25
10.5.2 Installing onto the base/plinth:
•
Mechanically lift the plant carefully into the centre of the hole before the concrete sets.
•
The tank must be dead level on the plinth.
•
Connect and seal the pipe work to the tank appropriately.
10.5.3 Backfilling a wet site:
Refer to backfill specification appropriate for site conditions
•
Ballast* the plant by filling each chamber with clean water to a depth of 300mm and recheck the
pipe work levels. Commence backfilling evenly around the tank ensuring that there are no voids.
Continue filling the chambers whilst backfilling, ensure that the progressive water level is no
more than 300mm above the backfill level.
•
Backfill with concrete until it has reached the invert of the outlet pipe.
•
Continue backfilling with gravel as per 10.6.1 until has reached 50mm over the cylindrical body
of the tank.
•
Mount and seal manhole extensions (if used)
•
Complete backfilling with topsoil up to the max ground level line.
* Ballasting the plant is important to avoid the tank from lifting when backfilling.
10.6 Plinth and Backfill specifications:
10.6.1 Gravel backfill specification:
Primary backfill specification:
Primary backfill material should be free-flowing granular material. Compaction should be by lightweight
rollers or vibratory plate compactor until “traffic” depth has been achieved. Compact gravel evenly to
ensure tank is properly supported. Ensure the vibrating machine does not come in contact with the shell
of the tank. Tanks must be installed with primary backfill only within the region immediately surrounding
the tanks. This primary backfill must extend a minimum of 250mm outward from the tank, and directly
beneath the tank.
Summary of Contents for NOVO EN6-50
Page 1: ...Technical Installation Manual Tricel Wastewater treatment systems TTM T106 Rev 06 Nov 13...
Page 11: ...11 Tricel Novo UK12 gravity plant Tricel Novo UK18 gravity plant...
Page 13: ...13 Tricel NovoUK42 gravity plant 2 tank plant...
Page 14: ...14 Tricel Novo UK50 gravity plant 2 tank plant Example of stepped installation...
Page 39: ...39...