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THERMOPLASTIC STORAGE TANKS
THERMOPLASTIC STORAGE TANKS
Thermoplastic Storage Tanks are corrosion-resistant vessels manufactured entirely from thermoplastic materials such as HDPE, PP, PPH, UPVC, CPVC, PVDF, ECTFE, FEP and PFA. These tanks are widely used for the storage of aggressive chemicals, industrial liquids and process fluids where metallic tanks or coated systems are unsuitable due to corrosion, contamination or maintenance challenges.
SREX Composites offers a comprehensive range of thermoplastic storage tanks, engineered using advanced fabrication technologies to deliver high chemical resistance, dimensional stability and long service life. These tanks are particularly suited for applications requiring chemical purity, smooth internal surfaces and zero corrosion.
Materials of Construction
Thermoplastic storage tanks are manufactured using application-specific materials selected based on chemical compatibility, temperature and operating conditions:
- HDPE Storage Tanks – Suitable for a wide range of chemicals, water and industrial liquids
- PP / PPH Storage Tanks – Ideal for higher temperature chemical storage
- UPVC / CPVC Storage Tanks – Used for acids, alkalis and corrosive solutions
- PVDF Storage Tanks – Designed for highly aggressive and high-purity chemicals
- ECTFE, FEP & PFA Storage Tanks – For extreme chemical resistance and specialty process media
Each material is selected to ensure long-term resistance to chemical attack and environmental exposure.
Manufacturing Technology
Spiral Wound Construction
Large-diameter thermoplastic storage tanks are commonly manufactured using spiral winding technology. This method ensures uniform wall thickness, high structural integrity and smooth internal surfaces, making it ideal for industrial storage applications.
Fabrication & Welding
All joints and seams are formed using controlled thermoplastic welding processes such as:
- Extrusion welding
- Hot gas welding
- Heated tool butt fusion (where applicable)
These processes create homogeneous, leak-free joints without corrosion paths.
PPH RECTANGULAR STORAGE TANK
PPH Rectangular Storage Tanks are designed for applications where space optimization, flat-wall geometry and higher temperature resistance are required. These tanks are manufactured using PPH sheets and are structurally reinforced using rectangular metal sections, which are fully encapsulated with thermoplastic and FRP layers to prevent corrosion and rusting.
This construction provides excellent dimensional stability, high rigidity and long service life in chemically aggressive environments.
Typical Applications
- Chemical process tanks
- Pickling and plating tanks
- Wastewater equalization tanks
- Process water and utility storage
- Space-constrained industrial installations
HDPE SPIRAL TANK
HDPE Spiral Tanks are manufactured using spiral winding technology, making them ideal for large-diameter and high-capacity storage requirements. These tanks provide excellent resistance to a wide range of chemicals, water and fuels while maintaining structural integrity and leak-free performance.
HDPE spiral tanks are widely used due to their lightweight construction, ease of installation and long service life.
Typical Applications
- Chemical storage tanks
- Water and wastewater storage
- Effluent holding tanks
- Fuel and utility storage
- Industrial liquid containment
PP SPIRAL TANK
PP Spiral Tanks are designed for higher temperature chemical storage applications where HDPE may not be suitable. Manufactured using spiral winding and extrusion welding, PP spiral tanks provide excellent resistance to acids, alkalis and chemical vapors.
These tanks are commonly used in chemical processing plants and surface treatment industries.
Typical Applications
- Acid and alkali storage
- Chemical process liquids
- Scrubber liquor storage
- Electroplating chemical storage
Key Advantages
- Excellent corrosion resistance
- No rusting, scaling or coating failure
- Smooth internal surface for easy cleaning
- High chemical purity
- Lightweight construction
- Low maintenance requirements
- Long service life
- Customizable capacities and configurations
Design Standards & Compliance
Thermoplastic Storage Tanks manufactured by SREX Composites are designed, fabricated and inspected in accordance with internationally recognized standards:
- DVS 2205-2
Design and calculation of thermoplastic tanks and vessels, including wall thickness determination, allowable stresses, deformation limits and long-term creep behavior. - DVS 2207 Series
Standards for welding of thermoplastics, covering extrusion welding, hot gas welding and heated tool welding processes. - DVS 2212
Testing and evaluation of thermoplastic weld joints. - EN 12573 (where applicable)
Thermoplastic static tanks for above-ground storage of chemicals. - ASTM D1998 (application-specific reference)
Material and performance reference for polyethylene tanks.
All fabrication and welding activities are carried out by qualified thermoplastic welders under controlled conditions.
Comparison: Thermoplastic vs FRP/GRP vs Thermoplastic-Lined FRP Storage Tanks
Parameter | Thermoplastic Storage Tanks | FRP / GRP Storage Tanks | Thermoplastic-Lined FRP / GRP Storage Tanks |
Primary Construction | Homogeneous thermoplastic | Glass fiber reinforced thermoset | Thermoplastic liner + FRP shell |
Corrosion Resistance | Excellent (material dependent) | Very good | Excellent (highest) |
Mechanical Strength | Moderate | High | Very high |
Temperature Resistance | Limited by polymer | Higher | Higher (liner dependent) |
Pressure Capability | Low to moderate | Moderate to high | High |
Structural Rigidity | Lower | High | Very high |
Chemical Permeation | Good | Good | Excellent |
Suitable for Highly Aggressive Chemicals | Yes | Limited | Yes (preferred) |
Typical Manufacturing | Spiral winding, welding | Filament winding, molding | Lining + FRP fabrication |
Design Standards | DVS 2205-2, DVS 2207 | ASME RTP-1, ASTM, BS EN 13121-3 | ASME RTP-1, ASTM, BS EN 13121-3 |
Maintenance | Low | Low | Very low |
Service Life | Long | Long | Very long |
Relative Cost | Low to moderate | Moderate | Higher initial |
Selection Guidance
- Thermoplastic Storage Tanks are ideal for known chemical services, low-pressure applications and where a fully corrosion-free homogeneous material is preferred.
- FRP / GRP Storage Tanks are suitable for large volumes and higher mechanical loads.
- Thermoplastic-Lined FRP / GRP Storage Tanks are recommended for highly aggressive chemicals requiring maximum corrosion resistance and structural reliability.
Quality Assurance
Each thermoplastic storage tank is manufactured under a documented quality system and undergoes:
- Raw material inspection and traceability
- Dimensional and visual inspection
- Weld seam continuity and integrity checks
- Controlled fabrication environment monitoring
- Final inspection before dispatch
Only approved materials and qualified welders are used to ensure consistent quality and long-term performance.
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