SIGMA Pipe Restraint Products Featured in Exciting Drone Video


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SIGMA Corporation is proud to announce our involvement in the development of the Nation’s largest pipe restraint installation in Edmond, Oklahoma. This $171 million water resource recovery facility (WRRF) project broke ground in September of 2017 and expanded the overall capacity of the facility to twelve million gallons per day, and was completed in October 2020.

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.

As the leading supplier of pipe restraint products to the U.S. waterworks industry, SIGMA provided a broad selection of pipe restraints for both PVC and ductile iron from 8″ to the very largest 54 and 60″ for mechanical joint assemblies and pipe to pipe connections.

Pipe Restraint Products were supplied by Ferguson Waterworks, and SIGMA’s novel re-rounding feature was used onsite to ensure proper restrained joint assembly at time of installation. By using this re-rounding feature, the installer can bring a ductile iron pipe to a near round, thereby enabling the spigot end of the pipe to fit into the mechanical joint fitting bell or a pipe bell.

Oscar Renda Contracting worked with SIGMA throughout the process to successfully install the restraints, which proved to be a straightforward process, noted Steve McDonald, SIGMA’s pipe restraint product manager. Steve went on to say that the construction team was extremely professional. In advance of the installation our SIGMA team was part of a jobsite preconstruction meeting, with Oscar Renda Contracting , where we provided detailed instructions for a successful installation.  “Oscar Renda worked collaboratively with SIGMA and knew exactly what they were doing. It’s a testament to their expertise that the project went so smoothly.”

SIGMA Zinc Fittings Ensure Longevity of Installation at “Hot Zone” Site

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 SIGMA-Zinc exterior coating (TNEMEC 90-98). SIGMA-Zinc 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.

About Southland Holdings

Southland Holdings is one of the largest, most diversified industry leaders in heavy civil construction. As a privately held organization, the family of Southland companies is active in 38 U.S. states and three provinces in Canada. With a proven track record, Southland has successfully constructed over 4,000 projects, generated $34 billion in total revenue and employs more than 3,000 dedicated full-time employees.

For further information about SIGMA’s pipe restraint product line, please contact Steve McDonald smcdonald@sigmaco.comTo learn more about Southland Holdings, contact Rachel Sackett