Common GRP Tank Installation Mistakes & How to Avoid Them

Common Mistakes to Avoid When Installing GRP Water Tanks

Introduction

Installing a GRP (Glass Reinforced Plastic) water tank is one of the best decisions for long-term, hygienic, and durable water storage. However, even the highest-quality GRP tanks can underperform or fail prematurely if installation mistakes occur.

From foundation preparation to panel assembly and sealing, each step requires engineering precision. Poor installation can lead to leakage, deformation, contamination, and shortened lifespan—problems that are entirely avoidable with the right knowledge.

In this guide, we’ll walk through the most common installation mistakes, how to avoid them, and best practices recommended by Aquosys Limited, East Africa’s leading GRP tank manufacturer and installer.

💧 Why Proper Installation Matters

Even though GRP tanks are lightweight, modular, and easy to assemble, they rely on precise engineering alignment for optimal performance.

Correct installation ensures:

• ✅ Leak-free joints and seals

• ✅ Uniform load distribution

• ✅ Stable structure under full water load

• ✅ Extended lifespan

• ✅ Compliance with safety and hygiene standards

🔗 Explore installation best practices

🧱 1. Ignoring Foundation Preparation

❌ The Mistake:

Many installers skip proper foundation preparation, leading to uneven support. An uneven or weak base causes panel stress, cracks, and leakage over time.

✅ The Fix:

• Prepare a level, reinforced concrete base with a smooth finish

• Ensure tolerance ≤ ±2mm across the surface

• Avoid soft soil or non-compacted gravel

• Allow concrete to cure fully before installation

📏 A solid foundation is the backbone of every GRP tank.

🔗 Learn about structural characteristics

🔩 2. Incorrect Panel Assembly

❌ The Mistake:

Improper alignment of GRP panels, missing bolts, or uneven tightening during assembly can cause joint misfits and pressure imbalance.

✅ The Fix:

• Follow the manufacturer’s panel layout

• Tighten bolts in a cross-pattern sequence

• Use torque tools for consistent fastening

• Double-check gasket placement at every joint

⚙️ Precision in assembly ensures water-tight sealing and uniform load distribution.

🔗 Explore GRP panel design

💦 3. Using Incorrect Gaskets or Sealants

❌ The Mistake:

Using non-standard rubber gaskets or incompatible sealants can result in leaks or chemical degradation inside the tank.

✅ The Fix:

• Always use Aquosys-approved EPDM gaskets

• Avoid oil-based or non-potable-grade sealants

• Inspect seals for tears or misalignment before assembly

🔗 See caution guidelines

🧰 4. Neglecting Tie-Rod Reinforcement

❌ The Mistake:

Skipping or incorrectly installing internal/external tie rods leads to panel bulging, structural failure, or tank collapse under pressure.

✅ The Fix:

• Follow the reinforcement design—internal or external based on tank size

• Verify rod tension and alignment

• Use anti-corrosive coatings on metallic components

🔗 Learn about reinforcement systems

🌡️ 5. No Provision for Expansion or Insulation

❌ The Mistake:

Ignoring temperature effects or insulation needs can cause panel expansion, cracks, or condensation.

✅ The Fix:

• Allow expansion joints if the tank is exposed to heat

• Use insulated GRP panels for temperature-sensitive applications

• Protect tanks from direct UV exposure where possible

🔗 Explore insulation options

🚫 6. Skipping Leak Testing

❌ The Mistake:

Filling the tank without proper hydrostatic testing is risky. Minor leaks may go unnoticed and worsen over time.

✅ The Fix:

• Conduct hydrostatic tests after installation

• Fill tank gradually and observe for leaks or seepage

• Tighten or reseal joints where needed before handover

🔧 Testing ensures long-term reliability.

🧼 7. Poor Cleaning and Hygiene Practices

❌ The Mistake:

Not cleaning the tank before use or leaving debris inside can lead to bacterial growth and water contamination.

✅ The Fix:

• Clean all panels with potable water and mild detergent

• Flush tank before commissioning

• Use hygienic GRP panels to prevent algae and bacteria

🔗 Learn how GRP panels prevent algae

🧾 8. Ignoring Manufacturer Instructions

❌ The Mistake:

Some contractors skip the installation manual or rely on guesswork.

✅ The Fix:

• Always follow Aquosys installation guidelines

• Engage trained technicians

• Use manufacturer-approved tools and accessories

📘 Every GRP tank system has unique design specifications—don’t improvise.

🏗️ 9. Lack of Qualified Supervision

❌ The Mistake:

Unsupervised installations by untrained teams often result in assembly errors or non-compliance with design.

✅ The Fix:

• Hire certified installers from Aquosys Limited

• Ensure on-site engineering supervision

• Conduct final inspection before filling

🔗 Request expert installation support

🔍 10. Neglecting Periodic Maintenance

❌ The Mistake:

Many owners ignore regular inspection and maintenance, leading to early wear, corrosion, or seal failure.

✅ The Fix:

• Inspect joints, bolts, and gaskets every 6–12 months

• Clean tank annually

• Re-tighten bolts if necessary

• Replace worn seals

🔗 Read maintenance guidelines

💡 Summary: Key Takeaways

🧠 Why Choose Aquosys Limited

With over a decade of experience across East Africa, Aquosys ensures every GRP tank is installed to international standards, providing:
✔ Expert engineering design
✔ Professional on-site installation
✔ High-quality, hygienic GRP panels
✔ Reliable after-sales support

Serving Kenya, Uganda, Tanzania, Rwanda, Ethiopia, and South Sudan.

🔗 Contact Aquosys today

📞 Get Professional Installation Support

Aquosys Limited
📧 sales@aquosys.co.ke
📞 +254 754 750 750 | +254 729 749 749
🌐 Get in Touch