Leakage Prevention Measures for Welded and Bolted Water Tanks

For water tank buyers, construction contractors, and end users, preventing leakage is one of the most important factors when selecting a water storage system. Reliable sealing performance ensures long-term operation, reduces maintenance costs, and improves overall system safety.

The leakage prevention performance of steel sectional water tanks mainly depends on three key factors:

• Panel structure and manufacturing precision
• Sealing system
• Installation process

According to different connection methods, modular water tanks can generally be divided into welded water tanks and bolted water tanks. Their leakage prevention methods are also different.

Leakage Prevention Measures for Welded Water Tanks

Common welded water tanks include welded stainless steel water tanks and welded ribbed stainless steel water tanks. These tanks are manufactured by assembling pre-formed panels through welding processes.

The sealing performance of welded water tanks mainly depends on the following factors:

1. Accurate Panel Dimensions and Flatness

The accuracy and flatness of tank panels are the foundation of high-quality welding assembly.

Standardized panel dimensions and smooth surfaces can:

• Reduce assembly errors
• Ensure consistent welding gaps
• Improve welding quality

2. Internal Tie Rods and Support Structures

For large-capacity water tanks, proper internal reinforcement is essential.

Internal structures such as:

• Tie rods
• Support bars
• Reinforcement components

can effectively:

• Improve overall structural stability
• Prevent tank deformation caused by water pressure
• Reduce stress on welded joints

3. Welding Technology and Experience

Welding quality is the most direct factor affecting leakage performance.

A professional welding process includes:

• Proper welding sequence
• Control of welding deformation
• Complete and continuous weld seams
• Prevention of incomplete welding and welding defects

The most common leakage problem in welded tanks is caused by welding defects.

After welding, experienced technicians usually perform a water-tightness inspection.

One common method is the kerosene penetration test:

Kerosene is sprayed onto the external weld seams of the tank and left for approximately 30–60 minutes. The internal weld areas are then checked for:

• Kerosene penetration marks
• Liquid reflection
• Visible leakage traces

Due to its excellent penetration ability, kerosene is effective for identifying small welding defects. For high-standard projects, professional inspection equipment can also be used.

Leakage Prevention Measures for Bolted Water Tanks

Unlike welded tanks, bolted modular water tanks do not rely on continuous welding for sealing. Instead, they prevent leakage through:

• High-performance sealing materials
• Proper bolt connection design
• Reinforced panel structures

1. High-Performance Sealing Materials (Core Leakage Prevention)

Bolted modular water tanks usually use food-grade EPDM sealing gaskets.

Features include:

• Installed between tank panels
• Excellent elasticity
• Strong aging resistance
• Adaptability to temperature changes and minor deformation

Additional sealant can be applied as secondary protection at:

• Bolt holes
• Panel joints
• Special connection areas

This improves long-term leakage resistance.

2. Bolt Connection Structure Design

Bolted water tanks use:

• Stainless steel bolts
• Nuts
• Washers
• Reinforcement connectors

Proper tightening creates stable pressure between panels, allowing the gasket to achieve effective sealing.

Correct bolt installation is critical:

• Loose bolts → insufficient sealing pressure and possible leakage
• Over-tightened bolts → excessive gasket compression and reduced service life

3. Optimized Panel Structure

High-quality modular water tanks usually adopt:

• Press-formed panels
• Ribbed reinforcement structures
• Precision mold processing

Advantages:

• Higher panel strength
• Reduced deformation under full water pressure
• Stable sealing pressure between panels

For example, a 3-meter-high water tank experiences greater pressure at the bottom and side panels, requiring appropriate panel thickness and reinforcement design.

4. Internal Reinforcement System

Large modular water tanks are usually equipped with:

• Internal tie rods
• Support components
• Reinforcement angles

Their functions include:

• Preventing tank expansion caused by water pressure
• Maintaining overall tank dimensions
• Reducing stress changes at sealing joints

5. Professional Installation Control

In many cases, water tank leakage is not caused by product quality but by improper installation.

During installation, attention should be paid to:

✅ Checking foundation levelness
✅ Cleaning panel connection surfaces
✅ Installing sealing gaskets correctly
✅ Tightening bolts according to the required sequence
✅ Performing a full water test after installation

Normally, a 24–72 hour water filling test is required after installation to confirm that there is no leakage before the tank is put into operation.

Reliable Modular Water Tank Manufacturer

With 16 years of experience in modular water tank manufacturing and installation, we are one of the leading manufacturers in China.

We specialize in producing:

• Stainless steel water tanks
• Hot-dip galvanized steel water tanks
• FRP water tanks
• Ribbed water tanks
• Insulated water tanks
• Cylindrical storage tanks

With thousands of successful installation projects, we provide professional panel manufacturing, customized solutions, and installation support to ensure reliable long-term performance of every water storage system.

If you have any questions or requirements regarding water tanks, please feel free to contact us for a professional solution.

Faq