Pinwell Installation
Landfill Pipe and Construction offer the installation of pin wells. Pinwells are short (approx 4-5.8 m deep) wells formed by inserting a pin into the waste, and fitting a 63mm slotted or drilled casing.
The application of pinwells has been proved over many years on many landfill sites throughout the UK.
Landfill Pipe and Construction use a larger pin (125mm) fitted onto a hydraulic breaker. Instead of using the ram to hammer the pin into the waste mass, the hydraulic breaker vibrates the pin. The pin is securely fitted to a hydraulic breaker attached to a tracked excavator. The excavator, fitted with the hydraulic breaker and the pin, simply tracks from location to location to install the wells.
Where temporary capping is installed the lower cost of pinwells can make temporary gas extraction a viable commercial prospect, reducing odour and sideways migration issues as well as contributing to power generation.
A ‘total loss’ subterranean gas extraction system on active cells can be installed. One such system has been installed at Winterton landfill site and is making a significant contribution to the gas feeding the power station on site.
Pinwells can be used on the outer perimeters of the landfill site to assist in migration. Pinwells can augment existing deep augured wells to provide additional gas to power generation systems. Pinwells can be used for controlled leachate recirculation alternating with gas extraction.
Large auger rigs are not used for installation. A tracked excavator is used, so that wells can be installed on batters where a drilling rig would be unable to go.
