Pinwell Installation

 

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Landfill Pipe and Construction now offer the installation of pinwells (stamp-wells). Pinwells are short (approx 4.-4.5 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. There are a number of companies installing pinwells, however Landfill Pipe and Construction have developed an improved installation method. Traditionally, the pin (circa 100mm) is pushed or hammered into the waste using the ram on a large excavator pushing against the plate on the top of the pin. 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. Two sizes of pin are used, a 1.5m pin to ‘start’ the well hole and a 5.5m pin to gain full depth. The excavator, fitted with the hydraulic breaker and the pin, simply tracks from location to location to install the wells

 

Pinwells are useful in Landfills in a number of circumstances:

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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.

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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.

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Complete gas extraction systems can be formed from pinwells.  Roxby landfill site operates 100% extraction from pinwells, with 3000m3+ total landfill gas extraction from the site!

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Pinwells can be used on the outer perimeters of the landfill site to assist in migration.

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Pinwells can augment existing deep augered wells to provide additional gas to power generation systems.

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Pinwells can be used for controlled leachate recirculation alternating with gas extraction.

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Large auger rigs are not used for installation. A tracked excavator is used, so that wells can be installed on batters etc where a drilling rig would be unable to go.

 

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Last modified: 06/08/06