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 1000° 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.

Issue Section:
Research Papers
Topics:
Carbon steel, Diesel generators, Exhaust systems, Pipes, Temperature, Design, Creep, Fatigue, ASME Standards, Damage, Maintainability, Cycles, Acceptance criteria, Alloys, Diesel engines, Heat, Service life (Equipment), Stress
1.
ASME Boiler and Pressure Vessel Code, Section III, 1989 Edition through 1992 Addenda.
2.
ASME Boiler and Pressure Vessel Code, Section VIII, 1989 Edition through 1992 Addenda.
3.
ASME Code for Pressure Piping, Section B31.3, 1990 Edition, “Chemical Plant and Petroleum Refinery Piping.”
4.
ASME Boiler and Pressure Vessel Code Case N-253-6 “Construction of Class 2 or Class 3 Components for Elevated Temperature Service.”
5.
ASME Boiler and Pressure Vessel Code Case N-47-28 “Class 1 Components in Elevated Temperature Service.”
6.
ASTM E139-83 “Conducting Creep, Creep-Rupture, and Stress Rupture Tests of Metallic Materials.”
7.
Booker, M. K., and Booker, B. L. P., 1983, “Analysis of Elevated Temperature Tensile and Creep Properties of Wrought Carbon Steels,” Proceedings of the 4th National Congress on Pressure Vessels and Piping Technology, Portland, OR, ASME, New York, NY.
8.
Conway, J. B., 1985, “Creep-Fatigue Interaction,” Metals Handbook, Vol. 8, 9th Edition, ASM, Metals Park, Ohio, pp. 346–360.
9.
Dhalla, A. K., 1987, “A Simplified Procedure to Classify Stresses for Elevated Temperature Service,” Pressure Vessels and Piping Conference, Vol. 120, pp. 177–188.
10.
IIW Guidance, 1990, “Assessment-Fitness for Purpose of Welded Structures,” International Institute of Welding, Document IIW/IIS-SST-1157-90, Cambridge, U.K.
11.
Manson, S. S., 1982, “A Critical Review of Predictive Methods for Treatment of Time-Dependent Metal Fatigue at High Temperatures,” Pressure Vessels and Piping Design Technology—A Decade of Progress, ASME.
12.
Metals Handbook 1990, “Properties and Selection: Irons, Steels, and High-Performance Alloys,” Vol. 1, 10th Edition, ASM International, Materials Park, OH.
13.
Ratiu, M. D., Hau, G., Chao, S., 1990, “Alternate Procedure for Evaluation of Non-Linear Stress and Strain for Thermal Expansion Loading,” Pressure Vessels and Piping Conference, Nashville, TN, Vol. 197, pp. 307–310.
14.
Ratiu
M. D.
, and
Moisidis
N. T.
,
1993
, “
Serviceability of Carbon Steel Piping to Intermittent Elevated Temperatures
,” Pressure Vessels and Piping Conference, Denver, CO,
ASME PVP
-Vol.
265
, pp.
49
–
58
.
15.
Viswanathan, R., 1989, “Damage Mechanisms and Life Assessment of High Temperature Components,” ASM International, Metals Park, OH.
This content is only available via PDF.
Copyright © 1996
 by The American Society of Mechanical Engineers
You do not currently have access to this content.