NO CONCRETE WORKS ARE REQUIRED for Oasis Tanks under 350,000 litres. Tanks in excess of 350,000 litres require only a simple concrete ring beam upon which the tank is installed.
are installed directly onto the ground, onto a levelled sand pad. Proper and careful preparation of the site and sand pad is essential to ensure long and trouble-free service from your Oasis tank in years to come. This is a simple exercise that can be easily undertaken either by you or by an accredited Oasis Tanks installer.
Select a site on flat, level ground that is stable. Where possible, position the tank on natural (undisturbed) ground, rather than on reconstituted (disturbed) ground or earth-fill.
Excavate the site:
Remove all sharp rocks, debris or roots. Where necessary, take action to prevent root re-growth or termitarium growth.
NOTE. When fill-material has been used to level the site:
Provide sufficient drainage:
SAND PAD INSTALLATION
The sand pad forms the protective layer upon which the liner rests. Sand pad material should be free-draining, sieved pit or plaster sand, and free of sharp objects or debris.
Order the required amounts of sand pad material AND 19mm aggregate for delivery on site (see calculations below).
In the event that a contractor is required to perform the site preparation, position the required volume of sand pad material directly adjacent to the tank’s proposed installation site.
Install a bed of 19mm crushed rock aggregate, 1000mm wide x 100mm thick, around the entire circumference of the tank on the exposed sand pad, to protect the sand pad material from wind or water erosion.
NOTE: Please arrange for the aggregate to be delivered to site at the same time as the sand pad material. This will enable the protective aggregate bed to be installed immediately after the tank installation has been completed.
The Oasis Tanks Product Warranty is subject to the site preparation being performed strictly in accordance with the instructions provided above.
EXAMPLE: the volume of sand required for aggregate around a 6.6m diameter tank:
A. Calculate the tank footprint area i.e. 6.6m diam. (pi x r²) 3.14159 x 3.3 x 3.3 = 34.2m²
B. Calculate the area of the sand pad footprint i.e. 8.6m diam. 3.14159 x 4.3 x 4.3 = 58.0m²
C. C = Area of the aggregate footprint: B minus A = C 58m² – 34.2m² = 23.8m²
D. Volume (100mm deep) aggregate required: C x 0.1m 23.8m² x 0.1m = 2.38m³ (order 2.5m³)
Order 2.5m³ (rounded off) of aggregate
EXAMPLE: the volume of sand required for the sand pad of a 6.6m diameter tank:
Diameter: 6.6m + 2m = 8.6m See 2.a. above
Radius (r): 8.6m/2 = 4.3m
Depth of sand: 150mm (0.150m) See 2.b. above
Volume (m³) sand required = pi (3,14159) x (radius of sand pad)² x depth of sand (m)
3.14159 x (4.3 x 4.3) x 0.150m = 8.7m
Order 9m³ (rounded off) of sand