WO2019188887A1 - 配管の余寿命評価方法 - Google Patents

配管の余寿命評価方法 Download PDF

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Publication number
WO2019188887A1
WO2019188887A1 PCT/JP2019/012329 JP2019012329W WO2019188887A1 WO 2019188887 A1 WO2019188887 A1 WO 2019188887A1 JP 2019012329 W JP2019012329 W JP 2019012329W WO 2019188887 A1 WO2019188887 A1 WO 2019188887A1
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WIPO (PCT)
Prior art keywords
pipe
remaining life
circumference
heat transfer
evaluation
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PCT/JP2019/012329
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English (en)
French (fr)
Japanese (ja)
Inventor
憩太 橋本
駒井　伸好
平川　裕一
紘 有末
伸彦 齋藤
今里　敏幸
真太郎 松本
顕一 田▲崎▼
Original Assignee
三菱日立パワーシステムズ株式会社
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Application filed by 三菱日立パワーシステムズ株式会社 filed Critical 三菱日立パワーシステムズ株式会社
Priority to CN201980017388.7A priority Critical patent/CN111919104A/zh
Publication of WO2019188887A1 publication Critical patent/WO2019188887A1/ja
Priority to PH12020551595A priority patent/PH12020551595A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light

Definitions

  • This disclosure relates to a method for evaluating the remaining life of piping.
  • Some pipes used in high-heat equipment such as boilers are used for a long time under high temperature and high pressure, such as heat transfer tubes of boilers.
  • the remaining life is evaluated in a periodic inspection or the like. For example, in the creep life evaluation method described in Patent Document 1, when the outer diameter of a boiler heat transfer tube is measured and the measured outer diameter has reached a predetermined reference value, the boiler heat transfer tube is at a replacement repair time. I am trying to judge.
  • Patent Document 1 does not mention a specific method for measuring the outer diameter of the boiler heat transfer tube.
  • the heat transfer tube temperature may be different between the upstream position and the downstream position of the combustion gas flow. It is also conceivable that the state of deformation of the heat transfer tube to the radially outer side varies depending on the position in the circumferential direction, such as the portion bulging radially outward.
  • the outer diameter of the heat transfer tube depends on the circumferential position to be measured. Since the measured values are different, there is a possibility that the state of deformation of the heat transfer tube toward the outside in the radial direction is not properly reflected in the measured value of the outer diameter. Therefore, the deformation state of the heat transfer tube toward the radially outer side cannot be properly grasped, and the evaluation accuracy of the remaining life of the heat transfer tube may be lowered.
  • At least one embodiment of the present invention aims to improve the accuracy of the remaining life evaluation of piping.
  • the remaining life evaluation method for piping is: Measuring the circumference of the outer circumference of the pipe to be evaluated; Evaluating the remaining life of the pipe to be evaluated by inputting the circumference obtained by measuring the correlation between the circumference of the outer periphery of the pipe and the remaining life of the pipe; Is provided.
  • the above method (1) by measuring the circumference of the outer circumference of the evaluation target pipe, even if the deformation state of the evaluation target pipe toward the radially outer side varies depending on the position in the circumferential direction, It is possible to obtain a measurement value reflecting the deformation state. Thereby, the deformation
  • the diameter of a member having a circular cross section changes, the amount of change in circumferential length is larger than the amount of change in diameter.
  • the evaluation accuracy of the remaining life of the pipe to be evaluated can be improved. Furthermore, since the remaining life of the evaluation target pipe can be evaluated by a simple method of measuring the circumference of the outer periphery of the evaluation target pipe, the time required for measurement can be shortened.
  • a linear or belt-like measurement jig that can be wound around the outer circumference of the pipe is used. At least one turn is wound around the outer periphery of the evaluation target pipe, and the peripheral length of the outer periphery of the evaluation target pipe is determined from the length of the measurement jig wound around the outer periphery of the evaluation target pipe.
  • the circumference of the outer circumference of the pipe to be evaluated can be easily measured by using a linear or strip-shaped measuring jig that can be wound around the outer circumference of the pipe. Moreover, even in a narrow place where it is difficult to use a measuring device such as a caliper, such as when a plurality of evaluation target pipes are arranged close to each other, the outer periphery of the evaluation target pipe The circumference can be measured.
