JP2003285194A - Butt welding method and structure of butt welding, handling method for liquid containing easily polymerizable substance and handling apparatus used for the same - Google Patents
Butt welding method and structure of butt welding, handling method for liquid containing easily polymerizable substance and handling apparatus used for the sameInfo
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- JP2003285194A JP2003285194A JP2002088202A JP2002088202A JP2003285194A JP 2003285194 A JP2003285194 A JP 2003285194A JP 2002088202 A JP2002088202 A JP 2002088202A JP 2002088202 A JP2002088202 A JP 2002088202A JP 2003285194 A JP2003285194 A JP 2003285194A
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- JP
- Japan
- Prior art keywords
- polymerizable substance
- easily polymerizable
- liquid containing
- welding
- handling
- Prior art date
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- Butt Welding And Welding Of Specific Article (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、突き合せ溶接によ
って配管を接続する突き合せ溶接方法および突き合せ溶
接構造、易重合性物質を含む液体の取扱方法および易重
合性物質を含む液体の取扱装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a butt welding method and a butt welding structure for connecting pipes by butt welding, a method for handling a liquid containing an easily polymerizable substance, and an apparatus for handling a liquid containing an easily polymerizable substance. Regarding
【０００２】[0002]
【従来の技術】工場内などに設けられた流体の輸送に用
いられる配管は、経路が様々な方向に及んだり、異径の
配管が多く接続されている。そのため、配管同士の接続
や、配管と各種機器との接続には、突き合せ溶接が実施
されることが多い。図２は、従来の突き合せ溶接による
配管の接続部の構造を示す概略断面図である。配管１、
１を突き合せ溶接するには、まず、配管１、１の端部１
ａ、１ａに、図２に示すようなＶ形の開先加工を施し
て、配管１、１の突き合せ部にＶ形の溝２を形成する。
同時に、この開先加工部には、溶融した溶接棒を流し込
むために、溝２の先端部にルート部３も設ける。通常、
このルート部３の幅、すなわちルート間隔ｄは、１．６
〜４．８ｍｍ程度とされている。次いで、配管１、１の
突き合せ部の溝２およびルート部３に、溶接棒を溶かし
ながら流し込んで、配管１、１が溶接材４で接続され
る。2. Description of the Related Art Pipes used for transportation of fluids provided in factories or the like have various routes and various pipes of different diameters are connected. Therefore, butt welding is often performed for connecting pipes to each other or connecting pipes to various devices. FIG. 2 is a schematic sectional view showing a structure of a connecting portion of a pipe by conventional butt welding. Pipe 1,
To butt-weld No. 1, first, the end 1 of the pipe 1, 1
V-shaped groove processing as shown in FIG. 2 is performed on a and 1a to form a V-shaped groove 2 at the abutting portion of the pipes 1 and 1.
At the same time, a root portion 3 is also provided at the tip of the groove 2 for pouring a molten welding rod into the groove processing portion. Normal,
The width of the root portion 3, that is, the root interval d is 1.6.
It is set to about 4.8 mm. Next, the welding rod is melted and poured into the groove 2 and the root portion 3 of the abutting portion of the pipes 1 and 1, and the pipes 1 and 1 are connected by the welding material 4.
【０００３】[0003]
【発明が解決しようとする課題】このような従来の溶接
方法では、ルート間隔ｄが広いため、配管１の内面に溶
接盛りが、突起物として残留する。そこで、この溶接盛
りを除去するために、配管１の内面に、グラインダー仕
上げまたはバフ仕上げを施すことがある。しかし、配管
１の径が小さい場合や、配管１の接続部の形状が複雑な
場合など、溶接箇所によっては、グラインダー仕上げや
バフ仕上げを施すことが出来ないことが多かった。In such a conventional welding method, since the root distance d is wide, the weld deposit remains on the inner surface of the pipe 1 as a protrusion. Therefore, in order to remove this weld deposit, the inner surface of the pipe 1 may be subjected to a grinder finish or a buff finish. However, when the diameter of the pipe 1 is small, or when the shape of the connection portion of the pipe 1 is complicated, it is often impossible to perform the grinder finish or the buff finish depending on the welding location.
【０００４】このように、配管１の内面に、溶接盛りに
よる平滑でない箇所が存在すると、配管１内を流れる流
体の種類によっては、不具合を生じることがあった。例
えば、配管１内を流れる流体が易重合性物質を含む液体
である場合、溶接盛りを重合の成長点として易重合性物
質の重合物が多量に生成したり、易重合性物質が溶接盛
りの近傍に長期間滞留すると、易重合性物質が重合し
て、重合物が生成することがあった。このような重合物
の生成によって、流体そのものが凝固し、しばしば配管
１の内部が詰まって、流体の輸送が不能になることがあ
った。As described above, if there is a non-smooth portion due to the weld deposit on the inner surface of the pipe 1, a problem may occur depending on the type of fluid flowing in the pipe 1. For example, when the fluid flowing in the pipe 1 is a liquid containing an easily polymerizable substance, a large amount of a polymer of the easily polymerizable substance is generated with the weld deposit as a growth point of polymerization, or the easily polymerizable substance is the weld deposit. When it stayed in the vicinity for a long period of time, the easily polymerizable substance was sometimes polymerized to form a polymer. Due to the formation of such a polymer, the fluid itself is solidified, and the inside of the pipe 1 is often clogged, which makes it impossible to transport the fluid.
