General Installation Guide for

Recommended for use with

GT Range

GFT Range

• Your (unit/unit's) will be delivered adjacent to the nearest hard standing area where the contractor/end user must take responsibility for offloading. Care must be taken to ensure that units are not damaged during delivery and handling on site.
• Should the unit be damaged during offloading then this should be reported immediately. Do not install a damaged tank without having first consulted the supplier or ourselves for further advice. Remedial repairs prior to installation may be possible if prior notice is given and it is deemed to be mutually cost effective.

• Although very robust, care should be taken in storage and movement of the unit on site, ensure that the storage location surface is free of sharp objects which may damage the base of the unit.

  Throughout the installation please ensure that the unit is not subjected to impact or contact with sharp edges, particularly the base.

• Your unit is manufactured from High Density and Medium Density Polyethylene, which is a very robust material. However please do not use sharp objects or use pinch bars or other implements that may create a point load against the body of the unit when moving or setting the tank.

Minimum 100mm level sand or concrete base Hardcore where required.

1. In areas where the water table is above the bottom of the excavation and/or theexcavation is liable to flooding, the excavation should be dewatered using suitable pumping equipment.

2. Form a pump well in one corner of the excavation and ensure that the ground dewatering should continue until the installation is complete with the concrete having reached initial set and sufficient to prevent and ground water creating voids in the concrete surround.

Please Note :

The installation advice offered in this document is a guide only. We do not accept any responsibility for concrete surround or installation. This must be determined by a qualified engineer, taking into account the prevailing site conditions, potential imposed loads, buoyancy etc. Failure to adhere to the principals outlined in this installation guide however may invalidate any warranty on the unit.

Stage 1.                                                                                                                                          Lay a minimum 100mm base of concrete. During this stage care should be taken to ensure that the bottom of the unit is uniformly supported so that point loads to the base are avoided. Connect the incoming and outgoing pipe work preferably using standard upvc couplings. Please ensure all the units are connected properly and have correct levels, ensure no negative falls are in the system before connection to inlet and outlet pipes.

Stage 2.                                                                                                                                             Ensure there is an adequate water supply available. It is recommended that the unit is at least half filled with water for ballast and to stop the unit floating. Then pour concrete around the sides of the tank with a minimum 100mm of concrete around the unit making sure that concrete is packed into the ribs. This will take you to just below the pipework . Do not use vibrating pokers to consolidate the concrete.

Stage 3.                                                                                                                                               Should one of our extensions be fitted to accommodate extended invert. This also should be backfilled with concrete as detailed above. Please note extensions can only be supplied to 1000mm in line with Building Regulations and Health and Safety. Deeper inverts should be accommodated by use of our Access Chambers (Please ask for more details if you are unsure)

Stage 4.

It is important to check the unit has been filled (PRIMED) with reasonably clean

water up to the bottom invert or waterline of the outlet pipe. This is the units normal water level when at rest. Check all pipe connections are clear from obstructions.

Please note : Grease Traps should not be installed in trafficked situations and in accordance to BSen1825 should ideally be installed in a compounded area with suitable free access for cleaning/maintenance.

Specification References:

Concrete : 20n/mm2, 20mm aggregate – 30mm to 50mm slump mix or 35n/mm²

Polythene membrane : 500 gauge building quality dpm.

4. Installation

Dewatering an Excavation

2 . Handling