Aging GRP panel tanks remain widely used across industrial, commercial, and municipal sites thanks to their strength, corrosion-resistance, and long service life. However, like any long-term water storage system, older GRP tanks can develop issues over time — especially when exposed to harsh environments, UV, or insufficient maintenance.
Understanding the most common problems in aging GRP panel tanks and how to address them is essential to prevent costly failures and operational downtime. Below, we break down the key warning signs, causes, and best-practice repair solutions.
Panel Cracks & Surface Degradation
Why it happens:
- UV exposure
- Structural stress from water pressure
- Impact damage during maintenance or system vibration
- Aging fiberglass matrix and resin breakdown
Signs to look for:
- Visible cracks or hairlines
- Surface blistering
- Leaks around damaged areas
Fix:
- Fiber-reinforced composite repair patches
- Resin injection and re-lamination
- Panel replacement for severe cases
Panel Joint Leaks
Why it happens:
- Aging or shrinking gaskets
- Sealant deterioration
- Improper installation practices
- Tank movement or settlement
Signs:
- Wet streaks along joints
- Water pooling below tank
- Decreased stored volume
Fix:
- Gasket replacement with modern sealing materials
- Panel re-torquing to correct compression
- Sealant re-application and moisture protection coatings
Pro Tip: Routine torque checks greatly reduce long-term leakage risk.
Corrosion of Steel Components
Although GRP does not rust, steel components can — such as:
- Internal tie-rods
- Support frames
- Anchoring systems
What causes it:
- Humidity exposure
- Chemical environments
- Lack of protective coatings
Fix:
- Replace corroded steel parts with stainless steel or epoxy-coated hardware
- Install anti-corrosion anodes where suitable
- Apply protective coatings and moisture control systems
Structural Deformation & Bulging Panels
Why it happens:
- Loss of internal bracing tension
- Incorrect panel torque
- Hydrostatic pressure stress
- Foundation instability
Signs:
- Panel bowing or bulging
- Tank walls shifting
Fix:
- Re-torque and reinforce internal tie-rods
- Replace weakened supports
- Inspect and repair foundation base
Severe deformation often means the tank is beyond repair — and replacement is the safest choice.
When Should You Repair vs Replace a GRP Tank?
| Condition | Solution |
|---|---|
| Minor cracks or leaks | Repair & re-seal |
| Corroded tie-rods or bolts | Replace hardware |
| Widespread panel deterioration | Re-panel sections |
| Foundation instability or severe bulging | Full replacement recommended |
If your tank is 20+ years old, a professional GRP assessment is strongly advised.
Need Professional Grp Panel Tank Repair?
Aging GRP tanks shouldn’t compromise your operations, asset reliability, or water hygiene. For expert inspection, repair, refurbishment, and replacement services, contact Raven Engineering Group — specialists in advanced composite water storage systems.