【０００５】このように流体の輸送が不能となることを
回避するために、易重合性物質には重合防止剤を添加
し、状況に応じて、重合防止剤の添加量をさらに増加す
る方法が用いられてきた。しかしながら、易重合性物質
の重合防止のために、重合防止剤を添加もしくは増量す
ることは、経済的に不利であり、易重合性物質の組成が
変更されてしまうことがあった。In order to avoid the inability to transport the fluid as described above, there is a method of adding a polymerization inhibitor to the easily polymerizable substance and further increasing the amount of the polymerization inhibitor added depending on the situation. Has been used. However, it is economically disadvantageous to add or increase the amount of the polymerization inhibitor to prevent the polymerization of the easily polymerizable substance, and the composition of the easily polymerizable substance may be changed.
【０００６】本発明は、前記事情に鑑みてなされたもの
で、溶接盛りを重合の成長点として易重合性物質の重合
物が多量に生成したり、易重合性物質が溶接盛りの近傍
に長期間滞留してその重合物が生成することを防止する
突き合せ溶接方法および突き合せ溶接構造、易重合性物
質を含む液体の取扱方法および易重合性物質を含む液体
の取扱装置を提供することを課題とする。The present invention has been made in view of the above circumstances, in which a large amount of a polymer of an easily polymerizable substance is generated with the weld deposit as a growth point of polymerization, and the easily polymerizable substance is long in the vicinity of the weld deposit. To provide a butt welding method and a butt welding structure that prevent the polymer from being retained for a certain period of time, a butt welding structure, a method of handling a liquid containing an easily polymerizable substance, and an apparatus for handling a liquid containing an easily polymerizable substance. It is an issue.
【０００７】[0007]
【課題を解決するための手段】前記課題は、配管を突き
合せて溶接する突き合せ溶接方法において、前記配管の
端部に開先加工を施して溶接用ルート部を形成し、該溶
接用ルート部のルート間隔を１．０ｍｍ未満とする突き
合せ溶接方法およびその突き合せ溶接方法を採用した易
重合性物質を含む液体の取扱方法によって解決できる。
上記易重合性物質を含む液体の取扱方法においては、前
記突き合せ溶接が前記配管と易重合性物質を含む液体を
取り扱う機器とを接続したものとすることができる。前
記易重合性物質としては、（メタ）アクリル酸、（メ
タ）アクリル酸エステル、（メタ）アクロレインから選
ばれる少なくとも１種類以上である場合にも適用でき
る。前記課題は、配管を突き合せて溶接によって接続す
る突き合せ溶接構造において、前記配管の端部に形成さ
れた溶接用ルート部のルート間隔が１．０ｍｍ未満であ
る突き合せ溶接構造およびその突き合せ溶接構造を採用
した易重合性物質を含む液体の取扱装置によって解決で
きる。上記易重合性物質を含む液体の取扱装置において
は、前記突き合せ溶接構造が、前記易重合性物質を含む
液体を輸送する配管と易重合性物質を含む液体を取り扱
う機器とを接続しているものとすることもできる。In the butt welding method of butt-welding pipes, the end portions of the pipes are groove-processed to form a welding root portion, and the welding roots are formed. The problem can be solved by a butt welding method in which the root interval of the parts is less than 1.0 mm and a method of handling a liquid containing an easily polymerizable substance using the butt welding method.
In the above method of handling a liquid containing an easily polymerizable substance, the butt welding may connect the pipe to a device that handles a liquid containing an easily polymerizable substance. The easily polymerizable substance can be applied even when it is at least one selected from (meth) acrylic acid, (meth) acrylic acid ester, and (meth) acrolein. The above problem is a butt welding structure in which pipes are butted and connected to each other by welding, and a butt welding structure in which a root interval of a welding root portion formed at an end of the pipe is less than 1.0 mm and the butt welding structure. This can be solved by a liquid handling device that employs a welded structure and that contains an easily polymerizable substance. In the liquid handling device containing the easily polymerizable substance, the butt welding structure connects a pipe for transporting the liquid containing the easily polymerizable substance and a device for handling the liquid containing the easily polymerizable substance. It can also be one.
【０００８】[0008]
【発明の実施の形態】以下、本発明を詳しく説明する。
図１は、本発明の突き合せ溶接構造の一例を示す概略断
面図である。配管１１、１１を突き合せ溶接するには、
まず、配管１１、１１の端部１１ａ、１１ａに、図１に
示すようなＶ形の開先加工を施して、配管１１、１１の
突き合せ部にＶ形の溝１２を形成する。同時に、この開
先加工部には、溶融した溶接棒を流し込むためのルート
部１３も設ける。本発明の突き合せ溶接構造では、この
ルート部１３の幅、すなわちルート間隔Ｄを１．０ｍｍ
未満となっている。次いで、配管１１、１１の突き合せ
部の溝１２およびルート部１３に、溶接棒を溶かしなが
ら流し込んで、配管１１、１１が溶融した溶接棒が固化
した溶接材１４で接続される。BEST MODE FOR CARRYING OUT THE INVENTION The present invention is described in detail below.
