Coupling Bolt Failures

2009-01-26

Coupling Bolt Failures

~by Herbert Roeser & Dilip Kalyankar, Trans Marine Propulsion Systems, Inc. & Nils Juhlin NovaComp Engineering, Inc.

Synopsis

The importance of proper pre-loading of coupling bolts cannot be too strongly stated. Most coupling bolt problems relate to inadequate pre-loading of the bolts during installation, or relaxation of the bolt load in service due to rough or inaccurately machined coupling faces. This will eventually result in working of the coupling joint under the applied loads leading to fretting and seizing of the bolts and coupling faces which eventually will lead to fatigue failures of the coupling
bolts.

This paper looks into the effect of the dynamic response of the system on the bolt design with two examples from our own experience in this industry.

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