Sioux Falls, SD
WLA understands the complexities of working in water and wastewater treatment plant environments where coordination with staff and careful research of the plant’s construction is necessary.  WLA was tasked with the design of the new digester gas piping system for the City of Sioux Falls, South Dakota wastewater treatment plant.

The City was experiencing leakage in the original iron 60,000 cubic foot sphere piping system that carries digester gas to and from the sphere.  WLA was responsible for designing the new piping system,  constructed primarily from high-density polyethylene (HDPE). The new system uses all thermal fusion welded joints, which will hold gas to over 250 pounds per square inch (psi). The corrosion resistance and flexibility of the piping system will ensure a system capable of lasting for years. In addition, the HDPE system allowed the contractor to place the piping using either direction drilling or open cut methods, depending on which economy prove more cost-effective for a particular portion of the total length.