Impact of Concrete on Discharge
1. The effects of impact on discharge are considerable.
These are controlled by the vertical form height, the
tank diameter and the method of discharge. Under no
circumstances should concrete be discharged directly
onto the tank.
Loadings
1. If the tank is installed in an area where traffi c or other
superimposed loadings can be applied, consult a
structural engineer for the design of a reinforced concrete
slab to prevent the load being transmitted to the tank
(or its concrete surround). If this slab is constructed
immediately above the tank, it should be separated from
the concrete surrounding the tank by a compressible
material.
Transportation, Unloading and Storage of Tanks
1. Tanks must be held down during transportation using
nylon straps, do not use cables or chains to hold tanks.
2. Do not over tighten straps to cause deformation of the
tank shell.
3. Tanks are best lifted by crane and webbing lifting straps,
do not use chains or wire ropes in contact with the tank.
4. Conder Aqua Solutions recommends the use of a lifting
beam for tanks longer than 8 metres.
5. Smaller tanks may be lifted with other suitable site
equipment but greater care is needed to control the lift
and to ensure the tank is not damaged.
6. Move tanks only by lifting and setting, do not drag or roll.
7. Do not drop or roll tanks from truck.
8. Place tanks carefully onto a smooth level even surface,
free from rocks, large stones or other debris that could
cause point loads.
9. Do not fi ll tanks or ballast with water whilst above
ground, tanks are dependent upon support from
concrete backfi ll to maintain the watertight integrity of
the tank.
10. In high wind conditions, consideration should be given to
strapping down the tanks to prevent damage.
Installation
Installation procedures must be in accordance with the
Health and Safety at Work Act 1974, and other relevant
legislation. Your procedures must also align with good
building practice.
1. Excavate for the tank, allowing suffi cient clearance for
the minimum concrete surround thickness as shown
in the table below, whilst also taking into account
any shoring / trench supports used. The depth of
the excavation is determined by the inlet and outlet
pipe invert levels relative to the bottom of the tank,
and allowing for the minimum base thickness shown.
Dimensioned details of the separator can be taken from
the relevant drawing. Ground instability at formation
level e.g. running sand may necessitate over-excavation
and stabilisation with hardcore or blinding concrete.
NOTE: Check that the depth to the base slab is within
the Service Specifi cation requirements for the tank.
Minimum Concrete Surround Thickness
Tank Diameter (mm)
‘a’ Minimum (mm)
‘b’ Minimum (mm)
1000
150
150
1200
150
150
1500
200
200
1800
250
250
2500
300
300
3000
300
300
4000
350
300
2. Maintain a completely dry excavation until the fi nal pour
of concrete has set. Failure to do this may result in voids
beneath the tank and subsequent tank failure.
3. Pour the concrete into the bottom of the excavation to
form a level and smooth base onto which the tank can
sit. This should be to the minimum thickness given in the
table above.
2 Whitehouse Way, South West Industrial Estate, Peterlee, Co Durham, SR8 2RA UNITED KINGDOM.
+44 (0) 8702 640004 Email: [email protected] www.conderproducts.com
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