The Carat XXL underground tank has been specially developed for rainwater harvesting and for use as a retention cistern, firefighting water tank, process water tank and septic tank. It is available in sizes from 16,000 to 122,000 l. Suitable for vehicle loading / lorry loading.

  • Flexibility and stability are perfectly combined
  • Suitable for vehicle loading / lorry loading
  • Dome opening with stainless steel profile for precision fit and secure mounting
  • No need for heavy load transport on trucks up to the size of 76,000 ltrs
  • Secure investment thanks to the market leading 15-year warranty!
  • Lorry bearing up to 40 t
  • Groundwater-stable
  • Lighter than equal tank made of concrete or steel
  • Numerous DN 100/150/200 connection surfaces
  • Optional DN 300 connection
  • Optional second tank dome

Advantages

Thought-out in every detail

Low weight
Low weight
Low weight

Tank installation made easy! The significantly lower weight of GRAF products compared to steel or concrete cisterns makes transport and installation easier.

Groundwater stable
Groundwater stable
Groundwater stable

The tank can be partially or completely installed in groundwater. Please note the maximum immersion depths and necessary ground covers in the technical data.

360° rotatable tank dome
360° rotatable tank dome
360° rotatable tank dome

Allows easy alignment to the connecting pipes. A tank that turns it`s head for you.

Telescopic/Tiltable
Telescopic/Tiltable
Telescopic/Tiltable

The telescopic dome shafts are height-adjustable and can be tilted by 5 degrees. This makes it easy to adapt to the upper edge of the terrain.

Optionally with second tank dome
Optionally with second tank dome
Optionally with second tank dome

The GRAF XXL tank can optionally be equipped with a second tank dome.

Sealed to the top edge of the ground
Sealed to the top edge of the ground
Sealed to the top edge of the ground

The ingress of seepage water can impair the water quality. Our tank and filter solutions are therefore sealed up to the top edge of the ground.

Ready for connection
Ready for connection
Ready for connection

With GARANTIA tank systems, the connection seals are already pre-drilled and lip seals are pre-assembled. This saves time and therefore costs during installation.

Dome opening with stainless steel profile
Dome opening with stainless steel profile
Dome opening with stainless steel profile

Dome opening with stainless steel profile for high fitting accuracy and mounting safety.

Individual connections possible
Individual connections possible
Individual connections possible

Flexible connections possible according to customer requirements on the tank dome up to DN 300 or on the end face up to DN 300.

Low weight

Tank installation made easy! The significantly lower weight of GRAF products compared to steel or concrete cisterns makes transport and installation easier.

Groundwater stable

The tank can be partially or completely installed in groundwater. Please note the maximum immersion depths and necessary ground covers in the technical data.

360° rotatable tank dome

Allows easy alignment to the connecting pipes. A tank that turns it`s head for you.

Telescopic/Tiltable

The telescopic dome shafts are height-adjustable and can be tilted by 5 degrees. This makes it easy to adapt to the upper edge of the terrain.

Optionally with second tank dome

The GRAF XXL tank can optionally be equipped with a second tank dome.

Sealed to the top edge of the ground

The ingress of seepage water can impair the water quality. Our tank and filter solutions are therefore sealed up to the top edge of the ground.

Ready for connection

With GARANTIA tank systems, the connection seals are already pre-drilled and lip seals are pre-assembled. This saves time and therefore costs during installation.

Dome opening with stainless steel profile

Dome opening with stainless steel profile for high fitting accuracy and mounting safety.

Individual connections possible

Flexible connections possible according to customer requirements on the tank dome up to DN 300 or on the end face up to DN 300.

Sizing

Volume [l]Length [mm]Width [mm]Height [mm]Weight [kg]order no.add to enquiry
16000459025003160770380001
220006230250031601025380000
260007200250031601125380002
320008440250031601405380003
360009410250031601500380004
4200010680250031601795380005
4600011650250031601890380006
5200012920250031602185380007

calculated size Request for information

Technical details

Accessibility

Earth covering with loading capacity [mm] 800 - 1500
max. axle load [t] 13.5
max. vehicle weight [t] 40
max. vehicle weight with reinforced concrete slab [t] 60

Groundwater installation

Earth covering with groundwater installation [mm] 800 - 1500

Installation

max. earth covering [mm] (without groundwater, vehicle loading) 1500

Accessory