JP3855199B2 - High temperature internal pressure bending creep test method and test apparatus - Google Patents

Description

【００３１】
ブロワ１１の主要仕様
形式 ：ボルテックスブロワ ＶＢ−００３Ｅ
メーカ ：日立製作所
定挌風量 ：０．８ｍ３／ｍｉｎ
吐出し静圧：８．５ｋＰａ
出力 ：０．２６ｋＷ
【００３２】
試験要領
（１）試験体１を６３０℃まで加熱し、保持する。
（２）試験体１内部を６．３７ＭＰａに加圧し、保持する。
（３）試験体１に５００ｋＮの初期荷重を掛け、曲げを付加する。
（４）荷重は１週間毎に掛け替えを行い、繰り返し荷重を掛ける。
（５）試験体１が破壊に到るまで（予定１０，０００時間）の間で、適宜（３〜５回）試験装置の中途止めを行い、以下の項目について試験体１の検査を実施する。
ａ．表面非破壊検査（染色浸透探傷試験、磁粉探傷試験）
ｂ．断面非破壊検査（超音波探傷試験）
ｃ．表面金属組織観察（表面レプリカ採取）
【００３３】
以上の試験体、機器および試験要領により試験した場合の試験開始から５０００秒経過までの結果を、図９の変形量制御がなされない場合の荷重装置による荷重および変位の計時変化を示すグラフ、および図１０の変形量制御がなされた場合の荷重装置による荷重および変位の計時変化を示すグラフに示す。
【００３４】
【発明の効果】
本発明による高温内圧曲げクリープ試験方法および試験装置は以上のように構成されていることにより、以下のような効果を得ることができる。
（１）円筒状圧力容器である試験体の円筒軸を水平に配置した状態でその両端部を支持し、試験体を外周から加熱して所定温度に保持し、試験体の内部に水を注入して蒸気を発生させ所定圧力に保持し、試験体の円筒軸方向中央部に上方から下方へ荷重を掛けて保持した状態を長時間継続することにより、曲げ応力の条件を付加できる高温内圧曲げクリープ試験を行うことが可能になった。
【００３５】
（２）試験体に掛けられた荷重による曲げ変位量を一定に保持することにより、正常なクリープ試験が可能になった。
（３）試験装置架台に固定支持して変位計が設けられ、変位計が試験体の円筒軸直角断面における頂部外周の変位を計測可能に配置され、変位計が制御装置に連結されていることにより、曲げ変位量を一定に保持する試験が容易に実現可能になった。
【００３６】
（４）試験装置架台の支持台が、支持台に載置された試験体を保持し、かつ、試験体の円筒軸直角断面における外周真横の位置に設けられたストッパが当接可能な円筒軸方向に、サポートに支持されたＵボルトを設け、２箇の支持台に設けられたサポート間のＵボルトの円筒軸方向内側距離が試験体の円筒軸方向両端付近に設けられたストッパの円筒軸方向外側距離よりも大きく、かつ、両距離の差が加熱状態における前記ストッパの移動距離に許容値を加えて決定されて構成されていることにより、外乱の無い試験結果を得ることが可能になった。
【００３７】
（５）荷重装置に冷却装置が連結されていることにより、荷重装置が試験体の高温の影響を受けることなく、正確な試験を実施することが可能になった。
（６）本発明による試験方法および試験装置により、図１０に示すように、変位量を一定にした場合の荷重の変化を計測することが可能になった。
【図面の簡単な説明】
【図１】本発明による高温内圧曲げクリープ試験装置本体および試験装置に設置された試験体を示す部分断面正面図である。
【図２】図１における矢視II側面図である。
【図３】試験体を示す部分断面正面図である。
【図４】試験体の端部の設置状態を示す部分正面図である。
【図５】図４の矢視Ｖ側面図である。
【図６】荷重装置の先端部の設置状態を示す側面図である。
【図７】高温内圧曲げクリープ試験装置を示す系統図である。
【図８】高温内圧曲げクリープ試験装置の荷重付加制御方法を示すフロー図である。
【図９】変形量制御がなされない場合の荷重装置による荷重および変位の計時変化を示すグラフである。
【図１０】変形量制御がなされた場合の荷重装置による荷重および変位の計時変化を示すグラフである。
【符号の説明】
１ 試験体
１ａ 鋼管
１ｂ 鏡板
１ｃ 砂利
２ 加熱装置
３ 荷重装置
３ａ スクリュージャッキ
３ｂ ロードセル
３ｃ 演算器
４ 給水装置
４ａ 給水ポンプ
４ｂ 給水タンク
４ｃ 給水配管
４ｄ 給水ポンプ出口弁
５ 冷却装置
５ａ 冷却装置本体
５ｂ 耐荷重断熱材
５ｃ 取付金具
５ｄ スペーサ
５ｅ 空気供給口
５ｆ 空気排出口
５ｇ 排気配管
６ ストッパー装置
６ａ ストッパー
６ｂ サポート
７ 制御装置
７ａ 変位計
７ｂ 変位検出回路
７ｃ ローパスフィルタ
７ｄ ＡＤ変換器
７ｅ 演算装置
７ｆ 荷重制御回路
７ｇ 変位計取付架台
８ 試験装置架台
８ａ ベッド
８ｂ 装置固定梁
８ｃ 支持台
８ｄ 支柱
８ｅ Ｕボルト・ナット
９ 圧力検出装置
９ａ 圧力検出器
９ｂ 圧力検出配管
９ｃ 圧力検出装置ブロー弁
１０ ドレン装置
１０ａ ドレン配管
１０ｂ ドレン止弁
１１ ブロワ
１１ａ 給気配管[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a high-temperature internal pressure bending creep test method and test apparatus using a test piece of actual machine size for evaluating the reliability of a pressure vessel used in a high-temperature and high-pressure state.
[0002]
[Prior art]
