Secondary Containment (Bunding)
Secondary containment or bunded areas require a seamless, waterproof lining to prevent contamination of liquids into the surrounding environment. Also known as a form of ‘spill control’, bunded areas are recommended to protect the surrounding environment from contaminants such as fuel, oil, chemicals or liquid waste.
Epoxy type products have traditionally been used for coating bunded areas due to their high adhesion to concrete and chemical resistance. However, epoxies have a major disadvantage when used as a bunded area or secondary containment liners — they have no elongation and over time won’t bridge hairline cracks in concrete or stretch to accommodate the cyclical daily expansion and contraction of large sections of substrate. Other types of membranes such as acrylics and bituminous membranes have also been used as bund walls, but they lack UV resistance and over time become brittle and crack.
Tufflon-P90 is a new generation of polyurea bund wall coating material with all the benefits of epoxies — high adhesion to the substrate and excellent resistance to chemicals and hydrocarbons — but with the extra advantage of being highly and permanently elastomeric. With elongation greater than 400% and excellent puncture resistance, the membrane moves with cyclical changes in the concrete substrate and won’t crack or peel.
Secondary Containment System Requirements
The Environmental Protection Agency (EPA) suggests that all chemical containment areas (or bunds) must be large enough to hold at least 110% of the contents of a tank. Any contained liquid other than rainwater should have a bunded area to prevent contamination into the environment. These applications are found in mining, civil, construction and commercial industries and require highly elastomeric secondary containment liners, like Tufflon® and Elaston® products. Features of LiquiMix bund wall and secondary containment system products include:
- Chemical resistant
- Permanently elastomeric
- Quick to apply — fast return to service
- Won’t flake, peel, crack or blister
- Smooth and seamless easy-clean finish
For further information about our extensive range of Tufflon® and Elaston® products and their suitability as bund wall and secondary containment liners, contact LiquiMix.
An excerpt from the Gladstone City Council in Queensland gives the following suggestions regarding bunding requirements:
"A bund is an embankment or wall of brick, stone, concrete or other impervious material, which may form part or the entire perimeter of a compound and provides a barrier to retain liquid. Since the bund is the main part of a spill containment system, the whole system (or bunded area) is colloquially referred to within the industry as the ‘bund’. The bund is designed to contain spillages and leak from liquids used, stored or processed above ground, and to facilitate clean up operations. As well as being used to prevent pollution of the receiving environment, bunds are also used for fire protection, product recovery and process isolation."
Chemical resistant - see chart
Quick to apply - fast return to service
Will not flake, peel, crack or blister
Smooth and seamless easy-clean finish
Bunded Areas (Secondary Containment)
Sewerage Treatment Plants
Wastewater Treatment Plants
Chlorine or cleaning agent bunds
Mining chemical containment areas