2700 Litre GRAF Underground Water Tank
SKU: 10.0025
Dimensions: 2080L x 1565W x 2010H
Tank Weight: 120KG
- 2700 Litre / 713 Gallon Capacity
- Optimal tank geometry and statics due to CAD product development – equals highest stability
- Unique fitting accuracy of the components
- Dome opening with stainless steel profile for precision fit and secure mounting
- Consistent quality due to constant production monitoring
- Vehicle or lorry-bearing (combined with Telescopic dome shaft with cast iron lid or TRUCK)
- Groundwater stable up to the middle of the tank thanks to extremely stable construction
- Can be expanded as required
- Easy installation due to low net weight
- The tank can also be used as a rainwater collection tank after cleaning
- 15 years warranty
- Larger connection fittings available on request.
**CARAT UNDERGROUND WATER TANKS ARE NOT SUITABLE FOR DRINKING WATER**
Shaft & Lids
Telescopic Shaft and Lid (Standard)
This standard shaft and lid is specifically designed for non-vehicle loading which makes it ideal for general garden use. The shaft can be adjusted from 140mm to 340mm and tilted up to 5º to make installation to finished ground level easy. Includes a tough, long lasting child proof
lockable PE lid. Maximum load weight: 150kg
Telescopic Shaft and Lid (Heavy Duty Class B or D)
Designed specifically to cope with the weight of passenger vehicles, this shaft can be adjusted from 140mm – 440mm and tilted up to 5º to sit flush with the ground level. Includes a child safe cast iron lid. Maximum weight: 3.5 tonnes Gross Vehicle Mass
Installation & Assembly
Construction site
Under all circumstances, the following points must be clarified prior to installation:
- The structural suitability of the ground according to DIN 18196
- Maximum groundwater levels which occur and drainage capability of the subsoil
- Types of load which occur, e.g. traffic loads
An expert ground report should be requested from the local planning authority to determine the physical
characteristics of the subsoil.
Trench
To ensure that sufficient space is available for working, the base area of the trench must exceed the dimensions of the tank by 500 mm on each side; the distance from solid constructions must be at least 1000 mm.
The embankment must be designed according to DIN 4124. The construction site must be horizontal and plane and must guarantee sufficient load-bearing capacity.
The depth of the trench must be dimensioned so that the max. earth coverage (see point 2 – installation conditions) above the tank is not exceeded. To use the system throughout the entire year, it is necessary to install the tank and those parts of the system which conduct water in the frost-free area. The frost-free depth is usually approx. 600 mm – 800 mm; precise information in this regard can be obtained from the
responsible authority.
A layer of compacted, round-grain gravel (grain size 8/16, thickness approx. 150 – 200 mm) is applied as the foundation.
Slope, embankment, etc.
On installation of the tank in the immediate vicinity (< 5 m) of a slope, earthen mound or slope, a statically calculated supporting wall must be erected to absorb the soil pressure. The wall must exceed the dimensions of the tank by at least 500 mm in all directions, and must be located at least 1000 mm away from the tank.
Groundwater and cohesive (water-impermeable) soils (e.g. clay soil)
With only occasional ground water and cohesive, water impermeable soils (e.g. loam), adequate drainage of the ground water or leakage water must be ensured so that the tanks never stand deeper in the ground water than indicated in the table. If necessary, the drainage line must end in a vertical DN 315 pipe in which an immersion pressure pump is installed to pump off the excessive water. The pump must be checked at regular intervals. If it is to be expected that the tanks could sink lower, adequate drainage must be ensured in all cases. We recommend the general laying of a drainage line, since in the event of prolonged rainfall the ground water level can rise unexpectedly.
Installation adjacent to surfaces used by vehicles
If the underground tanks are installed adjacent to surfaces which are used by heavy vehicles weighing over 12 t, the minimum distance away from these surfaces is at least the depth of the trench.
