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Horizontal storage tanks

What is a horizontal storage tank?

A horizontal storage tank is a type of tank that is designed to store liquids horizontally, as opposed to traditional vertical tanks.

Above-ground horizontal cylindrical tanks of up to 150 m³ for the pressureless storage of liquids

KIWA BRL-K796 guideline NEN-EN 12285-2:2005

KIWA BRL-K796 guideline for storage tanks

The KIWA BRL- K796 guideline covers horizontal above-ground single-walled, double-walled and compartment tanks.

Gpi is very experienced in designing and producing single- and double-wall horizontal cylindrical tanks. We can produce these tanks according to the mentioned guidelines.

Additionally, we are KIWA certified for above-ground vertical tanks (KIWA BRL- K756).

Horizontal tanks installed in accordance with the BRL-K796 contribute to the realisation of a negligible soil risk and the prevention of risks for the environment and unusual occurrences.

If this is not possible, we produce these tanks with the goal of limiting risks to the environment and the chance of unusual occurrences.

Key features of a KIWA BRL-K796 tank

The KIWA BRL-K796 tank is known for its quality manufacturing, which uses durable materials like stainless steel. It comes with a lid and outlet for easy access. It is suitable for a wide range of applications.

NEN-EN 12285-2:2005

The BRL-K796 is largely based on the European standard NEN-EN 12285-2:2005. This means that the requirements to be imposed on the tanks and the methods of determination have been laid down here.

Bovengrondse horizontale cilindrische tanks tot 150 m³ voor de drukloze opslag van vloeistoffen
Do you have any questions about our horizontal storage tanks?

The BRL-K796 directive specifies a very concrete tank design, including the following conditions:

  • The storage tank must be fitted with a manhole of at least 600 mm;
  • A double-walled tank shall be provided with a gap over the entire surface of the double wall;
  • The wall thickness of the inner tank, the outer tank, the bottoms, and any compartment bottoms must at least comply with EN 12285-2:2005 and/or BRL-K976-02;
  • Mandatory connections to the tank:
    • Level/water discharge pipe.
    • Extra level/water discharge pipe; mandatory for tanks with a cylindrical length of more than 10 m; diameter min. 1½”.
  • Ventilation; diameter min. 1½” (DN40);
  • In the case of two filling pipes on 1 tank or compartment for discharging the same product, the diameter of the vent must be equal to half the total diameter of the filling pipes.

The complete specification can be read here on the KIWA site.

Under certain conditions, and only in consultation with KIWA, it is possible to deviate from certain conditions if this does not pose a risk to nature and safety.

Read more about our certification and building codes.

Horizontale opslagtank Bovengrondse horizontale cilindrische tanks tot 150 m³ voor de drukloze opslag van vloeistoffen.


  • BRL-K796/02
  • Horizontal unpressurised storage tanks
  • For storage of environmentally hazardous substances
  • Mandatory in a BRL-K903 installation
  • Tanks must at least comply with the requirements in all articles of EN 12285-2:2005 / BRL-K976-02
  • 150 m3
  • Max diameter within EN12285-2 up to 3000 and according to BRL-K976-02 from 3000mm up to 3500mm.


  • Single or double walled
  • Leak detection


The size of a horizontal water tank is usually measured in litres, with common sizes ranging from 400 litres to larger capacities based on your specific requirements.

Horizontal water tanks are ideal for storing and transporting liquids in industries such as agriculture, commercial, and industrial settings.

Yes, Gpi Tanks offers custom tank manufacturing services to tailor the tank to your desired specifications and applications.

Regular cleaning, inspection of fittings, and ensuring proper functioning of pumps or outlets are recommended to prolong the tank’s lifespan and maintain hygiene standards.