In many homes, buildings, and industrial places, GRP (Glass Reinforced Plastic) tanks are used to store water and other liquids. These tanks are strong, lightweight, and long-lasting. That’s why they are used so widely. But like any other material, GRP tanks can develop problems over time. One of the most common issues is leakage.
Leaks in GRP tanks can cause serious trouble—wasting water, damaging property, and even leading to health risks if not fixed quickly. To prevent leaks or handle them properly, it is very important to understand what causes them in the first place.
In this blog, we’ll explain the most common reasons why GRP tanks leakage and how you can spot these issues early. We’ll also give tips on how to reduce the chances of GRP tanks leakage in the future.
What Is a GRP Tank?
A Simple Introduction to GRP Tanks
GRP stands for Glass Reinforced Plastic, which is a strong material made from plastic mixed with glass fibers. This combination makes the tank tough and weather-resistant. GRP tanks are commonly used for storing:
- Drinking water
- Firefighting water
- Wastewater
- Chemicals (in some industries)
They can be found on rooftops, underground, or inside buildings.
Why Do GRP Tanks Leak?
Understanding the Main Reasons for Tank Leakage
GRP tanks are built to last for many years, but leaks can happen due to several reasons. Some of these problems are caused by natural wear and tear, while others are due to poor installation or external damage.
Let’s take a closer look at each common cause.
1. Poor Installation
Wrong Setup Can Lead to Early Leaks
One of the leading causes of GRP tank leakage is improper installation. If the tank is not placed on a flat and strong base, it may become uneven. This puts pressure on certain parts of the tank wall and can cause cracks over time.
Other installation problems include:
- Loose joints or fittings
- Incorrect sealing around inlets and outlets
- Bad alignment of tank panels (for sectional tanks)
A tank that is not installed the right way will always be at a higher risk of leaking.
2. Physical Damage
External Hits and Accidents Matter
GRP tanks are tough, but they are not unbreakable. If something hits the tank hard—like falling tools, sharp objects, or heavy construction equipment—it can crack the surface.
This kind of damage is more likely if:
- The tank is in a busy or open area
- There is regular foot or vehicle traffic around the tank
- Maintenance tools are used carelessly near the tank
Even small cracks from impact can grow bigger over time and cause leakage.
3. Aging and Wear
Old Tanks Are More Likely to Leak
Just like any other material, GRP gets weaker as it gets older. Over time, the plastic can lose flexibility, and the glass fibers inside can break down. This process is called material fatigue.
Common signs of aging include:
- Tiny surface cracks
- Fading or chalky tank surface
- Weakness at the joints or corners
Most GRP tanks last around 10–25 years, depending on their quality and how well they are maintained.
4. Exposure to Sunlight (UV Rays)
Sunlight Can Damage the Tank Surface
When GRP tanks are placed on rooftops or outdoor areas, they are exposed to direct sunlight every day. Ultraviolet (UV) rays from the sun can slowly weaken the outer layer of the tank.
This leads to:
- Surface brittleness
- Cracks or peeling
- Color fading
Once the outer surface is weak, water pressure from inside the tank can cause small cracks to open and leak.
5. Faulty or Worn Out Seals
The Weakest Link Could Be the Rubber Seal
GRP tanks usually have rubber gaskets or seals between panels and around pipes. These seals are very important to stop water from escaping.
But over time, rubber seals can:
- Shrink
- Crack
- Become hard and lose flexibility
- Get misplaced during cleaning or maintenance
A tiny gap in a seal is enough to cause leakage, especially when the tank is full.
6. Chemical Reaction or Water Quality
Some Liquids Can Damage GRP Material
Although GRP is resistant to many chemicals, some strong substances can slowly eat away at the tank walls. This is more common in industrial tanks that store:
- Acidic or alkaline water
- Wastewater with high chemical content
- Oils or fuel products
Even in regular water tanks, hard water with high mineral content can cause scaling, which weakens the tank over time.
7. Poor Maintenance
Neglecting the Tank Can Lead to Leaks
Many people forget that even storage tanks need regular care. Without cleaning and inspection, small issues can become big problems.
Poor maintenance can lead to:
- Buildup of dirt or algae
- Blocked overflow pipes
- Corroded fittings
- Ignored surface cracks
Cleaning the tank at least twice a year and checking for signs of damage can help avoid leakage.
8. Overfilling the Tank
Too Much Pressure Can Be Risky
GRP tanks are designed to handle a certain volume of water. If you fill the tank beyond its limit or allow overflow often, it puts pressure on the tank walls and joints.
This may result in:
- Deformation of the tank shape
- Damage to the base or foundation
- Joint failure and leakage
Always use a float valve or auto shut-off system to avoid overfilling.
What Are the Signs of a Leaking GRP Tank?
How to Spot the Problem Early
Catching a leak early can save you from bigger repairs and water damage. Look out for these warning signs:
- Wet patches or puddles near the tank base
- Visible cracks or moisture on the tank wall
- Drop in water levels without usage
- Mold or algae near the tank area
- Rusted metal around pipe joints
If you notice any of these, it’s time to inspect the tank carefully.
How to Prevent GRP Tank Leaks?
Simple Steps for Long-Term Protection
Preventing leaks is easier (and cheaper) than repairing them. Follow these tips:
1. Install the Tank on a Strong, Flat Base
The foundation should support the tank evenly to avoid stress points.
2. Use High-Quality Seals and Fittings
Invest in good materials during installation and replacement.
3. Clean and Inspect the Tank Regularly
Remove algae, dirt, and check for cracks at least twice a year.
4. Protect the Tank from Direct Sun
Use a cover or shade net to reduce UV damage.
5. Avoid Chemical Exposure
Store only approved liquids in the tank and monitor water quality.
6. Hire Experts for Maintenance
Professional services can spot problems before they get worse.
Conclusion
Stay Ahead of Tank Leaks with Good Knowledge and Care
GRP tanks are a smart and reliable choice for water storage, but they are not free from problems. Leaks can happen, and they often start from small, unnoticed issues.
By understanding the common causes of GRP tank leaks—like poor installation, aging, UV exposure, and lack of maintenance—you can take better care of your tank and avoid costly repairs.
Make regular checks a habit, fix small issues early, and when needed, get help from professionals. A well-maintained GRP tank not only lasts longer but also keeps your water safe and your space dry.
For more insightful articles related to this topic, feel free to visit: The Star Biz News.
