JPS61213404A - Methd of removing heat-transfer pipe - Google Patents
Methd of removing heat-transfer pipeInfo
- Publication number
- JPS61213404A JPS61213404A JP5428785A JP5428785A JPS61213404A JP S61213404 A JPS61213404 A JP S61213404A JP 5428785 A JP5428785 A JP 5428785A JP 5428785 A JP5428785 A JP 5428785A JP S61213404 A JPS61213404 A JP S61213404A
- Authority
- JP
- Japan
- Prior art keywords
- tube
- heat exchanger
- exchanger tube
- tube sheet
- sheet
- 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.)
- Granted
Links
Landscapes
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Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、例えば蒸気発生器のような熱交換器等に関係
しており、特にその管板に拡管固定された伝熱管を除去
する方法に関するものである６［従来の技術］
第５図に示すように、このような熱交換器等の伝熱管２
は、厚い管板１内に挿入され、管板１の厚さの一部又は
全厚にわたるその拡管部又は管端部３で、ローラ拡管や
液圧拡管等の方法で管板１に固着されるのが典型的であ
り、また、管板１の内側で、即ち第５図において見て下
側でシール溶接部４により管板１にシール溶接され、管
板１の内側及び外側の間に対しを造る構造になっている
。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to heat exchangers such as steam generators, and in particular, to a method for removing heat exchanger tubes that are expanded and fixed to their tube sheets. 6 [Prior Art] As shown in FIG.
is inserted into a thick tube sheet 1, and is fixed to the tube sheet 1 by a method such as roller expansion or hydraulic expansion at its expanded section or tube end 3 that spans part or the entire thickness of the tube sheet 1. It is typically seal-welded to the tubesheet 1 by a seal weld 4 on the inside of the tubesheet 1, i.e. on the lower side as viewed in FIG. It has a structure that creates an opposing structure.
この伝熱管２は、当業者周知のように、その構造的健全
性を評価するなどの目的で、ある期間運松後に、サンプ
リングのため管板から抜き出されることがる。As is well known to those skilled in the art, the heat transfer tube 2 may be removed from the tubesheet for sampling after a period of time, such as to assess its structural integrity.
管板１から伝熱管２を抜き出す従来の抜管方法の一例を
第７図（ａ）〜（ｄ）に関連して説明すると、シール溶
接部４の切除、伝熱管２の輪切り切断、拡管部３の案内
面のＴＩＧアーク加熱、伝熱管２の引き抜き等の一連の
作業を伴う次のようなステップに従って行なわれていた
。An example of a conventional tube extraction method for extracting the heat exchanger tube 2 from the tube sheet 1 will be explained with reference to FIGS. 7(a) to (d). The process was carried out according to the following steps, which involved a series of operations such as TIG arc heating of the guide surface and pulling out of the heat exchanger tube 2.
即ち、第７図（ａ）に示す最初のステップでは、抜管対
象の伝熱Ｗ２のシール溶接部４を例えばエンドミルρよ
うな回転型工具５で管板１の内側から切削し除去する。That is, in the first step shown in FIG. 7(a), the seal weld 4 of the heat transfer W2 to be extubated is removed by cutting it from the inside of the tube sheet 1 with a rotary tool 5 such as an end mill ρ.
次に、第７図（ｂ）に示すように、伝熱管２をそのサン
プリング対象部分の直上の所定部分で、管の肉厚方向に
輪切り状に切断する。Next, as shown in FIG. 7(b), the heat exchanger tube 2 is cut into rounds in the thickness direction of the tube at a predetermined portion directly above the sampling target portion.
