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Title: Thermal transients and creep effects on theoretical and experimental assessment in operating high temperature steam piping

Abstract

Transient, creep and relaxation studies of operating high pressure piping in AISI 316 have been developed by the Italian Electrical Board in view of reassessing the structural and mechanical integrity of the line. The influence of the prestressing on the pipe is examined to determine the modifications on stress and strain response in time. Sectional analysis with 3D finite element computer programme, assuming elastic and elastic-plastic deformation of the material, shows the congruence of theoretical approach with the experimental data; also, local strain gauge monitoring of some sections offers a good tool for validating theoretical computations which are in acceptable agreement with the quantities recorded. Many creep-relaxation cycles are introduced to simulate the effect of further long-term exposure to the piping in creep range, up to 50,000 hours, and to understand the cold spring effect on piping stress. The examination of cycles in creep regime allows to describe the behaviour of time dependent stress redistribution along the line, and gives some estimation about the safety margin existing in the structure.

Authors:
; ;
Publication Date:
Research Org.:
CNEN-DRV, Bologna
OSTI Identifier:
5611036
Report Number(s):
CONF-820601-
Journal ID: CODEN: AMPPD
Resource Type:
Conference
Journal Name:
Am. Soc. Mech. Eng., Pressure Vessels Piping Div., (Tech. Rep.) PVP; (United States)
Additional Journal Information:
Journal Volume: PVP-VOL. 66; Conference: ASME pressure vessel and piping conference, Orlando, FL, USA, 27 Jun 1982
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; PIPES; CREEP; THERMODYNAMICS; STAINLESS STEEL-316; COMPUTER CALCULATIONS; DEFORMATION; ELASTICITY; HIGH PRESSURE; HIGH TEMPERATURE; PLASTICITY; PROGRAMMING; RELAXATION; SAFETY; STEAM; STRAIN GAGES; STRESSES; TIME DEPENDENCE; TRANSIENTS; ALLOYS; CHROMIUM ALLOYS; CHROMIUM STEELS; CHROMIUM-NICKEL STEELS; CORROSION RESISTANT ALLOYS; HEAT RESISTANT MATERIALS; HEAT RESISTING ALLOYS; IRON ALLOYS; IRON BASE ALLOYS; MATERIALS; MEASURING INSTRUMENTS; MECHANICAL PROPERTIES; MOLYBDENUM ALLOYS; NICKEL ALLOYS; STAINLESS STEELS; STEELS; TENSILE PROPERTIES; 420500* - Engineering- Materials Testing

Citation Formats

Cesari, F, Menghini, S, and Regis, V. Thermal transients and creep effects on theoretical and experimental assessment in operating high temperature steam piping. United States: N. p., 1982. Web.
Cesari, F, Menghini, S, & Regis, V. Thermal transients and creep effects on theoretical and experimental assessment in operating high temperature steam piping. United States.
Cesari, F, Menghini, S, and Regis, V. 1982. "Thermal transients and creep effects on theoretical and experimental assessment in operating high temperature steam piping". United States.
@article{osti_5611036,
title = {Thermal transients and creep effects on theoretical and experimental assessment in operating high temperature steam piping},
author = {Cesari, F and Menghini, S and Regis, V},
abstractNote = {Transient, creep and relaxation studies of operating high pressure piping in AISI 316 have been developed by the Italian Electrical Board in view of reassessing the structural and mechanical integrity of the line. The influence of the prestressing on the pipe is examined to determine the modifications on stress and strain response in time. Sectional analysis with 3D finite element computer programme, assuming elastic and elastic-plastic deformation of the material, shows the congruence of theoretical approach with the experimental data; also, local strain gauge monitoring of some sections offers a good tool for validating theoretical computations which are in acceptable agreement with the quantities recorded. Many creep-relaxation cycles are introduced to simulate the effect of further long-term exposure to the piping in creep range, up to 50,000 hours, and to understand the cold spring effect on piping stress. The examination of cycles in creep regime allows to describe the behaviour of time dependent stress redistribution along the line, and gives some estimation about the safety margin existing in the structure.},
doi = {},
url = {https://www.osti.gov/biblio/5611036}, journal = {Am. Soc. Mech. Eng., Pressure Vessels Piping Div., (Tech. Rep.) PVP; (United States)},
number = ,
volume = PVP-VOL. 66,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1982},
month = {Fri Jan 01 00:00:00 EST 1982}
}

Conference:
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