Journal of Pressure Vessel Technology

Volume: Page/CID:

Target Reliability Levels for Design and Assessment of Onshore Natural Gas Pipelines
This paper proposes a set of reliability targets that can be used in the design and assessment of onshore natural gas pipelines. The targets were developed as part of a PRCI-sponsored project that aim...

Weight Minimization of Natural Gas Distribution Riser Systems
This study investigates the optimal piping layout in the installation of residential natural gas riser piping systems subjected to daily temperature fluctuations. Specifically, it is desired to evalua...

J. Pressure Vessel Technol. / Volume 131 / Issue 6 / Technical Briefs

Evaluation on an Internal Surface Crack in a Compound Tube

J. Pressure Vessel Technol. -- December 2009 -- Volume 131, Issue 6, 064501 (4 pages)
doi:10.1115/1.4000346

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ABSTRACT

REFERENCES (9)

Author(s):
A. A. Ali, J. Purbolaksono, A. Khinani, A. Z. Rashid, and F. Tarlochan
Department of Mechanical Engineering, Universiti Tenaga Nasional, Km 7 Jalan Kajang-Puchong, 43009 Kajang Selangor, Malaysia

Inthis paper stress intensity factors of a longitudinal semielliptical surfacecrack on the inner surface in a compound tube subjectedto internal pressure are presented. Variations of modulus of elasticityand thickness for the inner part of the tube areused in order to evaluate their effects on the normalizedstress intensity factors. The boundary element method is used toanalyze the problems. The increasing of thickness of the innerregion causes decreasing values of the normalized stress intensity factor,as the modulus of elasticity for the inner part isgreater than that of the outer part. Conversely, if themodulus of elasticity for the inner region is smaller, theincreasing of thickness of the inner part would give increasingvalues of the normalized stress intensity factor. A larger innerradius and smaller thickness of the tube gives a highernormalized stress intensity factor.