2.3.7 Constructing ground
frost isolation
• Isolate both the treatment
plant and the inlet, outlet and
overfl ow pipes.
• Insulation thickness min
50mm and width 1,200mm.
• Install the insulation plates
on the sides of the treatment
plant, slanting outward from
the plant.
• The treatment plant is entirely
insulated to ground level.
2.3.8 Filling and locking
A er installation, the trench is
fi lled up and the ground is shaped
so it is slanted away from the treat-
ment plant. The supplied interim
covers are installed on top of the
storage and process tanks. The
treatment plant cover is closed by
pulling the chain at an angle to the
le . The treatment plant must be
kept locked.
12
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