JPS62240718A - Local annealing method for large-scaled pressure vessel - Google Patents
Local annealing method for large-scaled pressure vesselInfo
- Publication number
- JPS62240718A JPS62240718A JP8297586A JP8297586A JPS62240718A JP S62240718 A JPS62240718 A JP S62240718A JP 8297586 A JP8297586 A JP 8297586A JP 8297586 A JP8297586 A JP 8297586A JP S62240718 A JPS62240718 A JP S62240718A
- Authority
- JP
- Japan
- Prior art keywords
- pressure vessel
- heat
- heater
- welding
- annealing
- 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
- 238000000137 annealing Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims description 11
- 238000003466 welding Methods 0.000 claims abstract description 12
- 239000011810 insulating material Substances 0.000 claims abstract description 8
- 238000005192 partition Methods 0.000 abstract description 16
- 238000010438 heat treatment Methods 0.000 abstract description 12
- 230000000694 effects Effects 0.000 description 6
- 238000009413 insulation Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 3
- 239000012212 insulator Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000009835 boiling Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Heat Treatment Of Articles (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、大型圧力容器の局部焼鈍方法に係り、特に、
大型圧力容器を分割して輸送し、現地で溶接組立てた後
に、残留応力を除去するのに好適な局部焼鈍方法に関す
るものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a local annealing method for a large pressure vessel, and in particular,
The present invention relates to a local annealing method suitable for removing residual stress after a large pressure vessel is transported in parts and assembled by welding on site.
大型圧力容器の主要部分は、沸騰水型原子カプラントの
原子炉圧力容器を例にとると、第４図に示すように、下
鏡１と複数の円筒胴４〜７が溶接により取付けられ構成
され、支持スカート２で支持されている。下鏡１には、
内部構造を支持するためのシュラウドサポート３が取付
けられる。また、上鏡８はスタッドボルト９により、円
筒胴７のフランジに締付固定される。Taking the reactor pressure vessel of a boiling water nuclear couplant as an example, the main parts of a large pressure vessel consist of a lower mirror 1 and a plurality of cylindrical bodies 4 to 7 attached by welding, as shown in FIG. , supported by a support skirt 2. On the lower mirror 1,
A shroud support 3 is attached to support the internal structure. Further, the upper mirror 8 is tightened and fixed to the flange of the cylindrical body 7 by stud bolts 9.
これらの圧力容器は一般に、工場で溶接組立を行い、工
場に設置されている大型焼鈍炉で、一体焼鈍するのが通
常である。しかしながら、海岸近くに設置される原子カ
プラント以外に、内陸部等にプラントが設置される場合
は、容器の高さや重量等の内陸輸晟制限があり、大型圧
力容器を一体で輸送できないことが多い、この場合は、
大型圧力容器を分割して輸送し、現地で溶接組立を行う
必要がある。Generally, these pressure vessels are assembled by welding at a factory, and are annealed in one piece in a large annealing furnace installed at the factory. However, in addition to nuclear couplers installed near the coast, when plants are installed inland, there are restrictions on inland transportation such as the height and weight of the container, and large pressure vessels often cannot be transported as one unit. ,in this case,
It is necessary to transport the large pressure vessel in parts and assemble it by welding on site.
この現地での溶接組立例を第５図〜第９図に示す。下鏡
１．シュラウドサポート３と一体に溶接された支持スカ
ート２を最初に設定する。次に円筒胴４を段積みし、下
鏡１と溶接する６同様に円筒胴５及び６を段積み溶接し
、最後に第９図に示すように、円［７を段積み溶接し、
組立が完了する。しかる後、残留応力除去のため局部焼
鈍を行う。Examples of this on-site welding assembly are shown in FIGS. 5 to 9. Lower mirror 1. The support skirt 2 welded together with the shroud support 3 is first set up. Next, the cylindrical bodies 4 are stacked and welded to the lower mirror 1. Similarly, the cylindrical bodies 5 and 6 are stacked and welded, and finally, as shown in FIG.
Assembly is complete. After that, local annealing is performed to remove residual stress.
