SIGMA Zinc Fittings Ensure Longevity of Installation at “Hot Zone” Site in Edmond, Oklahoma

SIGMA Corporation is proud to announce our involvement in the development of the Nation’s largest pipe restraint installation. This $171 million water resource recovery facility (WRRF) project broke ground in September of 2017 and expanded the overall capacity of the facility to 12 million gallons per day.

SIGMA’s large-sized pipe restraint products were selected by the City as part of a three-year construction project to expand their existing WRRF, preparing for the future growth of the area.  For the construction of the project, Oscar Renda Contracting (a Southland Holdings Company) was selected by the City as the General Contractor, and worked collaboratively with SIGMA and the City on this unique installation.

The area around the wastewater treatment plant is known for its red dirt, which includes a high percentage of red clay. This type of soil is also found in parts of Colorado and Texas and is known as the “hot soil zone.” When wet, the ground becomes extremely muddy. For this reason, the City chose to use mechanical joint fittings with a cement interior lining and SIGMAZinc exterior coating (TNEMEC 90-98). SIGMAZinc was chosen in this instance because it is easier to repair in the field than conventional zinc coating. C110 cement lined flange fittings used on site used a TNEMEC 140-1211 exterior coating.

For further information about this and other SIGMA Pipe Restraint Products, contact Steve McDonald,