  • the measurement jig in the step of measuring the circumference of the outer circumference of the evaluation target pipe, is wound around the outer circumference of the evaluation target pipe two or more times, The circumference of the outer periphery of the evaluation target pipe is determined based on the length of the measurement jig wound around the outer periphery of the evaluation target pipe and the frequency of winding the measurement jig around the evaluation target pipe.
  • the measurement range of the circumference of the evaluation target pipe can be expanded in the axial direction by winding the measurement jig around the outer periphery of the evaluation target pipe two or more times.
  • the measurement range of the circumference of evaluation object piping by one measurement can be expanded in the direction of an axis. Therefore, for example, even when the radially outward deformation of the evaluation target pipe occurs in a part of the axial direction, it is easy to grasp that the evaluation target pipe is deformed radially outward.
  • the evaluation in the step of measuring the circumference of the outer periphery of the evaluation target pipe, the evaluation is performed so that the measurement jig is displaced in the axial direction of the evaluation target pipe. Two or more turns are wound around the outer periphery of the target pipe, the length of the measurement jig wound around the outer periphery of the evaluation target pipe, the amount of displacement of the measurement jig in the axial direction, and the measurement jig is wound around the evaluation target pipe The circumference of the outer circumference of the pipe to be evaluated is obtained based on the obtained circumference.
  • the measurement range of the circumference of the evaluation target pipe by one measurement is obtained by winding the measurement jig around the outer periphery of the evaluation target pipe so as to be displaced in the axial direction of the evaluation target pipe. Can be further expanded in the axial direction.
  • the remaining life of the evaluation target pipe evaluated in the step of evaluating the remaining life of the evaluation target pipe is equal to or less than a threshold value.
  • the method further includes a step of re-evaluating the remaining life of the pipe to be evaluated.
  • the remaining life of the evaluation target pipe is evaluated by a simple method of measuring the circumference of the outer periphery of the evaluation target pipe, and a more detailed evaluation of the remaining life is performed based on the evaluation result. Can be re-evaluated when it is determined that is necessary. Thereby, shortening of the measurement time for the remaining life evaluation of evaluation object piping and the improvement of the precision of remaining life evaluation are realizable.
  • the step of re-evaluating the remaining life of the evaluation target pipe is an inspection result obtained by an inspection method for inspecting the evaluation target pipe in a nondestructive manner. Based on the above, the remaining life of the evaluation target pipe is re-evaluated.
  • the method of any one of (1) to (6) further includes the step of acquiring the correlation.
  • FIG. 4A It is a figure which shows schematic structure of a boiler. It is a figure which shows the structure of a superheater typically. It is a flowchart which shows the schematic procedure of the remaining life evaluation method of piping which concerns on some embodiment. It is a figure for demonstrating the measurement of the perimeter of the outer periphery of a heat exchanger tube, and is a figure which shows an example of a measurement jig. It is a figure which shows a mode that the measurement jig
  • an expression indicating that things such as “identical”, “equal”, and “homogeneous” are in an equal state not only represents an exactly equal state, but also has a tolerance or a difference that can provide the same function. It also represents the existing state.
  • expressions representing shapes such as quadrangular shapes and cylindrical shapes represent not only geometrically strict shapes such as quadrangular shapes and cylindrical shapes, but also irregularities and chamfers as long as the same effects can be obtained. A shape including a part or the like is also expressed.
  • the expressions “comprising”, “comprising”, “comprising”, “including”, or “having” one constituent element are not exclusive expressions for excluding the existence of the other constituent elements.
  • FIG. 1 is a diagram illustrating a schematic configuration of a boiler 10.
  • the boiler 10 has a combustion furnace 12 and a flue 14 connected to the upper part of the combustion furnace 12.
  • the furnace wall 16 of the combustion furnace 12 includes an evaporation pipe for heating water, and a superheater 18 for superheating steam is disposed at the upper part of the combustion furnace 12.
  • a economizer 20 for preheating water is disposed below the flue 14.
  • a reheater 22 for reheating the steam is disposed on the upper portion of the flue 14.
  • a burner 24 is attached to the combustion furnace 12, and pulverized coal and air as fuel are supplied to the burner 24.
  • High-temperature exhaust gas generated by burning pulverized coal ejected from the burner 24 rises in the combustion furnace 12 and flows into the flue 14.
