DERFLEX manufactures PVC water bladder tanks from reinforced PVC coated polyester for portable, temporary and bulk water storage. Capacity, filled dimensions, fabric thickness, HF-welded seam design, valve layout, color, branding and accessories can be customized for agriculture, construction, emergency response and selected industrial water applications.
Unlike a rigid tank, the bladder folds flat or into a compact package when empty and expands as it fills. The reinforced textile carries mechanical load, while the PVC coating provides the waterproof and weldable surface. Most buying decisions should therefore consider tank geometry, fabric construction, seam design, valve reinforcement, ground protection and the actual stored medium together.
A water bladder is especially useful where a permanent rigid tank is unnecessary, difficult to transport or too bulky to store between projects.
Bladder geometry changes filled height, ground footprint, seam stress and how the tank behaves during filling. Choose shape before finalizing material thickness.
The classic closed flexible bladder. It expands into a low-profile pillow form and is widely used for temporary bulk water storage.
A more controlled footprint for applications where floor space, truck-bed area or container dimensions must be considered before fabrication.
Flexible bladders can support remote water transport on suitable vehicle platforms. Restraint, load movement, road conditions and local transport requirements must be reviewed separately.
Smaller capacity units can support service crews, agriculture, maintenance work and emergency kits where storage space is limited.
Higher-capacity bladders are used for temporary reserve and project water, but require more detailed review of filled dimensions, site loading, valve flow and seam stress.
DERFLEX can discuss non-standard dimensions, connection layout, branding and packing for distributors, contractors and repeat project procurement.
Capacity is only the first number. The same volume can be built with different length, width and filled-height relationships, which changes footprint, seam loading and handling.
| Capacity Direction | Typical Use | Selection Focus |
|---|---|---|
| 100–1,000 L | Portable service water, maintenance, small farm use, vehicle-supported applications | Handling weight, connection size, compact packing and available platform space. |
| 1,000–5,000 L | Agriculture, construction, irrigation, temporary site water | Footprint, groundsheet, valve size, fill / drain rate and deployment frequency. |
| 5,000–20,000 L | Bulk irrigation water, construction reserve, emergency and remote projects | Seam design, fitting reinforcement, substrate preparation and hose support. |
| 20,000–50,000 L | Large temporary site water, infrastructure and industrial water reserve | Ground loading, controlled filling, connection flow and safe drainage planning. |
| 50,000 L+ | Engineered bulk water storage | Project drawing, filled dimensions, site engineering, seam loading and operating procedure. |
DERFLEX legacy flexible-bladder references include very broad capacity ranges. For larger projects, use the quotation / technical drawing as the controlling specification rather than assuming every historical maximum applies to every bladder geometry.
A water bladder is only as reliable as the relationship between coated fabric, seam design and fitting reinforcement.
DERFLEX publishes a 2 m3 flexible bladder example with:
Use this as a product reference—not as a universal specification for every capacity.
Valve positions should be decided before cutting and welding. A generic inlet / outlet layout can create difficult filling, incomplete drainage or unnecessary hose stress.
Temporary irrigation reserve, livestock water, remote field supply and seasonal storage where the empty tank must pack down between uses.
Site water, dust suppression, wash-down, concrete-related operations and temporary water reserve for remote projects.
Rapid-deployment reserve for disrupted infrastructure, relief operations and temporary camps. Required water-contact standards should be specified in advance.
Remote-service and transport applications where compact empty volume is valuable. Vehicle restraint and transport safety require separate engineering review.
Process water, wash water and temporary utility-water storage can be evaluated according to site conditions and material requirements.
Some temporary wastewater applications may be possible, but liquid compatibility, temperature, pH and cleaning method must be confirmed before approval.
Once filled, the bladder presses continuously against the supporting surface. Sharp debris and rough concrete can damage even reinforced material.
The old DERFLEX page listed many food and industrial liquids broadly. The safer procurement approach is to approve the exact coated fabric and fittings for the actual liquid and compliance requirement.
A complete RFQ allows DERFLEX to recommend the bladder geometry, PVC construction and valve configuration before final pricing.
DERFLEX supplies PVC coated technical fabric and finished flexible containment products, supporting material-to-product specification discussions.
Existing DERFLEX water bladder references document high-frequency welded PVC construction, giving buyers a concrete fabrication route to discuss.
Capacity, footprint, valves, color, logo, accessories and packing can be discussed for distributors and project buyers rather than relying on one stock bladder.
A PVC water bladder is a closed flexible storage tank made from reinforced PVC coated fabric. It folds compactly when empty and expands as it fills, making it suitable for portable and temporary water storage.
“Flexible water tank” is the wider category. A PVC water bladder is a specific closed tank format within that category, typically made from PVC coated reinforced textile and welded into a pillow or rectangular shape.
PVC coated fabrics can be joined using high-frequency / RF welding when the material construction is compatible. DERFLEX publishes a 2 m3 bladder example made from 0.9 mm double-sided PVC coated material using high-frequency welding.
Flexible bladder capacities can range from compact portable units to large bulk-storage systems. The practical maximum for a project depends on tank geometry, filled height, site footprint, material construction, seam loading, valve flow and ground conditions.
Yes. Send the required usable volume and maximum available length, width and filled height. DERFLEX can discuss a suitable bladder geometry and connection layout for the available space.
Inlet, outlet, vent, threaded fittings, flanges and hose / pump couplings can be selected according to the filling and discharge system. Fitting zones should be reinforced because hose weight and flow can create local stress.
Yes, appropriate PVC coated fabric can be used outdoors. UV exposure, temperature, ground condition, expected service cycle and protective groundsheet should be specified when choosing the material and bladder construction.
Only when the selected PVC material, fittings and finished bladder meet the required potable-water or food-contact standard for the destination market. Do not assume that every industrial PVC bladder is drinking-water approved.
Compatibility must be evaluated for the exact chemical or fuel. Provide composition, concentration, pH, temperature and contact duration. A standard PVC water bladder should not be assumed suitable for every solvent, fuel or chemical.
A groundsheet or suitable protective layer is strongly recommended whenever the surface is rough, abrasive or may contain stones, metal fragments or sharp debris. The site should be level and stable before filling.
Send the stored water / liquid, required capacity, maximum footprint, preferred shape, temperature, valve / connection details, site surface, deployment cycle, quantity, OEM requirements and delivery destination.
Send DERFLEX your required capacity, filled footprint, stored water / liquid, operating temperature, valve layout, ground condition, quantity and OEM requirements. We can review the PVC fabric construction, HF-welded bladder design and connection configuration before quotation.