この輪切り切断は、図示のような回転型切断工具６を使
用して管板１の内側から行なわれる。７が輪切り切断部
である。しかる後、拡管部３の応力弛緩を行うため、＃
１７図（ｃ）に示すように、ＴＩＧアーク加゛熱トーチ
８を管板１の内側から抜管対象部分に挿入して、伝熱管
２の拡管部３の内面を双頭矢印で示すように軸方向に走
査し、内面を軸方向に数条加熱熔融しで、管板１と伝熱
管２との開の固着力を弱める。最後に、第７図（ｄ）に
示すように、シール溶接１１１Ｓ４を削除した伝熱管２
の拡管部３に、ねじ状の方形を持った切削工具９を回し
て管板１の内側からねじ込んだ後、この切削工具９を下
方向に引っ張ることにより、抜管が終了する。This round cutting is performed from the inside of the tube sheet 1 using a rotary cutting tool 6 as shown. 7 is a round cutting part. After that, in order to relieve the stress in the tube expansion part 3,
As shown in Fig. 17(c), insert the TIG arc heating torch 8 from the inside of the tube sheet 1 into the part to be extruded, and axially move the inner surface of the expanded section 3 of the heat exchanger tube 2 as shown by the double-headed arrow. The inner surface is heated and melted several times in the axial direction to weaken the adhesive force between the tube sheet 1 and the heat transfer tubes 2. Finally, as shown in FIG. 7(d), the heat exchanger tube 2 with the seal weld 111S4 removed
After screwing a cutting tool 9 having a rectangular screw shape into the expanded tube portion 3 from the inside of the tube plate 1, the cutting tool 9 is pulled downward to complete the tube removal.
以上の抜管方法は、第５図及び第６図から明らかなよう
に、横断面形状が円形で且つ未拡管部の外径が管板の穴
径より小さい伝熱管について実施されている。ところが
伝熱管には種々の構造のものがあり、例えば突条又はリ
ブ付き伝熱管のように、最大外径が管板の穴径より大き
いものもある。As is clear from FIGS. 5 and 6, the above tube removal method is carried out on a heat exchanger tube having a circular cross-sectional shape and an outer diameter of the unexpanded portion smaller than the hole diameter of the tube plate. However, heat exchanger tubes have various structures, and some, such as heat exchanger tubes with protrusions or ribs, have a maximum outer diameter larger than the hole diameter of the tube sheet.
１発明が解決しようとする問題点】
従って、従来の抜管方法では、最大外径部が管板の穴径
より大きい伝熱管を引き抜こうとしても、最大外径部は
管板の穴を通ることができず、このような伝熱管には適
用できない問題点があった。1. Problems to be Solved by the Invention] Therefore, in the conventional tube removal method, even if an attempt is made to pull out a heat transfer tube whose maximum outside diameter is larger than the hole diameter of the tube sheet, the maximum outside diameter will pass through the hole in the tube sheet. There was a problem that it could not be applied to such heat exchanger tubes.
１問題点を解決するための手段］
本発明は、上述した問題点を速やかに解決することを目
的として、厚い管板に拡管固定されると共に、該管板に
シール溶接され、外面に軸方向突条を円周方向に隔たっ
て有する伝熱管の除去方法において、前記シール溶接部
を切除し、前記管板の内側から該伝熱管を切断し、切断
された伝熱管の前記管板側の部分のうち、前記突条のな
い突条間部分の伝熱管壁に、前記伝熱管の切断端に開放
されるスロットを軸方向に形成し、前記伝熱管の拡管固
定部を前記管板より内側で加熱するものである。Means for Solving Problem 1] In order to quickly solve the above-mentioned problems, the present invention is directed to expanding and fixing a tube to a thick tube sheet, seal-welding the tube to the tube sheet, and providing an axial direction on the outer surface. In a method for removing a heat exchanger tube having protrusions spaced apart in the circumferential direction, the seal weld is removed, the heat exchanger tube is cut from the inside of the tube sheet, and the portion of the cut heat exchanger tube on the tube sheet side A slot that is opened at the cut end of the heat exchanger tube is formed in the axial direction on the wall of the heat exchanger tube between the ridges where there is no ridge, and the expansion fixing part of the heat exchanger tube is placed inside the tube plate. It is heated with
［作用１
本発明の抜管方法においでは、拡管固定部を加熱した後
、抜管対象の伝熱管を引き抜（際に、突条の終端部が管
板にある穴の周縁に最初当接するが、突条のない突条間
部分の伝熱管壁に、伝熱管の切断端に開放されるスロッ
トを軸方向に形成するステップを含むため、引き抜塾作
業を続けると、スロットを画成千る突条部分が半径方向
内方に撓み、最大外径が穴径よりも小さくなる。そのた
め、抜管対象の伝熱管は管板の穴径より大径のものであ
っても管板から引き抜くことができる。[Operation 1] In the tube extraction method of the present invention, after heating the tube expansion fixing part, the heat exchanger tube to be extracted is pulled out (at this time, the terminal end of the protrusion first contacts the periphery of the hole in the tube plate, but This includes the step of forming a slot in the axial direction on the heat exchanger tube wall in the area between the ridges without ridges, which is opened at the cut end of the heat exchanger tube. The protruding portion bends inward in the radial direction, and the maximum outer diameter becomes smaller than the hole diameter.Therefore, even if the heat exchanger tube to be extracted has a diameter larger than the hole diameter in the tube sheet, it cannot be pulled out from the tube sheet. can.