Regarding a pressure vessel used in a high temperature and high pressure state, for example, a pressure vessel constituting a boiler, there is a high temperature creep internal pressure burst test as a reliability evaluation test of creep rupture strength that has been conventionally performed (see, for example, Patent Document 1). ). In this test, a creep test is performed in a high temperature state in which an internal pressure is applied, using a pressure vessel of an almost actual size as a test body. That is, it is carried out by applying an internal pressure to a test body of a cylindrical pressure vessel of almost actual size, providing a heating device on the outer periphery and heating it, and holding it for a long time in a test condition state of a predetermined temperature and pressure. During the test period, non-destructive tests such as a dye penetration test, a magnetic particle test, an ultrasonic test, and a surface replica collection are periodically performed.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-108589
[Problems to be solved by the invention]
Conventional tests for evaluating the reliability of pressure vessels used at high temperatures and high pressures have been configured as described above, and thus have the following problems. That is, various external forces are applied to various pressure vessels constituting a large boiler during actual operation at high temperature and high pressure, and stress due to the external force is generated. The actual machine has a welded joint in production, and the mechanism of creep fracture when an external force is applied to this weld has not been clarified yet. Therefore, in order to evaluate the reliability of such a pressure vessel, the two conditions of temperature and pressure are insufficient, and it is necessary to perform the reliability evaluation with the stress condition due to external force added.
[0005]
The present invention has been made to solve the above-described problems, and in a test for evaluating the reliability of a pressure vessel, a high-temperature internal pressure bending creep test that can add a bending stress condition in addition to the conventional temperature and pressure. An object is to provide a method and a test apparatus.
[0006]
[Means for Solving the Problems]
The high-temperature internal pressure bending creep test method according to the present invention supports both ends of the test piece, which is a cylindrical pressure vessel, in a state where the cylindrical shaft is horizontally arranged, and heats the test piece from the outer periphery to maintain a predetermined temperature. Water is injected into the test body to generate steam, maintained at a predetermined pressure, and the state in which a load is applied from the upper side to the lower side of the central part in the cylindrical axis direction of the test body is maintained for a long time. This is a test method.
[0007]
Specifically, the test method is characterized in that the amount of bending displacement due to the load applied to the specimen is kept constant.
