Premier Tech Aqua Conder CNSB Instruction sheet

General
1. These guidance notes refer only to the installation of
Concrete surround CNSB Bypass Separators.
2. Manufactured to BS EN 858 Class 1 and Class 2.
3. These guidance notes cannot provide specic, site-
related installation instructions.
4. If in any doubt whatsoever about any aspect of the
installation please contact Conder Aqua Solutions on
0870 264 0004.
Pre-Installation Inspection
1. The lter pod in these tanks is held in place during
transportation by means of a Transit Brace. This is to
hold the lter pod in place during transportation and
ensure the separator is delivered to site in the same
A1 condition as it left our manufacturing facility. THIS
MUST BE REMOVED PRIOR TO INSTALLATION. Failure
to remove the brace may prevent access to the pod for
maintenance and WILL RENDER THE WARRANTY ON
THE TANK INVALID.
2. The timber transit brace consists of a vertical brace
holding the lter pod in place and a horizontal restraining
bar. To remove the brace, unscrew the horizontal
restraining bar and remove both pieces of timber.
3. Tanks should be subject to a visual inspection prior to
installation
4. Check the tank is the correct size and duty, see label on
tank
5. Any damage should be notied to the delivery driver and
to Conder Aqua Solutions on 0870 264 0004.
6. Do not attempt to carry out any unauthorised repairs, as
this will invalidate the warranty on the tank.
7. Check for:
- Fractures to the shell or ribs
- Delaminations
- Scratches or abrasions deeper than 1.5mm
- Stress cracks or star crazing
8. Check invert depth is correct and inlet and outlet pipe
orientations are correct
9. REMOVE TANK FROM PALLET
Service Specication
1. These tanks are designed to be installed below ground
and completely surrounded with concrete.
2. Generally, the depth from nished ground level to the
top crown of the main shell should be no more than 2
metres, this may vary dependent upon ground water
conditions. Deeper inverts may be accommodated on a
standard shell providing the water table level does not
exceed 2 metres above the top crown of the main shell.
For deeper burial with high water table conditions heavy
duty shells are available. Should you be in any doubt
regarding suitable shell application please call our sales
number 0870 2640004. If the tank is installed outside
these parameters it may suffer irreparable damage.
Concrete Specication
1. The specication for the concrete mix to surround the
tank may be taken from BS 5328: Part 1: 1991 (including
amendments), taking into account the site conditions and
application requirements.
2. For a typical non-structural application in non-
aggressive soils a Standard Mix ST4 with a 50mm slump
is generally suitable, but also permits the equivalent
Designated Mix GEN3 to be specied as an alternative.
If for non-typical applications, structural or other reasons
a higher than normal designation is required, the
purchaser of the fresh concrete can use table 6 in BS
5328: Part 2: 1991 (amendment 8759/October 1995) for
guidance.
Lift height (Rate of Rise)
1. Determine the lift height (m), or rate of rise (m/h) for
the specic concrete type used, to ensure that a
design pressure (P max) of 15kN/m on the tank is not
exceeded.
Vibration
1. The design of the tank assumes minimal compaction of
the surrounding concrete. Where necessary, this may
be extended to include light internal vibration. Never
use deep revibration which will substantially increase the
pressure on the tank, possibly causing failure.
Conder CNSB Bypass Separator: Concrete Surround
Conder Installation Guidelines Ref: UTG9503
2 Whitehouse Way, South West Industrial Estate, Peterlee, Co Durham, SR8 2RA UNITED KINGDOM.
[phone] Email: [e-mail] www.conderproducts.com
THE PARTNER OF CHOICE
Page 1
Revision No. 4

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 traf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 ll tanks or ballast with water whilst above
ground, tanks are dependent upon support from
concrete back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 suf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 Specification 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 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.
[phone] Email: [e-mail] www.conderproducts.com
THE PARTNER OF CHOICE
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

4. Place the tank onto the concrete base, while the concrete
is still wet, and determine the correct orientation for the
tank inlet(s) and outlet(s), i.e. the higher pipe on the tank
is to be connected to your upstream (inlet) pipework, and
the lower pipe on the tank is to be connected to your
downstream (outlet) pipework. Connect and seal your
pipework to the tank, checking alignment, and ensure
that there is an adequate and correct fall for each pipe.
5. Fill the separator with clean water to a depth of 300mm
and recheck the pipework levels. Commence backlling
evenly around the tank with concrete ensuring there are
no voids, particularly at the bottom of the tank shell.
Continue lling the chambers with water whilst evenly
backlling with concrete ensuring that the progressive
water level is no more than 300mm above the concrete
level.
6. Connect and seal any turret extensions prior to
completing the concrete encasement of the main tank to
the height shown in the table. Allow this concrete to set.
7. Using appropriate formwork, continue pouring concrete
around the tank superstructure (i.e. bypass chamber,
access turrets) in lift heights not exceeding 500mm,
allowing initial set between each lift. Never increase the
lift height or accelerate the rate of rise for the concrete
type used, or allow the concrete to be compacted
to an extent which will cause any part of the tank
superstructure to distort. If you contravene this warning
you will cause damage to the tank.
8. Complete backll to ground level using free owing
material. Trim all access turrets and prepare suitable
footings for each manhole frame ensuring that any loads
on the covers are not transmitted to the tank access
turrets or access extensions, if tted.
Control of Groundwater
1. Tanks must not be subjected to buoyant forces during
installation, taking account of ground water levels and
surface water run-off, and their accumulation in the tank
pit, even if tanks are anchored.
2. The excavation should be maintained dry by pumping or
whatever suitable means until the concrete surround is
cured.
Access Shaft Extensions
1. Access extensions shall be surrounded with concrete
poured in 500mm lifts allowing initial set between each
lift. The pressure from concrete placed in higher lifts
may cause access extensions to distort or collapse.
2. Please note that loose shafts should be sealed using
silicon sealant sikaex –291 or similar prior to installation
to prevent ingress of groundwater under high water table
conditions. It is the contractors’ responsibility to ensure a
watertight seal.
2 Whitehouse Way, South West Industrial Estate, Peterlee, Co Durham, SR8 2RA UNITED KINGDOM.
[phone] Email: [e-mail] www.conderproducts.com
THE PARTNER OF CHOICE
Page 3