发明名称 |
METHOD AND DEVICE FOR DIAGNOSING REMAINING SERVICE LIFE |
摘要 |
PROBLEM TO BE SOLVED: To judge the remaining service life of an ORV until a crack occurs in a finned tube caused by accumulation of fatigue due to comparatively gradual and mechanical stress such as a bowing phenomenon occurring in association with generation of thermal stress in a long header tank. SOLUTION: Destructive inspection is performed to accurately measure how much remaining service life is left in the ORV from distortion slowly accumulated during a long period of ten years or more. At least one tube for heat exchange joined to the header tank is cut away from this tank along with a welding bead part, a welded part of the tube is bonded and fixed by putty to a fixture for testing, a vibration exciter is connected to an unbonded other end side of the tube to be tested for applying a required vibration until damage occurs in the tube near the welded part, it is counted until pressure of gas filled inside the tube reduces, and it is compared with a cycle until damage of a preset model or a predetermined fatigue occurs for measuring the remaining service life.
|
申请公布号 |
JP2001159578(A) |
申请公布日期 |
2001.06.12 |
申请号 |
JP19990341850 |
申请日期 |
1999.12.01 |
申请人 |
SUMITOMO PRECISION PROD CO LTD;TOKYO GAS CO LTD |
发明人 |
SHOTANI HITONOBU;AKIYAMA MASARU;IKEDA SEIDO;SAWARA KAZUYA;NAGANO KENZO;TAMARU HIDEO |
分类号 |
G01N33/20;F28F9/02;F28F9/26;G01M7/02;(IPC1-7):G01M7/02 |
主分类号 |
G01N33/20 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|