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Open flexible tanks - Onion tanks

The open flexible tanks – Opentanks also known as “onion tanks”, type self-supporting tanks, are circular and comprise an inflatable or foam float.

Compared to closed flexible tanks, they allow quickly storing raw or drinking water poured into the opening at the top. They are also quick and easy to clean, to effectively eliminate any pollution of the stored liquid (sludge, leaves, etc.).

These open flexible tanks are generally designed to store raw water dedicated to civil defence or humanitarian needs. This onion tank can however be used for storing industrial effluents or polluted waters.



  • One-off storage
  • Fast pumping/filling


  • Very high resistance coating fabric


  • Foldable and lightweight
  • Fast filling
  • Simple full interior cleaning

Detailed information

  • Material: high resistance 1300 gr/m2 cloth
  • Coating: PVC
  • Technical aspects: high-frequency welding
  • Temperature resistance: -30°C to + 70°C
  • Tailor-made
  • Accessories:
    • One DN50 pipe with direct passage valve and connector + Guillemin system cap, Camlock or others on request
    • One groundsheet

Technical informations

Dimensions (m3) Max. diameter Opening diameter Overall height (mm)
1 1.75 1 600
2 2.20 1.50 750
3 2.55 1.90 850
5 3.05 2.10 1000
10 4.25 3.50 1000
15 5.20 4.70 1000
20 6.05 5.00 1000

You can not find your dimensions

Our design department employs the best project leaders and designers and will be pleased to develop and create a tailor-made product specially for your unique project.


Composition / Advice

Care during use
Avoid any contact with surfaces that are too abrasive or have cutting edges. Never exceed the product’s rated capacity. Refer to the Installation manual.
Maintenance advice
Clean outside parts with clear or soapy water using a soft brush, rince and dry.
Storage advice
Store always in its original box, away from light, humidity and temperature variations.

Standards / regulations

ISO 9001, ISO 140001, ISO 45001


Fact Sheets / Business Guides
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Outlet DN50
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