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Rainwater
harvesting system installation
Tank Installation procedure
1.
Select a suitable location for the tank – this will be normally in
ground lower than the properties being drained and allow for falls
in site drainage.
2. Check that
no other structure or special access is required over the selected
spot. Provision can always be made, if necessary, to place the tank
on a roadway, provided that protective backfill is placed around it
and a suitable duty manhole cover and frame is used over the
opening.
3. Check that
no underground cables, pipes or service ducts, lie beneath.
4. Evacuate
the minimum opening in the ground to receive the tank and pipe work
to be used. If a machine is used to remove the spoil, the sides of
the excavation should be battened for stability and a sump left in
one corner for dewatering purposes.
5. The depth
of excavation needs to be at most 500mm deeper than the
overall tank (plus extra roof slab if applicable) depth. This extra
depth is required to allow for the construction of a
hardcore/concrete base.
6. A
de-watering pump may be required to control any ground water
present.
7. Some clean
hardcore should be places and consolidated in the base of
excavation. Usually this will need to be about 200mm thick, but in
ground should be a minimum of 50mm.
8. Lay
concrete (minimum grade 25) to a minimum thickness of 150mm on top
of hardcore. Compact well down.
9. Lower the
tank onto the damp concrete base, allowing the base feet/mouldings
to settle in, if applicable. Ensure correct orientation of the
inlet/outlet pipes and other connections.
10. Fill the
tank with approximately 700mm depth of water
Pour
concrete surround in situ to a thickness of approx 100mm and to a
height of 600mm from concrete base using minimum grade 25 concrete.
The concreted must be evenly poured around the tank periphery,
and must not exceed the depth of water in the tank. The
concrete should be vibrated to leave no voids. Care must be taken
to ensure that any pipes (or other connections) made, are not
damaged. Concrete will secure into position any pipes that have
been connected. During concrete pour, ensure that the tank is level
(by use of a spirit level across the tank’s opening). Additionally,
ensure that the tank is at the correct depth level. Allow this
concrete “anchor” to set. Do not remove
the water from the tank.
11. Make
connections of site pipe work, cable duct and vent (if applicable).
12.
Brominator to feed header (break) tank situated in line.
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