Landfill Gas Pipe

Oxford Plastic manufactures landfill gas pipe and custom perforated collection pipe for the removal and collection of leachate and methane gas from sanitary landfills. Since engineers don't seem to follow a standard perforation profile, we've developed a perforator that can adapt to the any engineer's personal preference - we do up to 4" perforations in a vertical line in any profile, i.e., 2, 4, 6 & 10 o'clock pattern, and we specialize in perforating hdpe pipe from 3" to 18" diameter.

Applications: you are on the landfill page


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Whether you manage a public landfill, a waste management system or just a privately owned garbage dump, the protection of the environment is going to be your paramount concern and a heavy responsibility. Designed to hold our garbage and to prevent it from contaminating our soil and our drinking water, the modern landfill has become a highly technical and complex structure. Contrary to what many might think, a landfill is not just a pile of garbage. To comply with federal mandates, a modern landfill has become complex system of rows and layers of garbage compacted into a series of cells or lifts, all of which are enclosed by a bottom liner made from a durable synthetic plastic, and embedded with a sophisticated system of plastic pipe.

Advantages of HDPE Landfill Gas Pipe
Our polyethylene pipe is used for wastewater distribution where flexibility, corrosion resistance and durability are important considerations. Landfill conditions present unique challenges for any piping system. In a landfill, a piping system will have to withstand external loads, be highly resistance to corrosive chemicals and harsh environmental conditions. The flexibility and light weight features of polyethylene pipe make it easy to assemble and install especially where conditions are far from perfect. One of the biggest advantages of using our pipe is its promise of leak free operation. Because our landfill gas pipe can be joined by heat fusion, landfill gas can be transferred to the processing plant without any fear of leakage and harm to the surrounding environment.

As with many sanitary landfill projects, corrugated high density polyethylene pipe is used for leachate collection. Some of the pipe has to be buried beneath the landfill to divert the flow of water and resist any attack from chemicals that might leak out of the landfill. The inert properties of corrugated HDPE pipe allow it to handle strong leachate solutions ranging in pH from 1.5 to 14. The leak free pipe ensures that the landfill doesn't violate any regulations by contaminating the groundwater.

Plastic Pipe for Leachate Collection
The most important thing you can do to prevent your garbage from polluting the environment is to keep it as dry as possible. When water is allowed to seep through your garbage, it collects all the contaminants in the garbage creating something called leachate or highly acidic water. To reduce leachate, a lot of landfills will put your garbage through filters to remove any excess liquid and will install perforated plastic storm drainage pipe and storm liners to collect rainwater. These pipes collect the water and move it to the drainage ditches surrounding the landfill site which drain into a leachate collection pond From there the leachate is released to a wastewater treatment plant where it is treated and recycled back into the environment.

Plastic Pipe for Methane Extraction
Another major problem with landfills, or any collection of compressed garbage, is the production of methane gas. When your garbage is compressed there is very little room for any oxygen. When bacteria breakdowns your garbage, it creates a landfill gas, which contains mostly methane and carbon dioxide with small amounts of nitrogen and oxygen. To prevent the gas from exploding or bursting into flames, a system or series of plastic pipes are embedded within the landfill to extract the gas. In some cases, this gas is vented, burned off or the methane is extracted and used as usable energy source.

Landfill Riser Shafts
Once a leachate collection system is installed the landfill will need risers over some of these pipes for periodic maintenance. These riser shafts must have pipe continuously added to the riser as the lifts of garbage and soil cover increase in height. Flanged pipe spools are "grabbed" by the settlement of the garbage inducing vertical axial buckling of the riser pipe column. Riser shafts must be smooth on the OD to avoid vertical crushing! Vertical butt-fusion of the large diameter pipes (with its smooth OD) is virtually impossible. Hence, mechanical joining of the HDPE riser pipe is the answer!

The landfill riser system is composed of three segments: the Base, the Riser-Segment and the Cap. All these pipe components are fabricated from ruggedized HDPE pipe with at least 46 psi pipe stiffness. Each segment hand-screws into the other using two men laborers. As the garbage level rises and the riser needs to be vertically extended, the debris cap is unscrewed and removed by hand. The new Riser-Segment is hand threaded into place and the debris cap is reinstalled by hand threading it back into position. The short-length and lightweight HDPE pipe combine to make this a very practical system!

landfill riser shafts

Call for a quote on the custom base needed for your landfill; add to it all the risers segments needed, and one debris-cap; and the landfill riser shaft is complete. The end user will want its engineer to do a structural analysis to verify adequacy of pipe for burial depth.

Nominal	Custom Base	Riser Segments		Debris Cap
Size	(1.5" PL + 10ft)	5 ft long	10 ft long	(with handles)
24" ID
36" ID
42" ID

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Oxford Plastics Inc. ~ PO Box 119, Oxford Road 6, Embro, Ontario, CANADA, N0J 1J0
Office: 519.423.6232 ~ Fax: 519.423.6057 ~ Toll Free: 1.800.263.0502