What is Water Tank Interior Coating and Why is it Important?

An image of the interior of a water tank. Text over the top says "water tank interior coating why is it important"

If you have a cold water tank at your facility you might be thinking about getting a water tank interior coating. But are you aware of all the benefits of installing a water tank lining? 

In this article we cover everything you should know about interior water tank lining and its importance. 

What is Water Tank Interior Coating? 

Water tank interior coating is a protective layer applied to the inner surface of water storage tanks. The primary purpose of those coatings is to provide a barrier between the tank’s interior and the stored water. Essentially, it protects the structural integrity of the tank to maintain the quality of stored water. 

There are different types of coatings available on the market, with the most popular ones including epoxy, polyurethane and cementitious coatings. Cementitious coatings are more commonly used on concrete water tank systems due to their ability to adhere well to this material. Epoxy coatings on the other hand provide excellent corrosion resistance. Polyurethane coatings are more advanced offering prolonged durability and flexibility. 

An effective tank lining system should have strong adhesive properties and have good resistance to chemicals, UV rays and other environmental factors. Additionally, coatings should comply with safety standards and be approved by governing bodies including WRAS and DWI. 

Why is Water Tank Lining and Coating Important? 

So what makes interior coatings so important for your water storage tank? As we have already established, tank lining serves as a barrier, but it does so much more than that. 

Protection Against Rust and Corrosion

Corrosion and rust are common issues with metal and steel water tanks. Tank lining prevents water from being in direct contact with the metal surface, thereby reducing the risk of corrosion. This is crucial for maintaining the structural integrity of your tank for longer. 

Corroded steel tank without coating.
Steel tank with interior coating.

Bacterial Growth Prevention

Due to their function water storage tanks are susceptible to bacterial growth which can compromise the quality of stored water. Legionella – a bacteria that causes Legionnaires’ disease, is a particularly common thread in stored water. A high-quality interior coating creates a smooth, non-porous surface that inhibits the growth of bacteria and algae. 

Prolonged Lifespan of Your Water Tank

By providing a protective layer, water tank lining can significantly increase the lifespan of your tank. Both corrosion and bacteria can contribute to the deterioration of your water tank, causing leaks, structural damage and the need for premature replacement. Interior coatings coatings are a cost-effective preventative measure, reducing maintenance costs and improving the overall longevity of your tank. 

Ensuring Better Water Quality

Water tank lining effectively prevents contaminants from entering your stored water, guaranteeing better water quality. A well-lined, maintained water tank can help safeguard your drinkable water and protect your industrial operations. 

How to Maintain Your Water Tank’s Interior Coating? 

Proper maintenance is essential to ensure the effectiveness of any interior coatings applied to your tank. Here are our best tips for maintaining your water tank’s interior coating:

Schedule Regular Inspections 

Regular inspections are essential for maintaining the condition of your water tank and its lining. The sooner you find and address deterioration, the lower the risk of further damage to your tank. Inspections should include a visual assessment of your water tank and any applied interior coatings.  

Arrange Touch-ups or Repairs if Needed

If there is minor damage to your tank, repairing it as promptly as possible will help prevent further deterioration. Depending on the scale of damage this can involve cleaning the tank and reapplying new coating to the affected area. 

Look for Signs that Reapplication Might be Necessary

Monitoring your tank for specific signs of wear or damage can help you determine when it’s time to reapply its coating. Some of the signs to look out for include:

  • Excessive peeling; 
  • Noticeable corrosion;
  • Decline in water quality. 

If you’re noticing any of these, it’s time to book a thorough assessment with a qualified professional. To ensure optimal performance and avoid health and safety issues, it’s essential to let a professional handle any needed water tank relining. 

Interior Water Tank Coating with COVAC

Do you want to protect your water tank from corrosion and bacteria? COVAC can help! 

As water tank lining specialists with over 25 years of experience, we offer first-class water tank lining service, using our high-performance solvent free polyurethane coating Acothane DW. If you have a water tank in need of repair we also offer cost-effective inspection and refurbishment services to maintain your tank in functional condition. 

All of our services are fully compliant with WRAS regulations and backed by a 10-year guarantee. Get in touch with the team today to find out how we can assist with your needs. 

  • Cert No. 22946

  • Cert No. 22946