Effects of alternative inspection strategies on piping reliability

M. A. Khaleel, F. A. Simonen

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

This paper applies probabilistic fracture mechanics calculations to determine the effects of inspection on leak probabilities for piping. The approach has been to perform calculations in a structured parametric format, with the parameters selected to cover the range of pipe sizes, degradation mechanisms, operating stresses, and materials relevant to the piping systems of interest. In this paper, the calculations were intended to be generally applicable to mechanical and thermal fatigue of stainless steel piping. Specific areas of uncertainty addressed by the probabilistic calculations of this paper are the numbers of initial flaws, the distributions of flaw sizes, the crack growth rates for these initial flaws, and the probability of detection curves and inspection schedules that describe inservice inspections which are performed to detect these growing flaws. The effectiveness of an inspection strategy is quantified by the parameter `Factor of Improvement', which is the relative increase in piping reliability due to a given inspection strategy as compared with the strategy of performing no inspection. The results of a systematic set of calculations are presented in this paper that address inspection effectiveness for operating stresses giving crack growth rates ranging from very low to very high. Inspection strategies are described that address three reference levels of ultrasonic inspection reliability, intervals between inspections ranging from 1 to 10 years, and both preservice and inservice inspections.

Original languageEnglish
Pages (from-to)115-140
Number of pages26
JournalNuclear Engineering and Design
Volume197
Issue number1
DOIs
Publication statusPublished - 2 Apr 2000
Externally publishedYes

Fingerprint

piping
inspection
Inspection
Defects
defects
Crack propagation
crack
effect
cracks
thermal fatigue
Thermal fatigue
fracture mechanics
Piping systems
Stainless Steel
schedules
fatigue
Fracture mechanics
format
stainless steels
Stainless steel

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Nuclear Energy and Engineering
  • Civil and Structural Engineering
  • Mechanical Engineering
  • Safety, Risk, Reliability and Quality

Cite this

Effects of alternative inspection strategies on piping reliability. / Khaleel, M. A.; Simonen, F. A.

In: Nuclear Engineering and Design, Vol. 197, No. 1, 02.04.2000, p. 115-140.

Research output: Contribution to journalArticle

Khaleel, M. A. ; Simonen, F. A. / Effects of alternative inspection strategies on piping reliability. In: Nuclear Engineering and Design. 2000 ; Vol. 197, No. 1. pp. 115-140.
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