Identify future structural issues, prevent them to happen and reduce their frequency of occurrence.
Identify Structural Issues
The first and most important task of a Life Extension Program is to identify upcoming structural issues. These could be high stresses at brackets side welds on cargo deck.
Prevent fatigue cracking
High stresses will inevitable at certain point during the service life of the installation induce fatigue cracking. If these areas are of structural integrity concern weld repair would be necessary. It is therefore advisable to prevent these fatigue cracks to develop.
Ultrasonic peening to prevent fatigue cracking
The areas identified as having high stresses and therefore prone to fatigue cracking would need to be ultrasonic peening treated in order to increase the fatigue crack resistance.
Preventing fatigue cracking and maintain structural integrity
The element prone to fatigue cracking is located on cargo deck and therefore a fatigue cracking would have structural integrity consequences.
Ultrasonic peening will extend the fatigue life of the treated weld four times
This fatigue life extension of an specific weld connection will contribute towards the structural integrity of the installation. If all the fatigue sensitive areas are improved the entire structure will benefit of an extend service life.
Reduce the frequency of occurrence of structural issues
A Life Extension Program will allow for an extended service life of the installation. As a result the number of load cycles applied on a specific weld connection will increase and therefore the fatigue cracking will always be an issue which needs to be taken into account. With increased fatigue crack resistance due to the ultrasonic peening treatment the risk for fatigue cracking will be minimized and by that the frequency of occurrence of these.