[0008]
A high-temperature internal pressure bending creep test apparatus according to the present invention has two support bases that support both ends in the cylindrical axis direction of a test body that is a cylindrical pressure vessel, and a device fixing beam above the center part of the cylindrical axis of the test body. It is composed of a gantry, a heating device provided over the outer periphery of the test body, a water supply device connected to the test body, a drain device and a pressure detection device, and a load device fixed to the device fixing beam and acting downward. This is a characteristic test apparatus.
[0009]
Specifically, a displacement gauge is provided by being fixedly supported on a separate displacement gauge mounting stand, and the displacement gauge is arranged so as to be able to measure the displacement of the outer periphery of the top in the cross section perpendicular to the cylindrical axis of the test specimen, A test device characterized in that a displacement meter is connected to a control device.
[0010]
In detail, the support base of the test apparatus base holds the test body mounted on the support base, and the cylindrical axis direction in which the stopper provided at the position directly beside the outer periphery in the cross section perpendicular to the cylindrical axis of the test body can contact The U-bolt supported by the support is provided, and the inner distance in the cylindrical axis direction between the U bolts provided on the two support bases is the outer distance in the cylindrical axis direction of the stopper provided near both ends in the cylindrical axis direction of the specimen. And a difference between the two distances is determined by adding an allowable value to the moving distance of the stopper in the heated state.
[0011]
Specifically, the test device is characterized in that a cooling device is connected to the load device.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of a high-temperature internal pressure bending creep test method and a test apparatus according to the present invention will be described in detail with reference to the drawings. 1 is a partial cross-sectional front view showing a high-temperature internal pressure bending creep test apparatus main body and a test body installed in the test apparatus according to the present invention, FIG. 2 is a side view taken along the line II in FIG. 1, and FIG. FIG. 4 is a partial front view showing an installation state of the end portion of the test body, FIG. 5 is a side view taken along the arrow V in FIG. 4, and FIG. 6 is a side view showing the installation state of the distal end portion of the load device. Is a system diagram showing a high-temperature internal pressure bending creep test apparatus, FIG. 8 is a flow chart showing a load addition control method of the high-temperature internal pressure bending creep test apparatus, and FIG. 9 is a time measurement of load and displacement by the load apparatus when displacement amount control is not performed. FIG. 10 is a graph showing changes in load and displacement measured by the load device when the displacement amount is controlled.
[0013]
1 and 2, what is indicated by reference numeral 8 is a test apparatus gantry, and the test apparatus gantry 8 has a substantially rectangular flat bed 8a, and an intermediate portion of the bed 8a is spaced from the front side and the rear side, respectively. A steel structure composed of four columns 8d that stand up with a gap, an apparatus fixing beam 8b supported and fixed to the upper end of the column 8d, and support bases 8c installed on both sides of the bed 8a. is there.
[0014]
On the test apparatus base 8, the test body 1 is arranged with the end portions placed on the upper flat plates of the two support bases 8c on the left and right center lines of the bed 8a. As shown in FIG. 5, the upper flat plate is bent in an arc shape so as to follow the outer peripheral direction of the cylindrical shape of the test body 1. In each of the support bases 8c, the test body 1 is held on the support base 8c with a slight gap by a U-bolt / nut 8e slightly larger than the outer peripheral diameter of the test body 1. The U-bolt / nut 8e is supported by a support 6b at a position corresponding to the right side of both sides of the cross section perpendicular to the cylindrical axis of the test body 1 from the outside in the cylindrical axis XX direction of the test body 1. The test body 1 is provided with a stopper 6a on the inner side of the U-bolt / nut 8e in the cylindrical axis XX direction, at a position a distance α between the U-bolt / nut 8e and right side of both sides of the cross section perpendicular to the cylindrical axis. A stopper device 6 is configured together with the support 6b. That is, the support portion of the U bolt / nut 8e by the support 6b and the stopper 6a are opposed to each other with a clearance α. The gap α is set to a value obtained by adding a predetermined allowable value to the value of elongation due to thermal expansion at the temperature of the test body 1 when the gap α + β is added to the other similar gap β. The test body 1 is placed on the support base 8c while adjusting the position in the cylindrical axis XX direction so that the gaps α and β on both sides are as equal as possible.
