Understanding What Bund Lining Is:
Bund, also referred to as a secondary containment has one main function, to store 110 percent of the liquid in case the primary containment fails. Bunds are typically constructed of brick, concrete or metal depending on the corrosion resistance and corrosivity of the chemical stored in the primary containment or storage tank. The majority of chemicals can be harmful to the environment if they leak; hence, the use of bund linings are essential.
Bunds made of steel suffer corrosion problems caused by water while brickwork and concrete are porous. Installing a polymer-based lining like Polyurea lining has been proven to be the most effective alternative. Thus ensuring secondary containment can hold the liquid inside the event of the primary containment in the event of a failure.
What are the benefits of bund lining?
- Polyurea linings offer fantastic structural integrity
- A life expectancy of more than 25 years
- Straightforward to clean
- Aesthetically appealing
Our polyurea coating material can be applied to all types and sizes of bunds. They also benefit from being applied all year round, even in sub-zero temperatures.
Our team of specialist lining applicators will provide you with excellent service. Our linings have excellent chemical resistance and can tolerate temperatures of up to 240 degrees!
Case Study: Plant Room Bund Lining
Dirty water from the leaking plant and equipment is leaking through the slab and penetrating clinical areas below.
Construct several bunds to contain the leaks and apply a seamless, flexible bund lining/waterproofing system. The polyurea lining will prevent a hygiene risk as well as prevent additional cleaning/decontamination costs.
Preparing for the Bund Lining
All surfaces must be prepared by vacuum-controlled diamond grinding to remove poorly adhered existing coatings to ensure perfect adhesion of the bund lining.
Building the Bund
Once prepared, bund walls are constructed using concrete blocks bonded to the slab utilizing a high-strength mortar. The same mortar is used to create a fillet detail at the floor/wall intersection to isolate this potential movement point from the new bund lining.
Applying the Bund Lining
Any cracks in the slab are first sealed using ArmorFloor™, a two component, aliphatic polyaspartic compound before isolating from the new bund linings using bond breaker tape. These areas are then reinforced locally using a chopped stand mat incorporated into the primer.
To ensure a seamless and pinhole-free bund lining, the new bund walls receive a cementitious grout coat to remove the profile from the concrete blocks.
The bunds are then primed using a damp tolerant primer to ensure excellent adhesion of the new bund lining/tanking system. This is reinforced over the cracks using chopped strand matt for additional strength.
Finally, two coats of ArmorLiner polyurea coating are applied throughout to a thickness of 1mm to create a seamless and flexible lining.
Finally, as a safety measure, the tops of the walls are marked in safety yellow to highlight the trip hazard of the bund walls.