The design level of seismic safety to be provided to a pipeline depends on the importance of
the pipeline and the consequence of its failure. The importance can be accounted in two ways
(1) Design the pipeline for higher seismic hazard, which is corresponding to higher return period.
Table 1.5 gives the design basis earthquake fro different types of pipes; and
(2) Design the pipeline for the hazards corresponding to design basis earthquake and multiplied by
an importance factor Ip;
In this procedure presented, the second approach is adopted.