従来の局部焼鈍例を第１０図〜第１１図を用いて説明す
る。溶接部の局部焼鈍は約６−００”Ｃから６５０℃に
加熱保持し、除冷する必要がある。加熱保持時間及び加
熱範囲は胴体の板厚に比例し。An example of conventional local annealing will be explained using FIGS. 10 and 11. For local annealing of welded parts, it is necessary to heat and hold the weld at a temperature of about 6-00"C to 650C and slowly cool it. The heating holding time and heating range are proportional to the thickness of the body.
板厚１７０叫の場合は、加熱保持時間は最小７時間で加
熱範囲は約２０５０ｍである。加熱装置としては、ガス
バーナ方式や電気ヒータ方式等があるが、ここでは、電
気ヒータ方式について述べる。In the case of a plate thickness of 170 mm, the minimum heating retention time is 7 hours and the heating range is about 2050 m. As the heating device, there are a gas burner type, an electric heater type, etc., but the electric heater type will be described here.
電気ヒータ方式は、圧力容器内部に電気ヒータ３８を設
置し、溶接部３９を中心として、熱の遮断隔壁３３を両
側から設置する。圧力容器外部も保温材３５でおおい、
圧力容器加熱範囲そのものを一種の炉として考える方法
である。電気ヒータ３５の表面から放射される赤外線輻
射熱伝導と高温空気による対流熱伝導により、均一な温
度分布を得ることができる。In the electric heater method, an electric heater 38 is installed inside the pressure vessel, and heat-blocking partition walls 33 are installed from both sides around the welding part 39. The outside of the pressure vessel is also covered with heat insulating material 35,
This method considers the pressure vessel heating range itself as a kind of furnace. A uniform temperature distribution can be obtained by the infrared radiation heat conduction radiated from the surface of the electric heater 35 and the convection heat conduction by the high temperature air.
従来の局部焼鈍ｙは第１０〜第１１図に示すように、工
場などで十分な広さが確保されるときは。Conventional local annealing is performed when a sufficient area is secured in a factory, etc., as shown in FIGS. 10 and 11.
通常、圧力容器３２ａと３２ｂを横置にして実施するこ
とが多い。この場合、溶接線３９を中心にして左右に保
温隔壁３３並びに装置支持板３４を設置する。圧力容器
３２ａ、ｂの外側には外側保温材３５を設置し、内部に
電気ヒータ３８を配置保持するために、縦支柱３６及び
横支柱３７を配置する。このように、圧力容器を横置に
して、局部焼鈍を行う場合は、それ程、技術的固型はな
い。Usually, this is often carried out with the pressure vessels 32a and 32b placed horizontally. In this case, heat insulation partition walls 33 and device support plates 34 are installed on the left and right sides of the weld line 39. An outer heat insulating material 35 is installed on the outside of the pressure vessels 32a and 32b, and a vertical support 36 and a horizontal support 37 are provided in order to arrange and hold an electric heater 38 inside. In this way, when local annealing is performed with the pressure vessel placed horizontally, there is not much technical certainty.
しかしながら、第９図のように、場所が狭く、円筒胴の
段積組立を行う場合に、この局部焼鈍方法を適用する時
は、保温隔壁３３の落下防止策を講じる必要があり、圧
力容器上方から作業員が接近するための足場設置も困難
である。そのために、保温隔壁３３の下方に高剛性のサ
ポートを設けなければならない。However, when applying this local annealing method when the space is narrow and cylindrical shells are assembled in stacks as shown in FIG. 9, it is necessary to take measures to prevent the heat-insulating bulkhead 33 from falling. It is also difficult to set up scaffolding for workers to access from the ground. For this purpose, a highly rigid support must be provided below the heat retaining partition wall 33.
また、別の溶接部の局部焼鈍を行う時は、これらの保温
隔壁３３．縦支柱３６．横支柱３７等を一時的に圧力容
器の外に運び出し、下方のサポートの一部を撤去又は増
設する必要があった。これらの再組立にはかなりの時間
を費やし、据付工数が増大する。In addition, when performing local annealing of another welded part, these heat-retaining partition walls 33. Vertical support 36. It was necessary to temporarily move the horizontal support 37 and the like out of the pressure vessel, and to remove or add a portion of the lower support. Reassembling these components takes a considerable amount of time and increases installation man-hours.