［実施例］
次に、本発明による伝熱管の除去方法の好適な実施例を
第１図〜第４図に関連して詳細に説明するが、図中、第
５図〜第７図の従来技術について用いた符号と同一の符
号は、同−又は対応部分を示すものとする。[Example] Next, a preferred embodiment of the heat exchanger tube removal method according to the present invention will be explained in detail with reference to FIGS. 1 to 4. The same reference numerals as those used for technology shall indicate the same or corresponding parts.
第１図は、本発明を適用できる伝熱管２を管板１に拡管
固定した状態で示す断面図であり、第２図は第１図の■
−■線断面図である。これ等の図から明らかなように、
また、第５図に示した円形伝熱管と同様に、伝熱管２は
、厚い管板１内に挿入され、管板１の厚さの一部又は全
厚にわたるその拡管部又は管端部（拡管固定部）３で、
ローラ拡管や液圧拡管等の方法で管板１に固着されるの
が典型的であり、また、管板１の内側で、即ち第１図に
おいて見て下側でシール溶接部４により管板１にシール
溶接され、管＠１の内側及び外側の間に対しを造る構造
になっている。更に、第１図及び第２図から明らかなよ
うに、伝熱管２の外面には数本（実施例では円周方向に
９０”づつ隔たって４本）の突条又はリブ２ａが、管板
１の上面より若干上方から軸方向に延びており、直径方
向に対峙する一対の突条の、半径方向最外側部分間の寸
法、即ち最大外径部の直径ｄ１は、管板１にある穴の直
径ｄ２よりも大きい。FIG. 1 is a cross-sectional view showing a heat exchanger tube 2 to which the present invention can be applied in a state where it is expanded and fixed to a tube plate 1, and FIG.
It is a sectional view taken along the line -■. As is clear from these figures,
In addition, similar to the circular heat exchanger tube shown in FIG. Expansion fixing part) 3,
Typically, it is fixed to the tube sheet 1 by a method such as roller expansion or hydraulic expansion, and the tube sheet is fixed to the tube sheet 1 by a seal weld 4 on the inside of the tube sheet 1, that is, on the lower side as seen in FIG. 1, and has a structure that creates a gap between the inside and outside of the tube @1. Furthermore, as is clear from FIGS. 1 and 2, several (in the embodiment, four ribs 90" apart in the circumferential direction) protrusions or ribs 2a are formed on the outer surface of the heat exchanger tube 2. The dimension between the outermost portions in the radial direction of a pair of diametrically opposed protrusions that extend in the axial direction from slightly above the upper surface of the tube sheet 1, that is, the diameter d1 of the maximum outer diameter portion, is the diameter d1 of the hole in the tube sheet 1. is larger than the diameter d2 of.