[0015]
As shown in FIG. 3, the test body 1 is a cylindrical pressure vessel in which end plates 1b are welded to both ends of a steel pipe 1a and gravel 1c is filled inside, and an appropriate welded joint is provided for testing. Is formed. A water supply pipe 4 c of a water supply device 4 to be described later is connected to one end face of the test body 1. The other end face is connected to a pressure detection pipe 9b of the pressure detection apparatus 9 and a drain pipe 10a of the drain apparatus 10 to be described later. Further, the outer periphery of the test body 1 is covered with the heating device 2 while being placed on the support base 8c.
[0016]
A load device 3 is assembled to the lower surface of the device fixing beam 8b located above the test body 1. The load device 3 includes a screw jack 3a, a load cell 3b, and a calculator 3c, and is assembled to the device fixing beam 8b via the load cell 3b so that the screw jack 3a applies a load downward. As shown in FIG. 6, a cooling device 5 is connected to the lower end of the screw jack 3a. The cooling device 5 includes a cooling device body 5a, a load-bearing heat insulating material 5b, a mounting bracket 5c, and a spacer 5d. That is, the cooling device main body 5a is disposed so as to surround the periphery of the tip portion of the screw jack 3a, and is assembled and fixed to the screw jack 3a by the mounting bracket 5c, and the load-resistant heat insulating material 5b is attached to the tip of the screw jack 3a. The spacers 5d are sequentially assembled. The leading end surface of the most advanced spacer 5d is formed into an arcuate surface along the outer peripheral surface of the test body 1. The cooling device main body 5a is provided with an air supply port 5e and an air discharge port 5f. A blower 11 to be described later is connected to the air supply port 5e via an air supply pipe 11a, and the air discharge port 5f is exhausted. Connected to the pipe 5g, the other end of the exhaust pipe 5g is open to the atmosphere.
[0017]
Further, a displacement meter 7a constituting the control device 7 is assembled and fixedly supported on the displacement meter mounting base 7g, and the tip of the detection rod is close to the spacer 5d of the cooling device 5, that is, the load is applied by the load device 3. It arrange | positions so that it may contact the outer peripheral upper part of the said test body 1 of the vicinity which can be applied.
[0018]
In FIG. 7, a water supply pump 4a and a water supply tank 4b of the water supply device 4 are connected to one end face (left side in FIG. 7) of the test body 1 via the water supply pipe 4c, and the other (right side in FIG. 7). The pressure detector 9a and the pressure detection device blow valve 9c of the pressure detection device 9 are provided via the pressure detection piping 9b, and the drain stop valve 10b of the drain device 10 is provided via the drain piping 10a. Each is connected. In the cooling device body 5a of the cooling device 5, the blower 11 is connected to the air supply port 5e through an air pipe 11a. The displacement meter 7a is connected to the screw jack 3a of the load device 3 via the control device 7. The control device 7 includes a displacement detection circuit 7b, a low-pass filter 7c, an AD converter 7d, an arithmetic device 7e, and a load control circuit. 7f is connected in series. Further, the calculation device 7e is configured to perform the calculation shown in FIG.
[0019]
The high temperature internal pressure bending creep test apparatus configured as described above operates as follows. First, before injecting water, the test body 1 operates the heating device 2 and heats the test body 1 to a predetermined temperature. By this operation, the temperature of the specimen 1 is increased.
Next, the water supply pump 4a is operated in a state where the drain stop valve 10b and the pressure detection device blow valve 9c are closed and the water supply pump outlet valve 4d is opened, and water is supplied from the water supply tank 4b to the test body 1 to obtain a predetermined pressure. The feed water pump 4a is stopped and the feed water pump outlet valve 4d is closed. By this operation, the test body 1 is filled with steam by filling the space of the gravel 1c filled in advance, and is sealed.
[0020]
When the pressure of the test body 1 is increased, the pressure inside the test body 1 is constantly monitored by the pressure detector 9a, and the pressure detection device blow valve 9c is opened and closed as necessary to increase the pressure to a predetermined pressure.
