BS EN 1998-4:2006 specifies principles and application rules for the seismic design of the structural aspects of facilities composed of above-ground and buried pipeline systems and of storage tanks of different types and uses, as well as for independent items, such as single water towers serving a specific purpose, or groups of silos enclosing granular materials, etc.
BS EN 1998-4:2006 includes the additional criteria and rules required for the seismic design of these structures without restrictions on their size, structural types and other functional characteristics. For some types of tanks and silos, it also provides detailed methods of assessment and verification rules.
This standard replaces DD ENV 1998-4:1999.