Creep behavior of seam-welded reheat steam pipes in thermal fossil power plant: feedback analysis and life assessment methodology

As a number of aged fossil power plants recently increased, the precise life assessment of critical equipments gets to be important more than ever. Despite of infrequent likelihood of failure, the equipments in high pressure and temperature operation condition have traditionally been considered as critical because of huge consequence of the equipments and hence life assessment of fossil power plant has been focused on all of the severe operated equipments for past decades. Nowadays, with Risk-Based Inspection technology being developed rapidly, most of the power plant utilities get a chance to reduce the scope of the inspection and test and to extend the interval for the life assessment. This paper provides methodology based on Risk-Based Inspection technology to optimize the life assessment work scope and interval and also demonstrates the enhanced life assessment procedure including risk assessment of equipments.

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Creep Damage and Life Assessment of Fossil Power Plant.

JOURNAL OF THE JAPAN WELDING SOCIETY ◽

10.2207/qjjws1943.67.339 ◽

1998 ◽

Vol 67 (4) ◽

pp. 339-342

Author(s):

Toshio SAKON

Keyword(s):

Power Plant ◽

Creep Damage ◽

Life Assessment ◽

Fossil Power Plant

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Progress in life assessment and design methodology for fossil power plant components

International Journal of Pressure Vessels and Piping ◽

10.1016/0308-0161(94)90093-0 ◽

1994 ◽

Vol 57 (1) ◽

pp. 7-20 ◽

Cited By ~ 13

Author(s):

T. Endo

Keyword(s):

Power Plant ◽

Design Methodology ◽

Life Assessment ◽

Fossil Power Plant ◽

Plant Components

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Application of Continuous Indentation Technique in Thermal Power Plant

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.26-28.1149 ◽

2007 ◽

Vol 26-28 ◽

pp. 1149-1152

Author(s):

Doo Song Gil ◽

Yeon Shik Ahn ◽

Sang Ki Park

Keyword(s):

Power Plant ◽

Thermal Power Plant ◽

Thermal Power ◽

Indentation Technique ◽

Stiffness Evaluation ◽

Reheat Steam ◽

Main Steam ◽

Continuous Indentation ◽

Steam Pipes ◽

Service Inspection

Reliability evaluation of the welded structure is divided by method concentrating on defect and mechanical property. Thermal power plant facilities are operated in high temperature, high pressure and called for safety guarantee. Three factors are constituted for this. The First is PSI(pre-service inspection) and the second is ISI(in-service inspection) and the third is quantitative analysis in safety. Main steam and hot reheat steam pipes in thermal power plant are frequently making a trouble because of unsuitable quality control under construction. So, the suitable construction and the development of life forecast method is urgent matter. Therefore, the continuous indentation technique is interested in effective test method of pipes in power plant facilities. This strong point of the continuous indentation technique is possibility of super-precision measurement, programmed test analysis, nondestructive stiffness evaluation. This study is focused on the possibility of the continuous indentation technique application in main steam and hot reheat steam pipes for stiffness evaluation in thermal power plant facilities.

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