端部に容易に小径部を設けることができるから、製造コストが安価になる。
【0019】
また、直管配管を過熱低減器の後流側に接続したときには、スプレーノズルからスプレー水が注入され、第2の保護筒の内外周での温度差が生じ、第2の保護筒に曲げが発生したとしても、第2の保護筒に熱応力が発生することがないから、第2の保護筒が損傷することがない。
【図面の簡単な説明】
【図1】この発明に係る配管の保護構造を示す概略図である。
【図2】図1に示した配管の保護構造の一部を示す断面図である。
【図3】この発明に係る他の配管の保護構造を示す概略図である。
【図4】従来の配管の保護構造を示す概略図である。
【図5】図4に示した配管の保護構造の一部を示す断面図である。
【図6】図4に示した配管の保護構造の一部を示す断面図である。
【図7】図4に示した配管の保護構造の一部を示す断面図である。
【符号の説明】
1…過熱低減器
2a…直管配管
3、3a…曲管配管
5b…第1の保護筒
6、6a…第2の保護筒
[0001]
[Industrial applications]
The present invention relates to a pipe protection structure in which a protection cylinder is provided inside a pipe, for example, a pipe protection structure connected to a downstream side of an overheat reducer.
[0002]
[Prior art]
FIG. 4 is a schematic view showing a protection structure of a pipe connected to the downstream side of the conventional overheat reducer, FIG. 5 is a cross-sectional view showing a part of the protection structure of the pipe shown in FIG. 4, and FIG. 7 is a sectional view showing a part of the pipe protection structure shown in FIG. 7, and FIG. 7 is a sectional view showing a part of the pipe protection structure shown in FIG. As shown in the figure, a straight pipe 2 is connected to the downstream side of the superheat reducer 1 having a spray nozzle 4 by butt welding, and protective tubes 5a and 5b are provided in the superheat reducer 1 and the straight pipe 2. , The protection cylinders 5a and 5b are connected by butt welding, a mounting plate 10 is mounted on the inner surface of the desuperheater 1 by welding, a fixing pin 8 is mounted on the mounting plate 10 by welding, and the fixing pin 8 is connected to the protection cylinder 5a. The reinforcing plate 9 is attached to the hole of the protection cylinder 5a by welding, and the fixing pin 8 penetrates the hole provided in the reinforcing plate 9. Further, a reinforcing plate 12 is attached to the inner surface of the protective cylinder 5b by welding, and a slide support 11 is attached to a hole provided in the protective cylinder 5b and the reinforcing plate 12 by welding. 2 is in contact with the inner surface. Further, a stopper 13 is provided on the inner surface of the straight pipe 2 near the end of the protection cylinder 5.
[0003]
In this pipe protection structure, even if spray water is poured from the spray nozzle 4, the protection cylinders 5a and 5b can prevent the thermal shock caused by the spray water from being generated in the superheat reducer 1 and the straight pipe 2. it can.
[0004]
Further, as shown in Japanese Utility Model Publication No. 4-12328, protection of a curved pipe on the downstream side of the overheat reducer is performed. In this case, the protection described with reference to FIGS. It is conceivable to protect the bent pipe by a structure similar to the structure, that is, by attaching the protection pipe of the bent pipe to the end of the protection pipe 5 by welding.
[0005]
[Problems to be solved by the invention]
However, when the bent pipe on the downstream side of the desuperheater is protected by a structure similar to the protection structure described in FIGS. 1 to 4, even if a difference in elongation occurs between the pipe and the protection cylinder, Since sliding becomes impossible, thermal stress occurs in the protective cylinder, and when spray water is injected from the spray nozzle, the spray water in the curved pipe piping part is biased to the outer peripheral direction of the protective cylinder due to centrifugal force. A temperature difference occurs between the inner and outer peripheries of the cylinder, causing bending of the protective cylinder. However, since the protective cylinder is restrained, thermal stress occurs in the protective cylinder.
[0006]
The present invention has been made to solve the above-described problem, and has an object to provide a pipe protection structure that can protect a curved pipe and does not generate thermal stress in a protection cylinder. .
[0007]
[Means for Solving the Problems]
In order to achieve this object, in the present invention, a straight pipe and a curved pipe are connected to the downstream side of the desuperheater having a spray nozzle , and one end is fixed and the other end is moved in the straight pipe. In a pipe protection structure provided with a possible first protection cylinder, one end is fixed to a bending intermediate point at an upstream end of the bent pipe in the bent pipe by a fixing pin, and the other end is a plurality of slides. A second protection cylinder movably supported by a support is provided, a small diameter portion is provided at a downstream end of the first protection cylinder, and an upstream end of the second protection cylinder is provided outside the small diameter portion. Position the part.
[0008]
In this case, the joint piece having the small diameter portion is attached to the downstream end of the first protection cylinder.
[0010]
[Action]
In this pipe protection structure, even if a difference in elongation occurs between the straight pipe and the first protection cylinder, the first protection cylinder can slide.
[0011]
Further, when a joint piece having a small diameter portion is attached to the downstream end of the first protection cylinder, the small diameter portion can be easily provided at the downstream end of the first protection cylinder.
[0012]
When the straight pipe is connected to the downstream side of the desuperheater, spray water is injected from the spray nozzle, and a temperature difference occurs between the inner and outer peripheries of the second protective cylinder, and the second protective cylinder is bent. Even if it occurs, no thermal stress occurs in the second protection cylinder.
[0013]
【Example】
FIG. 1 is a schematic diagram showing a pipe protection structure according to the present invention, and FIG. 2 is a sectional view showing a part of the pipe protection structure shown in FIG. As shown in the figure, a straight pipe 2a is connected to the downstream side of the superheat reducer 1 by butt welding, and a curved pipe 3 is connected to the downstream side of the straight pipe 2a by butt welding. A first protection pipe in which a straight pipe 2b is connected to the downstream side by butt welding, one end of which is fixed in the straight pipes 2a and 2b by a fixing pin 8 and the other end is movably supported by a slide support 11. A tube 5b and a protection tube 5c are provided, and one end of the inside of the curved pipe 3 is bent at a bending intermediate point (an intermediate portion between the outer circumference and the inner circumference, that is, a bending center point of the bent pipe 3). And a cylinder whose center line is a line perpendicular to the plane including the center line of the curved pipe 3 and whose radius is the distance from the bending center point to the center line of the curved pipe 3, intersecting portion) is fixed by a fixing pin 8 and having the other end a plurality of scan A second protection cylinder 6 movably supported by the id support 11 is provided, and a joint piece 7a having a small diameter portion processed into a juice shape and attached to the downstream end of the protection cylinder 5b is attached by butt welding. The upstream end of the protection tube 6 is located outside the small diameter portion of the joint piece 7a, and the joint piece 7b having the small diameter portion is attached to the downstream end of the protection tube 6 by butt welding. The upstream end of the protection cylinder 5c is located outside the small diameter portion.