  • the heat generated by the combustion is transferred to the evaporator tube of the furnace wall 16, thereby heating the water.
  • the heat of the exhaust gas is used to superheat the steam in the superheater 18, reheat the steam in the reheater 22, and preheat water in the economizer 20.
  • the exhaust gas that has become low temperature flows into a denitration device provided downstream of the boiler 10, for example, and is purified.
  • the steam (main steam) superheated by the superheater 18 is supplied to, for example, the steam turbine 26 and used for power generation or the like.
  • FIG. 2 is a diagram schematically showing the configuration of the superheater 18.
  • the superheater 18 includes an inlet header 18A, an outlet header 18C, and a plurality of superheater tubes (heat transfer tubes) 18B.
  • a plurality of heat transfer tube panels 18 ⁇ / b> D in which a plurality of heat transfer tubes 18 ⁇ / b> B are arranged in a substantially U shape and a plane are arranged so as to be aligned in the extending direction of the headers 18 ⁇ / b> A and 18 ⁇ / b> C. .
  • the remaining life is evaluated in a periodic inspection or the like in order to confirm the soundness of the heat transfer tubes.
  • the outer diameter of the heat transfer tube is measured, and if the measured outer diameter reaches a predetermined reference value, the heat transfer tube is replaced. It is determined that it is time to repair. That is, in the heat transfer tubes such as the superheater 18 and the reheater 22, when creep strain accumulates as creep progresses, about 80% of the creep life, that is, about 80% of the life consumption rate of the heat transfer tube has elapsed.
  • the life consumption rate of the heat transfer tube can be estimated nondestructively and simply by examining how much the outer diameter of the heat transfer tube has increased before the start of use of the superheater 18, reheater 22, and the like.
  • the position on the upstream side of the flow of the combustion gas and the position on the downstream side may cause the temperature of the heat transfer tube to be different. It is also conceivable that the state of deformation of the heat transfer tube to the radially outer side varies depending on the position in the circumferential direction, such as the portion bulging radially outward.
  • the state of deformation of the heat transfer tube toward the radially outer side varies depending on the position in the circumferential direction, for example, when the outer diameter of the heat transfer tube is measured by a measuring device such as a caliper, the outer diameter is Since the measured values are different, there is a possibility that the state of deformation of the heat transfer tube toward the outside in the radial direction is not properly reflected in the measured value of the outer diameter. Therefore, the deformation state of the heat transfer tube toward the radially outer side cannot be properly grasped, and the evaluation accuracy of the remaining life of the heat transfer tube may be lowered.
  • the temperature, flow velocity, and flow direction of the combustion gas in the boiler 10 vary depending on the location. Therefore, even if it is the same heat exchanger tube, there exists a possibility that the temperature of a heat exchanger tube may differ greatly in the position where an axial direction differs.
  • FIG. 3 is a flowchart showing a schematic procedure of a pipe remaining life evaluation method according to some embodiments.
  • the remaining life evaluation target pipe (evaluation target pipe) is a heat transfer pipe of the superheater 18 or the reheater 22 like the heat transfer pipe 18B of the superheater 18, for example.
  • the pipe remaining life evaluation method includes a correlation acquisition step S10, a circumference measurement step S20, a remaining life evaluation step S30, and a remaining life re-evaluation step S50.
  • the correlation acquisition step S10 is a step of acquiring the correlation between the outer circumference of the pipe and the remaining life of the pipe.
  • the correlation between the outer circumference of the pipe and the remaining life of the pipe varies depending on the material, diameter, thickness, etc. of the pipe. Therefore, in the correlation acquisition step S10, for example, a correlation between the outer circumference of the pipe and the remaining life of the pipe is acquired by referring to experimental data and literature.
  • the correlation between the circumference of the outer periphery of the pipe acquired in the correlation acquisition step S10 and the remaining life of the pipe is, for example, the life consumption rate of the creep life when the life of the creep life is 100% when the pipe breaks due to creep. And the perimeter of the outer periphery of the pipe.
  • the correlation obtaining step S10 does not need to be performed again when evaluating the remaining life of the subsequent pipe.
  • the above-mentioned correlation is acquired using the same kind of metal material as the heat transfer pipe 18B that is the evaluation target pipe, whereby the evaluation accuracy of the remaining life of the evaluation target pipe can be improved.