FIG. 1 is a schematic cross-sectional view showing an example of the butt welding structure of the present invention. To butt weld the pipes 11, 11,
First, V-shaped groove processing as shown in FIG. 1 is applied to the end portions 11a and 11a of the pipes 11 and 11 to form the V-shaped groove 12 at the abutting portion of the pipes 11 and 11. At the same time, a root portion 13 for pouring a molten welding rod is also provided in this groove processing portion. In the butt welding structure of the present invention, the width of the root portion 13, that is, the root distance D is 1.0 mm.
It is less than. Then, the welding rod is melted and poured into the groove 12 and the root portion 13 of the abutting portion of the pipes 11 and 11, and the welding rods in which the pipes 11 and 11 are melted are connected by the solidified welding material 14.
【０００９】本発明の突き合せ溶接構造では、配管１
１、１１の接続部において、ルート間隔Ｄが１．０ｍｍ
未満となっている。このように、配管１１、１１の突き
合せ溶接において、ルート間隔Ｄを狭くすることによ
り、配管１１の内面に溶接盛りが突起物として残留する
ことなく、配管１１、１１を接続することができる。し
たがって、溶接後の配管１１の内面は平滑な面となり、
配管１１、１１の接続部には流体の滞留する部分が存在
しない。よって、配管１１、１１の溶接後に、この接続
部を平滑な面とするために、必ずしもグラインダー仕上
げやバフ仕上げを施す必要がない。一方、ルート間隔Ｄ
を１．０ｍｍ以上とすると、配管１１の内面に溶接盛り
が突起物として残留し、配管１１内を流れる流体が易重
合性物質を含む液体である場合、溶接盛りを重合の成長
点として易重合性物質の重合物が多量に生成したり、易
重合性物質が溶接盛りの近傍に長期間滞留し、易重合性
物質が重合して、重合物が生成する。In the butt welding structure of the present invention, the pipe 1
At the connection part of 1 and 11, the route interval D is 1.0 mm
It is less than. As described above, in the butt welding of the pipes 11 and 11, by narrowing the route interval D, the pipes 11 and 11 can be connected without the weld deposit remaining on the inner surface of the pipe 11 as a protrusion. Therefore, the inner surface of the pipe 11 after welding becomes a smooth surface,
There is no portion where the fluid stays in the connection portion of the pipes 11, 11. Therefore, after welding the pipes 11 and 11, it is not always necessary to perform the grinder finish or the buff finish in order to make the connection portion have a smooth surface. On the other hand, the route interval D
Is 1.0 mm or more, the weld deposit remains on the inner surface of the pipe 11 as a protrusion, and when the fluid flowing in the pipe 11 is a liquid containing an easily polymerizable substance, the weld deposit is used as a growth point of polymerization to facilitate polymerization. A large amount of the polymerizable substance is generated, or the easily polymerizable substance stays in the vicinity of the weld deposit for a long time, and the easily polymerizable substance is polymerized to generate a polymer.
【００１０】本発明の突き合せ溶接構造は、各種の流体
を輸送する配管の接続に用いることができるが、突き合
せ溶接による接続部の内部における流体の滞留防止の必
要性から、主に、液体の配管に好ましく適用することが
できる。特に、本発明の突き合せ溶接構造を、易重合性
物質を含む液体の輸送用の配管に適用すれば、配管の接
続部において、易重合性物質の重合を効果的に防止する
ことができる。The butt-welding structure of the present invention can be used to connect pipes for transporting various fluids. However, since it is necessary to prevent fluid from staying inside the connecting portion by butt-welding, the liquid is mainly used. It can be preferably applied to the above piping. In particular, when the butt-welding structure of the present invention is applied to a pipe for transporting a liquid containing an easily polymerizable substance, polymerization of the easily polymerizable substance can be effectively prevented at a connecting portion of the pipe.
【００１１】ところで、配管１１、１１の接続部内にお
ける易重合性物質を含む液体の経時変化、すなわち、配
管１１内を輸送する易重合性物質の重合は、配管１１、
１１の接続部に、溶接盛りからなる易重合性物質を含む
液体の滞留部分が存在し、易重合性物質を含む液体がこ
の滞留部分に長期間滞留することによって起こる現象で
ある。したがって、易重合性物質を含む液体の経時変化
を防止するには、易重合性物質を含む液体を滞留させず
に、常に、輸送させておく必要がある。よって、本発明
の突き合せ溶接構造のように、配管１１、１１の接続部
において、易重合性物質を含む液体の滞留部分が存在し
ない構造とすれば、易重合性物質を含む液体が常に円滑
に輸送するから、易重合性物質を含む液体が滞留するこ
とがない。その結果として、配管１１、１１の接続部内
を輸送する易重合性物質の重合物の生成によって、この
接続部の内部が詰まり、易重合性物質を含む液体の輸送
が不能となることがない。By the way, the change with time of the liquid containing the easily polymerizable substance in the connection portion of the pipes 11, 11, that is, the polymerization of the easily polymerizable substance transported in the pipe 11, is caused by the pipe 11,
This is a phenomenon caused by the presence of the liquid containing the easily polymerizable substance, which is made of a weld deposit, at the connecting portion 11 and the liquid containing the easily polymerizable substance is retained in the remaining region for a long period of time. Therefore, in order to prevent the liquid containing the easily polymerizable substance from changing with time, it is necessary to transport the liquid containing the easily polymerizable substance without retaining it. Therefore, as in the butt-welding structure of the present invention, when the connection portion of the pipes 11 and 11 has a structure in which there is no retained portion of the liquid containing the easily polymerizable substance, the liquid containing the easily polymerizable substance is always smooth. The liquid containing the easily polymerizable substance does not stay because it is transported to the. As a result, the inside of the connection portion is not clogged due to the formation of a polymerized product of the easily polymerizable substance that is transported in the connection portion of the pipes 11 and 11, and the liquid containing the easily polymerizable substance cannot be transported.
