BG Trinidad and Tobago has undertaken a programme of modifications and upgrades over a number of years to its Dolphin Platform.  One such upgrade saw the installation of a new blast wall, further segregating hazardous areas on the installation.  As is often the case with brownfield modifications, a number of key constraints affected the design of the new blast wall, including weight and the desire to limit forces imparted by the new wall on existing topsides structures.