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Bunding
Bunding – Secondary containment systems.
Bunds are generally used around storage tanks or drum storage areas where flammable or toxic liquids are held. Alternative measures may be earth dikes (usually for very large tanks), sumps and interceptors. Bunds are also sometimes used within plant buildings for reactors and other process vessels. For materials that are normally gases at ambient conditions, bunds are used where flash fractions are sufficiently low to merit them. Therefore they are often used for refrigerated gases but not for the same gases stored under pressure.
It is normal to limit the number of tanks in a single bund to 60,000 m3 total capacity. However, incompatible materials should have separate bunds. Tanks often have individual bunds.
Further reading from the Health and Safety Executive say