This paper addresses the application of the design by analysis rules of the ASME B&PV Code SEC III Division 1 NB-3200 criteria on degraded Class 1 piping. A tight radius pipe bend with a local thin area (LTA) located on the inner surface and super imposed on general thinning region is considered using a detailed FEA model implementing idealized smooth axial and circumferential thickness profiles. A location dependent thinning rate function is developed (based on the smoothed profiles and the assumed original thickness distribution) to predict the wall thickness distribution at the end of an arbitrary evaluation period. Internal pressure and dead weight loads are statically applied. Linear elastic analysis is performed and the results are checked against the ASME Code criteria for the primary stress intensity. It is demonstrated that a “local” wall thickness considerably below the pressure based thickness for the corresponding straight pipe segment meets the requirements of the ASME Code SEC III for the primary stresses. The effect of the extent of the local thin area in the axial direction is explored. This paper also compares the allowable pressure obtained from elastic analysis of NB-3221 and limit analysis of NB-3228.1.
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ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference
July 18–22, 2010
Bellevue, Washington, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-4922-4
PROCEEDINGS PAPER
ASME Code Qualification of Pipe Bends With Localized Wall Thinning
Usama Abdelsalam,
Usama Abdelsalam
AMEC NSS Limited - Power & Process Americas, Toronto, ON, Canada
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Dk Vijay
Dk Vijay
AMEC NSS Limited - Power & Process Americas, Toronto, ON, Canada
Search for other works by this author on:
Usama Abdelsalam
AMEC NSS Limited - Power & Process Americas, Toronto, ON, Canada
Dk Vijay
AMEC NSS Limited - Power & Process Americas, Toronto, ON, Canada
Paper No:
PVP2010-25178, pp. 213-220; 8 pages
Published Online:
January 10, 2011
Citation
Abdelsalam, U, & Vijay, D. "ASME Code Qualification of Pipe Bends With Localized Wall Thinning." Proceedings of the ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASME 2010 Pressure Vessels and Piping Conference: Volume 3. Bellevue, Washington, USA. July 18–22, 2010. pp. 213-220. ASME. https://doi.org/10.1115/PVP2010-25178
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