このような伝熱管２を本発明に従って管板１がら引き抜
くに際しては、第７図（、）に示した従来方法のステッ
プと同様に、管板１と伝熱管２どのシール溶接部４をエ
ンドミル等を使用する機械的方法により切除し、或は放
電切断又は加工のような電気的方法等により切除し、次
に、抜管したい部分を管板１側に残し、伝熱管２を輪切
り状に肉厚方向に切断する。この切断方法は、第７図（
ｂ）に関連して説明したように行っても、また、前述し
た機械的方法又は電気的方法により行ってもよい。When pulling out such a heat exchanger tube 2 from the tube sheet 1 according to the present invention, similar to the steps of the conventional method shown in FIG. The heat exchanger tube 2 is cut out by a mechanical method using a tube, or by an electric method such as electric discharge cutting or machining, and then the heat exchanger tube 2 is cut into circular slices with a thick wall, leaving the part to be removed on the tube sheet 1 side. Cut in the direction. This cutting method is shown in Figure 7 (
It may be carried out as described in connection with b) or by the mechanical or electrical methods mentioned above.
次に、伝熱管２の抜管対象部分だけを示す第３図から明
らかなように、突条付き伝熱管２の適当な隣接突条間、
即ち突条のない突条間部分〈実施例では全ての隣接突条
間に合計４本）を縦割り切断して、軸方向に延びるスロ
ッ）２ｂを形成し、剣道の竹刀のような状態にする。該
スロッ）２ｂは伝熱管２の切断１２ｃに開放することが
肝要である。Next, as is clear from FIG. 3, which shows only the portion of the heat exchanger tube 2 to be extruded, the distance between the adjacent ridges of the heat exchanger tube 2 with ridges,
That is, the portion between the protrusions without protrusions (in the example, a total of 4 between all adjacent protrusions) is cut vertically to form slots 2b extending in the axial direction, resembling a shinai in Kendo. do. It is important that the slot 2b is open to the cut 12c of the heat transfer tube 2.
この場合、円周方向のスロット幅は、突条２ａの高さ又
は前述した直径ｄ３、ｄ２の比を考慮し、縦割り切断後
に残った軸方向部分が半径方向に集束したときの集束部
外径が直径ｄ、よりも小さくなるように適宜決定される
。この後、第７図（ｅ）に示したように通常の抜管作業
と同じ（、管板１に対する伝熱管２の拡管部３を、管板
１の内側からＴＩＧアーク加熱により、伝熱管内面を軸
方向に数条加熱熔融して、管板１と伝熱管２との間の固
着力を弛緩させてから、ｔｌ＆４図に示すように、ねじ
方形を持った第７図（ｄ）の工具と同様の工具９を伝熱
管２の下端にねじ込み、伝熱管２の抜管対象部分を矢印
で示す方向に引き抜く。In this case, the slot width in the circumferential direction is determined by considering the height of the protrusion 2a or the ratio of the diameters d3 and d2 mentioned above, and the width of the slot outside the converging area when the axial portion remaining after vertical cutting is converged in the radial direction. The diameter is appropriately determined to be smaller than the diameter d. After this, as shown in FIG. 7(e), the expanded part 3 of the heat exchanger tube 2 relative to the tube sheet 1 is heated by TIG arc heating from the inside of the tube sheet 1, and the inner surface of the heat exchanger tube is After heating and melting several threads in the axial direction to loosen the adhesion force between the tube sheet 1 and the heat exchanger tube 2, as shown in Fig. A similar tool 9 is screwed into the lower end of the heat exchanger tube 2, and the portion of the heat exchanger tube 2 to be extubated is pulled out in the direction shown by the arrow.
この時、管板１側に向かって徐々に肉薄になる各突条２
ａのテーパ付き終端部２ｄが案内の役目を果たし、伝熱
管２は管板１の穴内に滑り込んで行くことになる。引き
抜き作業を続けると、スロット２ｂを画成する突条付き
部分が半径方向内方に撓み、最大外径ｄ、が穴径ｄ２よ
りも小さくなる。そのため、穴径ｄ２よりも大きい最大
外径ｄ、を最初に持っていた抜管対象の伝熱管２でも管
板１から容易に引き抜くことができる。At this time, each protrusion 2 gradually becomes thinner toward the tube plate 1 side.