  • the circumference measurement step S20 is a step of measuring the circumference of the outer circumference of the heat transfer tube that is the evaluation target pipe.
  • a linear or strip-shaped measurement jig that can be wound around the outer periphery of the pipe is wound around the outer periphery of the heat transfer tube that is the evaluation target pipe at least once.
  • the circumference of the outer periphery of a heat exchanger tube is calculated
  • the circumference measurement may be performed on all the heat transfer tubes 18B, for example, and is arranged in a place where a thermal load is large according to a period during which the superheater 18 is used or an operation condition.
  • the heat transfer tube 18B may be implemented.
  • the measurement of the circumference may be performed at a predetermined interval over the entire length of the single heat transfer tube 18B, or may be performed at a predetermined interval only within a large thermal load range. .
  • FIG. 4A is a diagram for explaining the measurement of the circumference L of the outer periphery of the heat transfer tube 18B, and is a diagram illustrating an example of the measurement jig 30.
  • FIG. FIG. 4B is a diagram illustrating a state in which the measurement jig 30 illustrated in FIG. 4A is wound around the outer periphery of the heat transfer tube 18B.
  • the measurement jig 30 shown in FIG. 4A is a strip-shaped member having flexibility, for example.
  • the measurement jig 30 may be a linear (string-like) member having flexibility.
  • the measuring jig 30 can be wound around the outer periphery of the heat transfer tube 18B, which is the evaluation target pipe, and can measure the outer circumference L of the heat transfer tube 18B directly or indirectly as described below.
  • the form and shape are not limited to those illustrated in FIG. 4A.
  • the end portions 31 do not have to be shifted in the axial direction of the heat transfer tube 18B.
  • a part in the width direction may be cut off at the end 31 so as not to overlap in the thickness direction of the measuring jig 30.
  • a general tape measure may be used instead of using the measurement jig 30 as shown in FIG. 4A for measuring the circumference of the outer periphery of the heat transfer tube 18B.
  • the measurement jig 30 shown in FIG. 4A when used, as shown in FIG. 4B, the measurement jig 30 is wound around the outer circumference of the heat transfer tube 18B. And in the state which wound the measurement jig 30 around the outer periphery of the heat exchanger tube 18B, as shown in FIG. 5A, the circumferential direction of the heat exchanger tube 18B with respect to both the one end portion 31 and the other end portion 31.
  • the mark 38 is marked at the same position, for example, with an oil pen 39 or the like. Then, the measuring jig 30 is removed from the heat transfer tube 18B and stretched in a flat place. As shown in FIG.
  • the length between the mark 38 attached to one end 31 and the mark 38 attached to the other end 31 is obtained. Measure.
  • the circumferential length L of the heat transfer tube 18B can be indirectly measured.
  • a scale 35 corresponding to, for example, a caliper main scale is attached in advance to one end portion 31 of the measuring jig 30, and the other end portion 31 corresponds to, for example, a caliper sub-scale.
  • the scale 36 may be attached in advance.
  • the circumference L can be directly read from the scale in a state where the measurement jig 30 is wound around the outer periphery of the heat transfer tube 18B. It may be.
  • FIG. 5A is a diagram for explaining the measurement of the peripheral length L of the outer periphery of the heat transfer tube 18B using the measurement jig 30, and illustrates how the mark 38 is marked on the measurement jig 30 wound around the heat transfer tube 18B.
  • FIG. 5B is a diagram illustrating a state in which the circumferential length L of the heat transfer tube 18B is measured after the mark 38 is applied as illustrated in FIG. 5A.
  • FIG. 5C is a diagram for describing reading of the circumferential length L of the heat transfer tube 18B from the scales 35 and 36 previously attached to the end portion 31 of the measurement jig 30.
  • the outer circumferential length L of the heat transfer tube 18B which is the evaluation target piping, is measured, whereby the heat transfer tube 18B is deformed outward in the radial direction. Even if is different depending on the position in the circumferential direction, it is possible to obtain a measurement value reflecting the state of deformation outward in the radial direction. Thereby, the deformation
  • the amount of change in circumferential length is larger than the amount of change in diameter. Therefore, it becomes easier to grasp the change in the diameter of the heat transfer tube 18B than in the case where the diameter is directly measured by a measuring device such as a caliper. Also from this point, the evaluation accuracy of the remaining life of the heat transfer tube 18B can be improved.
