P37 FPSO Fatigue Life Extension of Pallets Stools

Fatigue life extension has been achieved by ultrasonic peening in high stressed areas of pallet stool welds on the cargo deck of the P37 FPSO.
The treated brackets welds are located on cargo deck area and supports the steel work and liquids for required equipment.
Our fatigue life assessment is based on the documentation provided by ABS. The high stressed areas showed short fatigue lives on bracket welds.
By the application of ultrasonic peening treatment to these high stressed welds the expected fatigue life was extended five times, assuming current fatigue life assessment provided by ABS.