そこで本発明の目的は、主に縦型に組立てられる大型圧
力容器の局部焼鈍用機材の組立を容易にし、圧力容器上
方から作業員が楽に接近し退出でき、前記局部焼鈍用機
材の移動も短時間にできる大型圧力容器の局部焼鈍方法
を提供することである。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to facilitate the assembly of local annealing equipment for large pressure vessels that are mainly assembled vertically, to allow workers to easily approach and exit from above the pressure vessel, and to shorten the movement of the local annealing equipment. It is an object of the present invention to provide a local annealing method for a large pressure vessel that can be performed in a short time.
本発明は、上記目的を達成するために、圧力容器の溶接
部に沿ったヒータを取付け、このヒータをり、ング状保
温隔壁で用い、圧力容器壁の前記ヒータ取付部分の反対
側を保温材で覆い、これら保温材で覆われた部分のみを
加熱焼鈍する大型圧力容器の局部焼鈍方法を提案するも
のである。In order to achieve the above object, the present invention installs a heater along a welded part of a pressure vessel, uses this heater in a ring-shaped heat-insulating bulkhead, and attaches a heat-insulating material to the opposite side of the pressure vessel wall from where the heater is attached. This paper proposes a local annealing method for large pressure vessels in which only the parts covered with these heat insulating materials are heated and annealed.
このように１本発明に用いる加熱及び保温部材は圧力容
器壁に沿った狭い部分を占めるのみであるので、縦型圧
力容器の場合、はぼ中央部に設置される作業用足場と干
渉することがなく、ひとつの溶接部の焼鈍が終了し次の
焼鈍位置に移動することも容易である。As described above, since the heating and heat-insulating member used in the present invention only occupies a narrow portion along the wall of the pressure vessel, in the case of a vertical pressure vessel, it may interfere with the work scaffold installed in the center of the vessel. It is easy to move to the next annealing position after the annealing of one weld is completed.
以下、本発明の一実施例を第１図から第３図までの各回
にもとづいて説明する。An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.
圧力容器内部に固定足場２９を設置固定する。A fixed scaffold 29 is installed and fixed inside the pressure vessel.
これには５作業員が出入りするための階段３２及び局部
焼鈍用機材を組立てるための作業足場３゜が設けられて
いる。This is provided with stairs 32 for five workers to enter and exit, and a work scaffold 3° for assembling equipment for local annealing.
第１図において、円筒胴７と円ＷＪ胴６との溶接部１０
を中心として、内側に焼鈍加熱用電気ヒータ１６を固定
するための形枠１１，１２，１３を設置する。電気ヒー
タ１６は針金１７により固定される。この形枠１１〜１
３の周りにリング状保温隔壁Ｌ ８ ａ ” ａ ＆固
定する。この固定のために、帯板１４．１５を形枠１１
〜１３に溶接固定し。In FIG. 1, a welded portion 10 between the cylindrical body 7 and the circular WJ body 6
Frames 11, 12, and 13 for fixing the electric heater 16 for annealing heating are installed inside the center. The electric heater 16 is fixed by a wire 17. This frame 11-1
A ring-shaped heat-insulating partition L 8 a ” a & is fixed around 3. For this fixing, strips 14 and 15 are attached to the form 11
~13 welded and fixed.
クリップ１９を使用する。これらの構造物は、上下方向
にスライド可能である。ただし、局部焼鈍中は、リング
状保湿隔壁１８ ａ ＝ ｃの落下を防止するため、サ
ポート２６により固定される。サポート２６は、ボルト
２７により固定足場２９に固定される。円筒胴６，７の
外側には外側保温材２２、さらに、放熱防止のため内外
保温材２０〜２４を設置する。焼鈍加熱範囲外の部分は
熱伝導で放熱しやすいので、バックアップとして、補助
ヒータ２８を併用する場合もある。円筒１７１７６．７
の焼鈍中の温度管理をするために、熱電対２５も設置す
る。Use clip 19. These structures are vertically slidable. However, during local annealing, the ring-shaped moisturizing partition wall 18 a = c is fixed by a support 26 to prevent it from falling. The support 26 is fixed to a fixed scaffold 29 by bolts 27. Outside the cylindrical bodies 6 and 7, an outer heat insulator 22 is installed, and furthermore, inner and outer heat insulators 20 to 24 are installed to prevent heat radiation. Since the portion outside the annealing heating range tends to radiate heat by thermal conduction, the auxiliary heater 28 may be used as a backup. Cylinder 17176.7
A thermocouple 25 is also installed to control the temperature during annealing.
