Why secondary containment matters when you store liquids, and how to size it.
Storing fuel or chemicals in cans is only half of safe storage. If a can leaks, secondary containment is what stops the spill becoming an incident. This is general guidance; confirm your local rules.
Secondary containment is a bund, tray or spill pallet that catches what a container releases if it leaks or is knocked over. The container is the primary; the bund is the backup. Many jurisdictions require it for stored fuel and chemicals above a threshold volume.
A common rule is that a bund holds at least 110 percent of the largest single container, or a set percentage of the total stored volume, whichever is greater. The extra allowance covers rainfall on an outdoor bund and the displacement of other containers. Check the exact figure your regulator uses.
The bund has to resist what it might catch. A steel bund suits fuel; a chemical needs a bund lined or built in a compatible material, the same compatibility question as the container itself. See our compatibility guide.
Keep an absorbent spill kit rated for the liquid near the store, label containers by contents and date, and inspect for leaks and corrosion on a schedule. Good housekeeping catches a weeping can before it empties.
A sound, well-sealed container is the first line: a UN-coded can with an intact closure rarely reaches the bund. Read storing fuel safely.
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