DWI Approved Coatings
DWI (Drinking Water Inspectorate) approved coatings are coatings that have been specifically designed to protect water storage tanks and reservoirs from chemical contamination. These coatings are specifically formulated to ensure that they do not affect the quality of drinking water, and are therefore subject to strict guidelines and regulations set out by the DWI.
What is the DWI?
The DWI is an independent body that oversees the quality of drinking water in England and Wales. It sets out strict regulations for the materials used in water storage tanks and reservoirs to ensure that they do not contaminate the water supply. One of the key materials that are subject to these regulations is the coating used to protect the inside of the tanks.
What is a DWI approved coating?
DWI approved coatings are designed to provide a high level of protection against chemical contamination, while also being resistant to the effects of water and weathering. These coatings are typically made from a range of materials, including epoxy, polyurethane, and vinyl ester.
DWI approved coatings are subject to strict guidelines and regulations set out by the DWI. These guidelines cover a range of factors, including the type of coating used, the application process, and the testing and inspection of the finished coating. Coatings must be tested and approved by the DWI before they can be used in water storage tanks and reservoirs.
One of the key factors that the DWI considers when approving coatings for use in water storage tanks and reservoirs is their impact on water quality. Coatings must be formulated to ensure that they do not affect the taste, odor, or color of the drinking water. They must also be able to withstand the effects of chlorine and other disinfectants used in the water treatment process.
Another important factor that the DWI considers when approving coatings is their resistance to cracking, peeling, and other forms of damage. Coatings must be able to withstand the effects of weathering, as well as the expansion and contraction that occurs as the water temperature changes. They must also be able to resist damage from abrasion and impact.
What kind of DWI coatings are available?
Epoxy coatings are widely used in the water storage industry due to their high level of chemical resistance and durability. These coatings are typically applied in two layers, with a primer layer applied first to ensure good adhesion, followed by a topcoat to provide additional protection. Epoxy coatings are resistant to a wide range of chemicals, including chlorine, which is commonly used to disinfect drinking water.
Polyurethane coatings are another popular option for water storage tanks and reservoirs. These coatings are typically applied in a single layer and provide excellent chemical resistance and durability. Polyurethane coatings are particularly useful in environments where the water supply is subject to changes in temperature or pressure, as they are able to flex and move with the substrate without cracking or peeling.
For expert advice on the best coating for your asset, contact us.
DWI approved coatings are an essential component of the water storage industry. They play a critical role in ensuring the safety and quality of drinking water, protecting it from chemical contamination and other forms of damage. By choosing a DWI approved coating, water storage companies can be confident that they are using a product that has been rigorously tested and approved for use in the most demanding environments.
We have a wide range of solutions for DWI (and non-DWI) applications for your project.