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Seismic Evaluation Method for Piping Systems With Local Wall Thinning Caused by LDI

[+] Author Affiliations
Michiya Sakai, Shinichi Matsuura

Central Research Institute of Electric Power Industry, Abiko, Chiba, Japan

Ryo Morita, Fumio Inada

Central Research Institute of Electric Power Industry, Komae, Tokyo, Japan

Shigenobu Onishi, Mitsuo Kugimoto

Chubu E.P., Nagoya, Aichi, Japan

Paper No. PVP2014-28851, pp. V008T08A034; 7 pages
doi:10.1115/PVP2014-28851
From:
  • ASME 2014 Pressure Vessels and Piping Conference
  • Volume 8: Seismic Engineering
  • Anaheim, California, USA, July 20–24, 2014
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-4607-0
  • Copyright © 2014 by ASME

abstract

The earthquake-proof safety of piping systems with local wall thinning due to liquid droplet impingement erosion (LDI) was evaluated using a hybrid experiment which has been incorporated a numerical analysis of the whole system with a static loading test of elbow pipe model. Seismic performance effects of wall thinned elbow were clarified by comparing three cases of different thickness elbow models such as no defect, 50% defect and 75% defect. No damage was observed for in-plane and out-of-plane bending of elbows in the 75% condition under a seismic load equal to five times the design basis earthquake required to reach allowable stress level. In addition, torsion buckling occurred and through wall crack penetrated by cyclic loading under eight times large amplitude the above mentioned seismic motion.

Copyright © 2014 by ASME

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