Go Back

Thermoplastic-Lined FRP Water Tanks

Thermoplastic-lined FRP tanks (also called dual-laminate tanks) combine a fiber-reinforced plastic shell with an inner thermoplastic liner (such as HDPE, PVC, PP, PVDF, etc.). The rigid FRP provides structural strength and pressure capacity, while the seamless plastic liner offers exceptional chemical resistance and purity. These tanks are ideal for storing highly corrosive fluids or ultra-pure water where even inert FRP might be attacked. Thermoplastic liners are odourless and inert, ensuring the tank contents remain uncontaminated. Typical lining materials include PVC, CPVC, PP, PTFE, PVDF, and other specialty polymers.

Product Inquiry

Key Features

Dual Laminate Construction: Inner thermoplastic liner fully encapsulated by FRP for strength.
Broad Chemical Compatibility: Liners available in PTFE, PP, PVC, ECTFE, etc., to suit acids, bases, solvents and ultrapure water.
Leak-Proof Welds: Welded thermoplastic seams and corners ensure no leakage of corrosive media.
Durable FRP Shell: Provides pressure/vacuum resistance and mechanical support.
Smooth, Non-Porous Liner: Prevents adhesion of chemicals or bacteria for hygienic applications.

Benefits

Ultimate Corrosion Resistance: Handles the most aggressive chemicals without degradation.
Clean Operation: No reaction between lining and contents; ideal for ultrapure or food-grade liquids.
Extended Tank Life: Thermoplastic liner protects the FRP shell from chemical attack, extending service life.
Customized Chemistry: Engineers can select liner material to match specific process fluids.
Minimal Maintenance: Liners are inert and durable; internal FRP no longer exposed to chemicals.

Applications

Storage of acids (e.g. sulfuric, hydrochloric) and alkalis (e.g. caustic lye) in chemical plants.
Pickling and plating tanks in metal finishing (acid/alkali baths).
Demineralized/potable water in pharmaceutical or semiconductor industry.
Ultra-pure water and reagent tanks in laboratories.
Corrosive wastewater holding and equalization.

Technical Specifications

Liner Materials: PP, PVC, CPVC, PVDF, ECTFE, PTFE, FEP (thickness typically 3–6 mm).
FRP Exterior: Vinylester or epoxy resin for added corrosion protection.
Pressure Rating: Usually low-pressure (atmospheric to ~1 bar); design per ASME RTP-1 or custom codes.
Temperatures: Depends on liner (e.g. PVC to 60°C, PVDF to 80°C, PTFE up to 150°C).
Manufacture: Liner fabricated to shape, tested, then FRP layers applied via hand lay-up or filament winding.

Unique Selling Points (USPs)

Versatility: One tank can handle both mechanical load and extreme chemistry.
Odor-Free: Liners produce no taint or odor in contents.
Regulatory Compliance: Materials selected for compliance with FDA, NSF or EU standards for clean water.
Cost Savings: Cheaper than exotic alloy tanks for same resistance.
Adaptable Designs: Liners can be field-welded to unusual shapes or existing tanks for upgrades.