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H
>H
>500
5.2.1 Slope, embankment, etc.
If installation of the tank is 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.
5.2.2 Groundwater and cohesive (water-impermeable) soils (e.g. clay soil)
If it is anticipated that the tanks will be immersed
deeper into the groundwater than is shown in the
adjacent figure, sufficient dissipation must be
ensured. (See table for max. immersion depth).
Dissipation of the drainage water (e.g. via an
annular drainage system) is recommended in the
case of cohesive, water-impermeable soils.
5.2.3 Installation adjacent to surfaces used
by vehicles
If the underground tanks are installed adjacent to
surfaces which are used by heavy vehicles
weighing over 3.5 tonne the minimum distance
away from these surfaces is at least the depth of
the trench.
5.2.4 Connection of several tanks
When two or more tanks are to be connected
together this is done by joining the tanks together
by using the GRAF Platin Interconnect Tank Seal
(Red) and basic 100mm PVC pipes (to be provided
by the installer at the construction site).
The connecting holes must be pre cut using
“only” the special GRAF 124mm hole saw. The distance
between the tanks must be a minimum 500mm. The pipes must project at least 100mm inside the tanks.
Note: Connected tanks must be ordered with the Pre Drilled Holes and interconnecting tank seal.
Use 40mm pressure pipe (or equivalent approved pipe) for airline between tanks.
5.
>800 <1200
Max.
Max.
1500L -> 700mm / 3000L -> 735mm / 5000L -> 950mm
>700 <1200
