Rainwater Tanks

Pillow type rainwater tanks are designed to collect and store the rainwater. For many different reasons, the users want to collect the store the rainwater. Then, reuse the rainwater for irrigation, fire-fighting, municipal water, or even drinking water. Rainwater tanks provide one great collection and storing system solution that are cost-effective and can work for you. Pillow rainwater tanks are low profile while filled. So it can be put in most of the places.

Normally, the fabric used to construct the pillow tanks are non-potable grade. If you will be using the rainwater for drinking water purposes, we also can make these pillow rainwater tanks with NSF certificated material.

Rainwater Tanks Construction

Please refer below general drawing for the small, middle and large rainwater pillow tanks.

water storage bladders

Inlet Fittings: The standard filling fitting is 2”, 3” and 4” high quality PP flange with cam-lock with one safety cap (refer below picture). The other material filling port and camlock are available upon request. We can do aluminum or stainless steel flange and cam-lock, with stainless steel or brass ball valves.
Outlet Fittings: The standard filling fitting is 2”, 3” and 4” high quality PP flange with cam-lock with one safety cap (refer below picture). The other material filling port and camlock are available upon request. We can do aluminum or stainless steel flange and cam-lock, with stainless steel or brass ball valves.
Optional: Groundsheet can protect your rainwater tanks. It will be supplied upon request.

Fill/Discharge Valve (2” or 3”) Drain Valve (2” or 3”) Air Bleed

Rainwater Pillow Tanks Specification

DOOWIN rainwater storage pillow tanks are from 200L to 800,000L. Below you will find our standard specification of rainwater tanks. Customized size and shape are available upon request. If you have any special request, please contact us now.

water-bladder-tanks-size
The above size in only for reference. We may change it without notice.

Customized Size Available Upon Request. Call Us +86-18554869267 !

Advantages and Features of Rainwater Tanks

DOOWIN rainwater bladders are produced by HF welding technology for better performance. Don’t use glue or hot-air. There are features and advantages to ensure rainwater tanks it is the best container bladder for collection and storage of rainwater.

Low profile when filled
Flat when empty
UV resistant, oil resistant
Top notch UV resistance
Excellent abrasion properties
Light weight, High strength
Easy to storage and shipment
Easy to setup and operate
Wide range of use
Wide range capacities up to 800 m³
Customized shape and size available
Various filling/discharge fittings
Can be used for potable drinking water tanks
Fabric meet NSF 61 requirements

Innovative HF Welding Technology

DOOWIN pillow tanks use HF welding technology. The HF welding seams have better tensile strength than the hot-air welding seams. It has more stable performance, not easy to separate for long term storage.

Traditional Hot-Air Welding Technology

We abandon the traditional hot-air welding technology. The hot-air welding seams are not persistent. The seam is easy to seperate. Some inferior bladders prefer this welding.

Rainwater Pillow Tanks Material

Normally, the fabric used to construct the pillow tanks are non-potable grade. If you will be using the rainwater for drinking water purposes, we also can make these pillow rainwater tanks with NSF certificated material.

PVC Coating Fabric Material: This material is the same as the Non-Potable Water Bladders Material. DOOWIN use the top grade fabric for these non-potable water bladders.

Our rainwater tanks are made of extremely robust flexible fabric material. These fabrics have high-strength polyester base fabric and special inner coating. It has super high UV resistant or oil resistant. It cannot be cracked after long time use.
Potable Water Pillow Tanks Material: This material is the same with our potable water tank’s material. We have to ensure the quality of the drinking water that stored in our pillow tanks cannot be affected by contact with other material.

DOOWIN use the top grade fabric for the drinking water storage tank made in Germany. These fabric material are certificated with the American NSF/ANSI 61, KTW, ACS or FDA standards.. So you can be assured that our portable water tank does not pose any risk of contamination to drinking water.

>> Check our NSF certificate.

Material Thickness: 0.6 ~ 1.4mm; Weight: 900g ~ 1800g/m2; Strength: 4000N ~ 10,000N/5cm

Standard Color: Beige

Please choose the NSF certificated material !

Important Notice: Please don’t always focus on the strength and thickness of fabric material. It is only is one side of good material. The most important point is the PVC/TPU coating formula. It can ensure the material has the best UV resistance, oil resistance, abrasion resistance, fire resistance, and other performance.

Rainwater Pillow Tanks Application

We can make the collapsible rainwater tanks for below application but not limited to. In one word, if you want to store rain water, choose DOOWIN rain-water pillow tanks.

Cistern
Collection rainwater
Rainwater storage
Garden irrigation
Storage rainwater for re-use

FAQ

Is it suitable for drinking water?

Certificated quality for drinking water. Our fabric material is certificated comply with NSF/ANSI 61 drinking water standard. No taste or odor. Suitable for long-term storage potable drinking water.

What kind of material do you use?

Refer above introduction. We commonly use the SGS certifiated PVC or TPU coating fabric material. We also use the top quality fabric material for drinking water, which is NSF/ANSI 61 certificated. For the details material performance, please feel free to contact us.