Qualification of diesel generator exhaust carbon steel piping to intermitted elevated temperatures

Journal Article · Thu Feb 01 04:00:00 EST 1996 · Journal of Pressure Vessel Technology

DOI:https://doi.org/10.1115/1.2842161· OSTI ID:197586

Ratiu, M D; Moisidis, N T ^[1]

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1. CALCET Co., San Leandro, CA (United States). Nuclear Div.

The diesel generator exhaust piping, usually made up of carbon steel piping (e.g., ASME SA-106, SA-53), is subjected to successive short time exposures at elevated temperatures up to 1,000 F (538 C). A typical design of this piping, without consideration for creep-fatigue cumulative damage, is at least incomplete, if not inappropriate. Also, a design for creep-fatigue, usually employed for long-term exposure to elevated temperatures, would be too conservative and will impose replacement of the carbon steel piping with heat-resistant CrMo alloy piping. The existing ASME standard procedures do not explicitly provide acceptance criteria for the design qualification to withstand these intermittent exposures to elevated temperatures. The serviceability qualification proposed is based on the evaluation of equivalent full temperature cycles which are presumed/expected to be experienced by the exhaust piping during the design operating life of the diesel engine. The proposed serviceability analysis consists of: (a) determination of the permissible stress at elevated temperatures, and (b) estimation of creep-fatigue damage for the total expected cycles of elevated temperature exposures following the procedure provided in ASME Code Cases N-253-6 and N-47-28.

• Sponsoring Organization: USDOE
• OSTI ID: 197586
• Journal Information: Journal of Pressure Vessel Technology, Journal Name: Journal of Pressure Vessel Technology Journal Issue: 1 Vol. 118; ISSN JPVTAS; ISSN 0094-9930
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
36 MATERIALS SCIENCE
CARBON STEELS
CREEP
DIESEL ENGINES
ELECTRIC GENERATORS
ENGINEERED SAFETY SYSTEMS
EXHAUST SYSTEMS
MECHANICAL PROPERTIES
NUCLEAR POWER PLANTS
PIPES
STANDARDS
THERMAL FATIGUE