Stainless steel tanks are often considered long-lasting and maintenance-free. However, even high-grade stainless steel can wear down under real operating conditions. When corrosion or water quality issues begin appearing, installing an internal tank liner is one of the most reliable ways to restore performance and extend the lifespan of the tank.
This article explains when stainless steel tanks need liners, what signs to look for, and how relining works, based on the approach used by Raven American Tanks across the United States.
Why Stainless Steel Tanks can Still Corrode
Stainless steel resists corrosion, but it is not immune to it. Over time, water chemistry, temperature, and environmental exposure can weaken internal surfaces.
Common factors that cause internal corrosion
- chlorine and disinfectants in municipal water.
- high temperature water or steam exposure.
- pH imbalance or mineral-heavy water.
- industrial or agricultural chemical contact.
- standing water with low circulation.
Corrosion usually starts as microscopic pitting. Once pitting forms, it can spread, leading to discoloration, leaks, and contamination risks.
Signs that a Stainless Steel Tank may Need a Liner
Early detection helps avoid costly replacements. Look for these indicators:
- Water develops metallic taste or odor.
- Rust-colored or dark staining inside the tank.
- Surface roughness or pitting.
- Small seepage around panel seams.
- Water quality test shows elevated metal content.
If any of these symptoms appear, lining the tank is often more effective than repeated cleaning or temporary patching.
When a Liner is Essential for Potable Water Safety
Potable water storage in the United States is regulated under NSF/ANSI and state-level safety standards. If a stainless steel tank corroded internally, even slightly, small amounts of metal can enter the water.
Installing a certified potable-grade liner supports safe drinking water storage in:
- Municipal & rural water supply systems.
- Food and beverage production.
- Healthcare facilities.
- Schools and public buildings.
- Farms and livestock water systems.
A liner creates a smooth, clean internal surface that is easier to sanitize and maintain.
Common Types of Tank Liners used in the United States
Different liners suit different operating conditions. Raven American Tanks installs custom liners based on water chemistry and site requirements.
Typical liner options:
- Potable-grade PVC: flexible, economical, suitable for drinking water.
- Polypropylene (PP): durable and chemical-resistant for industrial water.
- Reinforced Polyethylene (RPE): strong and UV-resistant for outdoor tanks.
- EPDM Rubber: handles temperature swings and high flexibility needs.
The goal is to select material that matches both the stored liquid and the tank environment. If your site uses modular panel-style tank systems, you may also be working with stainless steel panel tank construction, which has unique internal geometry and requires custom-fitted liner fabrication. Learn more about how these tanks.
How Relining is Performed by Raven American Tanks
Relining replaces the internal contact surface while keeping the existing tank structure.
Standard process:
- Condition assessment and tank inspection.
- Measurement and custom liner fabrication.
- Preparation and cleaning of internal surfaces.
- On-site installation and secure fitting.
- Testing to verify water integrity and performance.
This method reduces downtime and avoids the high cost of full tank replacement. Raven American Tanks provides full-service tank relining and restoration. Raven American Tanks provides full-service tank relining and restoration
Benefits of Installing a Liner in a Stainless Steel Tank
- Restores and protects water quality.
- Prevents corrosion from progressing further.
- Extends the lifespan of the existing tank.
- Reduces ongoing maintenance and cleaning frequency.
- Keeps the system compliant with potable water standards.
For many sites, relining is a practical and economical upgrade.
Why Work with Raven American Tanks
Raven American Tanks provides tank relining services across the United States, supporting potable water systems, industrial facilities, agriculture, mining operations, and commercial properties. Our team fabricates liners to precise tank measurements and installs them on-site with minimal operational disruption.
- Nationwide service coverage.
- Custom-fitted liners.
- Materials certified for safe water storage.
- Reliable installation and follow-up support.
If your stainless steel tank is showing signs of interior wear, relining may be the right approach.
Request an Assessment
To schedule a tank inspection or discuss relining options, contact Raven American Tanks. Our team will help determine whether a liner is needed and recommend the most suitable material for your application.