In this pressure increasing operation, the water supplied into the specimen 1 immediately becomes steam, and the gravel 1c is filled with the gravel 1c, and the gravel 1c and steam are mixed. Since the test body 1 is already heated, the pressure can be increased more easily than when the inside of the test body 1 is filled only with steam.
Then, after the temperature of the test body 1 is increased to a predetermined temperature and the internal pressure is increased to the predetermined pressure, the heating device 2 is controlled to maintain a predetermined high temperature and high pressure state of the test body 1.
[0021]
The heated specimen 1 is thermally expanded and extends in the cylindrical axis XX direction. Since the test body 1 is held by the support base 8c with a slight gap provided by a U-bolt / nut 8e slightly larger than the outer peripheral diameter thereof, it slides on the upper flat plate of the support base 8c without any resistance. extend. Further, the test body 1 is restricted from moving in the direction of the cylindrical axis XX by stoppers 6a and supports 6b provided at both ends thereof, and the position where the load device 3 acts is determined at a fixed position.
[0022]
Next, the load device 3 is operated, the screw jack 3a is pushed out, and a predetermined load is applied from the upper side to the lower point on the upper vertex of the cross section perpendicular to the cylindrical axis of the test body 1 and the fixed position in the cylindrical axis XX direction. By this operation, the specimen 1 is bent and deformed downward. At this time, the test body 1 is deformed so as to bend downward. However, the stopper 6a that determines the position of the test body 1 in the direction of the cylindrical axis XX is located at a position right next to the cylindrical axis perpendicular to the test body 1, that is, against bending. By being provided at the neutral position, the stopper 6a does not affect the contact load or the like when the specimen 1 is deformed. The magnitude of the load of the load device 3 is measured by the load cell 3b and input to the control device 7 via the calculator 3c. When the load device 3 applies a predetermined load, the operation of the load device 3 is stopped. The bending displacement amount of the test body 1 is measured by the displacement meter 7 a and input to the control device 7.
[0023]
The blower 11 is operated simultaneously with the operation of the load device 3 and is continuously operated without being stopped during the test period. By this operation, the tip of the screw jack 3a is always cooled by the cooling device body 5a. That is, the cooling air pressurized by the blower 11 is supplied into the cooling device main body 5a from the air supply port 5e through the air supply pipe 11a, and circulates in the cooling device main body 5a to cool the screw jack 3a. It is discharged from the discharge port 5f and exhausted to the atmosphere through the exhaust pipe 5g. Further, since the tip of the screw jack 3a applies a load to the test body 1 through the load-resistant heat insulating material 5b and the spacer 5d, heat conduction from the high-temperature test body 1 is insulated, and the load device 3 is It operates normally without being affected by the high temperature of 1.
[0024]
When the specimen 1 made of a steel material is maintained at a high temperature for a long time, the material undergoes a creep phenomenon. As a result, the load decreases as the strength of the material decreases. On the other hand, the test apparatus base 8 similarly made of a steel material is bent by the reaction force of the load device 3, and when the strength of the material of the test body 1 is reduced, the load of the load apparatus 3 is recovered and the test body 1 is deformed. The amount increases and normal creep tests are not performed. Therefore, in this test, the change in the load is measured while keeping the bending displacement constant, and the decrease in the material strength due to the creep phenomenon is observed. That is, as shown in FIG. 8, in the arithmetic unit 7e of the control device 7, the load target value Wo is set, the load device 3 is actuated, and the load is gradually applied to the test body 1, and the load reaches Wo. Then, the load device 3 is stopped. The amount of bending displacement when the load is Wo, that is, the displacement control target value is Lo. Thereafter, during a test period in which a predetermined high temperature and high pressure state and a state in which a load is applied are maintained, the displacement signal instantaneous value Ln is measured every predetermined time, and when (Ln−Lo)> 0.01 mm, (Ln -Lo) The load device 3 is operated until <0.005 mm, and the screw jack 3a is pulled back upward.
[0025]
After the test is completed or during the test, the drain stop valve 10b is opened in the drain device 10 and the water in the test body 1 is discharged through the drain pipe 10a.
