| Rotomolded Vertical Tank |
Approximately 500–25,000 L; larger sizes may require special engineering and transport planning. |
Seamless rotationally molded linear polyethylene or cross-linked polyethylene, usually with a flat or reinforced base. |
Water, rainwater, agricultural liquids, mild chemicals, wastewater, and non-pressurized process storage. |
Often specified for ambient service; many designs are used around 0–60°C, but the exact limit depends on resin, wall thickness, chemical concentration, and load. |
ASTM D1998 may be used for vertical polyethylene storage tanks. Drinking-water applications may require NSF/ANSI 61, regional potable-water approval, or equivalent national requirements. |
Not normally designed for internal pressure. Install on a level, adequately supported foundation; provide suitable venting, overflow control, access protection, and secondary containment where required. |
Polyethylene is lightweight, corrosion-resistant, and widely recyclable as HDPE or PE when clean and properly segregated. Long service life can reduce replacement waste. |
Broadly suitable
Well suited to general storage and locations where corrosion resistance and low shipping weight are important. |
| Horizontal Polyethylene Tank |
Approximately 500–15,000 L for common transportable and stationary configurations. |
Linear polyethylene with molded legs, cradles, or a dedicated support frame; some designs include internal baffles. |
Water, liquid fertilizer, agricultural chemicals, utility fluids, and mobile or low-profile storage. |
Commonly limited to ambient-temperature service; confirm the manufacturer’s temperature derating for the stored liquid and transport conditions. |
ASTM D1998 is relevant to many polyethylene tank designs. Transport use may also require local road, dangerous-goods, or load-securing rules. |
Use only the designed support points. During transport, control liquid movement, secure the tank against sliding or overturning, and avoid filling beyond the rated level. |
Low mass can reduce transport energy compared with heavier metal alternatives. Recyclability depends on the polymer type, additives, contamination, and local recycling infrastructure. |
Good for mobility
Useful when height restrictions, vehicle mounting, or horizontal access is a priority. |
| Double-Wall Polyethylene Tank |
Approximately 1,000–15,000 L for common above-ground installations. |
Primary polyethylene tank enclosed by an integral secondary polyethylene containment wall or outer vessel. |
Diesel exhaust fluid, oils, water-treatment chemicals, corrosive liquids, and applications requiring spill control. |
Temperature limits vary significantly with the primary liquid, tank design, and containment geometry; verify both inner and outer-wall ratings. |
Applicable requirements may include ASTM D1998 for the primary tank, local fire codes, environmental-containment rules, and chemical-storage regulations. |
Secondary containment reduces the consequence of a primary-wall leak but does not replace inspection, leak detection, compatible fittings, overfill prevention, or an emergency response plan. |
Uses more polymer than a single-wall tank but can reduce soil and water contamination risk. The two-wall construction may complicate end-of-life material separation. |
Higher protection
Recommended where spill prevention, environmental permitting, or sensitive-site protection is critical. |
| FRP/GRP Composite Tank |
Approximately 1,000–100,000 L, depending on orientation, resin system, and structural design. |
Glass-fiber-reinforced thermoset resin, commonly with a corrosion-resistant inner liner and structural laminate. |
Industrial chemicals, water treatment, brine, wastewater, mineral processing, and corrosive process liquids. |
Often suitable for a wider process-temperature range than standard polyethylene, but the limit is highly dependent on resin, liner, chemical concentration, and pressure conditions. |
Designs may reference EN 13121, ASTM D3299, ASTM D4097, or other project-specific pressure and storage requirements. The applicable standard must match the tank type and service. |
Confirm chemical compatibility, laminate design, nozzle loads, foundation requirements, inspection access, and whether the vessel is atmospheric or pressure-rated. Avoid unauthorized modification or drilling. |
Typically has a long service life and strong corrosion resistance. Thermoset composites are more difficult to recycle mechanically than thermoplastic polyethylene. |
Industrial use
Appropriate for larger capacities and corrosive services when engineering documentation is available. |
| Polypropylene Process Tank |
Approximately 500–30,000 L for fabricated or molded process vessels. |
