To help keep containment tanks from leaking or sewage and wastewater lagoons from seeping hazardous materials into the groundwater supply, liners cover the entire surface of the tank or pond. Since they can affect what happens to the environment, the tank liners must be compliant with the rules set forth by the Environment Protection Agency or a company could face serious fines.
The material used for making tank liners will depend on what substance the tank holds. If it is a chemical, the liner needs not to react to the chemical so it can keep safely storing that chemical. Depending on their purpose, liner companies may make their liners from heavy plastic materials or spray-on membranes to form a coating to make the liner leak proof.
The materials most often used to make pond or tank liners include:
- XR5 – A very strong geomembrane that is highly resistance to chemicals and UV light.
- HDPE – High-density polythelene is a petroleum product. It has various uses, including the manufacture of geomembrane.
- LLDPE – Linear-low density polythylene is a plastic and often lines ponds because it has good water properties.
- Polypropylene – A flexible plastic good for use as above ground liners for wastewater or sewage lagoons.
Installing Pond or Tank Liners
Adding a tank or pond liner, or spraying on tank liner coatings, usually takes place in the field. While a tank assembly can take place onsite by the company’s workers, there are rules about adding a lining to a tank. A technician who is trained to install pond or tank liners will need to perform the task. They will use their expertise to fit the lining to the sides of the tank and weld it in place.
To insure the liner will hold, a vacuum test or mechanical peel test is done to test the lining. Some liners will need to be physically put into place, while others form an airtight seal against a tank’s sides when using a liner coating. A spray liner coating uses various polymers to form a seamless seal.
Tank liners are a low-cost way to protect the environment in case a tank, a secondary container or other type of storage system fails and forms leaks. However, with a liner in place, there will be no leakage from the tank it is protecting. The chemicals or other harmful substances in the tanks will not be able to harm the environment with the use of a seamless tank liner.
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