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.

Available in the following versions

  • Flexibility and stability are perfectly combined
  • No need for heavy load transport on trucks up to the size of 76,000 ltrs
  • Lorry bearing up to 40 t
  • Groundwater-stable
  • Dome opening with stainless steel profile for precision fit and secure mounting
  • Lighter than equal tank made of concrete or steel
  • Numerous DN 100/150/200 connection surfaces
  • Optional DN 300 connection
  • Optional second tank dome
  • Up to 122,000 litres on request

Advantages

Thought-out in every detail

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.

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

Depending on the model, our underground tanks can be partially or fully installed in groundwater. The maximum immersion depth and the required ground cover must be observed in accordance with the technical data.

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.

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.

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.

Free of remediation
Free of remediation
Free of remediation

Due to the constant contact with wastewater, concrete tanks are always at risk of corrosion. Depending on the degree of damage, this can result in expensive renovation of the tank. Plastic tanks are not at risk of corrosion due to their nature.

Lorry-bearing
Lorry-bearing
Lorry-bearing

Including telescopic dome shaft truck for the installation of commercially available cast concrete covers.

360° rotatable tank dome

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

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

Depending on the model, our underground tanks can be partially or fully installed in groundwater. The maximum immersion depth and the required ground cover must be observed in accordance with the technical data.

Optionally with second tank dome

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

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.

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.

Free of remediation

Due to the constant contact with wastewater, concrete tanks are always at risk of corrosion. Depending on the degree of damage, this can result in expensive renovation of the tank. Plastic tanks are not at risk of corrosion due to their nature.

Lorry-bearing

Including telescopic dome shaft truck for the installation of commercially available cast concrete covers.

Sizing

Volume [l]Length [mm]Width [mm]Height [mm]Weight [kg]order no.add to enquiry
16000453025003160830380305
220006200250031601130380329
260007200250031601280380306
320008555250031601400380330
360009525250031601470380331
4200010880250031601740380332
4600011850250031601815380333
5200013205250031602085380334
5600014175250031602160380335
6200015530250031602430380336
6600016500250031602505380337
7200017855250031602775380338
7600018825250031602850380339
8200020180250031603120380350
8600021150250031603195380351
9200022505250031603465380352
9600023475250031603540380353
10200024830250031603810380354

calculated size Request for information

Technical details

Groundwater installation

Earth covering with groundwater installation [mm] 800-2000

Installation

max. earth covering [mm] (without groundwater, vehicle loading) 8

Downloads

Accessory