Welded or fabricated polypropylene sheet, sometimes combined with ribs, liners, or structural supports. |
Acid pickling, plating chemicals, laboratory and industrial wastewater, and selected high-purity process liquids. |
Polypropylene can offer higher temperature capability than polyethylene in some services, but actual limits depend on stress, chemical concentration, weld quality, and tank geometry. |
Fabrication may be controlled by DVS welding guidance, EN or ASTM project specifications, chemical-compatibility requirements, and local pressure-vessel rules where applicable. |
Usually intended for atmospheric service. Inspect welds, supports, fittings, and thermal expansion allowances; do not assume compatibility solely from the chemical name. |
Polypropylene is a recyclable thermoplastic in suitable waste streams, although welded assemblies, liners, contamination, and additives can reduce recycling options. |
Process-focused
Strong candidate for selected chemical and wastewater services after a documented compatibility review. |
| Potable-Water Polyethylene Tank |
Approximately 500–20,000 L for residential, commercial, emergency, and rainwater systems. |
Food-contact-grade polyethylene with opaque or UV-stabilized construction to limit light penetration and algae growth. |
Drinking water, rainwater harvesting, emergency water storage, and non-pressurized municipal or building systems. |
Generally intended for cool or ambient water service; protect from freezing, excessive heat, and prolonged direct solar exposure unless specifically rated. |
Potential requirements include NSF/ANSI 61, FDA 21 CFR 177.1520 for applicable food-contact polymers, EU Regulation No. 10/2011, WRAS, or equivalent local approval. |
Use potable-water-approved liners, seals, valves, and hoses throughout the system. Prevent cross-connection, provide hygienic access covers, and follow local cleaning and disinfection procedures. |
Long life, low corrosion, and low transport weight are advantages. Opaque construction can help reduce biological growth and cleaning frequency. |
Water approved
Suitable only when the complete wetted system—not merely the tank shell—meets the destination market’s potable-water requirements. |
| Underground Polyethylene Tank |
Approximately 1,500–15,000 L for common residential, commercial, and light industrial systems. |
Engineered polyethylene vessel with ribs or structural reinforcement designed for burial and external soil loads. |
Rainwater, sewage, septic systems, wastewater, and underground utility storage. |
Usually suitable for buried ambient-temperature service; groundwater, freeze conditions, chemical exposure, and soil temperature must be evaluated during design. |
Requirements vary by country and use. Relevant specifications may include EN 12566 for certain small wastewater-treatment products, local septic regulations, and installation standards for underground tanks. |
Correct excavation, bedding, anchoring, backfill, access-cover loading, buoyancy control, and pipe flexibility are essential. Do not bury an above-ground tank unless it is specifically engineered for burial. |
Preserves above-ground space and resists corrosion, but excavation has significant site impacts. End-of-life recovery is more difficult than for accessible above-ground tanks. |
Site-dependent
Effective where land use or visual impact matters, provided local soil, groundwater, and installation requirements are satisfied. |
| Intermediate Bulk Container (IBC) |
Commonly 500–1,000 L per container, with larger systems requiring multiple units or specialized designs. |
Rigid polyethylene inner bottle in a steel cage, mounted on a pallet base, with a top fill opening and bottom discharge valve. |
Bulk transport and temporary storage of water, food ingredients, detergents, and compatible non-dangerous or dangerous liquids. |
Often used at ambient temperature; confirm the liquid-specific filling, stacking, transport, and temperature restrictions. |
UN Recommendations on the Transport of Dangerous Goods may apply to certified IBCs, including the relevant 31H classification for composite IBCs. Food applications require separate food-contact compliance. |
Check the UN mark, packaging group, closure integrity, inspection interval, stacking rating, valve protection, and compatibility. Do not reuse a container for potable water without verified cleaning and approval. |
Reusable IBCs can reduce packaging waste. Damaged or contaminated units require controlled cleaning, refurbishment, or recycling through appropriate industrial channels. |
Logistics-oriented
Best for international shipment, modular storage, and lower-volume bulk handling rather than permanent large-scale storage. |
