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Hydrostar Onion Tank Specifications

The HydroStar Onion Tank (also referred to as a blivet or pumpkin tank) by GEI Works is a dependable, durable, and portable open-top water storage tank which is suitable for use in emergency response. Additionally, onion tanks provide containment for water, or retention of hazardous or sensitive materials. *Depending on your chemicals and liquid storage requirements, we may require customers to provide us with an SDS (Safety Data Sheet) to help confirm compatibility with the chemicals you will be storing in the onion tank.

HydroStar Onion Tanks are designed with functionality, storage, and transportation in mind. Similar to other dump tanks, they fold into a compact, easy to move bundle and can be easily and safely deployed by one person when needed.

HydroStar Onion Tanks are manufactured with a floating foam collar at the top which maintains the integrity of the tank's shape as it is filled. Fitted into the flexible wall of the tank is a two inch bulkhead valve with a plug that allows for quick draining of the onion tank, or for hooking up an additional filling location. As a result of the tank's design, it will self-rise and self-support as liquid fills the interior. The tank material is commonly made from vinyl, urethane or NSF 61 approved materials. Additionally, the fabric used is crafted with extended durability, UV resistance, and outdoor conditions in mind.

Not all fabrics are suitable for all uses. Please let us know how you plan to use your onion tank so we can make sure it's constructed with the right fabric and coating for your specific needs. Please contact us to discuss any questions about onion tank lining or your requirements.

Need an onion tank? Call 772-646-0597 or request a quote.

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HydroStar Onion Tanks can be found in, but are not limited to, the following applications:

  • Fire Fighting
  • Emergency Response
  • Military Logistics and Liquid Containment
  • Storage of Recovered Oil
  • Agricultural Liquid Storage
  • Hazardous Material (HAZMAT) Storage* (SDS)

HydroStar Onion Tanks from GEI Works are available in a wide array of sizes in volumes ranging from 250 to 10,000 gallons of liquid storage (custom tank sizes are available on request), with choice of low sided and high sided containers. See below for product specifications on our standard models:

Low Side Onion Water Tank Specifications

Capacity (Gal) Capacity (Ltr) Base Diameter Filled Height
250 Gallons 946 L 5'10" (1.8 m) 28" (0.7 m)
500 Gallons 1,893 L 7' (2.1 m) 32" (0.8 m)
750 Gallons 2,839 L 8'4" (2.5 m) 33" (0.8 m)
1,000 Gallons 3,785 L 9'5" (2.9 m) 33" (0.8 m)
1,500 Gallons 5,678 L 11'9" (3.6 m) 32" (0.8 m)
2,000 Gallons 7,570 L 13' (3.9 m) 32" (0.8 m)
2,500 Gallons 9,463 L 14'3" (4.4 m) 32" (0.8 m)
3,000 Gallons 11,355 L 15'3" (4.8 m) 34" (0.9 m)
5,000 Gallons 18,927 L 18'2" (5.5 m) 33" (0.8 m)
6,000 Gallons 22,712 L 21'6" (6.6 m) 33" (0.8 m)
10,000 Gallons 37,854 L 26'9" (8.2 m) 33" (0.8 m)

High Side Onion Water Tank Specifications

Capacity (Gal) Capacity (Ltr) Base Diameter Filled Height
500 Gallons 1,893 L 5' (1.5 m) 36" (0.9 m)
1,000 Gallons 3,785 L 8' (2.4 m) 44" (1.1 m)
1,600 Gallons 6,056 L 9' (2.7 m) 44" (1.1 m)
1,800 Gallons 6,813 L 9' (2.7 m) 46"(1.2 m)
2,000 Gallons 7,570 L 11'9" (3.6 m) 48"(1.2 m)
2,500 Gallons 9,463 L 12'8" (3.9 m) 48" (1.2 m)
3,000 Gallons 11,355 L 14'2" (4.3 m) 48" (1.2 m)
5,000 Gallons 18,927 L 16'2" (4.9 m) 60" (1.5 m)
6,000 Gallons 22,712 L 16'2" (4.9 m) 65" (1.7 m)
8,000 Gallons 30,283 L 19'5" (5.9 m) 65" (1.7 m)
10,000 Gallons 37,854 L 19' (5.8 m) 80" (2 m)

*Fittings are 2" bulkhead with plug

HydroStar Onion Tank Accessories

  • Top covers for protection from debris or aquatic insects
  • Underlayment to protect the underside of the tank
  • Ball valves to replace worn or damaged connector
  • Hose for filling/draining the tank
  • Repair kit to patch any damages sustained to tank fabric

For more information, please visit our Hydrostar Onion Tank Overview or our Hydrostar Onion Tank Emergency Response page.

Questions? Call our team at: 772-646-0597.

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