Equinor investigating welding defects on Castberg FPSO hull April 19, 2021, by Nermina Kulovic An in-house investigation team from Norway’s Equinor has studied the deviation in quality of welding and inspection of the Johan Castberg production vessel currently under construction at the Sembcorp Marine yard in Singapore. During the construction of the hull for the Johan Castberg production vessel at Sembcorp Marine in Singapore, Equinor has revealed quality deviations regarding both welding and welding inspection. In September 2020, Norwegian offshore safety watchdog, the Petroleum Safety Authority Norway (PSA), launched an investigation into challenges related to the completion of the hull and equipment for Equinor’s Johan Castberg FPSO.