Geosynthetic Pit Liners
Impermeable Geotextile Pit Liners for Power Plants
Power plants use pits, ponds, and reservoirs for a variety of water-based uses. Regardless of application, these areas must be sealed and fortified from the neighboring ecosystem, ensuring the least amount of contamination to local flora and fauna. One of the most effective containment methods uses geosynthetic liners as part of a barrier system to keep the power station as eco-friendly as possible.
GEI Works offers high-density polyethylene (HDPE) geosynthetic liners as a required component to any containment system for ponds, pits, and reservoirs at power plants. With three thicknesses available, most power station applications for pit liners are covered regardless of the liquid composition. See the item specific PDFs below:
- 20 mil Geosynthetic Liner PDF Flyer
- 24 mil Geosynthetic Liner PDF Flyer
- 40 mil Geosynthetic Liner PDF Flyer
Visit the Geomembrane Liners page for more information.
Power Station Applications for Geosynthetic Liners
Ash Ponds (Fly Ash/CCRs) – Ash ponds, also known as surface impoundments, are created for the wet method disposal of fly ash – waste from a nearby combustion power plant. A ring embankment encloses the ash pond site, and a geomembrane liner keeps contaminants from leeching into the surrounding environment. Ash slurry is pumped into the surface impoundment and the water portion given time to evaporate. Now the ash is transported to a landfill or other permanent disposal site, so the ash pond can be reused.
GEI Works provides 40 mil HDPE geosynthetic liners with excellent tensile, seam, and tear strength. These features help prevent any rips or tears in the liner of ash pond, keeping the surrounding soil safe from contamination. Impermeable geotextile pit liners are thermally bonded and tested for seam integrity before installation.
Cooling Ponds – The cooling water system in a power plant generally contains at least one cooling pond. A steam-cycle power plant uses these ponds to remove and dissipate excess heat from the steam circuit. Once the water has cooled to an acceptable temperature, it is once again pumped through the system as a cooling agent.
Cooling ponds need to be lined with a durable impermeable geotextile to prevent heated water from releasing into the environment and upsetting the balance of the nearby ecosystem. Geosynthetic liners from GEI Works have a heat threshold of 180°F, so they can handle water temperatures close to the boiling point. Multiple thicknesses are available for any type of soil and geographic situation around the steam-cycle power plant.
Pumped-Storage Reservoirs – A pumped-storage power plant uses water moved between two reservoirs to generate electricity. When electrical use is low, pumps transfer water from the lower pond to the upper reservoir using excess power. During high demand time periods, the stored water rushes through power turbines to the bottom reservoir, creating electricity. The pumped-storage power plant uses the same water each cycle, saving on both fuel and operating costs.
Both the upper and lower pumped-storage ponds require strong geosynthetic liners to ensure proper water storage during and between cycles. The geomembrane liner keeps water secure, stopping any leaks or seepage before they happen, and its strong hydrostatic resistance easily handles water movement. The lifespan of the impermeable geotextile is measured in years, and it's easily repaired in case of a tear or puncture.
Accessories for Pit Liners
Oil Spill Containment Valve – When pumping water to and from a reservoir, oil contamination is a possibility. To keep oil from entering a water discharge pipe, GEI offers the oil spill containment valve, which seals the pipe before oil can escape. The only moving part of the valve is a ballasted float working entirely based on the specific gravities of water and oil. As oil gets in the system, The float falls and seals the pipe before any reaches the outlet. The oil spill containment valve and any other pipes are sealed on-site to work in conjunction with geosynthetic liners to secure the reservoir.
Water Baffles – When combustion power stations use ash ponds, regulating even slurry flow into the surface impoundments is critical for maximizing pond space. Water baffles guide the flow throughout the entire ash pond, so all areas receive a similar amount of slurry. More liquid can be processed and contained before needing to be removed for permanent disposal.
See our entire variety of liners on the Secondary Containment Liner page.