Fracture Analysis of a Bolted Joint of a Large Pump Frame of a Desalination Plant

  • Luigi Carassale
  • Cesare Mario Rizzo


The present paper deals with the fracture analysis of the frame of a very large pump. The complex geometry of the structure as well as the loading conditions were responsible of premature fracture failures localized in the neighborhood of the bolted connection between the column pipe and the basement plate.

Retrofitting solutions and appropriate countermeasures were proposed after long lasting hydrodynamic and structural analyses that needed to account for very strict operational and time constraints.

The fracture strength as well as the vibration behavior of the structure were considered taking advantage of both numerical FE calculations and experimental in-situ measurements. The parallel numerical and experimental analyses leaded to a set of modifications of the structure hereunder described in detail.

The integration among experimental and theoretical results concurred to obtain a suitable solution for a quite complex case study because it allowed improving aspects related to both the strength and the loading conditions of the structure.


Pump Fatigue Fracture Vibration Finite elements Measurements 


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  1. 1.
    Hobbacher A. et al. (1996), Recommendations for Fatigue Design of Welded Joints and Components, International Institute of Welding (IIW), doc. XIII-1539-96/XV-845-96, Paris, France, July 1996.Google Scholar
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    Niemi E., Fricke W. and Maddox S.J. (2004), Structural hot-spot stress approach to fatigue analysis of welded components — Designer’s guide, International Institute of Welding (IIW), doc. XIII-1819-00/XV-1090-01, Paris, France, May 2004.Google Scholar

Copyright information

© Springer Science+Business Media B.V 2009

Authors and Affiliations

  1. 1.Department of Civil Environmental and Architectural EngineeringUniversity of GenovaGenovaItaly
  2. 2.Department of Naval Architecture and Marine EngineeringUniversity of GenovaGenovaItaly

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