The tapered end portion 2d of a serves as a guide, and the heat exchanger tube 2 slides into the hole in the tube sheet 1. As the drawing operation continues, the protruding portion defining the slot 2b bends inward in the radial direction, and the maximum outer diameter d becomes smaller than the hole diameter d2. Therefore, even the heat exchanger tube 2 to be extracted, which initially had a maximum outer diameter d larger than the hole diameter d2, can be easily extracted from the tube sheet 1.
［発明の効果１
以上のように、本発明による伝熱管の除去方法によれば
、突条のない突条間部分の伝熱管壁に、伝熱管の切断端
に開放されるスロットを軸方向に形成するので、伝熱管
を引き抜く際に、突条のある各部分が半径方向内方に撓
み、寄せ集まった突条のある部分の外径が管板の穴径よ
りも小さくなる。従って、従来の除去方法では解決でき
なかった、穴径より大きい外径寸法を持つリプ付き伝熱
管のような伝熱管の引き抜きを容易に行うことができ、
この種の伝熱管の健全性を適切に評価することができる
。[Effect of the Invention 1 As described above, according to the heat exchanger tube removal method according to the present invention, slots opened at the cut end of the heat exchanger tube are formed in the axial direction in the heat exchanger tube wall in the portion between the ridges without ridges. Therefore, when the heat transfer tube is pulled out, each portion with the protrusions bends inward in the radial direction, and the outer diameter of the portion with the protrusions gathered together becomes smaller than the hole diameter of the tube sheet. Therefore, it is possible to easily pull out heat exchanger tubes such as heat exchanger tubes with lips that have an outer diameter larger than the hole diameter, which could not be solved using conventional removal methods.
The health of this type of heat exchanger tube can be appropriately evaluated.
【図面の簡単な説明】
第１図は、本発明を適用でｂる伝熱管を管板に拡管固定
した状態で示す断面図、第２図は第１図の■−■線断面
図、第３図は、本発明に従って伝熱管の抜管対象部分に
スロットを設けた状態を示す斜視図、第４図は本発明に
よる伝熱管の除去方法の最終ステップを示す概略斜視図
、第５図は、従来の除去方法によって抜管される伝熱管
を管板に拡管固定した状態で示す断面図、第６図は第５
図の■−ｖｒ線断面図、第７図（ａ）、（ｂ）、（ｅ）
及び（ｄ）は、−従来の除去方法の各ステップを説明す
る断面図である。
１・・・管板、２・・・伝熱管、２ａ・・・突条、２ｂ
・・・スロッＬ９．．．．イ？Ｊａ４Ｆ／Ｆ’１手’ｎ
ｗｓシ９Ａ、、、ｍＬ＆！１１＃Ｑ、、。
拡管部又は管端部、４・・・シール溶接部。[Brief Description of the Drawings] Fig. 1 is a sectional view showing a heat exchanger tube to which the present invention is applied in a state where it is expanded and fixed to a tube plate, and Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1. FIG. 3 is a perspective view showing a state in which slots are provided in the portion of the heat transfer tube to be removed according to the present invention, FIG. 4 is a schematic perspective view showing the final step of the heat transfer tube removal method according to the present invention, and FIG. A cross-sectional view showing a heat exchanger tube expanded and fixed to a tube plate after being removed by the conventional removal method, FIG.
7 (a), (b), (e)
and (d) are cross-sectional views illustrating each step of the conventional removal method. DESCRIPTION OF SYMBOLS 1... Tube sheet, 2... Heat exchanger tube, 2a... Projection, 2b
...Slot L9. ．． ．． ．． stomach? Ja4F/F'1 move'n
wsshi9A,,,mL&! 11#Q... Expanded pipe part or pipe end part, 4...Seal weld part.
