02
1 INTRODUCTION
1.1 These guidelines represent Best Practice for the installation of the above units. Many years of specialist
experience has led to the successful installation of thousands of units, it must be noted, however, that
these Guidelines are necessarily of a general nature. It is the responsibility of others to verify that they are
appropriate for the specific ground conditions and in-service loads of each installation. Similarly, a qualified
specialist (e.g. Civil engineering consultant) must verify any information or advice given by our employees or
agents regarding the design of an installation.
1.2 The unit is designed to be installed underground, as a minimum on a concrete slab with a concrete
backfill - unless the height of the water table means that additional hold down straps are required.
2 HANDLING & STORAGE
2.1. Care must be taken to ensure that units are not damaged during delivery and handling on site.
2.2 The design requirements of our products will frequently mean that the centre of gravity of the unit is “offset”.
Care must therefore be taken to ensure that the unit is stable when lifting. Rainwater may also collect inside
units, particularly if they have been stored on site prior to installation, adding weight and increasing instability.
Check units before lifting and pump out any excess water.
2.3 When lifting units, use webbing slings of a suitable specification. DO NOT USE CHAINS.
2.4 A suitable spreader bar should be used to ensure that units are stable and that loads are evenly distributed
during lifting. When lifting units, a spreader bar should be used where the slings would otherwise be at an
angle > 30 degrees to the vertical.
2.5 Lifting equipment should be selected by taking into account the unit weight, length and the distance of lift
required on site.
2.6 We accept no responsibility for the selection of lifting equipment.
2.7 Whenever our units are stored or moved on site, ensure that the storage location is free of rock, debris and
any sharp objects, which may damage the unit. The units must be placed on ground, which is flat and level
to evenly support the base of the unit. Do not roll units.
3 TANK INSTALLATION – (CIVIL WORK)
3.1 SITING
3.1.1 Where possible, take advantage of any gradient across a site to minimize the invert depth at the tank inlet, as
this will reduce excavation. For frost protection a minimum invert depth of 500mm is recommended.
3.1.2 Avoid siting tanks in ground with a large gradient directly around the proposed position, as this can cause
excessive ground pressure on the tank.
3.1.3 Our tanks are not designed to accept any traffic loads. A minimum traffic clearance of 2 metres must be
provided. If this is not possible the tank must be protected from superimposed loads, e.g. by a reinforced
concrete surround and provided with an appropriate cover, which must not bear on the structure of the tank.
Please contact and consultant civil engineer.
3.2 BEFORE INSTALLING YOUR TANK
3.2.1 Ensure Building Regulation approval.
3.2.2 Ensure ground porosity is suitable.
3.2.3 Inspect tank for damage before installation. Our tanks have been fully tested before despatch from our factory.
Once the tank has been installed, we cannot accept claims for damage.
3.2.4 Check that you have the correct invert drain depth (neck height) of tank. A label indicates
the maximum permissible depth.
3.2.5 Check orientation and heights of inlet and outlets against drawings at the end of this manual.
3.2.6 The tank is supplied with a standard invert of 500 mm (allowing 75 mm for a manhole cover) from the top
of the inlet pipe.
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