19 Août 2026

PVC Liners for Liquid Storage Tanks

A leaking storage installation can lead to losses, environmental risks, and unexpected costs. A PVC liner is the go-to sealing solution for securing liquid storage in industrial, agricultural, and municipal applications, whether for new bolted steel tanks, existing welded steel tanks, or concrete structures.

Key Takeaways

• PVC liner: a flexible membrane that provides complete sealing for a tank or basin.
• It protects the structure against corrosion and infiltration.
• Resistant to chemicals, it is suitable for industrial, agricultural, and municipal applications.
• Its service life can reach 20 to 30 years with regular maintenance.
• APRO Industrie supplies factory-prefabricated APRO membranes: high-tenacity polyester-reinforced, one-piece and custom-made, for both new tanks and the refurbishment of existing tanks.

What is a PVC Tank Liner?

PVC Geomembrane: Synthetic, impermeable membrane used to seal basins, tanks, or channels. It is characterized by its flexibility, chemical resistance, and long service life.

This high-performance composite membrane is installed inside a tank to create an impermeable barrier. Unlike a simple PVC film, the APRO membrane is polyester-reinforced PVC: two layers of PVC surrounding a woven high-tenacity polyester scrim (1,100 dtex). This composite structure provides a tensile strength of ≥ 3,700 N/5 cm in the machine direction and ≥ 3,380 N/5 cm in the cross direction, as well as a tear strength of ≥ 670/690 N. This level of mechanical performance, which is entirely absent from a standard swimming-pool liner, ensures long-term durability in industrial installations. The membrane conforms perfectly to the internal structure and is mechanically secured at the top.

Why is it essential in a storage installation?

This sealing membrane performs three essential functions in storage systems.

Sealing, protection, and regulatory compliance

The membrane prevents any leakage between the stored liquid and the installation wall. It protects metal structures against corrosion and reduces the risk of contamination. It also helps installations comply with ICPE (Classified Installations for Environmental Protection) requirements, ensuring that sealed installations meet applicable regulatory requirements.

Advantages of PVC Liners for Liquid Storage

Several factors explain the success of this PVC membrane in liquid storage projects.

Durability, temperature resistance, and UV protection

Designed to last 20 to 30 years, this lining withstands mechanical stress, temperature fluctuations, and common chemicals. Its chemical resistance makes it compatible with diluted acids, alkalis, and light hydrocarbons. In terms of temperature performance, the membrane withstands a range of −35°C to +75°C, a decisive advantage for installations exposed to severe thermal cycling. UV protection is integrated into the membrane's surface coating: it is a structural feature, not an optional treatment, ensuring long-lasting protection for outdoor tanks. Its flexibility also optimizes the usable storage volume without reducing capacity.

Applications: Industry, Agriculture, Municipalities, and Refurbishment

The PVC tank liner is suitable for a wide range of sectors.

Industry, agriculture, municipalities, and refurbishment of existing structures

In industry, it is used in industrial installations for storing process water, chemicals, and effluents. In agriculture, it secures the storage of slurry, rainwater, or liquid fertilizers in watertight agricultural tanks. Municipalities use it for potable water tanks, retention basins, and hydraulic structures.

Double sealing for chemically aggressive liquids

For the storage of industrial effluents, acidic or alkaline products, or light hydrocarbons, the PVC membrane is often specified as an additional sealing barrier inside a tank whose steel shell provides structural strength only. This double-sealing configuration, common in the chemical and petrochemical industries, is essential where steel alone cannot withstand the aggressiveness of the stored liquid.

Refurbishing existing tanks: extending service life at a lower cost

The membrane is not limited to new tanks. It can be installed in both existing welded steel tanks and concrete structures. A cracked concrete tank or a corroded steel tank does not necessarily require complete reconstruction: installing a membrane restores watertightness at a fraction of the cost, extends the service life of the structure, and ensures compliance with current regulatory requirements.

Installation and Maintenance of a PVC Liner

The APRO membrane is cut and welded at the factory to the exact dimensions of the tank before delivery, so there is no welding on site. This prefabricated, one-piece approach eliminates the risk of assembly defects and ensures consistent watertightness across the entire surface from commissioning. On-site installation then follows a rigorous process to ensure long-term tank watertightness.

Installation and Maintenance Steps

Preparation: cleaning and inspection of the internal walls.
Custom cutting: the membrane is cut to the exact dimensions of the installation.
Positioning and anchoring: the membrane is installed and mechanically anchored at the top.
Joint welding: connections are heat-welded to ensure complete watertightness.
Leak testing: final inspection before commissioning.

Maintenance is limited to regular visual inspections. In the event of damage, a localized patch repair is sufficient to restore watertightness.

Discover our maintenance and after-sales service

How to Choose the Right PVC Liner

The right liner depends on the type of liquid being stored, the tank dimensions, and the exposure conditions. Key criteria include:

• Thickness: from 0.5 to 2 mm depending on the pressure exerted.
• Chemical resistance: must be assessed according to the products being stored.
• Integrated UV protection: UV treatment incorporated into the surface coating, a structural feature essential for any outdoor installation (−35°C to +75°C).
• Sanitary certifications: mandatory for potable water storage.

Working with an expert ensures the liner is properly selected and installed in accordance with applicable standards.

APRO Industrie Expertise in Sealing Solutions

Since 1987, APRO Industrie has been designing, manufacturing, and installing bolted steel tanks incorporating custom-made APRO membranes: high-tenacity polyester-reinforced, factory-prefabricated, and delivered as one-piece liners. The offering covers both new construction and the refurbishment of existing welded steel tanks and concrete structures. Its technicians support every project from design through commissioning, with maintenance support included. Each sealing solution is tailored to the specific site requirements, whether for industrial, agricultural, or municipal applications.

PVC Tank Liner FAQ

What is a PVC tank liner?

A flexible PVC membrane installed inside a tank to provide complete watertightness and protect its walls.

Why use a PVC tank liner for sealing?

It prevents leaks, protects the structure against corrosion, and helps ensure regulatory compliance for liquid storage installations.

How long does a PVC liner last?

Between 20 and 30 years with regular maintenance and professional installation.

How do you maintain a PVC sealing membrane?

Regular visual inspections are sufficient. In the event of a puncture, a tank liner patch repair can quickly restore watertightness.

How do you choose the right PVC membrane?

The selection should take into account the type of liquid being stored, the tank dimensions, exposure conditions, and applicable standards. An expert such as APRO Industrie can guide you toward the most suitable sealing solution.