経年ボイラ配管の高精度余寿命診断手法の確立

抄録

For high accuracy residual life assessments, and prolongation periodical inspection for high-temperature parts in boilers,there are a lot of needs finding maximum damage parts for large size pipes in boiler.

We developed method for measuring by laser instrument using elastic analysis by FEM and creep damage analysis by one and observed cross section cut scrap in service plants. Result of this FEM Analysis and this section microstructure are very similar. Our created method is accuracy and and simple.

At the present time, many Boiler are made by 2.25％Cr steel for thermal power station in Japan . these power station have been in operation for a total of over 100,000 hours, Actual-Size Burst Equipment capable of reproducing actual equipment damage (Type IV damage)and FEM are used to solve this burst mechanism.

Residual Life Assessment Method from middle Life able to use Welding part at 2.25%Cr steels was developed. Type IV mechanism for 2.25％Cr Welding Part was solved.

In conclusion, We developed high accuracy Residual Life Diagnosis Method using MonkmanGrant and method in 2.25％Cr steel