Remaining life of high-energy piping systems using equivalent stress
- Aptech Engineering Services, Inc., Sunnyvale, CA (US)
This paper reports on fossil power plant high-energy piping systems operated at high temperatures subject to creep damage, which is a time-dependent phenomenon. Traditional guidelines, such as the American Society of Mechanical Engineers (ASME) B31.1 Power Piping Code, were developed for plants having design lives in the 25--30 yr regime. Since many of these systems are being operated beyond 200,000 hr, it is important to reconsider the methodology of creep damage analysis to assure reliable long-term operation. Seven high-energy piping systems were evaluated in this study. The analysis of a minimum piping system life due to creep considered two approaches. The first approach used the traditional ASME B31.1 flexibility analysis guidelines. The second approach considered more detailed multiaxial stress state types of evaluations. The various equivalent stress methods used all six load components from the flexibility analysis.
- OSTI ID:
- 5727202
- Journal Information:
- Journal of Pressure Vessel Technology; (United States), Vol. 112:3; ISSN 0094-9930
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
20 FOSSIL-FUELED POWER PLANTS
FOSSIL-FUEL POWER PLANTS
PIPELINES
DESIGN
CREEP
DYNAMIC LOADS
FLEXURAL STRENGTH
PERFORMANCE TESTING
SERVICE LIFE
STRESSES
TEMPERATURE EFFECTS
TEMPERATURE RANGE 0400-1000 K
TIME DEPENDENCE
MECHANICAL PROPERTIES
POWER PLANTS
TEMPERATURE RANGE
TESTING
THERMAL POWER PLANTS
420205* - Engineering- Transport & Storage Facilities- (1980-)
200104 - Fossil-Fueled Power Plants- Components
420400 - Engineering- Heat Transfer & Fluid Flow