【００１２】また、本発明の易重合性物質を含む液体の
取扱装置は、上述の本発明の突き合せ溶接構造を用い
て、易重合性物質を含む液体の輸送用の配管を接続する
ものである。本発明の易重合性物質を含む液体の取扱装
置においても、ルート部のルート間隔を１．０ｍｍ未満
とする。さらに、本発明の易重合性物質を含む液体の取
扱装置は、本発明の突き合せ溶接構造を用いて、易重合
性物質を含む液体を取り扱うタンク、熱交換器、ポン
プ、ノズルなどの各種機器と、易重合性物質を含む液体
の輸送用の配管とを接続するものである。このように、
本発明の易重合性物質を含む液体の取扱装置を、本発明
の突き合せ溶接構造を用いて、易重合性物質を含む液体
の輸送用の配管同士を接続した構造、あるいは、易重合
性物質を含む液体の輸送用の配管と各種機器とを接続し
た構造とすれば、配管同士の接続部や、配管と各種機器
との接続部において、易重合性物質を含む液体の輸送が
円滑に行なわれ、易重合性物質を含む液体が滞留するこ
とがない。Further, the liquid handling apparatus containing the easily polymerizable substance of the present invention uses the above-described butt welding structure of the present invention to connect a pipe for transporting the liquid containing the easily polymerizable substance. is there. Also in the liquid handling device containing the easily polymerizable substance of the present invention, the root interval of the root part is less than 1.0 mm. Further, the liquid handling device containing the easily polymerizable substance of the present invention uses the butt-welding structure of the present invention, and various devices such as a tank, a heat exchanger, a pump and a nozzle for handling the liquid containing the easily polymerizable substance. And a pipe for transporting the liquid containing the easily polymerizable substance. in this way,
A device for handling a liquid containing an easily polymerizable substance according to the present invention has a structure in which pipes for transporting a liquid containing an easily polymerizable substance are connected to each other by using the butt welding structure according to the present invention, or an easily polymerizable substance. With a structure in which a pipe for transporting a liquid containing liquid is connected to various devices, the liquid containing the easily polymerizable substance is smoothly transported at the connection part between the pipes and the connection part between the pipe and various devices. Therefore, the liquid containing the easily polymerizable substance does not stay.
【００１３】したがって、本発明の易重合性物質を含む
液体の取扱装置は、本発明の突き合せ溶接構造と同様
に、主に易重合性物質を含む液体の輸送用の配管に好ま
しく適用することができる。よって、本発明の易重合性
物質を含む液体の取扱装置では、易重合性物質を含む液
体の重合を防止するために、重合防止剤を過剰に添加す
る必要がなくなる。また、配管の接続部に残留した溶接
盛りを除去するために、配管の内面に、必ずしもグライ
ンダー仕上げやバフ仕上げを施す必要がない。よって、
コストの増加を抑制することができる。Therefore, similarly to the butt-welding structure of the present invention, the liquid handling device of the present invention containing a readily polymerizable substance is preferably applied mainly to piping for transporting a liquid mainly containing an easily polymerizable substance. You can Therefore, in the apparatus for handling a liquid containing an easily polymerizable substance of the present invention, it is not necessary to add an excessive amount of a polymerization inhibitor in order to prevent polymerization of the liquid containing an easily polymerizable substance. Further, in order to remove the weld deposit remaining at the connection portion of the pipe, it is not always necessary to grind or buff the inner surface of the pipe. Therefore,
It is possible to suppress an increase in cost.
