DERFLEX supplies heavy duty tarpaulin tanks and reinforced PVC coated fabric solutions for portable water storage, irrigation, construction, emergency response, aquaculture and selected industrial liquid-containment projects. Tank capacity, fabric weight, thickness, fittings, color and fabrication details can be matched to the real operating conditions of the project.
Capacity, liquid type, ground condition, filling method, valve layout, climate, deployment frequency and service cycle should be confirmed before material and tank construction are finalized.
The load-bearing polyester fabric provides tensile and tear strength, while the PVC coating creates the waterproof and weldable barrier. Depending on the application, the finished system can be fabricated as a closed pillow or bladder tank, a self-supporting onion tank, a frame-supported open tank or an aquaculture tank. For reliable performance, buyers should match the coated fabric, seam design, fittings, capacity and ground protection to the stored liquid and actual site conditions.
Rigid tanks are useful for permanent installations, but they can be expensive or difficult to transport into temporary, remote or changing worksites. A collapsible tarpaulin tank is compact when empty and can be deployed close to the point of use.
A good procurement specification starts with how the tank will be filled, emptied, accessed, moved and supported. Material weight alone does not determine whether a tank is suitable.
A closed flexible tank that expands as it fills. Often selected for compact transport, temporary bulk water storage, irrigation, remote sites and projects where contamination control is important.
An open-top or covered self-rising tank designed for fast filling and quick field access. Common project directions include emergency water, firefighting reserve, wash-down and temporary site supply.
A coated-fabric liner supported by a steel or tubular frame. It is useful when an open working tank, predictable shape or repeated access is required.
Circular or custom tanks for fish farming, shrimp farming, RAS, quarantine and temporary water management. Fabric selection should reflect water chemistry, outdoor exposure and cleaning cycles.
When footprint, transport space or equipment layout is limited, tank geometry can be developed around the project drawing rather than a standard catalog size.
DERFLEX also supplies weldable PVC or TPU coated fabric to tank fabricators that need roll goods, custom width, coating direction, color and repeatable production specifications.
These ranges are practical starting points drawn from existing DERFLEX flexible-tank and water-tank fabric directions. Final values should be confirmed for each order because capacity, tank geometry, liquid compatibility, climate and service cycle change the required structure.
| Item | DERFLEX Project Direction | Buyer Selection Note |
|---|---|---|
| Tank Material | Reinforced PVC coated polyester; TPU coated fabric also available for selected projects | Choose coating chemistry according to liquid contact, folding demand, service environment and compliance requirements. |
| Tank Style | Pillow / bladder, self-supporting onion, frame-supported, aquaculture, custom geometry | Tank structure changes load path, access, footprint and filling behavior. |
| Capacity | Existing DERFLEX reference: approximately 500–500,000 L for flexible bladder products | Large capacities require footprint, filled height, ground loading and seam design review. |
| Fabric Weight | Project discussion commonly spans medium to heavy coated-fabric constructions; 650–1200 gsm is used in existing DERFLEX tank-related product directions | Do not select by GSM alone. Base-fabric density, coating adhesion, tensile and tear strength matter. |
| Thickness | Existing flexible-tank directions include approximately 0.75–1.20 mm; other structures can be discussed | Thickness must be balanced with flexibility, weldability, abrasion resistance and total tank stress. |
| Fabric Reinforcement | High-tenacity polyester base cloth; 1000D-class structures are available in DERFLEX water-containment material lines | Yarn denier and thread density influence tensile, tear and dimensional behavior. |
| Seam Method | High-frequency / RF welding or hot-air welding where appropriate | Weld width and process parameters should be validated on the selected coated fabric. |
| Fittings | Inlet, outlet, air vent, flange, threaded fitting, custom valve location | Fitting reinforcement is a high-stress area and should be designed before fabrication. |
| Groundsheet | Optional / recommended depending on site condition | Ground protection reduces abrasion and puncture risk from stones, concrete edges or debris. |
| Color | Blue, grey, green, orange and custom colors by project | Color can support branding, heat-management strategy and site identification. |
| Temperature Direction | Material systems on DERFLEX tank pages include project directions around -30°C to +70°C | Confirm finished-tank suitability at the actual minimum / maximum temperature and with the stored liquid. |
| Branding / OEM | Custom logo, marking, packing and private-label discussion | Confirm print location and folding method so marks do not interfere with seams or fittings. |
Important: the table is a sourcing framework, not a universal engineering specification. Every finished tank should be approved against the intended liquid, capacity, site and operating conditions.
Hydrostatic load increases as the tank fills. A reliable design therefore depends on the entire material-and-fabrication system, not one headline thickness number.
Do not ask only: “What GSM is this tank?”
Ask instead: What capacity, filled height, base-fabric construction, tensile / tear performance, weld method, fitting reinforcement and ground-protection system is the tank designed around?
This produces a much more useful technical comparison between suppliers.
Existing DERFLEX product images show several containment directions that can be used as visual reference during project discussion.
Capacity is a starting point, not the complete specification. As tank volume rises, filled footprint, height, seam load, valve size, drainage time and ground preparation become increasingly important.
| Capacity Direction | Typical Project Use | What to Confirm |
|---|---|---|
| 500–5,000 L | Small farm supply, backup water, cleaning, field work, compact emergency storage | Portability, valve size, lifting / handling, deployment space. |
| 5,000–20,000 L | Irrigation, construction site water, livestock, temporary process water | Groundsheet, seam layout, filling rate, discharge connection. |
| 20,000–50,000 L | Industrial site supply, emergency reserve, agriculture, remote project storage | Ground loading, access, tank footprint, reinforced fittings and operating cycle. |
| 50,000–100,000 L | Large temporary storage, infrastructure, project reserve, bulk water management | Site engineering, deployment area, drainage planning, heavy-duty fabric construction. |
| 100,000 L+ | Engineered large-volume containment | Project drawing, filled dimensions, substrate, safety margin, handling, site-specific fabrication review. |
Temporary irrigation storage, farm water reserve, livestock water, drought response and remote field supply where transportable capacity is valuable.