  • the remaining life evaluation method of piping which concerns on some embodiment is applicable with respect to piping of various materials, such as austenitic stainless steel and a nickel base alloy, besides ferritic steel.
  • the pipe remaining life evaluation method for piping is suitable for evaluating the remaining life of pipes such as austenitic stainless steel and nickel-based alloys. Furthermore, since the remaining life of the heat transfer tube 18B can be evaluated by a simple method of measuring the circumference L of the outer periphery of the heat transfer tube 18B, the time required for measurement can be shortened.
  • the circumferential length L of the outer periphery of the heat transfer tube 18B can be easily measured by using a linear or strip-shaped measuring jig 30 that can be wound around the outer periphery of the piping.
  • a measuring device such as a caliper as in the case where a plurality of heat transfer tubes are arranged close to each other like the heat transfer tubes of the superheater 18 and the reheater 22. Even in a narrow place, the circumference L of the outer periphery of the heat transfer tube can be measured.
  • FIG. 6 is a diagram for explaining another embodiment of pipe circumference measurement in the pipe remaining life evaluation method according to some embodiments.
  • the measurement jig 30 is wound around the outer periphery of the heat transfer tube 18B, which is the evaluation target pipe, by two or more turns, and the measurement jig 30 is wound around the outer periphery of the heat transfer tube 18B.
  • the circumference L of the outer periphery of the heat transfer tube 18B may be obtained based on the circumference around which the measurement jig 30 is wound around the heat transfer tube 18B.
  • FIG. 6 schematically shows a state where the measurement jig 30 is wound around the heat transfer tube 18B twice.
  • the measurement range of the circumferential length L of the heat transfer tube 18B can be expanded in the axial direction of the heat transfer tube 18B.
  • the measurement range of the circumference L of the heat transfer tube 18B by one measurement can be expanded in the axial direction of the heat transfer tube 18B. Therefore, for example, even when the heat transfer tube 18B is deformed radially outward in a part of the axial direction, it is easy to grasp that the heat transfer tube 18B is deformed radially outward.
  • the measurement jig 30 is wound around the outer circumference of the heat transfer tube 18B so as to be displaced in the axial direction of the heat transfer tube 18B, and the measurement jig 30 is attached to the heat transfer tube 18B.
  • a peripheral length L of the outer periphery of the heat transfer tube 18B is obtained based on the length La wound around the outer periphery, the shift amount Z of the measurement jig 30 in the axial direction, and the circumference N of the measurement jig 30 wound around the heat transfer tube 18B. May be.
  • the circumference L can be obtained by the following equation (1).
  • the shift amount Z is a distance in the axial direction between the start point and the end point at which the measurement jig 30 measures the length La wound around the outer periphery of the heat transfer tube 18B.
  • the measurement jig 30 is wound around the outer periphery of the heat transfer tube 18B so as to be displaced in the axial direction of the heat transfer tube 18B, whereby the measurement range of the peripheral length L of the heat transfer tube 18B by one measurement is made. It can be further expanded in the axial direction. Therefore, even when the heat transfer tube 18B bulges locally in the axial direction, it is easy to detect the deformation outward in the radial direction.
  • the remaining life of the heat transfer tube 18B is evaluated in the remaining life evaluation step S30.
  • the circumference L obtained by measuring in the circumference measurement step S20 is input to the correlation between the circumference of the outer circumference of the pipe acquired in the correlation acquisition step S10 and the remaining life of the pipe.
  • the remaining life of the heat transfer tube 18B is evaluated.
  • the relationship between the lifetime consumption rate of the creep life obtained in the correlation obtaining step S10 and the circumference is obtained by measuring the circumference obtained in the circumference measurement step S20. By inputting the length L, the lifetime consumption rate of the heat transfer tube 18B is calculated. And the remaining lifetime of the heat exchanger tube 18B can be evaluated from the calculated lifetime consumption rate.
  • step S40 it is determined whether or not the remaining life of the heat transfer tube 18B evaluated in the remaining life evaluation step S30 is equal to or less than a threshold value.
