| Storage Capacity | Approximately 1,000–500,000 liters | Small tanks are used for households and emergency supply; larger tanks are commonly used for agriculture, construction, and municipal projects. | Confirm the usable volume, filled dimensions, and transport dimensions. |
| Tank Material | PVC-coated polyester or TPU-coated fabric | The fabric normally combines a woven polyester base with a flexible, water-resistant coating. | Request fabric composition, coating thickness, tensile strength, and aging test results. |
| Water-Contact Safety | Potable-water options available for qualified products | Materials intended for drinking water should be tested for migration, odor, taste, and applicable chemical limits. | Ask for a current third-party drinking-water compliance report for the exact material. |
| Welding Technology | High-frequency, hot-air, or heat-sealing processes | The selected process depends on the fabric coating, tank size, seam design, and production equipment. | Check seam strength, weld consistency, corner reinforcement, and repair procedures. |
| Operating Temperature | Often around −30°C to 70°C, depending on material | Actual limits vary with the PVC or TPU formulation, liquid type, exposure time, and environmental conditions. | Select the temperature range from the manufacturer’s technical data sheet, not a general catalog range. |
| Fittings and Connections | PVC, stainless-steel, or polypropylene fittings | Common configurations include inlet, outlet, drain, air-release, inspection, and overflow connections. | Confirm connection diameter, thread or flange standard, location, and material compatibility. |
| Leak Testing | Individual inspection and pressure or water-fill testing | Quality programs commonly include visual seam inspection, dimensional checks, and leak testing before shipment. | Request inspection records, acceptance criteria, and a documented quality-control procedure. |
| Customization Capability | Custom dimensions, fittings, labels, colors, and packaging | Flexible tanks can be designed for restricted spaces, irregular foundations, special access points, or project-specific connections. | Provide a drawing showing capacity, footprint, connection positions, liquid type, and installation conditions. |
| Installation Requirements | Flat, clean, smooth, and adequately supported ground | The installation surface should be free from sharp stones, oil, debris, and objects that could damage the fabric. | Verify whether a protective mat, bund, cover, or anchoring system is required. |
| Typical Applications | Drinking water, rainwater, irrigation, firefighting, and wastewater | The suitable tank construction depends on the stored liquid, hygiene requirements, chemical exposure, and expected service environment. | Confirm liquid compatibility before ordering, particularly for wastewater or chemically treated water. |
| Portability and Storage | Foldable construction with relatively low empty weight | When empty and clean, flexible tanks generally occupy less space than rigid tanks of equivalent capacity. | Request folded dimensions, packed weight, recommended folding method, and storage conditions. |
| Documentation and Export Support | Product drawings, material data, inspection records, and shipping documents | Experienced exporters typically provide technical specifications and documents needed for international delivery and installation. | Check the completeness of the technical file, packaging details, warranty terms, and after-sales support. |