【００１４】また、本発明の突き合せ溶接構造、また
は、本発明の易重合性物質を含む液体の取扱装置で取り
扱われる易重合性物質としては、（メタ）アクリル酸な
どの不飽和カルボン酸類、メチル（メタ）アクリレー
ト、ノルマルブチル（メタ）アクリレート、イソブチル
（メタ）アクリレート、ターシャリーブチル（メタ）ア
クリレート、２−エチルヘキシル（メタ）アクリレー
ト、ラウリル（メタ）アクリレート、トリデシル（メ
タ）アクリレート、ステアリル（メタ）アクリレートな
どのアルキル（メタ）アクリレート類、シクロヘキシル
（メタ）アクリレート、ベンジル（メタ）アクリレー
ト、イソボルニル（メタ）アクリレート、グリシジル
（メタ）アクリレート、テトラヒドロフルフリル、アリ
ル（メタ）アクリレートなどの脂環・芳香環・複素環お
よびビニル基含有（メタ）アクリレート類、ヒドロキシ
エチル（メタ）アクリレート、ヒドロキシプロピル（メ
タ）アクリレート、２−メトキシエチル（メタ）アクリ
レート、２−エトキシエチル（メタ）アクリレートなど
のヒドロキシルまたはアルコキシル基含有（メタ）アク
リレート類、エチレングリコールジ（メタ）アクリレー
ト、トリエチレングリコールジ（メタ）アクリレート、
１，３−ブチレングリコールジ（メタ）アクリレート、
１，６−ヘキサンジオールジ（メタ）アクリレート、ポ
リプロピレングリコールジ（メタ）アクリレート、トリ
メチロールプロパントリ（メタ）アクリレートなどの多
官能（メタ）アクリレート類、フタル酸２−（メタ）ア
クロイルオキシエチル、ヘキサヒドロフタル酸２−（メ
タ）アクロイルオキシエチルなどのカルボン酸含有（メ
タ）アクリレート類、ジメチルアミノエチル（メタ）ア
クリレート、ジメチルアミノエチル（メタ）アクリレー
トメチルクロライド塩、ジメチルアミノエチル（メタ）
アクリレートベンジルクロライド塩、ジエチルアミノエ
チル（メタ）アクリレートなどのジアルキルアミノエチ
ル（メタ）アクリレート類、トリフルオロエチル（メ
タ）アクリレート、ヘプタデカフルオロデシル（メタ）
アクリレートなどのハロゲン化アルキル（メタ）アクリ
レート類、（メタ）アクロレインなどの不飽和アルデヒ
ド類が挙げられる。本発明の突き合せ溶接構造、およ
び、本発明の易重合性物質を含む液体の取扱装置は、特
に、（メタ）アクリル酸を含む液体の輸送に好適に用い
られる。なお、「（メタ）アクリル」とは、慣用される
ように、「アクリル」および／または「メタクリル」を
意味する。Further, as the easily polymerizable substance handled by the butt-welding structure of the present invention or the liquid handling device containing the easily polymerizable substance of the present invention, unsaturated carboxylic acids such as (meth) acrylic acid, Methyl (meth) acrylate, normal butyl (meth) acrylate, isobutyl (meth) acrylate, tertiary butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, tridecyl (meth) acrylate, stearyl (meth) ) Alkyl (meth) acrylates such as acrylate, cyclohexyl (meth) acrylate, benzyl (meth) acrylate, isobornyl (meth) acrylate, glycidyl (meth) acrylate, tetrahydrofurfuryl, allyl (meth) acrylate, etc. Ring / aromatic ring / heterocycle and vinyl group-containing (meth) acrylates, hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, 2-methoxyethyl (meth) acrylate, 2-ethoxyethyl (meth) acrylate, etc. Hydroxyl or alkoxyl group-containing (meth) acrylates, ethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate,
1,3-butylene glycol di (meth) acrylate,
Polyfunctional (meth) acrylates such as 1,6-hexanediol di (meth) acrylate, polypropylene glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, 2- (meth) acroyloxyethyl phthalate, Carboxylic acid-containing (meth) acrylates such as 2- (meth) acroyloxyethyl hexahydrophthalate, dimethylaminoethyl (meth) acrylate, dimethylaminoethyl (meth) acrylate methyl chloride salt, dimethylaminoethyl (meth)
Acrylate benzyl chloride salt, dialkylaminoethyl (meth) acrylates such as diethylaminoethyl (meth) acrylate, trifluoroethyl (meth) acrylate, heptadecafluorodecyl (meth)
Examples thereof include halogenated alkyl (meth) acrylates such as acrylates and unsaturated aldehydes such as (meth) acrolein. The butt-welding structure of the present invention and the liquid handling device containing the easily polymerizable substance of the present invention are particularly preferably used for transporting a liquid containing (meth) acrylic acid. In addition, "(meth) acrylic" means "acrylic" and / or "methacrylic" as conventionally used.
【００１５】[0015]
【実施例】以下、具体的な実施例を示して本発明の効果
を明らかにする。EXAMPLES The effects of the present invention will be clarified below with reference to specific examples.
【００１６】（実施例１）純度９９質量％の粗メタクリ
ル酸に、重合防止剤として、フェノチアジンを５ｍｇ／
Ｌと、ハイドロキノン１０ｍｇ／Ｌとを加えた液を、温
度３５℃で、内径５２ｍｍの円筒形配管内を流量１０ｍ
3／ｈ、流速１．３ｍ／ｓで流通させた。この円筒形配
管には、突き合せ溶接された接続部があり、この接続部
においては、溶接用ルート部のルート間隔を設けずに、
開先加工を施した配管を直に突き合せて溶接した。この
ような形態で、約２年間連続で配管内にメタクリル酸を
流通させた。メタクリル酸の流通終了後、突き合せ溶接
による配管の接続部内を検査したところ、メタクリル酸
の重合物は存在しておらず、流通中も配管の詰まりは観
測されなかった。Example 1 In crude methacrylic acid having a purity of 99% by mass, 5 mg / phenothiazine was added as a polymerization inhibitor.
The liquid containing L and 10 mg / L of hydroquinone was added at a temperature of 35 ° C. and a flow rate of 10 m in a cylindrical pipe having an inner diameter of 52 mm.
It was circulated at a flow rate of 3 m / h and a flow rate of 1.3 m / s. This cylindrical pipe has a butt-welded connection part, and at this connection part, without providing the root interval of the welding root part,
The grooved pipes were directly butted and welded. In this form, methacrylic acid was circulated in the pipe continuously for about 2 years. After the end of circulation of methacrylic acid, the inside of the connection portion of the pipe by butt welding was inspected. As a result, no polymer of methacrylic acid was present and no clogging of the pipe was observed during the circulation.