  • Ta [time] be the period from the time of the periodic inspection of the boiler 10 this time when the circumference measurement step S20 is performed to the next periodic inspection (next periodic inspection). If the remaining life of the heat transfer tube 18B is less than the Ta [time] in the periodic inspection of the boiler 10 this time, if the heat transfer tube 18B is not repaired or not in the current periodic inspection, the heat transfer tube 18B There is a risk of creep rupture before the next periodic inspection. However, even if the remaining life of the heat transfer tube 18B exceeds the Ta [time] in the periodic inspection of the boiler 10 this time, in consideration of the accuracy of the remaining life evaluation, the heat transfer tube 18B is more than the time of the next periodic inspection. There is a risk of creep rupture at a near point.
  • the threshold value is, for example, one or more for giving a further tolerance to a value (2 ⁇ Ta) that is twice the Ta [time] that is the period until the next periodic inspection.
  • a value (2 ⁇ c ⁇ Ta) is multiplied by a coefficient c (c> 1).
  • step S40 it is determined whether or not the remaining life of the heat transfer tube 18B evaluated in the remaining life evaluation step S30 is equal to or less than the threshold (2 ⁇ c ⁇ Ta) set as described above.
  • the threshold (2 ⁇ c ⁇ Ta) set as described above.
  • step S40 determines that the remaining life of the heat transfer tube 18B evaluated in the remaining life evaluation step S30 is equal to or less than the threshold (2 ⁇ c ⁇ Ta)
  • the heat transfer tube 18B is creep ruptured until the next periodic inspection. Therefore, in the remaining life re-evaluation step S50, the remaining life of the heat transfer tube 18B is re-evaluated.
  • the remaining life re-evaluation step S50 re-evaluates the remaining life of the heat transfer tube 18B when the remaining life of the heat transfer tube 18B evaluated in the remaining life evaluation step S30 is equal to or less than the threshold value, that is, more This is a step for evaluating the remaining life in detail.
  • a method for re-evaluating the remaining life of the heat transfer tube 18B for example, a replica of the surface of the heat transfer tube 18B is collected, and creep damage is evaluated from changes in the microscopic structure of members such as creep voids and precipitates.
  • Non-destructive inspection methods such as a replica method, an ultrasonic method using ultrasonic waves, or an electric resistance method evaluated by a change in electric resistance can be given.
  • the remaining life of the heat transfer tube 18B is evaluated in more detail by the inspection method described above. For example, if the re-evaluated remaining life exceeds the Ta [time] with some allowance, it can be determined that the heat transfer tube 18B will not creep rupture until the next periodic inspection. In this case, measures such as repair for the heat transfer tube 18B are not performed. Further, for example, if the re-evaluated remaining life does not exceed the Ta [time] with a certain amount of room, repair or the like for the heat transfer tube 18B is performed.
  • step S50 depending on whether or not the remaining life of the re-evaluated heat transfer tube 18B is equal to or less than the threshold value (2 ⁇ c ⁇ Ta) set in step S40 described above, You may make it judge the necessity of countermeasures, such as repair.
  • the remaining life of the heat transfer tube 18B is evaluated by a simple method of measuring the circumference L of the outer periphery of the heat transfer tube 18B that is the evaluation target pipe, and based on the evaluation result.
  • the remaining life of the heat transfer tube 18B can be re-evaluated. Thereby, shortening of the measurement time for the remaining life evaluation of the heat exchanger tube 18B and improvement in the accuracy of the remaining life evaluation can be realized.
  • the remaining life of the heat transfer tube 18B can be re-evaluated based on the inspection result obtained by the non-destructive inspection method for inspecting the heat transfer tube 18B. This eliminates the need to extrude a part of the evaluation target pipe for the inspection in the equipment including the evaluation target pipe such as the superheater 18 and the reheater 22, thereby suppressing the time and cost required for the inspection. it can.
  • the present invention is not limited to the above-described embodiments, and includes forms obtained by modifying the above-described embodiments and forms obtained by appropriately combining these forms.
  • the heat transfer tube 18B is inspected by the nondestructive inspection method in the remaining life re-evaluation step S50, but the heat transfer tube 18B is removed in the remaining life re-evaluation step S50. Then, the heat transfer tube 18B may be inspected.

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PCT/JP2019/012329 2018-03-28 2019-03-25 配管の余寿命評価方法 WO2019188887A1 (ja)

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PH12020551595A PH12020551595A1 (en) 2018-03-28 2020-09-23 Remaining life evaluation method for tube

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