JPS6219635B2 - - Google Patents
Info
- Publication number
- JPS6219635B2 JPS6219635B2 JP54149144A JP14914479A JPS6219635B2 JP S6219635 B2 JPS6219635 B2 JP S6219635B2 JP 54149144 A JP54149144 A JP 54149144A JP 14914479 A JP14914479 A JP 14914479A JP S6219635 B2 JPS6219635 B2 JP S6219635B2
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- temperature
- ice plug
- transition temperature
- coolant
- 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.)
- Expired
Links
- 230000007704 transition Effects 0.000 claims description 25
- 239000002826 coolant Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 12
- 238000007710 freezing Methods 0.000 claims description 7
- 230000008014 freezing Effects 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 34
- 239000007788 liquid Substances 0.000 description 20
- 229910052757 nitrogen Inorganic materials 0.000 description 16
- 238000012360 testing method Methods 0.000 description 13
- 229910000975 Carbon steel Inorganic materials 0.000 description 6
- 239000010962 carbon steel Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- QJGQUHMNIGDVPM-BJUDXGSMSA-N Nitrogen-13 Chemical compound [13N] QJGQUHMNIGDVPM-BJUDXGSMSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
Landscapes
- Pipe Accessories (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、配管のアイスプラグ工法に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ice plug method for piping.
アイスプラグ工法は、配管内に水などの冷却材
を充填しアイスプラグ形成部分の配管外周にジヤ
ケツトを装着し、このジヤケツト内に液体窒素ま
たはドライアイスを供給しジヤケツト装着部分の
配管内の冷却材を凍結しアイスプラグを形成し、
配管の上流側と下流側とを氷によつて遮断し止め
弁の代用をさせる工法である。そして、配管内の
耐圧試験や配管の切断の際に利用されており、ま
た、この工法の実施位置は、アイスプラグの健全
性の維持の点から、レジユーサ、エルボ等の曲管
部が望ましい。
The ice plug method involves filling a pipe with a coolant such as water, attaching a jacket to the outer periphery of the pipe where the ice plug is formed, and supplying liquid nitrogen or dry ice into the jacket to remove the coolant inside the pipe where the jacket is attached. freeze to form an ice plug,
This is a construction method that uses ice to block the upstream and downstream sides of piping and use it as a stop valve. It is used for pressure testing inside pipes and for cutting pipes, and from the viewpoint of maintaining the integrity of the ice plug, it is preferable to implement this method in curved pipe sections such as resistors and elbows.
第１図は従来のアイスプラグ工法の実施装置を
示し、４はアイスプラグ工法が実施される配管
で、内部には冷却材の水５が充填されており、配
管４にはジヤケツト２が取り付けられている。ジ
ヤケツト２内には、弁８を備えた液体窒素配管７
を介して液体窒素ボンベ１から液体窒素１３が満
たされ、水５を凍結してアイスプラグ６を形成す
るようになつている。ジヤケツト２からオーバフ
ローした液体窒素１３は蒸発器３において蒸発し
排気管９を経て外気に放出される。尚、第１図は
アイスプラグ６を健全性維持の容易なエルボ部分
に形成している。そして、ジヤケツト２部分の配
管４は冷却されて液体窒素の沸点である−195.8
℃付近まで冷却されていると考えられる。矢印は
耐圧試験時の圧力印加方向であり、このようなア
イスプラグ工法は、冷却対象配管が極低温度にお
いて遷移温度を持たないステンレス鋼管の場合に
は、この状態で脆性破壊を生じることなく耐圧試
験を行うことができる。しかし、炭素鋼管の如く
０〜−10数℃の高い遷移温度を有する材料におい
てはアイスプラグ６を止め弁の代用として使用す
ることは危険である。即ち、配管４にはアイスプ
ラグ形成によつて生じる応力の他にその他の応力
も加わつており、これに耐圧試験用の圧力を加え
ることは脆性破壊を生じるおそれがある。
Fig. 1 shows a conventional ice plug method implementation device, and 4 is a pipe on which the ice plug method is performed, the inside of which is filled with water 5 as a coolant, and a jacket 2 is attached to the pipe 4. ing. Inside the jacket 2 is a liquid nitrogen pipe 7 equipped with a valve 8.
