Buildings and worksites utilise many types of water tanks, but these tanks can have issues. If you notice new stains, leaks, or rust, there might be a problem. Ignoring it can lead to contamination, water damage, and business disruptions.
The good news is you don’t always need to replace failing tanks, which is costly and only necessary in severe cases. Relining the tank is often a suitable solution. It involves adding a new, durable polyurethane lining inside the tank to extend its lifespan.
What is Tank Relining?
If you have water tanks in your buildings or processes and notice leaks, stains, or corrosion, it’s time to investigate. This can prevent further damage, water issues, microbial contamination, and business disruptions.
Replacing failing tanks is costly and should be a last resort. Instead, consider repairing or relining your tank. This involves applying a new, durable internal lining with a high-performance polyurethane coating that will last for many years.
How can Damaged Water Tanks Potentiate Risk?
If a tank starts to fail, it can corrode, and seals and joints might break. Tiny cracks and pits on the surface can become breeding grounds for bacteria like Legionella and Pseudomonas. These build-ups are dangerous and can affect water quality and safety.
One sign of tank problems is irregularities in water monitoring results. A water quality monitoring device could help detect faults. You might see warnings about Legionella, and bacterial levels may increase. Staining and sediment might appear at the bottom of the tank, externally along the joints or small pools start to form on the floor.
Look out for subtle damage signs. Corrosion on steel or metal parts can occur, and a slimy biofilm might form inside the tank. These indicators suggest it’s time for a service and possibly a tank reline.
Act promptly with tank issues. Relining is better than replacement, but only if damage is limited. If damage is severe, Comfort Services Group can guide you through replacement options and execute the best solution.
10 Benefits of Water Tank Relining
1. Cost-Effective Repair Method
Relining is cheaper than replacing the tank. Replacing requires buying a new tank, removing the old one, and installing the new one.
2. Enhances Water Safety
Tank relining helps ensure the water you store is safe. A new lining prevents contamination from bacteria. This keeps the water clean and safe for use.
3. Time Efficient
Tank relining is a faster solution than replacement. The process can be completed without removing the tank, minimising downtime. This means you can keep your operations running smoothly.
4. Adaptability
Our tank lining method is suitable for cold water storage tanks and other fluid containers, including oil and alcohol tanks, fire sprinkler systems, cooling towers, and interceptors.
5. Faster and More Secure
Relining tanks is quicker and safer than replacing them. Our skilled team completes the job fast and safely, minimising disruption to your business.
6. Resistance to Chemicals and Corrosion
Our polyurethane relining method can make your tank more resistant than before. It offers long-lasting protection against chemicals and corrosion.
7. Microbial Protection Improvements
Our seamless relining system provides a smooth, strong finish that effectively prevents microbial build-up and other pathogens.
8. Reduced Maintenance
Relining reduces maintenance needs. The new lining protects against future damage and extends the tank’s lifespan effectively.
9. Approved by the WRAS
Our polyurethane is solvent-free and approved by WRAS for potable water systems.
10. Allows for movement
Our lining system is durable and slightly flexible. This prevents cracks or damage from minor structural movement.

Why You Should Choose Relining Over Replacing
Tank relining, repairing, or refurbishment is a cost-effective alternative to tank replacement. It offers faster service with minimal downtime and extends the tank’s lifespan. This process complies fully with UK regulations, protects against corrosion, and prevents ingress, ensuring reliability.
UK regulations govern the coatings for water tank refurbishments. A new spray-applied polyurea lining system dries quickly, covering large areas in five seconds. The reline system is WRAS-approved, and Regulation 31/DWI approved, ensuring compliance.
Get in Touch with Comfort Services Group
Our experience and knowledge help us assess your water tank and provide customised solutions for you or your company. If you need a water tank repair or reline, or if you believe your water tank may need replacing, contact our team.
FAQs
How often should you reline your tank?
The frequency of water tank relining depends on the tank’s material, usage, and the quality of the first lining. Typically, it’s good to check the need for relining every 10 years to 20 years. Regular inspections can help find the exact timeline.
How thick is a tank liner?
The thickness of a tank liner typically depends on the tank’s use and the lining material. Generally, thickness ranges from 3mm to 5mm, but specific requirements may vary.
What is the difference between water tank lining and coating?
Water tank lining creates a protective barrier inside the tank. This prevents leaks and contamination. Coating, on the other hand, forms an external protective layer on the tank’s surface.
How long does the tank relining process typically take for water storage tanks?
Installing a replacement water tank can take weeks, but relining and repairing it takes just one day. Relining offers a faster turnaround and minimises disruption to business operations compared to replacing the tank.
What steps should be taken to prepare a drinking water tank for relining?
Proper preparation is essential for a successful tank lining. Clean and degrease the tank surface thoroughly. Remove any rust or old coating carefully. Ensure the tank is completely dry.
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