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Pre-Installation Inspection
Before installation an inspection of the chamber must be carried out to ensure no damage has
occurred since delivery and to check all inlet and outlet connections are correct.
Any changes or repairs cannot be made once installation has begun.
Tank Installation
•
Select a suitable location for the tank. This will be normally at ground level lower than the
properties being drained and allow for the falls in site drainage
•
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 in a roadway, provided that a suitable protective
backfill is placed around it and a suitable heavy-duty manhole cover is used over the opening
•
Check that no underground cable, pipe or service duct, lies underneath
•
Excavate the minimum opening in the ground to receive the pump chamber and pipework to be
used. The depth of excavation needs to be at most, 500mm deeper than the overall tank depth,
the sides of the excavation should be shored up for stability. A sump should be left in one corner
for dewatering purposes
•
A dewatering pump MUST be used in the sump to remove any ground water present and provide a
dry excavation until the concrete backfill is set, these can be found on our website
www.automatedenvironmentalsystems.co.uk
•
Some clean hardcore should be placed and consolidated in the base of the excavation. Usually this
will need to be around 200mm thick, but in good ground, should be a minimum of 50mm
•
In order to be protected from any external force the chamber should be completely surrounded
by concrete. The concrete surrounding the chamber should be of suitable thickness, usually a
minimum of 150mm, and quality to protect the chamber from all external pressure. Whether this is
ground pressure, groundwater pressure, trafficked areas or any other force which may cause
damage or deformation to the chamber. Therefore a qualified civil/structural engineer MUST be
consulted to specify the correct concrete backfill suitable for your specific site requirements
•
Pour the appropriate amount of concrete on top of the hardcore, minimum thickness 200mm of
CP 20Kn/mm2 strength, and then lower the chamber onto the damp concrete allowing the flanged
base joint, if fitted, to settle in, ensuring that the inlet and outlet pipes are correctly aligned
•
Note: In certain circumstances the guiderails can be supplied loose for transport (e.g. when turret
extensions are shipped detached). You must ensure that the guide rail poles are fitted to the guide
rail duck foot at the bottom of the tank and attached to the upper guide rail bracket at the top of
the access turret before concreting the tank into the ground
•
Fill the chamber with clean water to depth of approx 500mm and recheck levels. Do not overfill as
the chamber is not designed to hold water when not supported by the concrete backfill
•
Carefully commence pouring of the concrete backfill evenly around the chamber, maximum
1000mm, ensuring there are no voids which may allow ground water to penetrate. Vibrating pok-
ers should be used with care to avoid damage to the chamber. Allow 24 hours for the concrete to
harden
© Automated Environmental Systems Ltd. February 2022
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