[0026]
【Example】
A high temperature internal pressure bending creep test was carried out using the following specimens, equipment and test procedures.
Main specifications of specimen 1 Material: Steel pipe STPA24-S Sch120, end plate SFVAF22A
Shape: 500Ax4m
[0027]
Main specification format of the heating device 2: Horizontal tubular type 34 split type resistance heating system Manufacturer: Kamei factory furnace dimensions: φ700xL4,400
Furnace dimensions: φ1,000xL4,600
Maximum operating temperature: 700 ° C
Heating element: N-80 heating element control zone: 15 zones Electric capacity: 200 V 3P 56 kW
(4kWx13 zone, 2kWx2 zone)
[0028]
Main specification format of screw jack 3a: Screw jack J7A
Manufacturer: Japanese gear Maximum working load: 1,000kN
Stroke: 400mm
Output: 0.4kW
[0029]
Main specification format of water supply pump 4a: Metal diaphragm pump M411.2-20MM / 300
Manufacturer: Takumina discharge rate: 40-400 mL / min (6-60 Hz)
Maximum discharge pressure: 29MPa
Output: 1.5kW
[0030]

[0031]
Main specifications of blower 11: Vortex blower VB-003E
Manufacturer: Hitachi-made predetermined wind volume: 0.8m3 / min
Discharge static pressure: 8.5kPa
Output: 0.26kW
[0032]
Test Procedure (1) Heat the test body 1 to 630 ° C. and hold it.
(2) The inside of the test body 1 is pressurized to 6.37 MPa and held.
(3) An initial load of 500 kN is applied to the specimen 1 and bending is applied.
(4) The load is changed every week, and the load is repeatedly applied.
(5) Until the specimen 1 is destroyed (scheduled 10,000 hours), the test apparatus 1 is interrupted as appropriate (3 to 5 times) and the specimen 1 is inspected for the following items: .
a. Surface nondestructive inspection (dye penetrant inspection, magnetic particle inspection)
b. Cross-sectional nondestructive inspection (ultrasonic testing)
c. Observation of surface metal structure (collection of surface replica)
[0033]
FIG. 9 is a graph showing time-dependent changes in load and displacement by the load device when the deformation amount control of FIG. 9 is not performed; FIG. 11 is a graph showing changes in load and displacement measured by the load device when the deformation amount control in FIG. 10 is performed.
[0034]
【The invention's effect】
The high-temperature internal pressure bending creep test method and test apparatus according to the present invention are configured as described above, so that the following effects can be obtained.
(1) Supporting both ends of the test piece, which is a cylindrical pressure vessel, with the cylindrical shaft horizontally disposed, heating the test piece from the outer periphery to maintain a predetermined temperature, and injecting water into the test piece High temperature internal pressure bending that can add bending stress conditions by generating steam and holding it at a predetermined pressure, and continuing the state of applying a load from the top to the bottom in the cylindrical axial direction center of the specimen for a long time. A creep test can be performed.
[0035]
(2) A normal creep test can be performed by keeping the amount of bending displacement due to the load applied to the specimen constant.
(3) A displacement meter is provided that is fixedly supported on the test apparatus base, and the displacement meter is arranged so as to be able to measure the displacement of the outer periphery of the top of the test body in the cross section perpendicular to the cylindrical axis, and the displacement meter is connected to the control device. This makes it possible to easily implement a test for keeping the bending displacement constant.
[0036]
(4) A cylindrical shaft on which the support base of the test apparatus frame holds the test body placed on the support base and can be contacted by a stopper provided at a position directly beside the outer circumference in the cross section perpendicular to the cylindrical axis of the test body The U-bolt supported by the support is provided in the direction, and the cylindrical shaft inner axis of the U-bolt between the supports provided on the two support bases is provided near the both ends in the cylindrical axis direction of the test specimen. It is possible to obtain a test result without disturbance because the distance is larger than the outer distance in the direction and the difference between the two distances is determined by adding an allowable value to the movement distance of the stopper in the heated state. It was.
[0037]
(5) Since the cooling device is connected to the load device, the load device can be accurately tested without being affected by the high temperature of the specimen.