Construction-site water, dust suppression, concrete-related operations, remote worksites and temporary utility water where rigid tanks are difficult to mobilize.
Rapid-deployment water reserve for temporary camps, relief operations and disrupted infrastructure. Tank style should match fill speed, hygiene plan and local handling conditions.
Onion tanks and flexible bladders can support temporary fire-water staging. Coupling size, discharge rate, deployment area and local fire-service requirements must be confirmed.
Fish farming, shrimp farming, RAS, hatchery, quarantine and temporary water holding using frame-supported or custom coated-fabric tanks.
Temporary process water, wash water, wastewater and other selected liquids can be evaluated. Chemical compatibility must be confirmed before approving PVC or TPU contact material.
These three structures solve different operating problems. The best choice depends on access, contamination control, deployment speed and how the tank must be supported.
PVC coated polyester is widely used for economical, durable flexible containment and offers good weldability, waterproofing and outdoor performance when the formulation is matched to the application.
TPU coated fabric may be preferred for projects requiring a different flexibility profile, repeated folding behavior, selected water-contact requirements or specialized chemical / abrasion performance.
Neither material should be approved from the material name alone. The stored liquid, contact duration, temperature, cleaning method, required certification and welding process must be reviewed.
View TPU Water Tank FabricDo not assume a standard PVC tank is suitable for every fuel, chemical, fertilizer, solvent, wastewater stream or potable-water requirement.
Tank reliability comes from controlling material, welding, fittings and final inspection as one system.
Confirm liquid, capacity, footprint, operating temperature, deployment cycle, transportation and connection requirements.
Match base-fabric construction, coating type, weight, thickness, surface performance and weldability to the application.
Develop panels, corners, weld overlaps and fitting zones around the filled shape and expected stress path.
Use controlled HF / RF or hot-air welding where appropriate, with reinforcement around high-stress fittings and transitions.
Inspect seams, fitting attachment, surface condition, dimensions and overall workmanship before packing.
Fold and protect the tank to reduce transport damage; match labels, accessories, repair items and documentation to the order.
A heavy duty bladder can still fail if it is placed on an unsuitable surface. The filled liquid creates substantial weight and continuous contact pressure against the ground.
A complete RFQ allows the material and finished-tank specification to be matched faster and reduces unnecessary sampling rounds.
DERFLEX's advantage in this product category is the connection between coated-fabric knowledge and finished-product fabrication. Existing DERFLEX tank pages show in-house PVC coated material supply, high-frequency welding capability and project-based material testing.
Material construction can be discussed from base fabric, coating weight, surface function, thickness and welding behavior instead of treating the tank as a generic finished bag.
DERFLEX supplies both coated-fabric material and custom flexible tank products, supporting buyers that want one source for material matching and fabrication discussion.
Tank capacity, shape, fitting position, color, brand marking, accessories and export packing can be discussed for project and repeat-order programs.
Many heavy duty flexible tanks use reinforced polyester fabric coated with PVC. The polyester reinforcement provides mechanical strength, while the PVC coating provides waterproofness, surface protection and weldability. TPU coated fabric is another option for selected projects. The final material should be selected according to the stored liquid, capacity, operating temperature, folding cycle and compliance requirements.
There is no single best GSM. Higher fabric weight can be useful, but tank reliability also depends on yarn denier, thread density, tensile strength, tear strength, coating adhesion, seam design, tank height, fitting reinforcement and ground condition. DERFLEX uses application-based specification matching rather than approving a tank by GSM alone.
A pillow tank is a closed flexible bladder that expands into a low-profile shape when filled. It is useful when the liquid should remain enclosed. An onion tank is generally self-supporting and open at the top or fitted with a cover, making it fast to deploy, fill and access in the field.
DERFLEX has existing flexible bladder product references from approximately 500 L to 500,000 L. Very large capacities should be treated as engineered projects because tank footprint, filled height, ground loading, seam stress, filling rate and drainage planning become critical.
Yes, coated technical fabrics can be developed for outdoor use. The required UV resistance, temperature range, abrasion protection and expected service cycle should be stated at the quotation stage. Groundsheet use and site preparation are also important for outdoor durability.
Only when the selected material and finished system meet the required potable-water or food-contact standard for the destination market and project. Do not assume that a standard industrial PVC tank is automatically approved for drinking water. Tell DERFLEX the certification and contact requirements before material selection.
Some coated fabrics can be developed for selected industrial liquids, but compatibility must be evaluated case by case. Provide the exact liquid composition, concentration, temperature, contact time and required standard before approval. A generic PVC tank should not be assumed suitable for all chemicals, fuels or solvents.
Depending on the coated fabric and tank structure, high-frequency / RF welding or hot-air welding can be used to create sealed seams. The correct weld width, overlap and process settings should be validated on the selected material, especially around corners and fittings.
A protective groundsheet is strongly recommended whenever the surface may contain stones, sharp edges, rough concrete or abrasive debris. The deployment area should be level, clean and stable before the tank is filled.
Send the stored liquid, required capacity, preferred tank type, available footprint, minimum and maximum temperature, inlet / outlet details, required material or compliance standard, quantity, branding requirements and destination. This allows DERFLEX to recommend a more suitable material and construction direction.
Send DERFLEX your required capacity, liquid type, tank structure, site footprint, valve / fitting details, operating temperature, quantity and destination. We can review PVC or TPU material direction, fabrication details and OEM requirements before quotation.