Evaluation of Tube Wall Thickness of Feed Water Heater
With regard to HP feed water heater of thermal power plant at TEPCO sites, inspection of FW tubes wall thickness are conducted whenever required such that frequent tube leak occurs. As a standard inspection methodology, FW heater is disassembled during planned outage, tube wall thickness is measured by UT, then plugs are installed at the both ends of FW tube if its measured wall thickness is found below calculated threshold. However, the root causes of wall thinning of FW tube are various such as erosion and corrosion, based on wall thinning condition, the above threshold is not applied but utilizing the other technically well-grounded evaluation method is sometimes more rational. Therefore, TEPCO classified wall-thinning condition based on inspection data and established technically well-grounded and rational evaluation methodologies of FW tube wall thickness to suite each wall thinning condition. Moreover, with recent improvement of inspection technique, technology enabled faster, larger amount, and more accurate data acquisition, TEPCO has developed the systematized evaluation methodology that can transact data acquisition and evaluation simultaneously. This article introduces the logic of evaluation methods and examined algorithms to make them systematized.
Feed water heater Tube wall thickness The logic of evaluation methods
Takahisa Uchikura Kouichi Morisaki Seiichi Hamada
Thermal Power Plant Engineering Center Thermal Power Department TOKYO ELECTRIC POWER COMPANY, 1-3-3 UCHISAIWAI-CHO, CHIYODA-KU, TOKYO 100-8560 JAPAN
国际会议
2007杭州国际动力工程会议(The International Conference on Power Engineering 2007)
杭州
英文
2007-10-23（万方平台首次上网日期，不代表论文的发表时间）