Liquid nitrogen 13 is filled from a liquid nitrogen cylinder 1 via the liquid nitrogen cylinder 1, and water 5 is frozen to form an ice plug 6. The liquid nitrogen 13 overflowing from the jacket 2 is evaporated in the evaporator 3 and discharged to the outside air through the exhaust pipe 9. In addition, in FIG. 1, the ice plug 6 is formed at the elbow part where the integrity can be easily maintained. Then, the pipe 4 in the jacket 2 section is cooled down to the boiling point of liquid nitrogen -195.8
It is thought that it has been cooled to around ℃. The arrow indicates the direction of pressure application during the pressure test. This ice plug method can withstand pressure without causing brittle fracture in this state if the piping to be cooled is a stainless steel pipe that does not have a transition temperature at an extremely low temperature. Tests can be conducted. However, it is dangerous to use the ice plug 6 as a substitute for a stop valve in materials such as carbon steel pipes, which have a high transition temperature of 0 to -10 degrees Celsius. That is, in addition to the stress caused by the formation of the ice plug, other stresses are also applied to the pipe 4, and applying pressure for a pressure test to this may cause brittle fracture.
本発明は、このような欠点をを解消し、炭素鋼
の如き遷移温度を有する材料の配管に耐圧試験が
実施できる配管のアイスプラグ工法を提供するこ
とを目的とするものである。 SUMMARY OF THE INVENTION An object of the present invention is to eliminate such drawbacks and provide an ice plug method for piping, which allows pressure tests to be carried out on piping made of a material having a transition temperature such as carbon steel.
前述の問題点を解決するためになされた本発明
の構成は、配管内に冷却材を充填し凍結させるア
イスプラグ工法において、遷移温度を有する材料
からなる配管内に充填された冷却材を遷移温度以
下に冷却し冷却材が凍結されアイスプラグを形成
後、このアイスプラグ部分を、遷移温度以上で冷
却材の凝固点以下に暖めて所定温度に保持するこ
とを特徴とするものである。
The configuration of the present invention, which was made to solve the above-mentioned problems, is that in the ice plug method in which a coolant is filled in a pipe and frozen, the coolant filled in a pipe made of a material having a transition temperature is heated to a transition temperature. After the coolant is cooled to form an ice plug, the ice plug portion is heated to a temperature above the transition temperature and below the freezing point of the coolant and maintained at a predetermined temperature.
本発明は炭素鋼の如き遷移温度を有する材料の
配管では、遷移温度以上の温度で耐圧試験用の圧
力を加えることが必要なことと、アイスプラグ形
成温度及び耐圧試験用の圧力を加える温度は必ず
しも一致している必要はなく、二段操作にした方
が簡単、容易になる点に着目してなされたもので
ある。以下にその作用について述べる。
The present invention requires that in piping made of a material with a transition temperature such as carbon steel, it is necessary to apply pressure for a pressure test at a temperature above the transition temperature, and that the ice plug forming temperature and the temperature at which pressure is applied for a pressure test are They do not necessarily have to match, and this was done with the focus on the fact that a two-stage operation would be simpler and easier. The effect will be described below.
本発明では、まず、遷移温度を有する材料から
なる配管内に充填された冷却材をこの遷移温度以
下に冷却し冷却材が凍結されアイスプラグを形成
する。この操作によつて、配管の所定の部分にア
イスプラグを短時間かつ確実に形成することがで
きる。そしてこの操作は例えば液体窒素の使用に
より簡単、容易に実施することができる。この状
態では耐圧試験用の圧力は加えない。次にこのよ
うにして形成されたアイスプラグ部分を遷移温度
以上でかつ冷却材の凝固点以下に暖めて所定温度
に保持される。この操作により配管の所定部分は
アイスプラグが形成された状態のまま、配管の温
度を遷移温度以上とすることができる。従つて、
耐圧試験用の圧力を加えても配管は遷移温度以上
になつているので脆性破壊が生じるのを避けるこ
とができる。なお、この操作も、例えばヒータに
よる例えば液体窒素の加熱により行なうことがで
きるので、この操作も簡単、容易に実施すること
ができる。 In the present invention, first, a coolant filled in a pipe made of a material having a transition temperature is cooled to below this transition temperature, and the coolant is frozen to form an ice plug. By this operation, an ice plug can be reliably formed in a predetermined portion of the pipe in a short time. This operation can be simply and easily carried out by using liquid nitrogen, for example. In this state, no pressure is applied for the pressure test. The ice plug section thus formed is then heated above the transition temperature and below the freezing point of the coolant and maintained at a predetermined temperature. This operation allows the temperature of the pipe to rise above the transition temperature while the ice plug remains formed in a predetermined portion of the pipe. Therefore,
Even if the pressure for the pressure test is applied, the temperature of the piping is above the transition temperature, so brittle fracture can be avoided. Note that this operation can also be performed by heating liquid nitrogen, for example, with a heater, so that this operation can also be performed simply and easily.