上記のように、リング状保温隔壁１８ ａ ” ｃは固
定足場２９の外側にあるため、据付スペースが十分にあ
り、かつ１作業足場３０から容易に接近できるので、据
付作業性が極めてよい。リング状保温隔壁１８ａの内部
には電気ヒータ１６を溶接部１０ならびに加熱範囲の円
筒胴６，７に相対するように円周状に配置する。As mentioned above, since the ring-shaped heat-insulating partition wall 18a''c is located outside the fixed scaffold 29, there is sufficient installation space and it can be easily approached from the first work scaffold 30, so installation workability is extremely high. Electric heaters 16 are disposed in a circumferential manner inside the shaped heat-retaining partition wall 18a so as to face the welding part 10 and the cylindrical bodies 6 and 7 in the heating range.
電気ヒータ１６の配置を第３図に示す。このように配置
することにより、電気ヒータ１６から放射される赤外線
輻射熱は、直接、圧力容器の円筒胴６．７に伝導される
ので、熱効率が極めてよい。The arrangement of the electric heater 16 is shown in FIG. With this arrangement, the infrared radiant heat emitted from the electric heater 16 is directly conducted to the cylindrical body 6.7 of the pressure vessel, resulting in extremely high thermal efficiency.
そのために、リング状保温隔壁１８ａは円筒胴６゜７へ
の対流熱伝導効果を考慮して、可能な限り接近させる。For this purpose, the ring-shaped heat-insulating partition wall 18a is placed as close as possible to the cylindrical body 6.degree. 7, taking into account the effect of convection heat conduction.
このようにすると、リング状保温隔壁１８ ａ ” ｃ
内の体積を小さくできる。このことは電気ヒータ１６の
一数を減らすことにつながり、さらに入熱量も減らせる
から、保温機材及び電力式の節約となる。In this way, the ring-shaped heat-insulating partition wall 18 a ” c
The internal volume can be reduced. This leads to a reduction in the number of electric heaters 16 and also reduces the amount of heat input, resulting in savings in heat insulation equipment and electric power.
次に、第２図において、円筒胴６と円筒胴５との溶接部
に焼鈍炉を移動させる場合、リング状保温隔壁１８ａ＝
ｃは固定足場２９の外側にあるので１足場と干渉せず、
下側へ容易に移動可能である。Next, in FIG. 2, when moving the annealing furnace to the welded part between the cylindrical shell 6 and the cylindrical shell 5, the ring-shaped heat-retaining partition wall 18a=
Since c is outside the fixed scaffolding 29, it does not interfere with the first scaffolding,
It can be easily moved downward.
従って、従来例の焼鈍炉に比べて、組立及び移動がはる
かに容易で、工数低減効果が大きい。Therefore, compared to conventional annealing furnaces, assembly and movement are much easier, and the effect of reducing man-hours is significant.
ここでは、縦型に組立設置される圧力容器に本発明方法
を適用する例を述べたが、横置きで組立てる場合にも適
用できることは勿論である。Here, an example has been described in which the method of the present invention is applied to a pressure vessel that is assembled and installed vertically, but it is of course also applicable to a case where it is assembled horizontally.
また１、ヒータを容器壁外側に設置してもよいことは明
らかであろう。It will also be clear that the heater may be installed outside the wall of the container.
