Houston PolyTank manufactures the only patented, extrusion‑wound, PP rectangular tanks in the United States — engineered for industrial applications.Using our proprietary process (U.S. Patent US10150264B2), a round PP cylinder is formed into a rectangular geometry, creating a single, continuous structure with no weak points.
This patented construction method delivers the structural integrity, corrosion resistance, and long-term performance required in aggressive industrial and municipal environments. Unlike fabricated rectangular tanks made from welded sheet stock, Houston PolyTank rectangular tanks eliminate the stress-prone joints and maintenance burden of conventional designs – outperforming steel, stainless steel, fiberglass, and rotomolded plastic alternatives.
Why Shape Matters
Rectangular geometry isn’t just a footprint preference; it’s a functional engineering advantage that improves system fit, usable capacity, and integration into real‑world industrial and municipal environments.
Engineering Advantages of Rectangular Geometry
- Can be self-supported, without secondary supports
- Delivers superior performance for demanding flow battery applications
- Maximizes usable volume within a given high-cube shipping container
- Fits into corners, containment areas, and process layouts
- Aligns with rectangular secondary containment and equipment footprints
- Performs reliably in high‑specific‑gravity and demanding service conditions
- Improves shipping efficiency, using space more effectively than cylindrical tanks and reducing freight cost
- Can be configured for trailer frames in remote areas; tanks must be emptied before relocation
This is why rectangular tanks are often the superior choice for engineered systems and why Houston PolyTank’s patented construction elevates the geometry even further.
Material Selection for Performance and Temperature
We engineer each tank using the optimal material for its chemical compatibility and operating conditions:
- High-density polyethylene (HDPE) for applications up to 120°F
Polypropylene (PP) for high-temperature applications:
- up to 180° F for chemical applications
- 200° F for water and hot air (ductwork applications)
Material selection is based on chemical compatibility, working temperature, specific gravity, structural loading, and application environment, ensuring long‑term reliability from day one.
Structural Strength and Wall Thickness
Our extrusion‑wound rectangular tanks deliver:
High structural rigidity
Excellent impact resistance
Superior chemical resistance
Longer service life than steel, fiberglass, and fabricated plastic tanks
This is engineered infrastructure — not a commodity tank.
Available Configurations
- Internal baffles for mixing, flow control, or compartmentalization
- Custom inlet/outlet placements to match system requirements
- Integrated supports and mounting options
- Available as self-supporting rectangular tanks
- High cube standard shipping container
- Configured for trailer frames in remote areas
Large‑Scale Capacities and Deployment Options
Houston PolyTank rectangular tanks are available in capacities up to 18,000 gallons, with configurations that support both self‑supported installations and container‑mounted systems for mobile or modular deployment. Rectangular tanks can also be mounted inside steel frames, trailers, or shipping containers for mobile or transport applications — without compromising the strength of the structure.
This flexibility allows our rectangular tanks to integrate into:
Process systems
Battery‑energy storage systems
Flow batteries
Chemical handling units
Trailer‑mounted or containerized platforms
...all while maintaining the structural integrity of a seamless, extrusion‑wound design.
18,000 gallon double-wall acid tank in container
18,000 gallon polypropylene self-supported flow battery and acid rectangular tank
Why These Designs Perform Better
Traditional fabricated rectangular tanks rely on welded panels, ribs, and mechanical fasteners to achieve strength. Houston PolyTank’s patented construction:
Eliminates stress points at corners
Supports high specific‑gravity materials without reinforcement
Delivers long‑term reliability regardless of tank geometry
You get the configuration you need — without compromising structural integrity.
Applications
Houston PolyTank rectangular tanks are ideal for:
Flow battery electrolyte storage and other energy storage applications
Chemical processing
Industrial storage
Waste treatment systems
High specific‑gravity materials
Harsh chemical environments
High‑temperature process systems