Ultrasonic Peening: a fatigue life improvement technique
Ultrasonic peening is a fatigue life improvement technique consisting of the cold working of weld toe and weld face. This treatment improves the fatigue strength of any full penetration weld configuration four times.
The selected weld connections for Ultrasonic Peening treatment are normally of structural integrity concern. Therefore the fatigue life extension of these specific welds will imply a general life extension of the offshore structure with maintained structural integrity. This surface metal treatment is currently used to avoid or prevent fatigue cracks in high stressed weld connections in offshore structures.
LETS Global performs the ultrasonic peening treatment in almost any offshore environment confined or not and with or without rope access.
Ultrasonic Peening used to avoid fatigue cracking
Ultrasonic Peening treatment can be used in any area where relatively high stresses are present. As a result of the ultrasonic peening treatment fatigue cracks will be avoided during the remaining service life of the installation. The treatment is so effective that it could extend the service life of any full penetration weld configuration by at least four times.
So if the treatment is carried out for example during a scheduled tank inspection it will be a easy way to prevent any fatigue crack to start of develop in areas normally of difficult access as cargo tanks. The treatment as it only concerns areas of high risk for fatigue cracks to develop, is relative quick so the work could be done in approximately the same time as it takes for the inspection work to be finished. In essence ultrasonic peening gives offshore operators a pro-active solution for fatigue related structural integrity challenges. By using ultrasonic peening the rig manager or the structural integrity engineer will be able to eliminate frequent shutdowns for structural repairs.
Ultrasonic Peening save time and money
This will save time, money and most important it will protect uptime. Normally the offshore ultrasonic peening team consist of two ultrasonic technicians, en NDT inspector and en QA & QC Engineer. Depending of the location to be treated and the accessibility this could change from case to case.We are active in the world’s biggest offshore sectors including the North-Sea, Gulf of Mexico and Brazil.
The LETS Global Ultrasonic Peening teams are able to perform the treatment at any location in any rig, anywhere in the world.