このようにして、炭素鋼の如き遷移温度を有す
る材料からなる配管の耐圧試験を簡単、容易に実
施可能とすることができる。 In this way, it is possible to simply and easily perform a pressure test on piping made of a material having a transition temperature such as carbon steel.
以下本発明の配管のアイスプラグ工法の一実施
例を従来の方法実施の装置と同部品は同符号で示
し同部分の説明は省略し第２図により説明する。
１１は蒸発器、１２は加温器、１５は流量調整弁
であり、蒸発器１１は弁１０を介し、弁８の上流
側の液体窒素供給配管７に連通されており、ま
た、流量調整弁１５は液体窒素供給配管７の弁８
の下流側に連通され、流量調整弁１５の上流側は
加温器１２を経て蒸発器１１に連通されている。
１６は温度指示制御装置で、環状ジヤケツト２の
内周と遷移温度を有する材料からなる配管４の外
周との間の温度をサーモカツプル１７を介し測定
し流量調整弁１５に信号を送りその開度を制御す
るようになつている。
Hereinafter, an embodiment of the piping ice plug method of the present invention will be described with reference to FIG. 2, where the same parts as the equipment used in the conventional method are designated by the same reference numerals, and explanations of the same parts will be omitted.
11 is an evaporator, 12 is a warmer, and 15 is a flow rate adjustment valve, and the evaporator 11 is connected to the liquid nitrogen supply pipe 7 on the upstream side of the valve 8 via the valve 10. 15 is a valve 8 of the liquid nitrogen supply pipe 7
The upstream side of the flow rate adjustment valve 15 is connected to the evaporator 11 via the heater 12.
16 is a temperature indication control device which measures the temperature between the inner periphery of the annular jacket 2 and the outer periphery of the pipe 4 made of a material having a transition temperature via a thermocouple 17, and sends a signal to the flow rate regulating valve 15 to determine its opening degree. control.
そして、アイスプラグ工法を実施する場合は、
弁１０を閉とし、第１図の場合と同様に弁８を開
とし液体窒素ポンベ１の液体窒素を液体窒素供給
配管７を経てジヤケツト２内に送り配管４を外周
側より冷却する。そして、ジヤケツト２からオー
バフローした液体窒素１３は蒸発器３において蒸
発し排気管９から大気へ放出される。このように
して、ジヤケツト２取付部の配管４内にアイスプ
ラグ６が形成された後、弁８を閉とし弁１０を開
とし、液体窒素ボンベ１からの液体窒素を蒸発器
１１、加温器１２によつて、配管４の材料の遷移
温度以上である30〜40℃の窒素ガス１４となしジ
ヤケツト２内に送り込む。このため、ジヤケツト
２内の液体窒素１３は蒸発器３を通り気化し排気
管９を通つて外気に放出される。ジヤケツト２内
が空になり、かつ配管４の表面温度が上昇し配管
４の遷移温度に達した後、加温器１２の窒素ガス
１４の出口温度を遷移温度よりやや高く水の凝固
点より低い温度に下げて保持する。そして、アイ
スプラグ６を形成している配管４の表面温度を、
温度指示制御装置１６により測定し、これにもと
づき流量調整弁１５に信号を送り開度を制御し遷
移温度以上で水の凝固点以下の所定の温度範囲に
保持する。耐圧試験等のため配管４に外力を加え
る時期は、上記の温度範囲に配管温度が安定した
ことを確認した後とすることにより、炭素鋼管等
の遷移温度を有する材料の場合にもアイスプラグ
工法により耐圧試験を、配管破壊等を招くことな
く行うことができる。 When implementing the ice plug method,
The valve 10 is closed, and the valve 8 is opened as in the case of FIG. 1 to send liquid nitrogen from the liquid nitrogen pump 1 into the jacket 2 through the liquid nitrogen supply pipe 7 and cool the pipe 4 from the outer circumferential side. The liquid nitrogen 13 overflowing from the jacket 2 is then evaporated in the evaporator 3 and discharged into the atmosphere from the exhaust pipe 9. After the ice plug 6 is formed in the pipe 4 of the jacket 2 attachment part in this way, the valve 8 is closed and the valve 10 is opened to supply liquid nitrogen from the liquid nitrogen cylinder 1 to the evaporator 11 and the heater. 12, nitrogen gas 14 at a temperature of 30 DEG to 40 DEG C., which is above the transition temperature of the material of the pipe 4, is fed into the solid jacket 2. Therefore, the liquid nitrogen 13 in the jacket 2 is vaporized through the evaporator 3 and discharged to the outside air through the exhaust pipe 9. After the inside of the jacket 2 is emptied and the surface temperature of the pipe 4 rises and reaches the transition temperature of the pipe 4, the outlet temperature of the nitrogen gas 14 of the heater 12 is set to a temperature slightly higher than the transition temperature and lower than the freezing point of water. Lower and hold. Then, the surface temperature of the pipe 4 forming the ice plug 6 is
The temperature is measured by the temperature indication control device 16, and based on this, a signal is sent to the flow rate regulating valve 15 to control the opening degree and maintain the temperature within a predetermined temperature range above the transition temperature and below the freezing point of water. By applying external force to the piping 4 for pressure resistance tests, etc., after confirming that the piping temperature has stabilized within the above temperature range, the ice plug method can also be applied to materials with transition temperatures such as carbon steel pipes. This allows pressure tests to be carried out without causing damage to the pipes.
