Computer modelling of the Asgard B, which is a semi-submersible steel floater, has been carried out in order to examine the possibility of supplying the flat bottom of the hull with “remote” cathodic protection by anodes located elsewhere than the flat bottom. Due to operational limitations, no anodes could be mounted on the flat bottom of the hull. The results show that even if traditional design codes are followed there is no guarantee to achieve a satisfactory corrosion protection situation for a structure during its entire planned service lifetime if large areas for some reason are not available for anode installation.