Claims (1)
され、外面に軸方向突条を円周方向に隔たって有する伝
熱管の除去方法であって、前記シール溶接部を切除し、
前記管板の内側から該伝熱管を切断し、切断された伝熱
管の前記管板側の部分のうち、前記突条のない突条間部
分の伝熱管壁に、前記伝熱管の切断端に開放されるスロ
ットを軸方向に形成し、前記伝熱管の拡管固定部を前記
管板の内側から加熱する、伝熱管の除去方法。A method for removing a heat transfer tube that is expanded and fixed to a thick tube sheet, is seal welded to the tube sheet, and has axial protrusions spaced apart in the circumferential direction on the outer surface, the method comprising: cutting off the seal welded portion;
The heat exchanger tube is cut from the inside of the tube sheet, and the cut end of the heat exchanger tube is attached to the heat exchanger tube wall in the portion between the ridges without the ridges among the portion of the cut heat exchanger tube on the tube sheet side. A method for removing a heat exchanger tube, the method comprising: forming a slot opened in the axial direction, and heating a tube expansion fixing portion of the heat exchanger tube from inside the tube sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5428785A JPH0718531B2 (en) | 1985-03-20 | 1985-03-20 | How to remove the heat transfer tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5428785A JPH0718531B2 (en) | 1985-03-20 | 1985-03-20 | How to remove the heat transfer tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61213404A true JPS61213404A (en) | 1986-09-22 |
| JPH0718531B2 JPH0718531B2 (en) | 1995-03-06 |
Family
ID=12966346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5428785A Expired - Lifetime JPH0718531B2 (en) | 1985-03-20 | 1985-03-20 | How to remove the heat transfer tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0718531B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008267744A (en) * | 2007-04-24 | 2008-11-06 | Toshiba Corp | Heat transfer tube removing method for condenser |
| JP2013543107A (en) * | 2010-08-17 | 2013-11-28 | アレヴァ ゲゼルシャフト ミット ベシュレンクテル ハフツング | Method and apparatus for taking a sample from a steam generator |
| CN109396770A (en) * | 2018-12-20 | 2019-03-01 | 东方电气集团东方锅炉股份有限公司 | A kind of replacing options and special right angle boring cutter of expanded joint bulge U-shaped heat exchanger tube |
| JP2021156702A (en) * | 2020-03-26 | 2021-10-07 | 株式会社神戸製鋼所 | Dismantling method of heat exchanger |
| WO2022004089A1 (en) * | 2020-06-30 | 2022-01-06 | 三菱重工業株式会社 | Method for dismantling steam generator |
| WO2023053555A1 (en) * | 2021-09-29 | 2023-04-06 | 三菱重工業株式会社 | Method for dismantling steam generator |
-
1985
- 1985-03-20 JP JP5428785A patent/JPH0718531B2/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008267744A (en) * | 2007-04-24 | 2008-11-06 | Toshiba Corp | Heat transfer tube removing method for condenser |
| JP2013543107A (en) * | 2010-08-17 | 2013-11-28 | アレヴァ ゲゼルシャフト ミット ベシュレンクテル ハフツング | Method and apparatus for taking a sample from a steam generator |
| CN109396770A (en) * | 2018-12-20 | 2019-03-01 | 东方电气集团东方锅炉股份有限公司 | A kind of replacing options and special right angle boring cutter of expanded joint bulge U-shaped heat exchanger tube |
| CN109396770B (en) * | 2018-12-20 | 2023-10-20 | 东方电气集团东方锅炉股份有限公司 | Replacement method of expansion-connection bulge U-shaped heat exchange tube and special right-angle boring cutter |
| JP2021156702A (en) * | 2020-03-26 | 2021-10-07 | 株式会社神戸製鋼所 | Dismantling method of heat exchanger |
| WO2022004089A1 (en) * | 2020-06-30 | 2022-01-06 | 三菱重工業株式会社 | Method for dismantling steam generator |
| JP2022011879A (en) * | 2020-06-30 | 2022-01-17 | 三菱重工業株式会社 | Decomposition method of steam generator |
| WO2023053555A1 (en) * | 2021-09-29 | 2023-04-06 | 三菱重工業株式会社 | Method for dismantling steam generator |
| EP4180170A4 (en) * | 2021-09-29 | 2024-03-06 | Mitsubishi Heavy Industries, Ltd. | Method for dismantling steam generator |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0718531B2 (en) | 1995-03-06 |
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