【００１７】（実施例２）内径８００ｍｍ、高さ１ｍの
竪型円筒形タンク本体において、このタンク底部から２
００ｍｍの位置に、配管内径２５ｍｍの円筒形のノズル
を、溶接用ルート部のルート間隔を０．５ｍｍとし、突
き合せ溶接して接続した。この竪型円筒形タンク本体
に、上記のノズルを介して、重合防止剤が添加されてい
ない純度９９．９９質量％のメタクリル酸メチルを、温
度１５℃、流量１ｍ 3／ｈで受け入れる運転を、約２年
間連続して行なった。運転終了後、突き合せ溶接による
ノズルと竪型円筒形タンク本体の接続部内を検査したと
ころ、メタクリル酸メチルの重合物は存在しておらず、
運転中もノズル内の詰まりは確認されなかった。(Embodiment 2) Inner diameter 800 mm, height 1 m
In the vertical cylindrical tank body, 2 from the bottom of this tank.
A cylindrical nozzle with a pipe inner diameter of 25 mm at a position of 00 mm
And set the root interval of the welding root to 0.5 mm
Welded together and connected. This vertical cylindrical tank body
, The polymerization inhibitor was added through the above nozzle.
Methyl methacrylate with a purity of 99.99% by mass,
15 ℃, flow rate 1m 3/ H for about 2 years
It was carried out continuously. After operation, by butt welding
Inspecting the inside of the connection between the nozzle and the vertical cylindrical tank body
By the way, there is no polymer of methyl methacrylate,
No clogging in the nozzle was confirmed during operation.
【００１８】（比較例１）円筒形配管の突き合せ溶接の
際に、ルート間隔を３ｍｍ取った以外は実施例１と同様
にして、メタクリル酸を流通させた。メタクリル酸の流
通開始６ヶ月経過後、この配管に繋がれたポンプの圧力
が上昇してきたため、工場の仕事量を５０％までに落と
さなければならなかった。工場の運転停止後、突き合せ
溶接による配管の接続部内を検査したところ、この配管
内がメタクリル酸の重合物で、容積の６０％ほど詰まっ
ており、メタクリル酸を所定流量の半分も流通させるこ
とができなかったことが判明した。このため、配管その
ものの交換を行った。(Comparative Example 1) Methacrylic acid was circulated in the same manner as in Example 1 except that the root interval was 3 mm during the butt welding of cylindrical pipes. Six months after the start of distribution of methacrylic acid, the pressure of the pump connected to this pipe increased, so the work load of the factory had to be reduced to 50%. After the operation of the plant was stopped, the inside of the pipe connection by butt welding was inspected, and it was found that this pipe was clogged with methacrylic acid polymer and accounted for about 60% of its volume. It turned out that was not possible. Therefore, the piping itself was replaced.
【００１９】（比較例２）円筒形のノズルと竪型円筒形
タンク本体の突き合せ溶接の際に、ルート間隔を３ｍｍ
取った以外は実施例２と同様にして、メタクリル酸メチ
ルを、ノズルを介して竪型円筒形タンク本体内に受け入
れる運転を行なった。運転開始５ヶ月経過後、タンク本
体内の液面が全く上昇して来ない問題が発生し、工場全
体の運転を停止しなければならなかった。工場の運転停
止後、突き合せ溶接によるノズルとタンク本体の接続部
内を検査したところ、メタクリル酸メチルの重合物が詰
まっていた。このため、ノズルそのものの交換を行っ
た。(Comparative Example 2) In the butt welding of the cylindrical nozzle and the vertical cylindrical tank main body, the root interval is 3 mm.
In the same manner as in Example 2 except that it was taken, an operation of receiving methyl methacrylate into the vertical cylindrical tank body through the nozzle was performed. After the lapse of 5 months from the start of operation, there was a problem that the liquid level in the tank body did not rise at all, and the operation of the entire factory had to be stopped. After the operation of the factory was stopped, the inside of the connection between the nozzle and the tank body by butt welding was inspected, and it was found that the polymer of methyl methacrylate was clogged. Therefore, the nozzle itself was replaced.
【００２０】実施例１、２および比較例１、２の結果か
ら、溶接用ルート部のルート間隔をほとんど設けない
か、または、１．０ｍｍ未満とすれば、突き合せ溶接に
よる配管の接続部において、易重合性物質の重合物によ
る詰まりを効果的に防止することができる。From the results of Examples 1 and 2 and Comparative Examples 1 and 2, if the route interval of the welding route part is hardly provided or is set to less than 1.0 mm, in the connection part of the pipe by butt welding. Further, it is possible to effectively prevent clogging of the easily polymerizable substance due to the polymer.