(6) With the test method and test apparatus according to the present invention, as shown in FIG. 10, it is possible to measure a change in load when the displacement amount is constant.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional front view showing a high-temperature internal pressure bending creep test apparatus main body and a test body installed in the test apparatus according to the present invention.
FIG. 2 is a side view taken along the arrow II in FIG.
FIG. 3 is a partial cross-sectional front view showing a test body.
FIG. 4 is a partial front view showing an installation state of an end portion of a test body.
FIG. 5 is a side view taken along the arrow V in FIG. 4;
FIG. 6 is a side view showing an installation state of a tip portion of the load device.
FIG. 7 is a system diagram showing a high-temperature internal pressure bending creep test apparatus.
FIG. 8 is a flowchart showing a load addition control method of the high-temperature internal pressure bending creep test apparatus.
FIG. 9 is a graph showing changes in time of load and displacement by a load device when deformation amount control is not performed.
FIG. 10 is a graph showing changes in time of load and displacement by the load device when deformation amount control is performed.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Test body 1a Steel pipe 1b End plate 1c Gravel 2 Heating device 3 Loading device 3a Screw jack 3b Load cell 3c Calculator 4 Water supply device 4a Water supply pump 4b Water supply tank 4c Water supply piping 4d Water supply pump outlet valve 5 Cooling device 5a Cooling device body 5b Load resistance Heat insulating material 5c Mounting bracket 5d Spacer 5e Air supply port 5f Air discharge port 5g Exhaust piping 6 Stopper device 6a Stopper 6b Support 7 Control device 7a Displacement meter 7b Displacement detection circuit 7c Low pass filter 7d AD converter 7e Arithmetic device 7f Load control circuit 7g Displacement meter mounting base 8 Test device base 8a Bed 8b Device fixing beam 8c Support base 8d Post 8e U bolt / nut 9 Pressure detection device 9a Pressure detector 9b Pressure detection piping 9c Pressure detection device blow valve 10 Drain device 10a Drain piping 10b Drain Stop valve 11 Blower 1 a gas supply pipe

Claims (6)

The cylindrical shaft of the test body, which is a cylindrical pressure vessel, is supported horizontally at both ends, and the test body is heated from the outer periphery, and then water is injected into the test body to generate steam. A high-temperature internal-pressure bending creep test method characterized in that a state in which the vapor pressure is maintained at a predetermined pressure and the state in which the load is applied to the central portion in the cylindrical axial direction of the test body from above is maintained for a long time. 2. The high temperature internal pressure bending creep test method according to claim 1, wherein a bending displacement amount due to a load applied to the test body is kept constant. Two support bases for supporting both ends in the cylindrical axis direction of the test body which is a cylindrical pressure vessel, a test apparatus base having a device fixing beam above the center part of the cylindrical axis of the test body, and covering the outer periphery of the test body A high-temperature internal pressure bending creep comprising a heating device provided, a water supply device connected to the test body, a drain device and a pressure detection device, and a load device fixed to the device fixing beam and acting downward Test equipment. A displacement meter is fixedly supported on the displacement meter mounting base, the displacement meter is arranged so as to be able to measure the displacement of the outer periphery of the top in the cross section perpendicular to the cylindrical axis of the test body, and the displacement meter is connected to the control device. The high temperature internal pressure bending creep test apparatus according to claim 3. The support base of the test apparatus base holds the test body mounted on the support base, and a stopper provided at a position directly beside the outer periphery of the cross section of the test body at a right angle to the cylindrical axis can contact. A U-bolt supported by a support is provided in the cylindrical axis direction, and an inner distance in the cylindrical axis direction between the U-bolts provided on the two support bases is provided near both ends of the test specimen in the cylindrical axis direction. The outer distance of the stopper in the cylindrical axis direction is larger, and the difference between the two distances is determined by adding an allowable value to the movement distance of the stopper in a heated state. The high-temperature internal pressure bending creep test apparatus according to claim 3 and claim 4. 6. The high temperature internal pressure bending creep test apparatus according to claim 3, wherein a cooling device is connected to the load device.

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