Secondary containment

Some recommended methods for secondary containment are shown below;

The secondary containment must meet applicable local legal requirements based on chemical volume and container sizes. However, it is recommended that the volume of the secondary containment should be 110% of the primary container. 

In case of multiple containers stored together, the volume of the largest container should be taken into account, irrespective of whether the container is full or partially filled, and the secondary containment volume of 110% of this largest container should be provided.

As shown in the below figure, if two containers with volumes 20L each and two containers with volume 120L each are stored with one 300L volume container, then the secondary containment capacity for this storage cluster should be calculated as:

330L (=110% of the largest volume container)

Irrespective of whether the 300L container is partially filled at the time of storage.