【００２１】[0021]
【発明の効果】以上説明したように、本発明の突き合せ
溶接方法は、配管を突き合せて溶接する突き合せ溶接方
法において、前記配管の端部に開先加工を施して溶接用
ルート部を形成し、該溶接用ルート部のルート間隔を
１．０ｍｍ未満とするから、溶接後の配管の接続部の内
面に溶接盛りが残留することがなく、結果として、配管
の接続部に、配管内を流通する流体が滞留する部分が存
在しない。本発明の易重合性物質を含む液体の取扱方法
は、突き合せて溶接した配管を用いる易重合性物質を含
む液体の取扱方法において、前記配管の突き合せ溶接が
上記の突き合せ溶接方法で施されたものであるから、易
重合性物質を含む液体を輸送する配管同士の接続部や、
この配管と易重合性物質を含む液体を取り扱う各種機器
との接続部において、易重合性物質を含む液体の滞留部
分が存在しない。したがって、易重合性物質を含む液体
を輸送する配管同士の接続部内や、この配管と易重合性
物質を含む液体を取り扱う各種機器との接続部内を輸送
する易重合性物質の重合物の生成によって、これらの接
続部の内部が詰まり、易重合性物質を含む液体の輸送が
不能となることがない。本発明の突き合せ溶接構造は、
配管を突き合せて溶接によって接続する突き合せ溶接構
造において、前記配管の端部に形成された溶接用ルート
部のルート間隔が１．０ｍｍ未満であるから、配管の接
続部の内面に溶接盛りが残留していない。したがって、
配管の内面に、必ずしもグラインダー仕上げやバフ仕上
げを施す必要がない。さらに、配管の接続部に、配管内
を流通する流体が滞留する部分が存在しない。本発明の
易重合性物質を含む液体の取扱装置は、易重合性物質を
含む液体を輸送する配管が突き合せ溶接構造により接続
されている易重合性物質を含む液体の取扱装置におい
て、前記突き合せ溶接構造が上記の突き合せ溶接構造で
あるから、易重合性物質を含む液体を輸送する配管同士
の接続部の内面や、この配管と易重合性物質を含む液体
を取り扱う各種機器との接続部の内面に、溶接盛りが残
留していない。結果として、易重合性物質を含む液体の
滞留部分が存在しない。したがって、易重合性物質を含
む液体を輸送する配管同士の接続部の内面や、この配管
と易重合性物質を含む液体を取り扱う各種機器との接続
部の内面に、必ずしもグラインダー仕上げやバフ仕上げ
を施す必要がない。さらに、易重合性物質を含む液体を
輸送する配管同士の接続部内や、この配管と易重合性物
質を含む液体を取り扱う各種機器との接続部内を輸送す
る易重合性物質の重合物の生成によって、これらの接続
部の内部が詰まり、易重合性物質を含む液体の輸送が不
能となることがない。そして、易重合性物質を含む液体
の重合を防止するために、重合防止剤を過剰に添加する
必要がなくなる。As described above, the butt welding method of the present invention is a butt welding method in which pipes are butt-welded to each other. Since it is formed and the root interval of the welding root portion is less than 1.0 mm, the weld deposit does not remain on the inner surface of the joint portion of the pipe after welding, and as a result, the joint portion of the pipe is There is no part where the fluid flowing through the stagnation stays. The method for handling a liquid containing an easily polymerizable substance of the present invention is a method for handling a liquid containing an easily polymerizable substance using butt welded pipes, in which the butt welding of the pipe is performed by the above butt welding method. Therefore, the connection between the pipes for transporting the liquid containing the easily polymerizable substance,
At the connecting portion between this pipe and various devices that handle the liquid containing the easily polymerizable substance, there is no retained portion of the liquid containing the easily polymerizable substance. Therefore, by the formation of the polymer of the easily polymerizable substance that is transported in the connection between the pipes that transport the liquid containing the easily polymerizable substance or in the connection between this pipe and various devices that handle the liquid containing the easily polymerizable substance. Therefore, the inside of these connection parts will not be blocked, and the liquid containing the easily polymerizable substance will not be unable to be transported. The butt welding structure of the present invention is
In a butt-welding structure in which pipes are butted and connected by welding, since a root interval of a welding root portion formed at an end portion of the pipe is less than 1.0 mm, a weld deposit is formed on an inner surface of the pipe connecting portion. It does not remain. Therefore,
The inner surface of the pipe does not necessarily have to be grindered or buffed. Further, there is no portion where the fluid flowing in the pipe is retained at the connecting portion of the pipe. The liquid handling device containing an easily polymerizable substance of the present invention is a liquid handling device containing an easily polymerizable substance in which pipes for transporting a liquid containing an easily polymerizable substance are connected by a butt welding structure. Since the butt-welding structure is the butt-welding structure described above, the inner surface of the connecting portion between the pipes that transport the liquid containing the easily polymerizable substance and the connection between this pipe and various devices that handle the liquid containing the easily polymerizable substance. No weld deposit remains on the inner surface of the part. As a result, there is no stagnant portion of the liquid containing the easily polymerizable substance. Therefore, the inner surface of the connection between the pipes that transport the liquid containing the easily polymerizable substance, and the inner surface of the connection between this pipe and various devices that handle the liquid containing the easily polymerizable substance do not necessarily have a grinder finish or a buff finish. No need to give. Furthermore, by the formation of a polymer of the easily polymerizable substance that is transported in the connection between the pipes that transport the liquid containing the easily polymerizable substance or in the connection between this pipe and various devices that handle the liquid containing the easily polymerizable substance. Therefore, the inside of these connection parts will not be blocked, and the liquid containing the easily polymerizable substance will not be unable to be transported. Then, it is not necessary to add an excessive amount of the polymerization inhibitor in order to prevent the polymerization of the liquid containing the easily polymerizable substance.
【図１】 本発明の突き合せ溶接構造の一例を示す概略
断面図である。FIG. 1 is a schematic sectional view showing an example of a butt welding structure of the present invention.