[0014]
In this pipe protection structure, even if a difference in elongation occurs between the straight pipe 2a and the protection cylinder 5b, the protection cylinder 5b can slide, so that no thermal stress is generated in the protection cylinder 5b. The protection cylinder 5b is not damaged. Further, when the joint pieces 7a, 7b each having a small-diameter portion are attached to the downstream ends of the protection cylinders 5b, 6, the small-diameter portions can be easily provided at the downstream ends of the protection cylinders 5b, 6. Since the manufacturing cost is reduced and the joint pieces 7a and 7b are manufactured by machining, the joint pieces 7a and 7b should be machined according to the dimensions of the connecting portions of the protective cylinders 5b and 6 to which the joint pieces 7a and 7b should be connected. The joint pieces 7a, 7b can be easily attached to the downstream ends of the protection cylinders 5b, 6, and the gap dimension a and the insertion length b of the joint pieces 7a, 7b can be made accurate. Further, even if spray water is injected from the spray nozzle 4 and a temperature difference occurs between the inner and outer peripheries of the protective cylinder 6 and the protective cylinder 6 is bent, no thermal stress is generated in the protective cylinder 6. The protective cylinder 6 is not damaged. Further, even if a difference in elongation occurs between the curved pipe 3 and the protection cylinder 6, the protection cylinder 6 can slide, and thus no thermal stress is generated in the protection cylinder 6, so that the protection cylinder 6 is damaged. I can't. Further, if the ends of the protection cylinders 5b and 6 are connected by butt welding, if the protection cylinder 5b is made of a steel plate, the protection cylinder 5b becomes thin, and it is very difficult to adjust the connection groove. 1 and 2, the ends of the protection tubes 5b and 6 are not connected by butt welding, so that the protection tube 5b is made of a steel plate. In some cases, it is very easy to manufacture.
[0015]
FIG. 3 is a schematic view showing another piping protection structure according to the present invention. As shown in the figure, a curved pipe 3a is connected to the downstream side of the straight pipe 2a by butt welding, and a curved pipe 3b is connected to the downstream side of the curved pipe 3a by butt welding. A first protection pipe in which a straight pipe 2b is connected to the downstream side by butt welding, one end of which is fixed in the straight pipes 2a and 2b by a fixing pin 8 and the other end is movably supported by a slide support 11. A second protection cylinder 6a and a protection cylinder 6b provided with a cylinder 5b and a protection cylinder 5c, one end of which is fixed in the curved pipes 3a and 3b by a fixing pin 8 and the other end of which is movably supported by a slide support 11. The joint piece 7a having a small diameter portion is attached to the downstream end of the protection cylinder 5b by butt welding, and the upstream end of the protection cylinder 6a is positioned outside the small diameter portion of the joint piece 7a. Pipe A joint piece 7b having a small diameter portion is attached to the downstream end of the protective tube 6b by butt welding, and the upstream end of the protection cylinder 6b is located outside the small diameter portion of the joint piece 7b. A joint piece 7c having a small diameter portion at the end is attached by butt welding, and the upstream end of the protection cylinder 5c is located outside the small diameter portion of the joint piece 7c.
[0016]
In this pipe protection structure, even if a difference in elongation occurs between the bent pipes 3a, 3b and the protection cylinders 6a, 6b, the protection cylinders 6a, 6b can slide. Since no stress is generated, the protection cylinders 6a and 6b are not damaged.
[0017]
【The invention's effect】
As described above, in the pipe protection structure according to the present invention, even if a difference in elongation occurs between the straight pipe and the first protection cylinder, the first protection cylinder can slide. Since no thermal stress is generated in the first protection cylinder, the first protection cylinder is not damaged.
[0018]
In addition, when a joint piece having a small diameter portion is attached to the downstream end of the first protection cylinder, the small diameter portion can be easily provided at the downstream end of the first protection cylinder. Is cheaper.
[0019]
When the straight pipe is connected to the downstream side of the desuperheater, spray water is injected from the spray nozzle, and a temperature difference occurs between the inner and outer peripheries of the second protective cylinder, and the second protective cylinder is bent. Even if it occurs, no thermal stress is generated in the second protection cylinder, so that the second protection cylinder is not damaged.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a pipe protection structure according to the present invention.
FIG. 2 is a cross-sectional view showing a part of the pipe protection structure shown in FIG.
FIG. 3 is a schematic view showing another piping protection structure according to the present invention.
FIG. 4 is a schematic view showing a conventional pipe protection structure.
5 is a cross-sectional view showing a part of the pipe protection structure shown in FIG.
6 is a cross-sectional view showing a part of the pipe protection structure shown in FIG.
7 is a cross-sectional view showing a part of the pipe protection structure shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Overheat reducer 2a ... Straight pipe 3, 3a ... Curved pipe 5b ... 1st protection cylinder 6, 6a ... 2nd protection cylinder

