Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

A New Approach to Finding a Risk-Informed Safety Factor for “Fail-Safe” Pressure Vessel and Piping Design

Published

Author(s)

Jeffrey T. Fong, Nathanael A. Heckert, James J. Filliben, Pedro V. Marcal, Stephen W. Freiman

Abstract

The purpose of this paper is to present a new approach to finding a risk-informed safety factor for the "fail-safe" design of a high-consequence engineering system. The new approach is based on the assumption of a 99.99 % confidence level and a 99.99 % coverage, and the application of the classical theory of tolerance limits, error propagation, and a method of statistical model parameter estimation known as the bootstrap method. To illustrate this new approach, we first apply the methodology to the UTS data of six materials ranging from glass, ceramics, to a high-strength steel at both 20 C and 600 C, and then to the fatigue life estimation of a BK-7 glass using two available additional sets of laboratory test data. Significance and limitations of our new approach to the "fail-safe" UTS design and fatigue life prediction of an aging PVP or aircraft are presented and discussed.
Proceedings Title
Proceedings of 4th International Symposium on Structural Integrity (ISSI), Lanzhou, China, Aug. 20-24, 2014.
Conference Dates
August 20-24, 2014
Conference Location
Lanzhou

Keywords

Aging structures, bootstrap method, error propagation, fail-safe design, fatigue life model, pressure vessel and piping, safety factor, tolerance limit theory, ultimate tensile strength. aging structures, bootstrap method, error propagation, fail-safe design, fatigue life model, pressure vessel and piping, safety factor, tolerance limit theory, ultimate tensile strength. aging structures, bootstrap method, error propagation, fail-safe design, fatigue life model, pressure vessel and piping, safety factor, tolerance limit theory, ultimate tensile strength.

Citation

Fong, J. , Heckert, N. , Filliben, J. , Marcal, P. and Freiman, S. (2014), A New Approach to Finding a Risk-Informed Safety Factor for “Fail-Safe” Pressure Vessel and Piping Design, Proceedings of 4th International Symposium on Structural Integrity (ISSI), Lanzhou, China, Aug. 20-24, 2014., Lanzhou, -1 (Accessed June 17, 2024)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created August 24, 2014, Updated February 19, 2017