以上の如く、本発明によれば、リング状保温隔壁を用い
ることにより、固定足場を利用して、保温隔壁の据付が
可能なので１作業性、安全性が極めて良く、かつ、保温
隔壁の組立と移動が容易であり、工数低減効果が大きい
。As described above, according to the present invention, by using the ring-shaped heat-insulating bulkhead, it is possible to install the heat-insulating bulkhead using a fixed scaffold. It is easy to move and has a great effect on reducing man-hours.
また、保温隔壁をリング状とすることにより。Also, by making the heat insulation partition wall ring-shaped.
熱効率が高まり、保温隔壁の体積を減少させ、がっ、入
熱量を減らして、保温機材ならびに電力式を節約できる
効果がある。It has the effect of increasing thermal efficiency, reducing the volume of the heat insulation partition, reducing the amount of heat input, and saving on heat insulation equipment and electric power.
第１図は本発明の一実施例を示す局部焼鈍炉の縦断面図
、第２図は本発明の局部焼鈍実施状況を示す全体縦ＦＭ
面図、第３図は第２図の１−１矢視図、第４図から第９
図は分割容器の現地組立例を示す図、第１０図は従来の
局部焼鈍炉を示す断面図、第１１図は第１０図の■−■
矢視図である。
１６・・・電気ヒータ、１８・・・リング状保温隔壁。
２２・・・外側保温材、２９・・・固定足場、３ｏ・・
・作業足場、３１・・・階段。Fig. 1 is a vertical cross-sectional view of a local annealing furnace showing an embodiment of the present invention, and Fig. 2 is an overall vertical FM showing the implementation status of local annealing of the present invention.
The top view, Figure 3 is the 1-1 arrow view of Figure 2, and Figures 4 to 9.
The figure shows an example of on-site assembly of a divided container, Figure 10 is a cross-sectional view of a conventional local annealing furnace, and Figure 11 is from ■-■ in Figure 10.
It is an arrow view. 16... Electric heater, 18... Ring-shaped heat insulation partition. 22...Outer heat insulation material, 29...Fixed scaffolding, 3o...
・Work scaffolding, 31...stairs.
Claims (1)
圧力容器の溶接部周辺の残留応力を除去するための大型
圧力容器の局部焼鈍方法において、前記溶接部に沿つて
ヒータを取付け、このヒータをリング状保温隔壁で覆い
、前記圧力容器壁の前記ヒータ取付部分の反対側を保温
材で覆い、これら保温材で覆われた部分のみを加熱焼鈍
することを特徴とする大型圧力容器の局部焼鈍方法。1. In a method of local annealing of a large pressure vessel for removing residual stress around the welded part of a large pressure vessel assembled by combining and welding a plurality of divided parts, a heater is installed along the welded part, and this heater is covered with a ring-shaped heat-insulating bulkhead, the opposite side of the pressure vessel wall to the heater attachment part is covered with a heat-insulating material, and only the portion covered with the heat-insulating material is heated and annealed. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8297586A JPS62240718A (en) | 1986-04-10 | 1986-04-10 | Local annealing method for large-scaled pressure vessel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8297586A JPS62240718A (en) | 1986-04-10 | 1986-04-10 | Local annealing method for large-scaled pressure vessel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62240718A true JPS62240718A (en) | 1987-10-21 |
| JPH0372135B2 JPH0372135B2 (en) | 1991-11-15 |
Family
ID=13789215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8297586A Granted JPS62240718A (en) | 1986-04-10 | 1986-04-10 | Local annealing method for large-scaled pressure vessel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62240718A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150283643A1 (en) * | 2011-12-20 | 2015-10-08 | Patrik Dahlman | Method and Component |
| CN109321721A (en) * | 2018-09-25 | 2019-02-12 | 常州旷达威德机械有限公司 | A kind of the normalizing processing method and hoisting tool of flat bottom cover |
-
1986
- 1986-04-10 JP JP8297586A patent/JPS62240718A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150283643A1 (en) * | 2011-12-20 | 2015-10-08 | Patrik Dahlman | Method and Component |
| CN109321721A (en) * | 2018-09-25 | 2019-02-12 | 常州旷达威德机械有限公司 | A kind of the normalizing processing method and hoisting tool of flat bottom cover |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0372135B2 (en) | 1991-11-15 |
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