Claims (2)

スプレーノズルを有する過熱低減器の後流側に直管配管と曲管配管が接続され、上記直管配管内に一端が固定されかつ他端が移動可能な第1の保護筒が設けられた配管の保護構造において、上記曲管配管内に一端が上記曲管配管の上流側端の曲げ中間点に固定ピンにより固定されかつ他端が複数のスライドサポートにより移動可能に支持された第2の保護筒を設け、上記第1の保護筒の後流側端部に小径部を設け、上記小径部の外側に上記第2の保護筒の上流側端部を位置させたことを特徴とする配管の保護構造。 A pipe in which a straight pipe and a curved pipe are connected to the downstream side of a superheat reducer having a spray nozzle, and a first protective cylinder fixed at one end and movable at the other end is provided in the straight pipe. In the protection structure of (1), a second protection in which one end is fixed to a bending intermediate point at an upstream end of the bent pipe by a fixing pin and the other end is movably supported by a plurality of slide supports in the bent pipe. A pipe, wherein a small diameter portion is provided at a downstream end of the first protection cylinder, and an upstream end of the second protection cylinder is located outside the small diameter section. Protection structure. 上記第1の保護筒の後流側端部に上記小径部を有する継ぎピースを取り付けたことを特徴とする請求項1に記載の配管の保護構造。The piping protection structure according to claim 1, wherein a joint piece having the small diameter portion is attached to a downstream end of the first protection cylinder.
JP1707494A 1994-02-14 1994-02-14 Piping protection structure Expired - Lifetime JP3599769B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1707494A JP3599769B2 (en) 1994-02-14 1994-02-14 Piping protection structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1707494A JP3599769B2 (en) 1994-02-14 1994-02-14 Piping protection structure

Publications (2)

Publication Number Publication Date
JPH07224992A JPH07224992A (en) 1995-08-22
JP3599769B2 true JP3599769B2 (en) 2004-12-08

Family

ID=11933841

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1707494A Expired - Lifetime JP3599769B2 (en) 1994-02-14 1994-02-14 Piping protection structure

Country Status (1)

Country Link
JP (1) JP3599769B2 (en)

Also Published As

Publication number Publication date
JPH07224992A (en) 1995-08-22

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