以上記述した如く本発明のアイスプラグ工法に
よれば、配管内に充填された冷却材を配管材料の
遷移温度以下に冷却して冷却材が凍結されアイス
プラグが生成後、このアイスプラグ部分を遷移温
度以上でかつ冷却材の凝固点以下に暖めて所定温
度に保持した状態で加圧することにより、炭素鋼
の如き遷移温度を有する材料の配管の耐圧試験を
行うことができる効果を有するものである。
As described above, according to the ice plug construction method of the present invention, the coolant filled in the pipe is cooled to below the transition temperature of the pipe material, the coolant is frozen, and an ice plug is generated. By heating the coolant above the temperature and below the freezing point of the coolant and pressurizing it while maintaining the temperature at a predetermined temperature, it is possible to perform a pressure resistance test on piping made of a material having a transition temperature such as carbon steel.
第１図は従来の配管のアイスプラグ工法実施装
置の概略図、第２図は本発明の配管のアイスプラ
グ工法実施装置の概略図である。
１……液体窒素ボンベ、２……ジヤケツト、
３，１１……蒸発器、４……配管、５……水、６
……アイスプラグ、７……液体窒素供給管、１２
……加温器、１５……流量調整弁、１６……温度
指示制御装置。
FIG. 1 is a schematic diagram of a conventional apparatus for implementing the ice plug method for piping, and FIG. 2 is a schematic diagram for an apparatus for implementing the ice plug method for piping according to the present invention. 1... Liquid nitrogen cylinder, 2... Jacket,
3,11...Evaporator, 4...Piping, 5...Water, 6
...Ice plug, 7...Liquid nitrogen supply pipe, 12
... Warmer, 15 ... Flow rate adjustment valve, 16 ... Temperature instruction control device.
Claims (1)
ラグ工法において、遷移温度を有する材料からな
る上記配管内に充填された冷却材を遷移温度以下
に冷却し冷却材が凍結されアイスプラグを形成
後、該アイスプラグ部分を、遷移温度以上でかつ
冷却材の凝固点以下に暖めて所定温度に保持する
ことを特徴とする配管のアイスプラグ工法。1. In the ice plug method of filling and freezing a coolant in a pipe, the coolant filled in the pipe made of a material having a transition temperature is cooled to below the transition temperature, and after the coolant is frozen and an ice plug is formed, An ice plug method for piping, characterized in that the ice plug portion is heated to a temperature above the transition temperature and below the freezing point of the coolant and maintained at a predetermined temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14914479A JPS5673293A (en) | 1979-11-16 | 1979-11-16 | Ice plug construction of pipings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14914479A JPS5673293A (en) | 1979-11-16 | 1979-11-16 | Ice plug construction of pipings |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5673293A JPS5673293A (en) | 1981-06-17 |
| JPS6219635B2 true JPS6219635B2 (en) | 1987-04-30 |
Family
ID=15468720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14914479A Granted JPS5673293A (en) | 1979-11-16 | 1979-11-16 | Ice plug construction of pipings |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5673293A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007327662A (en) * | 2006-06-06 | 2007-12-20 | Hitachi Building Systems Co Ltd | Absorption refrigerator maintenance method and cooling freezer |
| JP4972595B2 (en) * | 2008-03-31 | 2012-07-11 | 日立Ｇｅニュークリア・エナジー株式会社 | Method for inhibiting crack growth in piping |
| JP7327081B2 (en) * | 2019-10-28 | 2023-08-16 | 東京電力ホールディングス株式会社 | Freezing judgment method in freezing method |
-
1979
- 1979-11-16 JP JP14914479A patent/JPS5673293A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5673293A (en) | 1981-06-17 |
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