【図２】 従来の突き合せ溶接による配管の接続部の構
造を示す概略断面図である。FIG. 2 is a schematic cross-sectional view showing a structure of a connecting portion of a pipe by conventional butt welding.
１１・・・配管、１１ａ・・・端部、１２・・・溝、１３・・・ルー
ト部、１４・・・溶接材11 ... Piping, 11a ... End, 12 ... Groove, 13 ... Root, 14 ... Welding material
───────────────────────────────────────────────────── フロントページの続き (72)発明者 藤本 仁史 広島県大竹市御幸町20番１号 三菱レイヨ ン・エンジニアリング株式会社内 Ｆターム(参考） 4E081 BA27 YX07 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Hitoshi Fujimoto 20-1 Miyuki-cho, Otake-shi, Hiroshima Mitsubishi Rayo Inside Engineering Co., Ltd. F-term (reference) 4E081 BA27 YX07
Claims (7)
方法において、 前記配管の端部に開先加工を施して溶接用ルート部を形
成し、該溶接用ルート部のルート間隔を１．０ｍｍ未満
とすることを特徴とする突き合せ溶接方法。1. A butt welding method for butt-welding pipes, wherein an end portion of the pipe is groove-processed to form a welding root portion, and a root interval of the welding root portion is 1.0 mm. Butt welding method characterized in that
性物質を含む液体の取扱方法において、 前記配管の突き合せ溶接が請求項１記載の突き合せ溶接
方法で施されたものであることを特徴とする易重合性物
質を含む液体の取扱方法。2. A method for handling a liquid containing an easily polymerizable substance using butt-welded pipes, wherein the butt-welding of the pipes is performed by the butt-welding method according to claim 1. A method for handling a liquid containing a characteristic easily polymerizable substance.
の取扱方法において、 前記突き合せ溶接が前記配管と易重合性物質を含む液体
を取り扱う機器とを接続したものであることを特徴とす
る易重合性物質を含む液体の取扱方法。3. The method for handling a liquid containing an easily polymerizable substance according to claim 2, wherein the butt welding connects the pipe and a device for handling a liquid containing an easily polymerizable substance. Handling method of liquid containing easily polymerizable substance.
酸、（メタ）アクリル酸エステル、（メタ）アクロレイ
ンから選ばれる少なくとも１種類以上であることを特徴
とする請求項２または３記載の易重合性物質を含む液体
の取扱方法。4. The easily polymerizing substance is at least one selected from (meth) acrylic acid, (meth) acrylic acid ester, and (meth) acrolein. A method of handling a liquid containing an easily polymerizable substance.
突き合せ溶接構造において、 前記配管の端部に形成された溶接用ルート部のルート間
隔が１．０ｍｍ未満であることを特徴とする突き合せ溶
接構造。5. A butt-welding structure in which pipes are butted and connected by welding, wherein the root intervals of welding root portions formed at the ends of the pipes are less than 1.0 mm. Welded structure.
が突き合せ溶接構造により接続されている易重合性物質
を含む液体の取扱装置において、 前記突き合せ溶接構造が請求項５記載の突き合せ溶接構
造であることを特徴とする易重合性物質を含む液体の取
扱装置。6. A handling device for a liquid containing an easily polymerizable substance, wherein pipes for transporting a liquid containing an easily polymerizable substance are connected by a butt welding structure, wherein the butt welding structure is the butt welding structure. An apparatus for handling a liquid containing an easily polymerizable substance, which has a welded structure.
の取扱装置において、 前記突き合せ溶接構造が、前記易重合性物質を含む液体
を輸送する配管と易重合性物質を含む液体を取り扱う機
器とを接続していることを特徴とする易重合性物質を含
む液体の取扱装置。7. The apparatus for handling a liquid containing an easily polymerizable substance according to claim 6, wherein the butt welding structure includes a pipe for transporting the liquid containing the easily polymerizable substance and a liquid containing the easily polymerizable substance. An apparatus for handling a liquid containing an easily polymerizable substance, characterized in that it is connected to the equipment to be handled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002088202A JP2003285194A (en) | 2002-03-27 | 2002-03-27 | Butt welding method and structure of butt welding, handling method for liquid containing easily polymerizable substance and handling apparatus used for the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002088202A JP2003285194A (en) | 2002-03-27 | 2002-03-27 | Butt welding method and structure of butt welding, handling method for liquid containing easily polymerizable substance and handling apparatus used for the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003285194A true JP2003285194A (en) | 2003-10-07 |
| JP2003285194A5 JP2003285194A5 (en) | 2005-09-08 |
Family
ID=29234136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002088202A Pending JP2003285194A (en) | 2002-03-27 | 2002-03-27 | Butt welding method and structure of butt welding, handling method for liquid containing easily polymerizable substance and handling apparatus used for the same |
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| Country | Link |
|---|---|
| JP (1) | JP2003285194A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104339070A (en) * | 2013-07-26 | 2015-02-11 | 中冶天工上海十三冶建设有限公司 | Method for welding V-shaped groove pipeline by all-position automatic argon arc welder |
-
2002
- 2002-03-27 JP JP2002088202A patent/JP2003285194A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104339070A (en) * | 2013-07-26 | 2015-02-11 | 中冶天工上海十三冶建设有限公司 | Method for welding V-shaped groove pipeline by all-position automatic argon arc welder |
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